| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369112240 | Plural distinct lenses | 56 |
| 20080239929 | OPTICAL HEAD DEVICE - An optical head device may include a first laser light source, a second laser light source, a first parallel-plate type beam splitter for guiding a first and a second laser beams to a common objective lens, a second parallel-plate type beam splitter for guiding the second laser beam to the common objective lens, an aberration correction lens disposed between the first laser light source and the first beam splitter for correcting an aberration generated when the first laser beam transmits through the first beam splitter; and a light source unit which is structured by fixing the first laser light source and the aberration correction lens to a common holder in a state that a relative position between the first laser light source and the aberration correction lens is previously set. | 10-02-2008 |
| 20080253266 | OPTICAL PICKUP DEVICE AND OPTICAL DISK APPARATUS - Optical characteristics of laser beams guided to first and second objective lenses are adjusted by integrally driving first and second lens elements. The first and second lens elements are disposed such that the second lens element is located at a position shifted in an optical axis direction of the laser beam by a predetermined distance from a control operation position of the second lens element when the first lens element is located at a control operation position of the first lens element. | 10-16-2008 |
| 20090022039 | Optical Pickup and Objective Optical System for Use in the Same - An optical pickup ( | 01-22-2009 |
| 20090022040 | OPTICAL PICKUP AND OPTICAL DISC APPARATUS USING THE SAME - An optical pickup includes first and second objective lenses; a first raising optical element that reflects an optical beam from a first direction within a plane substantially orthogonal to an optical axis of the first objective lens, thereby the optical beam being incident on the first objective lens; and a second raising optical element that reflects an optical beam from a second direction at an angle to the first direction within a plane substantially orthogonal to the optical axis of the second objective lens, thereby the optical beam being incident on the second objective lens. At least one lateral surface of at least one of the first and second raising optical elements is at an angle of 90 degrees or smaller to a reflection surface thereof. The lateral surface of the one raising optical element is arranged to face a lateral surface of the other raising optical element. | 01-22-2009 |
| 20090028037 | OPTICAL SCANNING DEVICE - An optical scanning device for scanning a record carrier ( | 01-29-2009 |
| 20090034402 | Optical Head Device, Optical Information Device, Optical Disc Player, Car Navigation System, Optical Disc Recorder, and Optical Disc Server - In an optical head device including a light source for emitting a light of a predetermined wavelength; a collimator lens for converting a divergence degree of the light; a folding mirror for folding a direction of the light emitted from the light source; an objective lens for converging the light on a recording surface of an optical disc; a photodetector for receiving the light reflected at the recording surface of the optical disc, and converting to an electric signal; and an optical path adjustment unit for guiding the light emitted from the light source to the collimator lens and guiding the light reflected at the recording surface of the optical disc to the photodetector; a wavelength plate for polarizing the light reflected by the folding mirror is arranged on an actuator base between the folding mirror and the objective lens. | 02-05-2009 |
| 20090040909 | Optical head device and optical information device - An optical head device is provided with a light source | 02-12-2009 |
| 20090046564 | OPTICAL HEAD AND OPTICAL DISC DEVICE - In an optical head ( | 02-19-2009 |
| 20090059771 | OPTICAL PICKUP - An optical pickup includes a blue laser source; a red laser source; an infrared laser source; a blue light objective lens focusing blue light emitted from the blue laser source onto an optical storage medium; and a red and infrared light objective lens focusing red light emitted from the red laser source and infrared light emitted from the infrared laser source onto the optical storage medium. The optical pickup contains a blue light startup mirror separating the blue light from the red and infrared light. The blue light startup mirror is disposed along optical paths extending from the blue laser source, the red laser source, and the infrared laser source to the blue light objective lens and the red and infrared light objective lens. The optical pickup also contains a low blue light transmittance plane and a low blue light reflectance plane along an optical branch path extending from the blue light startup mirror to the red and infrared light objective lens. The configuration greatly restrains the spilling of the blue light into the red and infrared light objective lens, preventing degradation of the red and infrared light objective lens. | 03-05-2009 |
| 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 |
