Class / Patent application number | Description | Number of patent applications / Date published |
369112160 | Polarized or polarizing | 48 |
20080205246 | OPTICAL HEAD AND OPTICAL DISK DEVICE - An interference type optical head and an optical disk device that can easily adjust an optical path length difference of a couple of lights, ensure higher signal amplification effect, and are suitable for reduction in size are provided in order to improve a regeneration signal quality with amplification of signal in the case where reflectivity of each layer must be lowered and relative noise for the signal increases because read speed is high in a multilayer optical disk. In view of essentially improving an S/N ratio of the regeneration signal in high-speed rotation of a multilayer disk, a plurality of interference phases are generated and an optical system for differential calculation has been reduced in size with an angular selective polarization conversion element in the optical disk device for amplifying the signal with interference of the light not radiated to the disk with the reflected light from the disk. Moreover, adjustment of reflection mirror angle of the reference light is no longer required by using a corner cube prism as the reference light reflection mirror and highly accurate signal detection can also be realized with a simplified structure. | 08-28-2008 |
20080239927 | OPTICAL HEAD DEVICE - An optical head device may include a polarization conversion element disposed on a common optical path for guiding a first and a second laser beams to a common objective lens for converting the first and the second laser beams to a circularly polarized light from a linearly polarized light, and a ½-wavelength plate disposed on an optical path of the first laser beam from a first laser light source to the common optical path for adjusting a polarization plane direction of the first laser beam. A polarization plane direction of the first laser beam incident on the polarization conversion element from the first laser light source is adjusted by the ½-wavelength plate in a direction so that the linearly polarized light is converted into the circularly polarized light. | 10-02-2008 |
20080253264 | OPTICAL PICKUP DEVICE AND OPTICAL DISK APPARATUS - An optical pickup device according to an aspect of the present invention includes a rotary mechanism which rotates a half-wave plate in mechanical conjunction with drive of first and second collimator lenses. The rotary mechanism locates the half-wave plate at a first rotational position when the first collimator lens is located at a control operation position, and the rotary mechanism locates the half-wave plate at a second rotational position when the second collimator lens is located at the control operation position. When the rotational position of the half-wave plate is switched between the first rotational position and the second rotational position, a polarization direction of a laser beam is changed with respect to the polarization beam splitter to switch an optical path of the laser beam. | 10-16-2008 |
20080259768 | Optical pickup apparatus - There is provided an optical pickup apparatus in which the assembling workability such as chucking of an LD holder by an adjusting jig and spreading of adhesive can be improved. In the optical pickup apparatus, multiple fitting portions (boss portions) | 10-23-2008 |
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 |
20080304394 | OPTICAL PICKUP AND OPTICAL DISK APPARATUS - An optical pickup includes: a first light source that emits a first linearly polarized light beam; a second light source that emits a second linearly polarized light beam different from the first wavelength; a drive unit configured to selectively drive the light sources; a first light path along which the first light beam travels to an optical disk; a second light path along which the second light beam travels to the optical disk, the first and second light paths intersecting in the middle of the light paths and are combined into a third light path; a light path-combining optical element provided at the intersection of the first and second light paths; a light path-separating optical element provided along the third light path; a phase difference-imparting optical element provided along the third light path; and a light receiving element that receives the first and second light beams reflected off the optical disk. | 12-11-2008 |
20080310285 | Laminated Wave Plate and Optical Pickup Using the Same - A laminated wave plate having a wider bandwidth at a desired retardation is provided. | 12-18-2008 |
20090010136 | Beam Shaper for an optical storage system - The present invention relates to a beam shaper and to an apparatus for reading from and/or writing to optical storage media using in such a beam shaper. | 01-08-2009 |
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 |
20090059767 | Optical Pick-Up Apparatus and Information Record and Reproduction Apparatus - To reduce energy loss on an optical path and improve efficiency of using light volume of light source. A light beam in a P polarized state is emitted from a semiconductor laser | 03-05-2009 |
