Polarized Or Polarizing Patents (Class 369/112.16)
  • Patent number: 10802189
    Abstract: A wire grid polarizer and a display panel using the same are provided. The wire grid polarizer includes a substrate, a plurality of wire grids, a plurality of patterned light absorbing layers, and a surface covering layer. The plurality of wire grids are disposed on the substrate, wherein there are a plurality of gaps between every two wire grids. The plurality of patterned light absorbing layers are disposed corresponding to and overlapping the wire grids respectively, wherein every two of the patterned light absorbing layers have one of the gaps. The surface covering layer is disposed on the patterned light absorbing layers and directly contacts the patterned light absorbing layers.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: October 13, 2020
    Assignee: AU OPTRONICS CORPORATION
    Inventors: Huang-Kai Shen, Sheng-Ming Huang, Jen-Kuei Lu, Chih-Chiang Chen, Hui-Ku Chang, Tsai-Sheng Lo, Chia-Hsin Chung, Wei-Chi Wang, Sheng-Kai Lin, Ming-Jui Wang
  • Patent number: 10634881
    Abstract: An optical magnification system comprises two Pancharatnam lenses, and provides a first magnification for left-hand circularly polarized light and a second magnification different from the first magnification for right-hand circularly polarized light. An optical magnification system comprises two lenses, each having different focal lengths for left-handed and right-handed circularly polarized light, respectively, and configured to provide a first magnification for left-handed circularly polarized light and a second magnification different from the first magnification for right-handed circularly polarized light.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: April 28, 2020
    Assignee: Kent State University
    Inventors: Kun Gao, Hsien-Hui Cheng, Philip Bos, Colin P. McGinty, Achintya Bhowmik
  • Patent number: 9991964
    Abstract: Embodiments described herein include a multichannel transmitter optical subassembly that includes a plurality of lasers and a signal combiner. The plurality of lasers may be configured to emit light each with a different one of a plurality of light signals, each of the plurality of light signals having a wavelength within one of a plurality of wavelength bands. The signal combiner may be disposed relative to the plurality of lasers to receive the plurality of light signals. The signal combiner may include at least one surface having an optical coating that reflects at least one of the light signals of the plurality of light signals and transmits at least one of the light signals of the plurality of light signals.
    Type: Grant
    Filed: March 10, 2016
    Date of Patent: June 5, 2018
    Assignee: FINISAR CORPORATION
    Inventors: Tengda Du, Xiaojie Xu
  • Patent number: 9945697
    Abstract: A measurement scale device includes at least one scale marking, wherein the or each scale marking includes at least one periodic nanostructure that represents scale device information.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: April 17, 2018
    Assignee: RENISHAW PLC
    Inventors: Matthew Donald Kidd, Nicholas John Weston, James Reynolds Henshaw, Marcus Ardron, John Dardis, Robert Thomson
  • Patent number: 9841300
    Abstract: A measurement scale device includes at least one scale marking, wherein the or each scale marking includes at least one periodic nanostructure that represents scale device information.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: December 12, 2017
    Assignee: RENISHAW PLC
    Inventors: Matthew Donald Kidd, Nicholas John Weston, James Reynolds Henshaw, Marcus Ardron, John Dardis, Robert Thomson
  • Patent number: 9568767
    Abstract: A display apparatus may include a backlight assembly configured to generate an emitted light and a display panel configured to receive the emitted light to display images. The display panel may include a display substrate, an opposite substrate facing the display substrate, a wire grid polarizer, and a reflection reducing layer. The wire grid polarizer may be disposed on at least one of the display substrate and the opposite substrate to polarize the emitted light. The reflection reducing layer may have a grid shape and may be disposed on the wire grid polarizer. The reflection reducing layer may reduce an amount of a light reflected by the wire grid polarizer.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: February 14, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Jung Gun Nam, Moonjung An, Dae-Young Lee, Daehwan Jang, Gugrae Jo, Takakuwa Atsushi
  • Patent number: 9164307
    Abstract: A polarizer includes a first grating and a second grating. The second grating contains at least one of chromium nitride, tungsten nitride, and tantalum nitride.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: October 20, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Yoshitomo Kumai
  • Patent number: 9013965
    Abstract: 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.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: April 21, 2015
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventors: Ji-sun Ahn, Ui-yol Kim
  • Patent number: 8964517
    Abstract: An optical system capable of obtaining a high-resolution image using interference and thus capable of providing a stable signal is realized. A particular polarization state of response light emitted from an object is selected, and light in the selected particular polarization state is split into two beams. The split two beams are polarized into two different polarization states. After one of the two beams is subjected to an image inversion, the two beams are condensed such that they interfere with each other. The interfering light is split into a plurality of beams, and each of these beams is detected after they are passed through different polarizing filters. Detected signals are combined together and processed to obtain high-stability amplitude information without being influenced by a phase difference between the two beams.