| 20090086611 | Optical Disc Drive, Optical Pickup and Optical Component Used Therefor - Provided are an optical pick up and an optical component used for the optical pickup which are capable of preventing or restraining occurrence of deviation and unbalance which are caused by assembly errors during manufacturing of optical components, a temperature variation or the like. The optical pickup comprises a laser, a polarization changeover element for changing over a direction of polarization of an optical beam emitted from the laser, a beam splitting element for splitting the laser beam into a plurality of optical paths in accordance with a direction of a polarization, a plurality of objective lenses for focusing laser beams onto a recording layer of the optical disc, a rise-up mirror, and a plurality of coupling lenses arranged respectively intermediate of the plurality of optical paths led to the plurality of objective lenses. The rise-up mirror is arranged intermediate of the plurality of optical paths led to the plurality of objective lenses and adapted to be used common to respective optical beams on the plurality of optical paths. The plurality of the coupling lenses are coupled to and held on one and the same drive portion. | 04-02-2009 |
| 20090086612 | OPTICAL PICKUP HEAD AND OPTICAL RECORDING AND REPLAYING DEVICE - Optical pickup head comprises two semiconductor lasers for irradiating first to third optical beams, light receiving element for converting an optical signal into an electrical signal, and object lens unit. Object lens unit includes first object lens (object lens for CD, DVD, and HD-DVD) and second object lens (object lens for Blu-ray Disc) having a numerical aperture different from first object lens. First object lens and second object lens are moved in a tangential direction or in a radial direction of recording medium, so that first object lens and second object lens can be selectively arranged opposite to a position to be irradiated with the optical beam of recording medium. | 04-02-2009 |
| 20090161522 | Apparatus for Reproducing and/or Recording and Recording Medium - An apparatus for reproducing and/or recording a recording medium ( | 06-25-2009 |
| 20090168633 | OPTICAL PICKUP APPARATUS, OPTICAL READ/WRITE APPARATUS, AND GAP CONTROL METHOD - An optical pickup apparatus includes a light source, focusing optics, a light detector, a controller, and a drive unit. The drive unit first drives the focusing optics to a specific position on an information recording medium. Light from the light source irradiates the information recording medium via the focusing optics as near-field light. Light reflected off the medium due to total internal reflection is then detected by the light detector, generating a gap error signal as a result. The controller then generates a gap servo signal by conducting a feed-forward control, whereby a push-pull signal in the direction orthogonal to the relative travel direction of the medium is applied to the gap error signal. In so doing, precise control of the gap size between the focusing optics and the information recording medium is achieved for near-field read/write operations. | 07-02-2009 |
| 20090201788 | Acousto-optic reading/recording head for high-density optical disks - High-density optical data storage comprising multi-layer optical disc and multi-wavelength reading/recording head, wherein the reading/recording head utilizes a single-mode optic fiber connecting the head with remote short-wavelength laser and acousto-optical (AO) cells that allow precisely positioning the focused light spot on the track and filtering the specific wavelength from multi-wavelength light emitted by the laser built in the head. | 08-13-2009 |
| 20090201789 | OPTICAL HEAD DEVICE FOR FORMING LIGHT SPOT ON DISC-SHAPED INFORMATION MEDIUM - An optical head device has at least one upward-reflecting mirror, objective lenses, an objective lens actuator, and a moving mechanism. The upward-reflecting mirror receives an incident luminous flux having a wavelength emitted from a semiconductor, and changes its direction. The objective lenses having mutually different numerical apertures condenses the luminous flux whose direction has been changed by the upward-reflecting mirror to radiate a condensed luminous flux onto an information recording medium. The objective lens actuator moves the objective lenses in the focus direction of the information recording medium so that the luminous flux incident on the information recording medium becomes in a focused state. The moving mechanism moves the upward-reflecting mirror so that the luminous flux is incident on the information recording medium via any one of the objective lenses. | 08-13-2009 |
| 20090207716 | Optical Pickup Apparatus - An optical pickup apparatus includes: a first light source; a second light source; a light-converging optical system including a coupling lens and an objective lens; and a photodetector. The optical pickup apparatus is capable of recording and/or reproducing information by converging a light flux from each of the first and second light sources with the light-converging optical system on an information recording surface of each of first and second optical information recording media through a protective layer, and by detecting the light flux reflected from the information recording surface and passing through the light-converging optical system again, on the photodetector. The optical pickup apparatus satisfies predetermined conditions according to an optical path length from each of first and second light sources and the information recording medium, a magnification of the objective lens, and a magnification of the light-converging optical system. | 08-20-2009 |