20090086610 | OPTICAL PICKUP APPARATUS, OPTICAL RECORDING MEDIUM DRIVING APPARATUS, AND SIGNAL RECORDING/REPRODUCING METHOD - An optical pickup apparatus capable of irradiating an optical recording medium having a plurality of recording layers on which a signal is recorded with laser light includes a light source emitting the laser light, a light-concentrating element concentrating the laser light emitted from the light source on the optical recording medium, a phase difference element having a region divided into at least two regions which the laser light reflected by the optical recording medium enters and producing a phase difference between first light and second light reflected by a non-target layer which is not a target of recording or reproduction of the signal out of the plurality of recording layers and entering the at least two regions such that the first and the second light weaken each other, and a photodetector receiving the laser light emitted from the phase difference element. | 04-02-2009 |
20090190460 | OPTICAL HEAD AND APPARATUS USING THE SAME - An optical head and an apparatus using the optical head are shown. The optical head includes a light-emitting element, a first polarized light diverging element for transmitting the light beam of a first polarization direction and reflecting the light beam of a second polarization direction orthogonal to the first polarization direction, a second polarized light diverging element for transmitting or reflecting the light beam of the first polarization direction, a converging element for converging the light beam on an information recording medium, a reflection element for reflecting a first reflected light beam reflected on the information recording medium and reflected on or transmitted through the second polarized light diverging element, and a detection element for detecting a second reflected light beam reflected on the reflection element and transmitted through or reflected on the second polarized light diverging element. | 07-30-2009 |
20090252019 | MICRO OPTICAL PICKUP APPARATUS - This invention discloses a micro optical pickup apparatus for providing an incident light to an optical recording medium, receiving a reflected light from the optical recording medium, and thereby accessing data of the optical recording medium. The micro optical pickup apparatus includes a light source generating element for producing the incident light, an axial light splitting element allowing the incident light to pass through and deflecting the reflected light according to polarization directions of the incident and reflected lights, a polarization element disposed between the axial light splitting element and the optical recording medium is capable of changing the polarization directions of the incident light and reflected light of the optical recording medium, an astigmatic mirror for receiving, astigmatism focusing and reflecting the reflected light from the axial light splitting element, and an optical sensing element for receiving the reflected light from the astigmatic mirror and converting the reflected light into a corresponding electric signal. | 10-08-2009 |
20090268585 | WAVELENGTH SELECTING WAVELENGTH PLATE AND OPTICAL HEAD DEVICE USING IT - An optical rotating plate has an optical rotating material layer. A phase plate is provided on a first surface side of the optical rotating plate and has at least one birefringent material layer. The first surface side is disposed toward an emitting side of an optical path, thereby giving different phase differences to a first linearly polarized light group containing at least a linearly polarized light having a first wavelength and a second linearly polarized light group containing at least a linearly polarized light having a second wavelength which is different from the first wavelength. | 10-29-2009 |
20100002559 | Compatible optical recording medium - The optical recording medium has a recording layer sensitive for recording at a first wavelength and sensitive for reading at a second wavelength, the recording layer having a groove structure, wherein at the first wavelength the groove structure has a diffraction efficiency into a first diffraction order sufficiently large to generate a push-pull signal, and at the second wavelength it has a diffraction efficiency into a first diffraciton order close to zero. The optical pickup for recording on an optical recording medium intended to be read with a second wavelength and a second numerical aperture is characterized in that it has a light source for generating a light beam at a first wavelength and a numerical aperture given by the second numerical aperture multiplied with a ration of the first wavelength and the second wavelength. | 01-07-2010 |
20100085860 | OPTICAL HEAD DEVICE, AND OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING METHOD USING THE SAME - Light outputted from a semiconductor laser ( | 04-08-2010 |
20100091632 | OPTICAL SYSTEM, OPTICAL PICKUP APPARATUS, AND OPTICAL DISK APPARATUS - The present invention discloses an optical system for extracting signal light components from a beam including the signal light components and stray light components. The optical system includes a condensing optical element situated on an optical path of the beam for condensing the beam, a polarization changing unit for changing the state of polarization of at least one of the signal light components and the stray light components included in the incident beam transmitted through the condensing optical element, and an extracting element for extracting the signal light components included in the beam transmitted through the polarization changing unit. | 04-15-2010 |
20100220577 | OPTICAL HEAD DEVICE, OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE, AND OPTICAL INFORMATION RECORDING/REPRODUCING METHOD - Polarization direction switching elements do not change the polarization direction of incoming light, in the case where a disc is an optical recording medium conforming to the HD DVD standards. At this time, light outputted from a semiconducted laser is collected on the disc by an objective lens, and reflection light from the disc is received by a light detector. In the case where the disc is an optical recording medium conforming to the BD standards, the polarization direction switching elements change the polarization directed of the incoming light by ninety degrees. At this time, light outputted from the semiconductor laser is collected on the disc by the objective lens, and reflection light from the disc is received by the light detector. Liquid crystal lenses correct spherical aberrations on an outgoing path and a returning path. | 09-02-2010 |
