Sanyo Optec Design Co., Ltd. Patent applications |
Patent application number | Title | Published |
20130121126 | OPTICAL ELEMENT HOLDER, OPTICAL ELEMENT UNIT, AND OPTICAL PICKUP APPARATUS - A holder has walls defining a holding region for holding an optical element, and has a protrusion part overlapping the holding region. The protrusion part is formed at a deformable support part, and can be displaced in a direction away from the holding region by deformation of the support part. When the optical element is fitted into the holding region, the support part deforms and the protrusion part runs on a side surface of the optical element. In this state, the optical element is pressed until a back surface of the optical element abuts a support surface of the holder. The optical element is pressed against the wall and positioned by a return force of the support part. | 05-16-2013 |
20130119118 | METHOD FOR MANUFACTURING SEMICONDUCTOR LASER APPARATUS, SEMICONDUCTOR LASER APPARATUS, AND OPTICAL APPARATUS - This method for manufacturing a semiconductor laser apparatus includes steps of forming a first semiconductor laser device having a first electrode, forming a second semiconductor laser device having a second electrode, forming a first solder layer with a first melting point through a first barrier layer on a third electrode, forming a second solder layer with a second melting point through a second barrier layer on a fourth electrode, bonding the first electrode to the third electrode through a first reaction solder layer, a melting point of which rises to a third melting point higher than the second melting point by reacting the first electrode with the first solder layer, and bonding the second electrode to the fourth electrode by applying heat of a first heating temperature to melt the second solder layer with the second melting point after the step of bonding the first electrode to the third electrode. | 05-16-2013 |
20130083643 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus including a photodetector including first to fourth quadrant light-receiving portions, a first generating unit configured to generate a focus error signal based on respective signals from the first to fourth light-receiving portions, a second generating unit configured to generate a tracking error signal based on respective signals from the first to fourth light-receiving portions, first to fourth low-pass filters configured to allow respective signals to be input thereto from the first to fourth light-receiving portions, a third generating unit configured to generate a first correction signal for correcting the focus error signal by performing subtraction on an addition signal obtained by adding respective signals from the first and fourth low-pass filters, and an addition signal obtained by adding respective signals from the second and third low-pass filters, and a correction unit configured to correct the focus error signal based on the first correction signal. | 04-04-2013 |
20130039161 | OPTICAL ELEMENT RETAINING DEVICE, OPTICAL ELEMENT TRANSFER DEVICE AND OPTICAL PICKUP DEVICE - An element holding device of the present invention includes: a guide portion engaging with a guide shaft; a lens fixing portion on which to fix a collimator lens; an arm portion; an insertion portion having a hole portion in which to insert a guide shaft; a wire fixing portion made by protruding a side surface of the insertion portion in a −Y direction; and a wire fixed on the wire fixing portion. A bent portion being a leading end portion of the wire is housed in a slit. Thereby, excess deformation of a contact portion is suppressed. | 02-14-2013 |
20130021893 | Optical Pickup Apparatus - An optical-pickup apparatus configured to prevent noise caused by return light by superposing a high-frequency signal, generated from a high-frequency signal generation circuit, on a driving signal to be supplied to a laser diode, the optical-pickup apparatus includes: a high-frequency superimposition integrated circuit including the high-frequency signal generation circuit; first wiring connected between an anode of the laser diode and the high-frequency superimposition integrated circuit; and second wiring connected between a cathode of the laser diode and the high-frequency-superimposition integrated circuit, the laser diode and the high-frequency superimposition integrated circuit mounted on a circuit board, the first wiring and the second wiring arranged, for the most part, in a region where the laser diode is arranged, the second wiring configured to pass through between an anode terminal of the laser diode and an anode terminal of a monitor diode. | 01-24-2013 |
20120314555 | LENS, LENS MOUNTING METHOD AND OPTICAL PICKUP DEVICE - A lens includes a lens portion which condenses light; a reflecting flat portion which is formed in a periphery of the lens portion and reflects parallel light to be irradiated to the reflecting flat portion in a direction opposite to the irradiation direction; and a flange portion which is adhered to a lens holder by an adhesive. An applied portion of the adhesive which is formed on the flange portion is inclined with respect to the reflecting flat portion. | 12-13-2012 |
20120275289 | LIGHT EMITTING DEVICE, OPTICAL PICKUP APPARATUS AND METHOD FOR MANUFACTURING THE SAME - In the present invention, to improve CD read/write characteristics having poor image height characteristics, a third light emitting source emitting a third laser beam for CD is disposed on an optical axis of an objective lens. Thereby, the third laser beam emitted from the third light emitting source travels along the optical axis of the objective lens, thus generating no coma aberration in the third laser beam. Furthermore, in the present invention, a second light emitting source emitting a second laser beam for DVD and a first light emitting source emitting a first laser beam for BD are disposed across the third light emitting source. Thereby the phase propagation directions of coma aberrations in the first and second laser beams coincide with each other. Adjustment of the coma aberration in one of the laser beams enables the coma aberration in the other laser beam to be adjusted. | 11-01-2012 |
20120201109 | Optical Pickup Apparatus - An optical-pickup apparatus includes: a diffraction grating that a laser beam enters, the diffraction grating being configured to generate a main beam that is 0th-order light and sub-beams that are +1st-order diffracted light and −1st-order diffracted light; an objective lens to focus the main and sub-beams onto a signal-recording layer; a main-beam light-receiving portion that the main beam reflected by the signal-recording layer is applied to; and sub-beam light-receiving portions that the sub-beams reflected by the signal-recording layer are respectively applied to, each light-receiving area of the sub-beam light-receiving portions being smaller than a light-receiving area of the main-beam light-receiving portion, wherein a focusing-control operation is performed by a differential astigmatic method using the main beam applied to the main-beam light-receiving portion and the sub-beams respectively applied to the sub-beam light-receiving portions. | 08-09-2012 |
20120195181 | OBJECTIVE LENS, OPTICAL PICKUP APPARATUS USING THE SAME, AND METHOD FOR MANUFACTURING OBJECTIVE LENS - Provided is an objective lens manufactured well by using a mold and an optical pickup apparatus including the same. The objective lens of the present invention includes a first region that focuses laser beams of a BD, DVD, and CD standards, a second region that focuses the laser beams of the DVD and CD standards, and a third region that focuses the laser beams of the BD and the DVD standards are provided in this order from a center portion of the objective lens. A first annular zone step provided in the first region has a step amount larger than step amounts of annular zone steps provided in other regions. | 08-02-2012 |