    Type: Grant
    Filed: January 6, 2012
    Date of Patent: February 24, 2015
    Assignee: Hitachi, Ltd.
    Inventor: Shigeharu Kimura
  • Patent number: 8905805
    Abstract: A U-shaped groove and a V-shaped groove are formed onto a cladding disposed on a substrate, a core and a metal structure are formed inside the grooves, respectively, and then the substrate surface is planarized. Further, after a cladding is formed again, the substrate is cut and the cut surface is polished such that the metal structure inside the V-shaped groove has a predetermined thickness, thereby forming a scattering body.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: December 9, 2014
    Assignee: Seiko Instruments Inc.
    Inventors: Yoko Shinohara, Norio Chiba, Manabu Oumi, Masakazu Hirata, Sachiko Tanabe, Yoshikazu Tanaka
  • Patent number: 8792317
    Abstract: A system and method for providing direct read after write functionality in an optical data storage device include an optical head having a first coherent light source modulated at higher power during writing of data to the optical medium and a second coherent light source operating in a continuous wave mode at lower power while the first coherent light source is writing data. Optic components combine light from the first and second light sources and focus light from the first coherent light source to a first spot of a selected track on the optical medium and focus light from the second coherent light source to a second spot on the selected track downstream from the first spot relative to movement direction of the optical medium to read and verify the data directly after writing during the write process rather than in a separate verification process.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: July 29, 2014
    Assignee: Oracle International Corporation
    Inventor: Scott D Wilson
  • Patent number: 8730775
    Abstract: Multi-level recording is quite effective for attaining a larger capacity and a higher transfer rate in the case of an optical disk; however, with conventional technologies, a SIGNAL-TO-NOISE RATIO of a signal deteriorates along with an increase in a multi-level degree, creating a factor for limitations to the multi-level degree. In order to solve problems, when optical information is recorded by use of a standing wave occurring due to interference between two light beams, at least one of the two light beams is modulated in multi-stages. Further, at the time of regeneration, a regeneration reference beam is caused to interfere with respective polarization components of a regeneration beam, the polarization components being orthogonal to each other, thereby concurrently generating not less than three interference beams differing in interference phase from each other before being detected.
    Type: Grant
    Filed: January 6, 2011
    Date of Patent: May 20, 2014
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventor: Hideharu Mikami
  • Patent number: 8675465
    Abstract: An optical pickup device, an optical disk drive and method of controlling light performed by the optical pickup device are provided. The optical pickup device includes: a light transmitting system including an object lens for facing a medium having a multi recording layer for storing information, a light source system for providing a plurality of beams used to record information on or reproduce information from the multi recording layer via the light transmitting system, a light-receiving system disposed on a path of a beam reflected from the medium, and a light controller including a light control device for controlling stray light generated in the medium such that the stray light does not reach the light-receiving device.
    Type: Grant
    Filed: July 7, 2011
    Date of Patent: March 18, 2014
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventors: Ui-yol Kim, Yong-jae Lee
  • Publication number: 20140010064
    Abstract: 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.
    Type: Application
    Filed: June 28, 2013
    Publication date: January 9, 2014
    Inventors: Ji-sun AHN, Ui-yol KIM
  • Publication number: 20130235708
    Abstract: A system and method for providing direct read after write functionality in an optical data storage device include an optical head having a first coherent light source modulated at higher power during writing of data to the optical medium and a second coherent light source operating in a continuous wave mode at lower power while the first coherent light source is writing data. Optic components combine light from the first and second light sources and focus light from the first coherent light source to a first spot of a selected track on the optical medium and focus light from the second coherent light source to a second spot on the selected track downstream from the first spot relative to movement direction of the optical medium to read and verify the data directly after writing during the write process rather than in a separate verification process.