20110002215 | OPTICAL PICKUP DEVICE AND OPTICAL INFORMATION PROCESSING APPARATUS USING THE OPTICAL PICKUP DEVICE - An optical pickup device is disclosed. In the optical pickup device, S-polarized light is input to a polarization filter from a DVD light source or a CD light source. Since the polarization filter transmits through the S-polarized light and diffracts P-polarized light, the S-polarized light is transmitted through the polarization filter. The S-polarized light is converted into three beams by being diffracted by a diffraction element. The three beams reflected at a polarization beam splitter are converted into circularly polarized light by a ¼ wavelength plate via a collimate lens, and the circularly polarized light is condensed on an optical recording medium via an objective lens. Light reflected from the optical recording medium is converted into linear P-polarized light by the | 01-06-2011 |
20110026390 | OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE, OPTICAL UNIT, AND OPTICAL INFORMATION RECORDING METHOD - An optical unit is provided with a light source; a light dividing means for dividing light emerging from the light source into a first light and a second light; a light converging means for converging the first and second lights at the same position in the recording layer in the manner that they face each other; a polarization state switching means for switching the polarization states of the first and second lights at the convergence point in the recording layer; and a light irradiation state switching means for switching between the state in which the optical cording medium is irradiated with both the first light and the second light and the state in which the optical recording medium is irradiated with only one of the first and second lights. | 02-03-2011 |
20110170397 | Optical Pickup Apparatus - An optical pickup apparatus comprising: a laser light source configured to emit a laser beam; an objective lens configured to apply the laser beam to an optical recording medium; and a beam splitter including a first reflective film configured to reflect the laser beam so as to be directed to the objective lens, the beam splitter interposed in an optical path between the laser light source and the objective lens, an incidence polarization angle of the laser beam relative to the first reflective film being set such that a P-polarization component is greater than an S-polarization component in linear polarization components of the laser beam incident on the first reflective film. | 07-14-2011 |
20110205880 | OPTICAL BEAM FORMING APPARTUS - An optical beam forming apparatus capable of forming a polarization of laser beam into an elliptic polarization includes a beam source to emit a semiconductor laser beam, a wave plate to receive the beam emitted from the beam source and to form an elliptic polarization, and a lens to focus the beam passed through the wave plate to form a beam spot on a disc. | 08-25-2011 |
20110235495 | OPTICAL HEAD AND OPTICAL RECORDING/REPRODUCING APPARATUS - Certain embodiments provide an optical recording/reproducing apparatus including: a slider that has a medium facing surface that faces an optical recording medium, and moves along a recording/reproducing face of the optical recording/reproducing medium; a metal nanoparticle structure that is provided in the medium facing surface of the slider; a light illumination device that illuminates the optical recording medium and the metal nanoparticle structure with light that has polarization components in a direction perpendicular to the recording/reproducing face; and a detection device that detects Rayleigh scattering light that is generated from a portion of the optical recording medium and is intensified by the metal nanoparticle structure, the portion being located close to the metal nanoparticle structure. | 09-29-2011 |
20120075980 | HIGH-RESOLUTION READ HEAD FOR AN OPTICAL DISK - The instant disclosure relates to a high resolution read head for an optical disk, including a monochromatic laser source; a radial polarization polarizer; an annular diaphragm that is opaque at the center and periphery thereof; an optical system for shaping the beam; and a light-concentrating microcomponent including a hemispherical lens, at the focal point of which a nanowire is arranged, and which is orthogonal to the plane of said lens, said nanowire being capped with a metal half-bead. | 03-29-2012 |
20120099413 | Compound quarter-wave retarder for optical disc pickup heads - Chemically-bonded laminated polymer achromatic polarization devices, such as circular polarizers, are disclosed for use in optical disc (e.g., CD/DVD) pickup heads. Chemically-bonded laminated polymer achromatic polarization devices have the benefit of providing stable retardation and optic axis over an extended wavelength range, thereby ensuring orthogonal polarization in double-pass for two or more laser wavelengths. Moreover, the chemically-bonded laminated polymer achromatic polarization devices can be symmetric in construction, such that there is no specific input and output side. This alleviates the need to produce geometries that prohibit inversion of the part when installed in the system. Manufacturing processes that produce chemically-bonded laminated polymer achromatic polarization devices, with high light efficiency, durability and robust performance in a variety of environmental conditions are disclosed. | 04-26-2012 |