20120195180 | OPTICAL PICKUP APPARATUS - An optical-pickup apparatus includes: a single-wavelength-laser diode to emit a first-laser beam; a two-wavelength-laser diode to emit second- and third-laser beams; an objective lens; a photodetector to be irradiated with first- to third-reflected-light beams of the first- to third-laser beams reflected from the signal-recording layers of first- to third-optical discs; an aberration-correcting plate to guide the second- and third-laser beams toward the lens, and correct astigmatism of the reflected-light beams, and guide the astigmatism-corrected-reflected-light beams toward the photodetector; a semitransparent mirror to guide, toward the lens, the first-laser beam and the second- and third-laser beams having been guided by the aberration-correcting plate, and guide the reflected-light beams toward the aberration-correcting plate; a quarter-wave plate to convert the first- to third-laser beams from linearly-polarized light into circularly-polarized light, and convert the reflected-light beams from circularly-polarized light into linearly-polarized light; and a divergent lens to correct aberration caused by the mirror. | 08-02-2012 |
20120188672 | PRINTED WIRING BOARD - A printed wiring board includes: a first-electrostatic-discharge-protecting pattern having a first anode pattern electrically connect to an anode of a laser diode and a first cathode pattern arranged to oppose the first anode pattern and electrically connect to a cathode of the laser diode; and a second-electrostatic-discharge-protecting pattern having a second anode pattern electrically connect to the anode of the laser diode and a second cathode pattern arranged to oppose the second anode pattern and electrically connect to the cathode of the laser diode, wherein the first-electrostatic-discharge-protecting pattern has a first soldering area at which solder is melted by a soldering iron such that the first anode and cathode patterns are short-circuited or short-circuit-released, and the second-electrostatic-discharge-protecting pattern has a second soldering area at which the solder is melted by a reflow such that the second anode and cathode patterns are short-circuited or short-circuit-released. | 07-26-2012 |
20120182847 | OBJECTIVE LENS AND OPTICAL PICK-UP DEVICE USING THE SAME - Provided is an objective lens that allows securing of a long working distance for a laser beam with a long wavelength and has a predetermined thickness or larger, and an optical pickup apparatus including the objective lens. In an objective lens of the present invention, a first region that focuses laser beams of a BD, DVD, and CD standards, a second region that focuses the laser beams of the DVD and CD standards, and a third region that focuses the laser beams of the BD and the DVD standards are provided in this order from a center portion of the objective lens. An optical super resolution with the laser beam of the BD standard is achieved by preventing a portion of the laser beam of the BD standard transmitted through the second region from contributing to spot formation. | 07-19-2012 |
20120170441 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus includes an objective lens having a numeric aperture and an incident face. An antireflection coating is formed on the incident face. A collimating lens converts laser light from a laser diode into parallel light, and causes the parallel light to be made incident on the incident face through the antireflection coating. The thickness of the antireflection coating causes a transmittance of laser light that enters the objective lens to be: set at a first predetermined transmittance value, when the numeric aperture is between zero and a first predetermined numeric aperture value; set to correlate linearly with the numeric aperture when the numeric aperture is between the first predetermined numeric aperture value and a second predetermined numeric aperture value; and set at a second predetermined transmittance value, when the numeric aperture is between the second predetermined numeric aperture value and a third predetermined numeric aperture value. | 07-05-2012 |
20120134255 | OBJECTIVE LENS AND OPTICAL PICKUP APPARATUS USING THE SAME - Disclosed is an objective lens that favorably focuses multiple laser beams having different wavelengths on information recording layers of optical discs, and an optical pickup apparatus including the lens. The objective lens of the invention is provided with a first region for focusing laser beams of the BD, DVD and CD standards. The first region is provided with an annular zone step having a height calculated on the basis of a wavelength of the laser beam of the BD standard, and thus causes chromatic aberration of the laser beam of the DVD standard. This chromatic aberration corrects spherical aberration occurring due to a difference in thickness between coating layers of optical discs. In the invention, the curve surface shape of the first region is adjusted so that the BD and DVD standards can share the aberration for reducing the aberration of the laser beam of the DVD standard. | 05-31-2012 |
20120120532 | PRINTED WIRING BOARD - A printed wiring board includes: an anode pattern electrically connected to an anode of a laser diode; and a cathode pattern arranged to oppose the anode pattern and electrically connected to a cathode of the laser diode, the anode pattern and the cathode pattern being in shapes having such parts that a distance between the anode pattern and the cathode pattern opposed to each other is a first distance, and such parts that a distance between the anode pattern and the cathode pattern opposed to each other is a second distance shorter than the first distance, at least such parts that the distance between the anode pattern and the cathode pattern opposed to each other is the second distance being short-circuited by solder in a case where the laser diode is protected from an electrostatic discharge. | 05-17-2012 |
20120106584 | SEMICONDUCTOR LASER APPARATUS AND OPTICAL APPARATUS - This semiconductor laser apparatus includes a base, a plurality of electrodes arranged along a first direction on an upper surface of the base, a plurality of semiconductor laser devices bonded to respective upper surfaces of the plurality of electrodes, emitting laser beams in a second direction, and a photodetector having a photosensitive surface arranged in a region of the base in a third direction relative to the plurality of semiconductor laser devices. An electrode arranged in a position other than end portions in the first direction and a fourth direction, of the plurality of electrodes has an extraction wiring portion arranged on the photosensitive surface of the photodetector. | 05-03-2012 |
20120093185 | METHOD FOR MANUFACTURING SEMICONDUCTOR LASER APPARATUS, SEMICONDUCTOR LASER APPARATUS, AND OPTICAL APPARATUS - This method for manufacturing a semiconductor laser apparatus includes steps of forming a first semiconductor laser device having a first electrode, forming a second semiconductor laser device having a second electrode, forming a first solder layer with a first melting point through a first barrier layer on a third electrode, forming a second solder layer with a second melting point through a second barrier layer on a fourth electrode, bonding the first electrode to the third electrode through a first reaction solder layer, a melting point of which rises to a third melting point higher than the second melting point by reacting the first electrode with the first solder layer, and bonding the second electrode to the fourth electrode by applying heat of a first heating temperature to melt the second solder layer with the second melting point after the step of bonding the first electrode to the third electrode. | 04-19-2012 |
20120069724 | OPTICAL PICKUP APPARATUS - An optical-pickup apparatus includes: a laser diode; an objective lens; a diffraction grating; a photodetector including main-beam-, first-sub-beam-, and second-sub-beam-light-receiving portions; a quarter-wave plate having either a second area allowing a reflected-laser beam to pass therethrough without polarization or a third area allowing the reflected beam to pass therethrough at a polarization angle different from that of the first area; and a polarizing member having a separate-light-amount ratio set therefor with respect to the reflected beams passing through the second or third area and an area excluding the second or third area from the first area, such that proportions of the reflected beams passing therethrough toward the photodetector are different, thereby decreasing an irradiation level when the first- and second-sub-beam-light-receiving portions are irradiated, as stray light, with the reflected beam reflected from either one, not subjected to a signal-reading operation, of the first- and second-signal-recording layers of an optical disc. | 03-22-2012 |