| 20090213718 | OPTICAL RECORDING DEVICE AND OPTICAL RECORDING AND REPRODUCTION DEVICE - An optical recording device includes a light source, a spatial light modulator, a correcting optical system and a light guiding section. The spatial light modulator includes plural pixels, a signal light region that displays a signal light pattern, and a reference light region that displays a reference light pattern. The spatial light modulator modulates and outputs incident light for each pixel in accordance with a display pattern. The correcting optical system includes a pair of axicon lenses that correct the emitted light from the light source so as to flatten the light intensity distribution thereof on an irradiated surface of the spatial light modulator. The light guiding section guides the corrected light to the spatial light modulator. The signal light and the reference light are irradiated onto an optical recording medium simultaneously and a hologram is recorded into the optical recording medium. | 08-27-2009 |
| 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 |
| 20090245074 | PICK-UP HEAD ASSEMBLY FOR OPTICAL DISC EMPLOYING ELECTRICALLY TUNABLE LIQUID CRYSTAL LENS - An optical disc storage system employs a read/write pick-up head assembly in which the optical path between the disc and the read/write light source, usually a laser diode, includes both a conventional objective lens formed of glass or plastic, with a fixed focus, and a liquid crystal lens which is electrically tunable to vary its refractive index and focal distance. The optical signal reflected from the disc is passed through this hybrid pick-up head assembly and demodulated to detect errors in the focus of the pick-up head and the tracking, and to adjust the focus by modifying the electrical signals applied to the LCD lens, and move the pick-up head in the plane of the disc to address the appropriate track. | 10-01-2009 |
| 20090262634 | FOCUS OPTICAL SYSTEM AND OPTICAL DISC MASTER EXPOSURE APPARATUS - In a focus optical system for optical discs or optical disc master exposure apparatuses, a relative positional relation between a cylindrical lens and a 4-division detector in an astigmatic optical system is adjust so that an interference fringe appearing in reflected light derived from an optical disc master is made to be incident on a dead zone of the 4-division detector. Thus, an astigmatic focus servo free from effects of variations in a focus error signal due to the interference fringe is realized. As a result of this, effects of the interference fringe appearing in the reflected light derived from an optical disc or optical disc master can be suppressed. | 10-22-2009 |
| 20090262635 | OBJECTIVE OPTICAL SYSTEM FOR OPTICAL PICKUP APPARATUS, OPTICAL PICKUP APPARATUS, DRIVING APPARATUS FOR OPTICAL INFORMATION RECORDING MEDIUM, CONDENSER LENS AND OPTICAL PATH COMPOUNDING ELEMENT - An objective lens system for an optical pickup apparatus, includes in order from an object side: a first lens group having negative paraxial power P | 10-22-2009 |
| 20100034073 | OPTICAL HEAD DEVICE AND RECORDING/REPRODUCTION DEVICE - An optical head device includes a first light source and a second light source which respectively emits a first light beam and a second light beam, a luminous flux separating section which selectively separates the first and second light beams for which the same optical path is used, to first and second optical paths, respectively, a first objective lens for converging the first light beam that has been separated to the first optical path on the first optical information recording medium, a second objective lens made of resin for converging the second light beam separated to the second optical path on the second optical information recording medium, and a first filtering section formed on a beam exit face of the second objective lens, for reducing the transmittance of the first light beam to be lower than transmittance of the second light beam. | 02-11-2010 |
| 20100054107 | RECORDING AND REPRODUCING APPARATUS - The recording and reproducing apparatus has rotary drive unit (a motor) that rotationally drives a multilayer recordable recording medium | 03-04-2010 |
| 20100067356 | OPTICAL ELEMENT FOR OPTICAL PICKUP DEVICE, OPTICAL PICKUP DEVICE AND METHOD FOR ASSEMBLING OPTICAL PICKUP DEVICE - An optical element for an optical pickup device which can record and/or reproduce information interchangeably with an optical disc while correcting coma satisfactorily, and a compact optical pickup device employing that optical element and exhibiting excellent energy saving. In the optical element for an optical pickup device where a first objective lens portion and a second objective lens portion are formed integrally, one of the first objective lens portion and the second objective lens portion satisfies a relation |HCM|/|TCM|<0.3 and the other satisfies a relation |HCM|/|TCM|>0.3. The HCM represents the third-order angle of view coma sensitivity in the first objective lens portion or the second objective lens portion, and the TMC represents the third-order inclination angle coma sensitivity in the first objective lens portion or the second objective lens portion. | 03-18-2010 |