20120134254 | OPTICAL PICKUP APPARATUS - Provided is an optical pickup apparatus that stably operates by accurately detecting a fluctuation in a light amount of a laser beam caused by movement of a collimating lens. In an optical pickup apparatus of the present invention, part of a laser beam emitted from a laser device is transmitted through a reflective mirror and detected by a laser beam FMD. An output of the laser device is adjusted based on the output from the FMD. Even when a collimating lens moves during the operation of the apparatus, the change in the light amount of the laser beam caused by the movement is immediately detected by the FMD and the output of the laser device is adjusted. Thus, the light amount of the laser beam radiated on an optical information recording medium is kept constant along a time axis. Accordingly, the optical pickup apparatus can stably perform reading and writing. | 05-31-2012 |
20120176881 | OPTICAL PICKUP DEVICE AND OPTICAL DISC APPARATUS APPLYING THE SAME - An optical pickup device is provided. The device includes a semiconductor laser light source which outputs linearly-polarized light having an elliptical shape, an objective lens which focuses light outputted from the semiconductor laser light source, forming an optical spot on an optical disc; and a polarization plate which is disposed placed on an optical path between the semiconductor laser light source and the objective lens, and which polarizes the light outputted from the semiconductor laser light source and transmits elliptically-polarized light, wherein the polarization plate is disposed such that a major axis of the elliptical polarization of the light transmitted by the polarization plate is parallel to or perpendicular to a major axis of the elliptical shape of the light. | 07-12-2012 |
20120201114 | OPTICAL PICKUP, OPTICAL RECORDING/REPRODUCING DEVICE, COMPUTER, OPTICAL DISK RECORDER, AND MINUTE SPOT FORMING METHOD - An optical pickup, an optical recording/reproducing device, a computer, an optical disk recorder, and a minute spot forming method that can enable light propagation with a high transmittance and can form a minute spot. The optical pickup includes a wavelength plate ( | 08-09-2012 |
20120207007 | REFLECTION TYPE WAVELENGTH PLATE AND OPTICAL HEAD DEVICE - A phase difference layer | 08-16-2012 |
20120257489 | RECORDING/REPRODUCING APPARATUS AND RECORDING/PRODUCING SYSTEM - A recording/reproducing apparatus includes an optical source and a near-field light generating unit. The near-field light generating unit includes two conductors facing to each other at a predetermined distance and generating near-field light between the two conductors by irradiation of light from the optical source. These two conductors are arranged so that a direction along which the two conductors face to each other is substantially in parallel with the longitudinal direction of a recording mark region. Here, the recording mark region is prepared from a predetermined recording material and having shape anisotropy when information is recorded on a recording medium on which the recording mark is independently formed. | 10-11-2012 |
20130135982 | OPTICAL INFORMATION REPRODUCTION DEVICE, OPTICAL INFORMATION REPRODUCTION METHOD, AND INFORMATION RECORDING MEDIUM - An optical information reproduction device includes a light source ( | 05-30-2013 |
20140010064 | OPTICAL PICKUP DEVICE AND OPTICAL DISK DRIVE INCLUDING THE SAME - Provided are an optical pickup device and an optical disk drive including the same. The optical pickup device includes a quarter-wave plate (QWP) that is disposed parallel to an objective lens and a reflection mirror that reflects a beam back onto the QWP after the beam passed through the QWP. The optical pickup device also includes a polarization mirror that is disposed between the objective lens and the QWP, and which reflects the beam which is generated from a light source onto the QWP, and allows the beam reflected by the reflection mirror to pass through to the objective lens. | 01-09-2014 |
369112170 | Plural distinct polarized optical elements | 8 |
20080205247 | Multi-Radiation Beam Optical Scanning Device - An optical scanning device for scanning an information layer ( | 08-28-2008 |
20080298210 | OPTICAL PICKUP AND OPTICAL DISC APPARATUS - An optical pickup free from tracking error signal variation when playing back a double-layered disc, and coping with incompatible optical discs, such as BDs and HD DVDs, includes a laser light source, a first polarization rotation element for rotating a polarization direction of an optical beam from the source, an optical branching element disposed in a position after the polarization rotation element to reflect or transmit an optical beam according to polarization of the beam, first and second object lenses for focusing the reflected and transmitted optical beams onto first and second optical discs, respectively, a photodetector for sensing reflected light from the first and second optical discs, and a second polarization rotation element disposed after reflection or transmission of the reflected light from the first and second optical discs conducted by the branching element, to rotate a polarization direction of the reflected light. | 12-04-2008 |