20120044965 | SEMICONDUCTOR LASER APPARATUS AND OPTICAL APPARATUS - This semiconductor laser apparatus includes a base having a step portion, a first upper surface on a lower side of the step portion and a second upper surface on an upper side of the step portion, a first semiconductor laser device bonded onto the first upper surface, having a first light-emitting region on an upper side thereof, and a second semiconductor laser device bonded onto the second upper surface, having a second light-emitting region on a lower side thereof. The first light-emitting region is located above the second upper surface in a state where the base is horizontally arranged. | 02-23-2012 |
20120026859 | Optical Pickup Apparatus - An optical-pickup apparatus includes: a laser diode having a first-laser element, which emits a first-laser beam, and a second-laser element, which emits a second-laser beam having a wavelength shorter than a wavelength of the first-laser beam, arranged in the same package; an objective lens to condense the first- and second-laser beams emitted from the laser diode to signal-recording layers of first- and second-optical discs, respectively, the second-optical disc being of a standard different from a standard of the first-optical disc; and a collimating lens arranged in an optical path between the laser diode and the objective lens, the collimating lens configured to change the first- and second-laser beams from divergent light to parallel light, the collimating lens being inclined with respect to optical axes of the first- and second-laser beams so that astigmatism in the first- and second-laser beams is corrected. | 02-02-2012 |
20110255392 | OPTICAL PICKUP DEVICE - A semiconductor laser emits infrared laser light for CD and red laser light for DVD. A collimator lens and a CD/DVD objective lens have optical axes thereof aligned with an optical axis of the infrared laser light. The CD/DVD objective lens is mounted on a holder to be inclined in such a direction as to suppress inherent coma aberration of the CD/DVD objective lens, and to suppress astigmatism generated in the red laser light from a state in parallel to a reference plane of the holder. | 10-20-2011 |
20110249545 | Objective Lens and Optical Pickup Apparatus - An objective lens includes: a diffraction area having a diffraction structure provided thereon concentrically around an optical axis of the objective lens; and a first non-diffraction area provided outward an outer circumference of the diffraction area, the objective lens being configured to focus first laser light on a signal recording surface of a first optical recording medium by refraction in the first non-diffraction area; focus second laser light, different in wavelength from the first laser light, on a signal recording surface of a second optical recording medium by diffraction in the diffraction area; and focus third laser light, different in wavelength from the first laser light and the second laser light, on a signal recording surface of a third optical recording medium by diffraction in the diffraction area. | 10-13-2011 |
20110235497 | OPTICAL PICKUP DEVICE - The aberration takes place according to the height of the image because the laser light tilts from the optical axis when it enters to the object lens in the optical pickup device which is equipped with a laser diode for BD and the monolithic laser diode capable of irradiating laser lights with two different wavelengths for DVD and CD as one package to read the signal by single object lens and single optical system. This is because the light sources of the three lights with different wavelengths are away from each other in the optical pickup device. The emission point of the laser diode for BD is formed at the location shifted from the center of the chip. The laser diode for BD is disposed adjacent to the monolithic laser diode capable of irradiating laser lights with two wavelengths for DVD and CD to make the emission point closer to the monolithic laser diode. The sizes of these two laser diodes is minimized by employing half dicing during the cleavage processing for separating the chips. Therefore, the distance among the emission points can be reduced even with the configuration where two laser diodes are disposed on the substrate in lateral. | 09-29-2011 |
20110235494 | Optical Pickup Apparatus - An optical pickup apparatus includes: a laser diode configured to generate a laser beam; and an objective lens having an annular diffraction zone formed on an incident surface thereof on which the laser beam is incident, the annular diffraction zone being a zone configured to focus the laser beam on each of signal recording layers of first to third optical discs so that a signal recorded in each of the signal recording layers of the first to third optical discs are read, the first optical disc having the signal recording layer at a first distance from a surface thereof, the second optical disc having the signal recording layer at a second distance longer than the first distance from a surface thereof, the third optical disc having the signal recording layer at a third distance longer than the first distance and shorter than the second distance from a surface thereof. | 09-29-2011 |
20110222389 | LASER CONVERGING APPARATUS, OPTICAL PICKUP DEVICE, AND OPTICAL DISC RECORDING/REPRODUCING APPARATUS - A laser converging apparatus includes a polarizing hologram element having a first area defined by a numerical aperture corresponding to a thickness of a first protective layer of a first disk medium and a second area inside the first area, the second area defined by a numerical aperture corresponding to a thickness of a second protective layer (>the thickness of the first protective layer) of a second disk medium. A wavelength selecting nonpolarizing hologram element has a third area defined by a numerical aperture corresponding to a thickness of a third protective layer (>the thickness of the first protective layer) of a third disk medium. The laser converging apparatus also includes an objective lens having the numerical aperture corresponding to the thickness of the first protective layer, and a holder that holds the polarizing hologram element, the nonpolarizing hologram element, and the objective lens. | 09-15-2011 |
20110214137 | LENS HOLDER AND OPTICAL PICKUP APPARATUS USING THE SAME - Provided is a lens holder comprising: a mounting hole into which a condenser lens part of the objective lens is to be inserted; a peripheral part which surrounds the mounting hole and on which a flange part of the objective lens is to be mounted; and three protrusions provided in the peripheral part to be spaced apart from each other and to protrude higher than a main surface of the peripheral part. Also provided is an optical pickup apparatus comprising the lens holder and an objective lens supported with a condenser lens part inserted into the mounting hole of the lens holder, and with the flange part being in contact with the three protrusions. | 09-01-2011 |
20110211435 | LASER ATTACHMENT DEVICE AND OPTICAL PICK-UP DEVICE USING THE SAME - A laser attachment device of the present invention is formed of a LD package and a LD holder housing it. A first inner wall of the LD holder to come into contact with a side surface of the LD package is an inclined surface. This allows the facing direction of the LD package to be corrected by the first inner wall being the inclined surface, even when a laser beam emitted from a light emitting chip housed in the LD holder is inclined with respect to an optical axis. Thus, the traveling direction of the laser beam is corrected to the optical axis side. | 09-01-2011 |
20110209164 | Optical Pickup Apparatus and Manufacturing Method of Optical Pickup Apparatus - An optical-pickup apparatus includes: a first-objective lens; a second-objective lens; a lens holder including a first-lens barrel having the first-objective lens mounted on an end face thereof and a second-lens barrel having the second-objective lens mounted on an end face thereof; an actuator unit having the lens holder mounted thereon; and a housing having the actuator unit mounted thereon, the first and second objective lenses each being mounted on the lens holder such that a direction, in which wavefront of coma aberration on each lens face is most advanced in phase, is aligned with a radial direction of an information-recording medium, the actuator unit being mounted on the housing such that an optical axis of the first-objective lens is inclined in the radial direction at an inclination angle of the axis toward a recording surface of the medium required to cancel coma aberration of the first-objective lens to the surface. | 08-25-2011 |