| 20100091636 | OPTICAL HEAD, AND INFORMATION RECORDING-AND-REGENERATION APPARATUS - An optical head that is restrained from becoming larger, even if it is used for an optical-information recording medium that includes a plurality of information recording layers. In this optical head, a collimating lens is formed by a concave lens disposed on the side of a light source and a convex lens disposed on the side of an objective lens. A collimating-lens actuator moves the convex lens in a direction where a spherical aberration is cancelled which is generated according to the thickness of a light transmission layer up to an information recording layer of the optical-information recording medium. An aperture stop is provided on the side of the collimating lens with respect to the objective lens, and the aperture stop is located near the focal position of the convex lens on the side of the objective lens. | 04-15-2010 |
| 20100103802 | OPTICAL UNIT AND ELECTRONIC EQUIPMENT USING THE SAME - An optical unit includes: a first light emitting device configured to emit a first beam; and a second light emitting device configured to emit a second beam in a direction the same as a direction of the first beam where the second beam is different in wavelength from the first beam. An emission surface of the second light emitting device is arranged at a distance from an emission surface of the first light emitting device in an opposite direction to the direction of the first beam. | 04-29-2010 |
| 20100103803 | OPTICAL HEAD, OPTICAL DISC DEVICE AND INFORMATION PROCESSING DEVICE - It is aimed to provide an optical head, an optical disc device and an information processing device capable of suppressing the amount of third-order astigmatism created upon recording or reproducing information on or from a multi-layer optical disc including at least three information recording surfaces. | 04-29-2010 |
| 20100103804 | SYSTEM AND METHOD FOR PROCESSING OF IMAGE DATA IN THE MEDICAL FIELD - An image processing system in the medical field is provided. The system for processing image data includes at lest two graphics processors, at least one renderer module for rendering image data and at least one reconstruction module for volume reconstruction. In a first operating mode of the system in which at least one reconstruction module is inactive, the instructions of at least one renderer module is able to be executed by at least two of the graphics processors. In a second operating mode of the system in which at least one reconstruction module is active, the instructions of at least one renderer module and the instructions of at least one reconstruction module is able to be executed separately on different graphics processors of the said graphics processors. During operation in one of the two operating modes, a switch can be made to the other operating mode in each case. | 04-29-2010 |
| 20100124160 | OPTICAL RECORDING SYSTEM TO RECORD INFORMATION WITH LIGHT - A multilayer optical recording system to record information with light includes a lens unit, a recording medium, and a microscopic drive unit. The lens unit includes a metamaterial lens or a plasmon lens. The metamaterial lens has a first dielectric member in which first microstructures are implanted in a substantially regular manner. The plasmon lens has an aperture. The aperture is a hole or a slit created in a metal film. The microscopic drive unit is configured to adjust a relative position between the lens unit and the recording medium. In addition, the principal plane is placed to be in contact with the lens unit or to have a gap between the principal plane and the lens unit. Furthermore, the second microstructures are arranged periodically in a direction substantially perpendicular to the principal plane of the recording medium. | 05-20-2010 |
| 20100124161 | OPTICAL PICKUP AND OPTICAL INFORMATION REPRODUCING DEVICE - An optical pickup and an optical information recording and reproducing device in which spherical aberration correction control after a disc is loaded can be efficiently made in a short time. Before an information recording medium is loaded into a drive, an optical axis direction position of a concave lens is preset to a state so as to optimize a converging spot on a recording surface of a single-layered medium of as a first recording medium or a predetermined layer (first layer having a substrate thickness of 0.1 mm) of a medium having two or more layers to which the recording/reproduction is executed by a laser light source. After the information recording medium is loaded, if it is determined to be a second (third) recording medium to which the recording/reproduction is executed by a laser light source, setting of the optical axis direction position of the concave lens is changed. | 05-20-2010 |
| 20100142358 | OPTICAL HEAD, OPTICAL DISC DEVICE, COMPUTER, OPTICAL DISC PLAYER AND OPTICAL DISC RECORDER - An optical head ( | 06-10-2010 |