20090129237 | BEAM SHAPING MODULE - A beam shaping module capable of receiving a polarized beam from a light source is disclosed, which comprises: a beam splitter, capable of splitting the polarized beam into a first beam and a second beam wherein the polarization directions of the first beam and the second beam are perpendicular to each other; and a beam combiner, capable of shaping and combining the first beam and the second beam; wherein the beam combiner is configured to reverse the energy distribution pattern of one of the first beam and the second beam. | 05-21-2009 |
20100110862 | Optical information storage medium and optical information storage medium reproducing apparatus - An optical information storage medium includes a light transmitting layer, a first information storage layer, an intermediate layer mainly made of resin, a second information storage layer, and a substrate. The light transmitting layer, the first information storage layer, the intermediate layer, the second information storage layer, and the substrate are layered in this order from a reproduction light incident side. Each of the first information storage layer and the second information storage layer includes: a light absorbing film that absorbs reproduction light to generate heat; and a reproduction film that is heated by the heat generated by the light absorbing film so as to reproduce a signal shorter in mark length than a resolution limit of an optical system of a reproducing apparatus. | 05-06-2010 |
20110188368 | OPTICAL INFORMATION RECORDING/REPRODUCTION METHOD AND DEVICE - It is possible to provide a new information recording/reproduction method and a device which can realize a small-size large-capacity memory having a characteristic equivalent to or higher than a hologram memory. The optical information recording/reproduction device includes: recording light generator ( | 08-04-2011 |
20110194397 | OPTICAL PICKUP DEVICE - An optical pickup device has a DVD/CD laser diode for emitting a DVD/CD laser beam as linear polarized light, and a BD laser diode for emitting a BD laser beam. The optical pickup device has a dichroic mirror that regularly reflects a part of the DVD/CD laser beam, transmits a part of the DVD/CD laser beam, and transmits return light of the BD laser beam. The dichroic mirror is formed so that a product of reflectance of outward light of the DVD/CD laser beam and transmittance of return light of the DVD/CD laser beam becomes 20% or more to 25% or less. A light receiving element receives the return light of the DVD/CD laser beam transmitted through the dichroic mirror or the return light of the BD laser beam transmitted through the dichroic mirror. | 08-11-2011 |
20120008483 | OPTICAL HEAD AND OPTICAL DISC APPARATUS - Reference light for interference with signal light from an optical information recording medium is displaced and reflected by a corner cube prism or the like with high accuracy. The signal light and the displaced reference light are made parallel with each other with high accuracy. The signal light and the reference light are each split using a polarization splitter to generate interference light. Thus, regeneration signals are stabilized. Accordingly, an interference-type optical head and optical disc apparatus of higher quality than conventional ones can be provided. | 01-12-2012 |
20130194905 | OPTICAL PICKUP AND OPTICAL DISK DEVICE USING OPTICAL PICKUP - In an optical pickup for an optical disk device using BD, DVD and CD as recording media, simplification of constitutional elements is promoted. The optical pickup includes a dual wavelength type laser beam source generating laser beams for DVD and CD, a single wavelength type laser beam source generating a laser beam for BD, and a first wave plate converting the laser beam for BD generated from the laser beam source concerned into circular polarization. It further includes a second wave plate converting the laser beam for DVD generated from the dual wavelength type laser beam source into 45-degree linear polarization. Favorable recording and reproduction are performed by radiating the laser beam to the recording medium concerned as the circular polarization for BD and the 45-degree linear polarization for DVD. | 08-01-2013 |
369112180 | Sectioned optical element | 8 |
20090262629 | OPTICAL HEAD, OPTICAL DISC DEVICE AND INFORMATION RECORDING AND/OR REPRODUCING DEVICE - An optical head is provided with a light source for emitting a first laser beam having a first wavelength shorter than 430 nm, a two-wavelength light source for emitting a second laser beam having a second wavelength equal to or longer than 430 nm, a flat beam splitter in the form of a single plate for reflecting the first laser beam emitted from the light source, a wedge prism in the form of a single plate for reflecting the first laser beam reflected by the flat beam splitter and transmitting the second laser beam emitted from the two-wavelength light source, and an objective lens for focusing the first laser beam reflected by the wedge prism on an information recording surface of a BD. The light source is arranged such that the optical axis of the first laser beam emitted from the light source is inclined with respect to that of the second laser beam emitted from the two-wavelength light source. By this construction, the miniaturization of the optical head can be realized. | 10-22-2009 |
20110249546 | Nano-Fabricated Plasmonic Optical Transformer - The present invention provides a plasmonic optical transformer to produce a highly focuses optical beam spot, where the transformer includes a first metal layer, a dielectric layer formed on the first metal layer, and a second metal layer formed on the dielectric layer, where the first metal layer, the dielectric layer, and the second layer are patterned to a shape including a first section having a first cross section, a second section following the first section having a cross-section tapering from the first section to a smaller cross-section, and a third section following the second section having a cross-section matching the tapered smaller cross-section of the second section, | 10-13-2011 |