20110205879 | OPTICAL PICK-UP DEVICE AND METHOD FOR MANUFACTURING THE SAME - Provided are an optical pick-up device which can appropriately correct an optical path of a laser beam emitted from a light-emitting chip arranged with a mounting error, and a method of manufacturing the same. An optical pick-up device includes: a first light-emitting chip and a second light-emitting chip which emit laser beams having predetermined wavelengths; a PDIC which receives the laser beams emitted from the first and the second light-emitting chips; and a first optical correction component and a second optical correction component provided between the PDIC and the light-emitting chips. The first and the second optical correction components incline a first laser beam by diffraction, while transmitting a second laser beam and a third laser beam without inclining these beams. With the diffraction of the first laser beam by these two correction components, the optical path of the first laser beam is corrected to a predetermined position. | 08-25-2011 |
20110199886 | Optical Pickup Apparatus - An optical pickup apparatus includes: a circuit board; a laser diode mounted on one face of the circuit board; and a high-frequency superimposition integrated circuit arranged on the other face of the circuit board, the high-frequency superimposition integrated circuit including a high-frequency signal generation circuit, the circuit board having an area greater than or equal to an area occupied by a lead pin of the laser diode and a region smaller than or equal to twice a region where the laser diode is mounted, a high-frequency signal generated from the high-frequency signal generation circuit being superimposed on a driving signal to be supplied to the laser diode, in order to take a measure against noise caused by return light of the laser diode. | 08-18-2011 |
20110191794 | OPTICAL PICKUP APPARATUS - An optical-pickup apparatus includes first and second objective lenses that focus first and second laser light on information-recording layers of first and second optical discs, the second optical disc having an information-recording format different from that of the first optical disc; and a lens holder that integrally holds the first and second objective lenses in an adjacent manner, a disc surface of the first optical disc and of the second optical disc being substantially parallel to confronting faces of the first and second objective lenses, that confront the disc surface, a minimum distance between the disc surface and the confronting faces in a direction of an optical axis of the turntable being greater than a thickness of the turntable in a direction of a rotation axis of the turntable, either one or both of the first and second objective lenses configured to focus bluish-violet laser light on an optical disc. | 08-04-2011 |
20110182167 | OPTICAL PICKUP DEVICE AND METHOD FOR MANUFACTURING THE SAME - An optical pickup device comprises a first objective lens fixed on a lens holder and configured to focus a first laser beam on a signal recording layer provided in an optical disc, the lens holder supported by support wires so that the lens holder is movable toward a signal surface of an optical disc and in a radial direction of the optical disc, and a second objective lens fixed on the lens holder and configured to focus a second laser beam on a signal recording layer provided in an optical disc. Bearing surfaces of the first and second objective lenses are tilted at predetermined angles, respectively, generation directions of coma aberrations by the first and second objective lenses are broadly divided by a simple method, and the objective lenses are fixed with the directions of the coma aberrations aligned. | 07-28-2011 |
20110170396 | LIGHT EMITTING DEVICE, OPTICAL PICKUP APPARATUS AND METHOD FOR MANUFACTURING THE SAME - In the present invention, to improve CD read/write characteristics having poor image height characteristics, a third light emitting source emitting a third laser beam for CD is disposed on an optical axis of an objective lens. Thereby, the third laser beam emitted from the third light emitting source travels along the optical axis of the objective lens, thus generating no coma aberration in the third laser beam. Furthermore, in the present invention, a second light emitting source emitting a second laser beam for DVD and a first light emitting source emitting a first laser beam for BD are disposed across the third light emitting source. Thereby the phase propagation directions of coma aberrations in the first and second laser beams coincide with each other. Adjustment of the coma aberration in one of the laser beams enables the coma aberration in the other laser beam to be adjusted. | 07-14-2011 |
20110149709 | Optical Pickup Apparatus - An optical-pickup apparatus includes: a three-wavelength-laser diode including first-, second-, and third-laser elements to emit first-, second-, and third laser beams having first, second, and third wavelengths, respectively, the three laser elements housed in the same case; an objective lens to focus the three laser beams onto first- to third-optical-disc-signal-recording layers, respectively; a first photodetector to be irradiated with first-return light reflected from the first-optical-disc-signal-recording layer, a second photodetector to be irradiated with second- and third-return lights respectively reflected from the second- and third-optical-disc-signal-recording layers; a polarizing-beam splitter to reflect the three laser beams toward the lens, and allow the three return lights having passed through the lens to pass therethrough; a semitransparent mirror on which the three return lights having passed through the polarizing-beam splitter are incident, and which guide the first-return light toward the first photodetector and the second- and third-return lights toward the second photodetector. | 06-23-2011 |
20110122514 | LENS FIXING DEVICE AND OPTICAL PICKUP DEVICE - A lens fixing device includes a lens holder having a lens (lens area) made of a resin, and a mounting portion. The lens holder has two projections. Each of the two projections is formed with a guide surface and a mounted surface. A line of intersection of an extension of the guide surface of the projections and an extension of the mounted surface of the projections in a plane direction is aligned with an optical axis of the lens area. The lens holder is positioned with respect to a plane direction orthogonal to the optical axis by contact of the guide surfaces with receiving surfaces of the mounting portion. The lens holder is fixedly attached by an adhesive. | 05-26-2011 |
20110116354 | Optical Pickup Apparatus - An optical pickup apparatus includes: a laser diode configured to emit a laser beam; and an objective lens configured to condense the laser beam into a laser spot through which a signal recorded on a signal recording layer of an optical disc is read out by the laser beam, the objective lens having formed thereon a lens surface with a second numerical aperture for acting as a lens, which is larger than a first numerical aperture for forming the laser spot. | 05-19-2011 |
20110110215 | Optical Pickup Apparatus - An optical pickup apparatus comprises: a first laser diode that generates a first laser beam having a first wavelength; a second laser diode that generates a second laser beam having a second wavelength longer than the wavelength; a third laser diode that generates a third laser beam having a third wavelength longer than the first wavelength and shorter than the second wavelength; an objective lens having an inner, outer, intermediate regions on an incident surface, the first laser beam being condensed on a signal recording layer of a first optical disc by condensing actions of the inner and outer regions, the second laser beam being condensed on a signal recording layer of a second optical disc by condensing actions of the inner and intermediate regions, the third laser beam being condensed on a signal recording layer of a third optical disc by condensing actions of the inner and intermediate regions. | 05-12-2011 |