| 20100208571 | Optical Pickup Apparatus and Optical Disk Apparatus Using the Same - An optical pickup apparatus includes a light source emitting a light, an objective lens collecting the light on an optical disk, a collimate lens that is moved in an optical axis direction along a light path of the light to change a divergent angle or a convergent angle of the light, a starting prism that expands a spot shape of an incident light in a first predetermined direction to emit the light, and a beam shaping prism that expands a spot shape of an incident light in a second predetermined direction to emit the light, and the collimate lens, the beam shaping prism, and the starting prism are disposed in order from the light source side toward the objective lens on a light path connecting the light source and the objective lens, and the first predetermined direction is perpendicular to the second predetermined direction. Thereby, it is possible to make an attempt to thin the optical pickup apparatus and an optical disk apparatus using the optical pickup apparatus. | 08-19-2010 |
| 20100214904 | Optical Pickup Having Radially Arranged Lenses in a Low Profile Construction - An optical pickup includes a first source which emits a first beam with a first wavelength; a second source which emits a second beam with a wavelength shorter than the first wavelength; a first collimate lens which collimates the first beam; a second collimate lens which collimates the second beam; a first objective lens which converges the first collimated beam onto an optical disc; and a second objective lens which converges the second collimated beam onto the disc. The first and second objective lenses are arranged in the disc radial direction. The second objective lens is arranged closer to the side of the disc outer circumference than the first objective lens. The first collimate lens is arranged on the right-hand side when the second objective lens is viewed from the first objective lens. The second collimate lens is arranged on the left-hand side when the first objective lens is viewed from the second objective lens. The gap between the first collimate lens and the first objective lens is larger than the gap between the second collimate lens and the second objective lens. | 08-26-2010 |
| 20100238783 | OPTICAL PICKUP - An optical pickup of this invention includes a first objective lens for a CD or DVD, a second objective lens for a BD, a photodetector, a light source for a CD or DVD, a light source for a BD; a first optical mechanism for guiding first reflected light from the CD or DVD toward the photodetector via the first objective lens, and a second optical mechanism for guiding second reflected light from the BD via the second objective lens and changing the direction of the second reflected light toward the first optical mechanism. After the second reflected light joins a light path of the first reflected light guided by the first optical mechanism, the second reflected light is supplied by the first optical mechanism to the photodetector. | 09-23-2010 |
| 20100271927 | OPTICAL PICKUP, OPTICAL DISC APPARATUS, OPTICAL PICKUP MANUFACTURING METHOD, AND OPTICAL PICKUP CONTROL METHOD - An optical pickup includes: first and second objective lenses focusing light beams of different wavelengths on first and second optical discs having different thickness protection layers; a coma aberration generating unit generating coma aberration in the light beams; a collimating lens between a light source and the first objective lens; and a collimating lens driving unit. The protection layer thickness of the plastic first optical disc is smaller than that of the second optical disc. The first objective lens satisfies a lens tilt coma aberration sensitivity of 0 to 0.3[λrms/°]. An optical axis of the light beam approximately coincides with an optical axis of the first objective lens. The optical pickup is inclined to the optical disc so that initial coma aberration with respect to the first optical disc is optimally corrected. The coma aberration generating unit is used for obtaining optimal reproducing environment when reproducing the second optical disc. | 10-28-2010 |
| 20100315935 | OBJECTIVE LENS, OPTICAL PICK-UP DEVICE, AND OPTICAL DISK DEVICE - An optical pickup device includes light sources for respectively emitting a plurality of different wavelengths of light, a unit structured for causing at least a part of the light emitted from the light sources to pass a same optical path; and a focusing unit for focusing the light. The focusing unit includes at least first and second focusing parts, the first focusing part being to focus mainly a wavelength of light different from a wavelength of light to be mainly focused by the second focusing part. The optical pickup device and optical disk device are capable of realizing at least one of thickness reduction, size reduction and suppression against characteristic deterioration even where coping with various wavelengths of laser including a blue laser. | 12-16-2010 |