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 |
369112190 | Plural polarizing sections | 3 |
20080253265 | OPTICAL HEAD APPARATUS - The present invention provides an optical head apparatus having: a light source emitting a linearly-polarized light; an objective lens focusing a light source light emitted from the light source on an optical recording medium; a light detector receiving a return light generated by reflecting the light source light by the optical recording medium; and a variable diffraction device having: a first polarized light diffraction grating; and a second polarized light diffraction grating, the variable diffraction device: diffracting an incident light of the linearly-polarized light by one of the first polarized light diffraction grating and the second polarized light diffraction grating; and transmitting the incident light without diffraction by the other thereof, the first polarized light diffraction grating having: first stripes including an anisotropic transparent material; and second stripes including an isotropic transparent material, the first stripes and the second stripes being alternately arranged in a first direction and in a first pitch to fill each space; the second polarized light diffraction grating having: third stripes including an anisotropic transparent material; and fourth stripes including an isotropic transparent material, the third stripes and the fourth stripes being alternately arranged in a second direction and in a second pitch to fill each space; the first polarized light diffraction grating and the second polarized light diffraction grating being different in at least one of the pitches and the directions, the variable diffraction device being capable of switching: either the first polarized light diffraction grating or the second polarized light diffraction grating diffracting the incident light; and the other thereof transmitting the incident light without diffraction by changing refractive indices sensed by the incident light with respect to the first polarized light diffraction grating and the second polarized light diffraction grating by an externally applied electric signal. | 10-16-2008 |
20120075981 | OPTICAL PICKUP DEVICE - Two light flux areas are disposed in a direction along which a pair of vertically opposite angles defined by first and second straight lines are aligned, and the other two light flux areas are disposed in a direction along which the other pair of vertically opposite angles are aligned. A spectral element sets propagating directions of divided elements of each of light fluxes obtained by dividing each of the light fluxes by a third straight line intersecting with the first and second straight lines by an angle of 45 degrees, or by a fourth straight line orthogonal to the third straight line to disperse the divided elements on a photodetector. The photodetector is provided with sensors which individually receive the divided elements of the light fluxes. | 03-29-2012 |
20120120785 | Optical Pickup Device - Provided is an optical pickup device which suppresses the decrease of light amount and performs conversion to circular polarization light, wherein the optical pickup device includes a beam splitter and a raising mirror on each of which a layered member is formed, and the optical pickup device satisfies conditional expressions relating to intensities of S-polarized light and P-polarized light with respect to the beam splitter of a laser beam emitted from a semiconductor laser element, reflecances of S-polarized light and P-polarized light on the beam splitter, a reflection phase difference obtained by subtracting a phase of S-polarized light from a phase of P-polarized light after the reflection, reflectances of S-polarized light and P-polarized light on the raising mirror, and a reflection phase difference obtained by subtracting a phase of S-polarized light from a phase of P-polarized light after the reflection. | 05-17-2012 |
369112200 | Lens section | 1 |
20100202272 | METHOD OF FABRICATING NANOROD INFORMATION STORAGE MEDIUM - A method of fabricating an information storage medium, the method including forming a plurality of nanorod recording layers on a substrate by sputtering using a mask having a plurality of nanorod patterns. | 08-12-2010 |
369112210 | Prism, mirror, or waveguide section | 1 |
20130182550 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus includes: a laser light source to emit a laser beam; an object lens to irradiate an optical recording medium with the laser beam; a photodetector to receive a reflected light of the laser beam reflected by the optical recording medium; a semitransparent mirror interposed on an optical path between the laser light source and the object lens, to reflect the laser beam in a direction of the object lens and transmit it in a direction of the photodetector; and an astigmatism adding member interposed on an optical path between the semitransparent mirror and the photodetector, to add astigmatism to the reflected light, wherein the astigmatism adding member includes control film having first transmittance for polarization component in first direction contained in the reflected light is substantially equal to second transmittance for polarization component in second direction perpendicular to the first direction contained in the reflected light. | 07-18-2013 |