20110103215 | Optical Pickup Apparatus - An optical pickup apparatus, which reads signals recorded on first and second signal recording layers of an optical disc, includes: a laser diode; an objective lens to condense a laser beam to the first and second signal recording layers; and a collimating lens disposed in a light path of the laser beam between the laser diode and the objective lens and configured to correct a spherical aberration by moving in a light axis direction of the laser beam, and the objective lens includes a bifocal lens and is configured such that a second focal point does not coincide in position with the second signal recording layer when a first focal point coincides in position with the first signal recording layer, and the first focal point does not coincide in position with the first signal recording layer when the second focal point coincides in position with the second signal recording layer. | 05-05-2011 |
20100271916 | Optical Disc Apparatus - An optical-disc apparatus comprising: a laser-light source; an objective lens; an aberration-correction lens to be moved in an optical-axis direction according to a cover-layer thickness of an optical disc; a stepping motor; a driving unit to generate a driving pulse for the motor; a storage unit to store current-position information of the aberration-correction lens based on the number of the pulse; and a control unit to control the driving unit so that the aberration-correction lens is moved between a first position set in a mechanical-movable range of the aberration-correction lens and a second position set on the objective-lens side relative to the first position, the driving unit being controlled so that the aberration-correction lens is moved to the second position when stop of disc rotation occurs, and is moved to a start position between the first-and-second positions according to the thickness based on the information when the stop is cancelled. | 10-28-2010 |
20100246370 | OPTICAL PICKUP UNIT AND OPTICAL DISC APPARATUS - An optical pickup unit comprising: an objective lens that focuses laser light on an optical disc; a lens holder that holds the objective lens; a coil that is fitted on the lens holder and capable of driving the lens holder; and a reinforcement member that is fitted on the lens holder and reinforces strength of the lens holder. | 09-30-2010 |
20100243861 | BEAM IRRADIATION DEVICE - A beam irradiation device includes a photodetector which receives servo light; a signal processing section which generates a position detection signal based on a detection signal from the photodetector; and a control section which controls the laser light source and the actuator for beam scanning based on the position detection signal. The signal processing section performs a sampling operation with respect to the detection signal from the photodetector at two consecutive sampling timings. The signal processing section includes an A/D converting section which converts a difference between two sampling values obtained by the sampling operation into a digital signal, and a computing section which computes the position detection signal based on the digital signal from the A/D converting section. | 09-30-2010 |
20100238781 | Optical Pickup Apparatus and Objective Lens - An optical pickup apparatus comprising: a laser diode; an objective lens made of synthetic resin arranged in an optical path of laser light between the laser diode and an optical disc so that the laser light from the laser diode is focused onto a signal recording layer through a protection layer of the optical disc; and an aberration correction element interposed in an optical path of the laser light between the laser diode and the objective lens, the aberration correction element configured to be operated so as to correct spherical aberration caused by moisture-absorption characteristics of the objective lens. | 09-23-2010 |
20100225930 | BEAM IRRADIATION DEVICE AND POSITION DETECTING DEVICE - In a beam irradiation device, laser light emitted from a laser light source is entered into a mirror. An actuator pivotally moves the mirror into which laser light is entered, whereby a targeted area is scanned with the laser light. Servo light emitted from a semiconductor laser is entered into a hologram element. The hologram element is pivotally moved with the pivotal movement of the mirror. A diffraction pattern is formed on an exit surface of the hologram element. A photodetector receives servo light transmitted through the hologram element to output a signal depending on a light receiving position of the servo light. The scan width of servo light on the photodetector is increased by a diffraction function of the hologram element. | 09-09-2010 |
20100188648 | BEAM IRRADIATION DEVICE AND LASER RADAR SYSTEM - A beam irradiation device includes: a laser light source for emitting laser light; an actuator which scans a targeted area with the laser light; a servo optical system which changes a propagating direction of servo light in response to driving of the actuator; a photodetector which receives the servo light to output a signal depending on a light receiving position of the servo light; an actuator controlling section which controls the actuator based on the signal to be outputted from the photodetector; and a laser controlling section which controls the laser light source based on the signal to be outputted from the photodetector. The laser controlling section controls the laser light source to emit the laser light in a pulse manner at a timing when the light receiving position of the servo light coincides with a predetermined targeted position. | 07-29-2010 |
20100182888 | Optical Disc Apparatus - An optical disc apparatus comprising: a spindle motor configured to drive a turntable on which an optical disc is loaded to rotate; a first substrate on which a first support member rotatably supporting a rotation shaft of the spindle motor is fixed, and on which a second support member is formed at a position adjacent to the spindle motor; a second substrate; an optical pickup device; and a guide member configured to guide the optical pickup device in a radial direction of the optical disc loaded on the turntable, one end of the guide member being supported by the second support member on the first substrate and fixed to a fixing member on the second substrate, and the other end of the guide member being fixed to the fixing member on the second substrate. | 07-22-2010 |
20100149947 | Laser Converging Apparatus, Optical Pickup Device, and Optical Disc Recording/Reproducing Apparatus - A laser converging apparatus comprising: a nonpolarizing hologram element having a first area defined by a numerical aperture corresponding to a thickness of a first protective layer of a first disk medium and a second area inside the first area, the second area defined by a numerical aperture corresponding to a thickness of a second protective layer (>the thickness of the first protective layer) of a second disk medium, the second area having a hologram pattern for diffracting laser light into zero order light and high-order diffracted light having the order of primary or higher; an objective lens having the numerical aperture corresponding to the thickness of the first protective layer, the objective lens converging the laser light having passed through a part of the first area other than the second area and the zero order light having passed through the second area onto an information surface on one side of the first protective layer, the objective lens converging the high-order diffracted light having passed through the second area onto an information surface on one side of the second protective layer; and a holder that holds the nonpolarizing hologram element and the objective lens. | 06-17-2010 |
20100078582 | BEAM IRRADIATION DEVICE AND POSITION SENSING DEVICE - A beam irradiation device includes an actuator that scans a target region with laser light in a two-dimensional direction, and a servo optical system that changes a traveling direction of servo light along with driving of the actuator. The servo optical system includes a splitting element that splits the servo light, a first position sensing device that receives a first beam split by the splitting element and outputs a signal at a light-receiving position in a first direction, and a second position sensing device that receives a second beam split by the splitting element and outputs a signal at a light-receiving position in a second direction different from the first direction. | 04-01-2010 |