| 20100315936 | OBJECTIVE LENS, OPTICAL PICK-UP DEVICE, AND OPTICAL DISK DEVICE - An optical pickup device includes light sources for respectively emitting a plurality of different wavelengths of light, a unit structured for causing at least a part of the light emitted from the light sources to pass a same optical path; and a focusing unit for focusing the light. The focusing unit includes at least first and second focusing parts, the first focusing part being to focus mainly a wavelength of light different from a wavelength of light to be mainly focused by the second focusing part. The optical pickup device and optical disk device are capable of realizing at least one of thickness reduction, size reduction and suppression against characteristic deterioration even where coping with various wavelengths of laser including a blue laser. | 12-16-2010 |
| 20110069601 | OPTICAL ELEMENT, OPTICAL HEAD, OPTICAL INFORMATION DEVICE AND METHOD OF CONTROLLING OPTICAL HEAD - An optical head includes a laser light source of emitting laser, an objective lens which focuses the laser emitted from the laser light source on an optical recording medium and an optical element placed between the light source and the optical recording medium, of which the transmittance varies depending on a voltage applied. The voltage applied to the optical element is switched so that the optical element has a lower transmittance upon reproducing a signal on the optical recording medium than upon recording a signal on the optical recording medium, at times when recording a signal on the optical recording medium and when reproducing a signal on the optical recording medium. | 03-24-2011 |
| 20110149713 | OBJECTIVE LENS DRIVE DEVICE AND OPTICAL PICKUP - In an optical pickup equipped with a semiconductor laser, electro-optical components such as a lens, and an objective lens drive device, the objective lens drive device includes objective lenses, a holder holding the objective lenses, a focusing coil, and tracking coils. The focusing coil is wound in parallel to the optical surface of the objective lens, and formed in a parallelogram shape having inclined portions provided near the tracking coils. The two tracking coils are placed on diagonal portions of the lens holder. | 06-23-2011 |
| 20110182166 | OPTICAL PICKUP - An optical pickup that can be downsized is suggested. | 07-28-2011 |
| 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 |
| 20110199885 | Disk Unit - In this disk unit, a tray has an air intake opening formed to extend from an upstream side in a rotational direction of a disk rotated by a rotating portion toward an optical pickup and to extend inward from outside a receiving region from the upstream side toward a downstream side in the rotational direction for incorporating air into the side a receiving surface of the tray from the side of the back surface thereof. | 08-18-2011 |
| 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 |
| 20110299378 | Optical Pickup Having Radially Arranged Lenses in a Low Profile Construction - An optical pickup includes a first source which emits a first beam with a first wavelength; a second source which emits a second beam with a wavelength shorter than the first wavelength; a first collimate lens which collimates the first beam; a second collimate lens which collimates the second beam; a first objective lens which converges the first collimated beam onto an optical disc; and a second objective lens which converges the second collimated beam onto the disc. The first and second objective lenses are arranged in the disc radial direction. The second objective lens is arranged closer to the side of the disc outer circumference than the first objective lens. The first collimate lens is arranged on the right-hand side when the second objective lens is viewed from the first objective lens. The second collimate lens is arranged on the left-hand side when the first objective lens is viewed from the second objective lens. The gap between the first collimate lens and the first objective lens is larger than the gap between the second collimate lens and the second objective lens. | 12-08-2011 |
| 20110310722 | OPTICAL PICKUP - An optical pickup having a one-plane, two-wavelength diffraction grating and a two-wavelength laser generator is provided in which crosstalk noise caused by leakage of a track error signal into a focus error signal is reduced to improve focus control performance. A main beam and sub-beams generated by the one-plane, two-wavelength diffraction grating and reflected from the surface of an optical disc are incident on corresponding light receiving elements among which the one to receive the main beam and those to receive the sub-beams are relatively shifted in a linear-speed direction of the optical disc. The distance of the shifting is determined based on the characteristic, relative to the relative positions of the light receiving elements, of the leakage of the tracking error signal into the focus error signal detected based on the main beam and sub-beams. | 12-22-2011 |
| 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 |
| 20120082021 | OPTICAL PICKUP DEVICE - An optical pickup device, an optical drive using the same, and a method of forming a beam spot are provided. The optical pickup includes a light source system that includes a light source corresponding to at least one of a digital versatile disc (DVD) and a Blu-ray disc (BD). The light source forms a beam spot having an oval shape with a long axis and a short axis on an information recording track of the disc, and the light source is disposed such that the long axis is maintained at an angle ranging from 0° to 30° with respect to a radial direction passing through a rotation center of the disc. | 04-05-2012 |