20100073750 | BEAM IRRADIATION APPARATUS - A light refracting element formed in parallel plate shape is attached to a support shaft of a mirror holder, a semiconductor laser and a PSD are disposed at positions between which the light refracting element is sandwiched. The light refracting element is rotated by rotation of the mirror holder, and whereby a laser beam irradiation position is changed on a light acceptance surface of PSD. The laser beam irradiation position on a light acceptance surface corresponds to the mirror rotation position, so that the mirror rotation position and a laser beam scanning position in a target area can be detected based on an output from the PSD. | 03-25-2010 |
20100014139 | BEAM IRRADIATION APPARATUS - A beam irradiation apparatus includes: an actuator which scans a target region with a laser beam; a photodetector which receives a servo beam and outputs a signal according to a beam reception position; an optical unit which makes the servo beam displaced on the photodetector in association with driving of the actuator; and a position signal generation circuit that generates a signal according to the reception position of the servo beam based on an output signal from the photodetector. The position signal generation circuit has a signal removal circuit that removes a disturbance signal generated when the laser beam is incident on the photodetector, from an output signal of the photodetector. | 01-21-2010 |
20100002278 | BEAM IRRADIATION APPARATUS - A beam irradiation apparatus includes: an optical element which changes a travel direction of a laser beam by being rotated in a predetermined direction; an actuator which rotates the optical element in the direction; a refractive element which is disposed in the actuator and rotates in association with rotation of the optical element; a servo beam source which emits a servo beam to the refractive element; a photodetector which receives the servo beam refracted by the refractive element and outputs a signal according to a position where the servo beam is received; and a power adjustment circuit which adjusts emission power of the servo beam source. The power adjustment circuit adjusts the emission power so that a reception amount of the servo beam in the photodetector becomes constant based on an output signal from the photodetector. | 01-07-2010 |
20090290475 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a diffraction grating configured to diffract laser light from a laser diode so that signals recorded in first and second optical discs are selectively reproduced, thicknesses of protective layers between surfaces and signal recording surfaces of the first and second optical discs being different from each other; a polarization beam splitter configured to divide laser light from the diffraction grating into first and second laser lights whose light amounts are substantially the same; a first objective lens configured to focus the first laser light onto the signal recording surface of the first optical disc; a second objective lens configured to focus the second laser light onto the signal recording surface of the second optical disc; and a photodetector configured to be applied with return lights of the first and second laser lights reflected from the signal recording surfaces of the first and second optical discs. | 11-26-2009 |
20090252022 | Method of Manufacturing Synthetic Resin Lens, Method of Manufacturing Reformed Synthetic Resin Material and Optical Pickup Apparatus - A method of manufacturing a synthetic resin lens, comprising: adjusting a degree of change in transmittance of a lens member made of synthetic resin for a blue violet laser beam with accumulated application of the blue violet laser beam, by applying to the lens member an electromagnetic wave shorter in wavelength than the blue violet laser beam. | 10-08-2009 |
20090245073 | OPTICAL PICKUP APPARATUS - An optical-pickup apparatus comprising: a laser diode; an objective lens made of a synthetic resin to focus laser light emitted from the laser diode onto a signal-recording layer of an optical disc; a collimating lens that is arranged in an optical path between the laser diode and the objective lens, and is so movable in an optical axis direction of the laser light as to correct spherical aberration; a temperature sensor to detect a temperature of the objective lens; and an aberration-correcting device to move the collimating lens from a first position where the spherical aberration is a predetermined value on a positive side to a second position where the spherical aberration is a predetermined value on a negative side, when an amount of change in temperature detected by the temperature sensor reaches a predetermined amount after an operation of reproducing a signal from the signal-recording layer is started. | 10-01-2009 |
20090245072 | OPTICAL PICKUP APPARATUS - An optical-pickup apparatus comprising: a laser diode to emit laser light forward and backward; an objective lens to focus the laser light emitted forward from the laser diode onto a signal-recording layer of an optical disc; a spherical-aberration correction element that is arranged on an optical path between the laser diode and the objective lens, and is so movable in an optical-axis direction of the laser light as to correct spherical aberration; a movement-position detection unit to detect a movement position of the spherical-aberration correction element, and output a detection signal indicating the movement position of the spherical-aberration correction element; a photodetector to receive the laser light emitted backward from the laser diode, and output a monitor signal corresponding to a light-receiving level of the laser light; and a control unit to control intensity of the laser light emitted from the laser diode based on the monitor and detection signals. | 10-01-2009 |
20090231984 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a laser diode; an objective lens made of a synthetic resin configured to focus laser light emitted from the laser diode to a signal recording layer of an optical disc; and a collimating lens having a diffraction grating and arranged in an optical path between the laser diode and the objective lens, the collimating lens being so moved in an optical axis direction of the laser light as to correct spherical aberration occurring in response to a change in temperature when performing a recording operation for the optical disc, and the collimating lens correcting by the diffraction grating chromatic aberration occurring when switching from the recording operation to a reproducing operation for the optical disc. | 09-17-2009 |
20090213706 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a laser diode; an objective lens configured to focus laser light emitted from the laser diode on a signal recording layer of an optical disc; a first aberration correction element arranged in an optical path between the laser diode and the objective lens; and a second aberration correction element arranged in the optical path between the laser diode and the objective lens and having an aberration correction speed lower than the aberration correction speed of the first aberration correction element, the first aberration correction element and the second aberration correction element being selectively operated according to the required aberration correction speed. | 08-27-2009 |
20090201791 | OPTICAL PICKUP APPARATUS - An optical-pickup apparatus comprising: a polarization beam splitter fixed to a base, which includes a first prism that laser light emitted from a laser diode enters, a second prism that return light of the laser light reflected from a signal recording layer of an optical disc enters, and a control film that is formed on either one of opposed surfaces of the first and second prisms so that the laser light and the return light are selectively passed through or reflected from the control film, the opposed surfaces being opposed to each other; and first and second positioning pins provided on the base to position the polarization beam splitter, the polarization beam splitter being fixed to the base in a state where the opposed surface of at least one of the first and second prisms is made in contact with at least one of the first and second positioning pins. | 08-13-2009 |
20090201488 | BEAM IRRADIATION DEVICE, LASER RADAR SYSTEM, AND DETECTING DEVICE - A beam irradiation device includes: a first light source for emitting laser light; an actuator for moving a scanning section for receiving the laser light to scan a target area with the laser light; a second light source movable with the scanning section and adapted for emitting diffused light; a light receiving position detecting device for receiving the diffused light to output a signal depending on a position of receiving the diffused light; and a light projecting element, disposed at a position closer to the light receiving position detecting device with respect to an intermediate position between the second light source and the light receiving position detecting device, for projecting an emission position to be defined by the second light source on the light receiving position detecting device via a predetermined projection area. | 08-13-2009 |
20090196146 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a diffraction grating that a laser beam enters, the diffraction grating being configured to generate a main beam that is 0th order light and sub-beams that are +1st order diffracted light and −1st order diffracted light; an objective lens configured to focus the main beam and the sub-beams onto a signal recording layer; a main-beam light-receiving portion that the main beam reflected by the signal recording layer is applied to; and sub-beam light-receiving portions that the sub-beams reflected by the signal recording layer are respectively applied to, each light-receiving area of the sub-beam light-receiving portions being smaller than a light-receiving area of the main-beam light-receiving portion. | 08-06-2009 |
20090154310 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a laser diode emitting laser light having a first wavelength; an objective lens focusing the laser light having the first wavelength emitted from the laser diode to each signal recording layer of a first optical disc for which the laser light having the first wavelength is specified as laser light for reproducing a signal and a second optical disc for which laser light having a second wavelength different from the first wavelength is specified as laser light for reproducing a signal; and a spherical aberration correction element disposed in an optical path between the laser diode and the objective lens, the spherical aberration correction element correcting each spherical aberration of the first optical disc and the second optical disc to reproduce a signal recorded in each signal recording layer of the first optical disc and the second optical disc. | 06-18-2009 |
20090129245 | Optical Pickup Apparatus - An optical pickup apparatus comprising: an objective lens focusing laser light emitted from a laser diode to a signal recording layer of an optical disc; a photodetector including a substantially square light-receiving region made of first to fourth sensors divided by boundaries in a first direction corresponding to a tracking direction and a second direction crossing the first direction, the light-receiving region being irradiated with reflected light of the laser light which is reflected from the signal recording layer thereof; and a half mirror reflecting the laser light in a direction of the objective lens and allowing the reflected light to pass therethrough in a direction of the photodetector, the boundary in the second direction for dividing the first to fourth sensors in the light-receiving region being set according to a shape of a spot of the reflected light directly applied from the half mirror to the light-receiving region. | 05-21-2009 |
20090103577 | BEAM IRRADIATION APPARATUS - A laser beam and a servo beam are incident on a mirror and a transparent member, respectively, so that an angle direction A | 04-23-2009 |
20090073857 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a collimating lens configured to convert laser light emitted from a laser diode, from diffused light into parallel light; an objective lens; and a prism configured to guide the laser light emitted from the collimating lens to the objective lens, the prism including: a first face that the laser light emitted from the collimating lens enters; a second face that reflects the laser light entering the first face; and a third face that reflects the laser light reflected from the second face in a direction of the second face, and emits the laser light reflected again from the second face in a direction of the objective lens. | 03-19-2009 |
20090070794 | OPTICAL MEMBER DRIVING APPARATUS, OPTICAL PICKUP APPARATUS INCLUDING THE OPTICAL MEMBER DRIVING APPARATUS, OPTICAL DISC APPARATUS INCLUDING THE OPTICAL PICKUP APPARATUS - An optical member driving apparatus comprising: a holding member configured to have an optical member mounted thereon; a driving unit assembly configured to be capable of driving the holding member; a connecting member configured to connect the holding member and the driving unit assembly; and a jointing member configured to joint the connecting member and either or both of the holding member and the driving unit assembly. | 03-12-2009 |
20090059766 | BEAM IRRADIATION DEVICE AND LASER RADAR - A beam irradiation device includes a light source for emitting laser light, an actuator for displacing a propagation direction of the laser light in accordance with a control signal, and a scan expansion lens for increasing a swing width of the laser light to be generated by the actuator. A spectral element is arranged between the actuator and the scan expansion lens. The spectral element allows at least a part of the laser light to be incident from the actuator to transmit, and reflects at least a part of the laser light to be incident from the scan expansion lens. The beam irradiation device further includes a light detector for receiving the laser light to be reflected on the spectral element to output an electrical signal. | 03-05-2009 |
20090051997 | LASER RADAR AND BEAM IRRADIATION APPARATUS THEREFOR - A laser radar according to an embodiment of the invention includes a beam irradiation head which emits a laser beam and a control circuit which controls the beam irradiation head to perform scan in a two-dimensional direction with the laser beam. In the laser radar, the beam irradiation head includes a laser beam source; a mirror to which the laser beam emitted from the laser beam source is incident; and a driving mechanism which rotates the mirror in first and second directions about a first rotating axis and a second rotating axis perpendicular to the first rotating axis respectively. The control circuit controls the rotation of the mirror in the first direction and the second direction such that a scan region of the laser beam becomes a rectangular shape. | 02-26-2009 |
20090034392 | PHOTODETECTOR AND OPTICAL PICKUP APPARATUS INCLUDING THE SAME - A photodetector comprising: a substrate; a photodiode fixed to the substrate, the photodiode configured to output a signal according to a light amount of a laser beam when applied with the laser beam; and a translucent resin covering the photodiode, the translucent resin being irradiated with ultraviolet light in advance for a predetermined time such that a change in transmittance of the translucent resin for the laser beam having a predetermined wavelength is set within a predetermined range. | 02-05-2009 |
20090022038 | OBJECTIVE LENS, AND METHOD OF MANUFACTURING THE SAME AND OPTICAL PICKUP APPARATUS - An objective lens formed of a synthetic resin material having characteristics of substantially not reducing transmittance of the objective lens when a first laser beam having a first wavelength passes through the objective lens, and reducing the transmittance according to an elapsed time to apply a second laser beam when the second laser beam having a second wavelength shorter than the first wavelength and longer than a wavelength of ultraviolet light passes through the objective lens, the objective lens being irradiated with the ultraviolet light in advance for a predetermined time such that a change in the transmittance for the second laser beam is set within a predetermined range. | 01-22-2009 |
20090022037 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a first objective lens; and a second objective lens arranged with the first objective lens in a radial direction of an optical disc, the first objective lens being configured to focus laser light for reproduction, which is laser light for reproducing a signal recorded in a signal recording layer of the optical disc, onto the signal recording layer, the second objective lens being configured to focus laser light for recording, which is laser light for recording a signal, onto the signal recording layer. | 01-22-2009 |