| 20120147726 | OPTICAL HEAD AND OPTICAL INFORMATION DEVICE - Provided are an optical head and an optical information device capable of inhibiting the temperature rise of a photodetector. An optical head ( | 06-14-2012 |
| 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 |
| 20120201116 | OPTICAL PICKUP DEVICE AND OPTICAL PICKUP SUPPORTING DEVICE - In order to achieve further cost reduction while the package size of an optical pickup having two objective lenses and the restriction on the disposition of the two objective lenses are maintained, an optical system for laser light emitted from a red/infrared dual-wavelength laser diode is disposed such that a parallel plate beam splitter is disposed to be inclined with respect to the optical axis of focused light of the laser light reflected by an optical disk and the optical axis of the laser light between a rising mirror and the parallel plate beam splitter is inclined from the signal track direction of the optical disk. The laser light to which astigmatism is given by transmission through the parallel plate beam splitter is caused to be directly incident on a light detector without passing through an astigmatism adjustment optical element. | 08-09-2012 |
| 20120281518 | OPTICAL PICKUP - An optical pickup has an objective lens that is shared for light of three wavelengths. The effective diameter of the light that passes through the objective lens decreases in a sequence of the light of a first wavelength (light for a first optical disk), the light of a second wavelength (light for a second optical disk) and the light of a third wavelength (light for a third optical disk); and the light of the third wavelength is incident on the objective lens in a finite system. The objective lens is provided so that the focal distance of the light of the second wavelength is greater than the focal distance of the light of the first wavelength. | 11-08-2012 |
| 20130094341 | OPTICAL PICKUP AND OPTICAL DISK APPARATUS - According to one embodiment, an optical pickup configured to record and to reproduce on a layer of a disk, including, a light source configured to emit a laser beam, an objective lens including a variable use magnification and configured to focus the laser beam on the layer, a collimator lens configured to change the magnification of the objective lens by moving along an optical axis direction, and a liquid crystal module configured to generate spherical aberration to cancel a coma aberration which may occur because an object point and an image point of the objective lens at the use magnification do not exist on an optical axis of the objective lens. | 04-18-2013 |
| 20130194906 | OPTICAL PICKUP AND OPTICAL SYSTEM INCLUDING THE SAME - Provided are an optical pickup and an optical system employing the optical pickup. The optical pickup includes a twin light source. In various aspects, a length between the two light sources of a twin light source is reduced while the magnification of the optical pickup is increased, in comparison to a conventional optical pickup. Accordingly, a manufacturing cost of the optical pickup may be reduced. | 08-01-2013 |
| 20130279319 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE - An optical pickup device moves in a feed direction parallel to a radial direction of an optical disc rotating on an axis of rotation, and records or reproduces information on an information recording surface of the optical disc. The optical pickup device has a first light source that emits light of a first wavelength, a second light source that emits light of a second wavelength differing from the first wavelength, a first objective lens for focusing the light from the first light source onto the information recording surface, and a second objective lens for focusing the light from the second light source onto the information recording surface. The first and second objective lenses and the first light source are disposed in a plane that passes through the axis of rotation and is parallel to the feed direction. | 10-24-2013 |
| 20140140185 | PLAYBACK DEVICE AND PLAYBACK METHOD - There is provided a playback device including a light source, an objective lens that radiates light emitted onto an optical recording medium, and onto which is incident reflected light obtained from a recording surface of the optical recording medium, a condenser lens that condenses the reflected light, a photodetecting section configured to, provided that a confocal position is a focal position of the condenser lens, λ is a wavelength of light radiated onto the optical recording medium, and NA is a numerical aperture of the objective lens, extract and detect light within a range of a diameter less than 1.5λ/NA centered on an optical axis at the confocal position, and a phase difference imparting section that imparts a designated phase difference between a reflected light component from a readout track and a reflected light component from a track neighboring the readout track. | 05-22-2014 |