20090022032 | Optical Pickup Unit and Optical Disk Apparatus - An optical pickup unit comprises a diffraction grating that divides light into at least three luminous fluxes and condenses the three luminous fluxes to apply at least three focusing spots, independent of each other, onto a signal side of a medium. The diffraction grating is divided into at least four regions, a first region, a second region, a third region, and a fourth region. | 01-22-2009 |
20080316903 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a collimating lens configured to convert laser light having Gaussian distribution property emitted from a laser diode from divergent light to parallel light; an objective lens configured to focus the laser light from the collimating lens onto a signal recording layer of an optical disc; and an adjustment film formed on a surface of an incident face of the collimating lens on which the laser light is incident, and configured to adjust transmittance of the laser light passing through the collimating lens, the adjustment film being formed on the surface of the incident face so that the transmittance is lower on the inner side of the incident face than on the outer side of the incident face. | 12-25-2008 |
20080316373 | PROJECTION TYPE IMAGE DISPLAY DEVICE - A beam modulated by a video signal scans a projected region. A spot size of the beam in the projected region is set to be smaller than a width of one pixel in a direction vertical to a scanning direction. A group of pixels disposed in the scanning direction is scanned by the beam a plurality of times to display one screen. A scanning position of the beam with regard to the group of the pixels is shifted in the direction vertical to the scanning direction for every scanning turn to display one screen. | 12-25-2008 |
20080310286 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: an objective lens formed so that a first and second laser beams different in wavelength are respectively focused onto signal recording layers of a first and second optical discs; and a photodetector including a square-shaped light-receiving portion for being irradiated with return light, as a spot, of the first or second laser beam respectively reflected from the signal recording layers of the first or second optical discs, to generate a focus error signal, a length of a diagonal line of the light-receiving portion being substantially equal to a longer diameter of an elliptical spot formed in a direction of the diagonal line when the focus error signal is at a maximum level for an optical disc that is either one of the first and second optical discs, to which a laser beam shorter in wavelength out of the first and second laser beams is focused. | 12-18-2008 |
20080267043 | Optical pickup having optical path length correction function - An optical pickup configured so as to reproduce signals recorded in optical disks of plural standards by means of a single laser beam. The optical pickup has an objective lens for gathering a laser beam emitted from a semiconductor laser—which emits a laser beam of single wavelength—onto a signal recording layer provided in each of optical disks of first and second standards whose cover layers differ from each other in terms of a thicknesses. The first standard is; for example, a CD, and the second standard is; for example, a DVD. An optical path length correction member—in which there is formed an optical path length correction section for making a correction to an optical path length falling within a range smaller than the diameter of a light beam passing through the objective lens—is provided in an optical path between the semiconductor laser and the objective lens. The optical path length correction section may also be formed on a lens plane of the objective lens facing the semiconductor laser. | 10-30-2008 |
20080267042 | OPTICAL PICKUP DEVICE - A quarter-wave plate and a polarization beam splitter are used as means for guiding a laser beam to first and second objective lenses. A half of the circularly-polarized laser beam incident to the polarization beam splitter is reflected in the form of an S-polarized light component by the polarization beam splitter and guided to a first objective lens, and the other half is transmitted through the polarization beam splitter in the form of a P-polarized light component and guided to a second objective lens. The whole of light quantity of the laser beam reflected from an optical disk through the first or second objective lens passes substantially through the polarization beam splitter. Therefore, the light quantity of the laser beam guided to a photodetector can be enhanced. | 10-30-2008 |
20080259457 | OPTICAL ELEMENT, MASTER PROTOTYPE, RESIN MASTER, RESIN MOLDED ARTICLE AND METAL MOLD - For generation of optical elements, a master prototype, a resin master, a resin molded article or a metal mold is used. In the master prototype, the resin master, the resin molded article or the metal mold, a fine relief structure is formed on a plane through which an object light is transmitted at a pitch smaller than a wavelength band of the object light, an identification pattern region is disposed in a part of a region where fine relief structure is formed, and in the identification pattern region, a state of the fine relief structure is different from that in the other region. An actual manufacturer of the master prototype, the resin master, the resin molded article or the metal mold can be identified by physically verifying the identification pattern region. | 10-23-2008 |
20080250439 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: a housing configured to include an optical component including a laser diode emitting a laser beam, the housing being made of metal; and a heatsink configured to dissipate heat generated from the laser diode, the heatsink being made of metal different from the metal of the housing; the heatsink being fixed to the housing with one screw and adhesive. | 10-09-2008 |
20080232204 | OPTICAL DISK APPARATUS AND OPTICAL PICKUP DEVICE - A temperature sensor is disposed in an optical pickup to detect a temperature of an objective lens. An optical element (for example, a collimator lens) is driven according to a temperature change of the objective lens, which corrects deterioration of an optical characteristic of a laser beam passing through the objective lens. Good recording/reproduction is smoothly performed even if the optical characteristic of the objective lens is changed with the temperature change. | 09-25-2008 |
20080225675 | Optical disk apparatus - An optical disk apparatus includes: a semiconductor laser which emits laser light; a focusing unit which focuses the laser light emitted from the semiconductor laser onto an optical disk; a detector which receives reflected light from the optical disk; a drive unit which rotates the optical disk; and a control unit which controls the semiconductor laser and the drive unit. When the optical disk is reproduced, the control unit causes the semiconductor laser to emit the laser light by a first power realizing a relative intensity noise tolerable for the reproduction of the optical disk. And the control unit causes the drive unit to rotate the optical disk at a first linear velocity which is free from reproduction light deterioration when the semiconductor laser emits the laser light by the first power. | 09-18-2008 |
20080212452 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus comprising: an objective lens configured to focus laser light having the Gaussian distribution properties emitted from a laser diode to a signal recording layer of an optical disc; and an adjustment coating formed on a surface of an incident face of the objective lens on which the laser light is to be made incident, the adjustment coating being configured to adjust transmittance of the laser light passing through the objective lens, the adjustment coating being formed on the surface of the incident face such that the transmittance is lowered as a numerical aperture of the objective lens is reduced. | 09-04-2008 |
20080212036 | Projection Type Color Projector - A projection type color projector apparatus comprising: a laser light source configured to emit laser beams of three colors, red, green, and blue, in accordance with an image signal for projecting a color image on a screen; and a color image generating unit configured to generate the color image based on the laser beams, among spot diameters of the laser beams of three colors making up each pixel of the color image, a spot diameter of one laser beam being different from a spot diameter of another laser beam. | 09-04-2008 |