    Type: Application
    Filed: March 9, 2012
    Publication date: September 12, 2013
    Applicant: ORACLE INTERNATIONAL CORPORATION
    Inventor: Scott D. Wilson
  • Patent number: 8514685
    Abstract: Optical devices based on internal conical refraction for developing new set-ups, methods and applications based on the specific properties of internal conical diffraction. The devices include several set-ups, methods and applications consisting of biaxial crystal(s)—one or more polarization elements and optical elements. The biaxial crystal is an optical crystal which may belong to the trigonal, orthorhombic or trigonal crystal classes.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: August 20, 2013
    Assignee: BioAxial SAS
    Inventor: Gabriel Y. Sirat
  • Patent number: 8509040
    Abstract: An optical pickup device includes a polarization diffraction grating to diverge an optical beam reflected from an optical disc and an optical detector to receive the optical beam diverged by the polarization diffraction grating, a polarization of 0 order diffracted light diffracted through the polarization diffraction grating is substantially perpendicular to that of a +1 order diffracted light diffracted therethrough, and a polarization filter having a plurality of domains is mounted between the polarization diffraction grating and the optical detector.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: August 13, 2013
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventor: Kazuyoshi Yamazaki
  • Patent number: 8503279
    Abstract: The invention relates to a method of optical six-dimensional data storage and the apparatus based on it. This invention uses multiple beams with different wavelengths, encoded intensities and polarizations to create each group of multiple wavelength selective, reflectivity specified and polarization sensitive tiny plane or quasi-plane Bragg reflectors in a small volume crossing through multiple storage medium layers as each storage cell. The maximum storage capacity can over 10 Terabytes per disk with fast data write, read and erase speeds. In addition, the apparatus based on this method has no interlayer noise and disk rotation caused data recoding and reading quality loss, and has good compatibility with existing CD and DVD disks.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: August 6, 2013
    Inventor: Shangqing Liu
  • Publication number: 20130135982
    Abstract: An optical information reproduction device includes a light source (14) configured to emit reproduction light, a plasmon resonance element (9) including a resonance section (22) arranged adjacent to a recording region (4) of a recording layer (2), the resonance section (22) causing plasmon resonance between the recording region (4) and the resonance section (22), a photodetector (17a) configured to detect reflected light or transmitted light from the plasmon resonance element (9) on which the reproduction light is irradiated, and a reproduction unit (24) configured to determine, on the basis of a detection signal from the photodetector (17a), whether the recording region (4) is in a recorded state or an unrecorded state, and reproduce information recorded in the recording region (4).
    Type: Application
    Filed: August 18, 2011
    Publication date: May 30, 2013
    Inventors: Teruhiro Shiono, Yoshiharu Kobayashi
  • Patent number: 8441908
    Abstract: 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, reflectances 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.
    Type: Grant
    Filed: July 6, 2010
    Date of Patent: May 14, 2013
    Assignee: Konica Minolta Opto, Inc.
    Inventors: Hidetaka Jidai, Iwao Usui
  • Patent number: 8406102
    Abstract: An optical pickup includes: a light source; a first diffractive element which diffracts light polarized in a particular direction; an objective lens; a lens actuator which shifts the objective lens so that the magnitude of shift from its initial position in a tracking direction has an upper limit of 0.3 mm to 0.6 mm; a wave plate; a second diffractive element which has two diffraction regions configured to diffract light polarized in a direction that intersects with the particular direction at right angles and which splits the write beam reflected from the optical storage medium through each diffraction region into a transmitted light beam and at least one diffracted light beam; and a photodetector which detects the transmitted light beam, the diffracted light beams that have left the two diffraction regions, and the read beam reflected from the optical storage medium.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: March 26, 2013
    Assignee: Panasonic Corporation
    Inventors: Yohichi Saitoh, Jun-ichi Asada, Kazuo Momoo, Hideki Hayashi
  • Patent number: 8385182
    Abstract: 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 secon
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: February 26, 2013
    Assignees: Sanyo Electric Co., Ltd., Sanyo Optec Design Co., Ltd.
    Inventors: Yuki Koshimizu, Hiroyuki Ichikawa
  • Patent number: 8351316
    Abstract: A beam shaper has a beam shaping element with an optical property that varies spatially over the profile of an incoming light beam in order to generate a first shaped light beam from the incoming light beam.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: January 8, 2013
    Assignee: Thomson Licensing
    Inventor: Joachim Knittel
  • Patent number: 8331207
    Abstract: For use with a multi-layer optical disc, an optical pickup can eliminate a problem of causing a focus error signal and a tracking error signal to fluctuate due to interference of a signal light beam with a return light beam from another recording surface of a multi-layer optical disc during reproduction with an optical pickup that produces a tracking error signal and a focus error signal from a difference signal based on polarized reflected light.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: December 11, 2012
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Katsuhiko Izumi, Kazuyoshi Yamazaki, Tomoto Kawamura, Kunikazu Ohnishi
  • Patent number: 8320226
    Abstract: A disclosed optical element includes three or more sub-wavelength convexo-concave structures having pitches less than a wavelength of an incident light incident to the optical element and having groove depths equal to each other and a periodic structure having the three or more sub-wavelength convexo-concave structures, the pitch of the periodic structure greater than the wavelength of the incident light, in which a predetermined polarization direction of the incident light is diffracted mainly into a specific order.
    Type: Grant
    Filed: November 26, 2009
    Date of Patent: November 27, 2012
    Assignee: Ricoh Company, Ltd.
    Inventor: Hideaki Hirai
  • Patent number: 8315140
    Abstract: 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.
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: November 20, 2012
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Minoru Sato, Kiyotaka Eizumi, Chiaki Asakawa
  • Publication number: 20120257489
    Abstract: 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.
    Type: Application
    Filed: June 21, 2012
    Publication date: October 11, 2012
    Applicant: SONY CORPORATION
    Inventor: Kazuhiro HONGO
  • Publication number: 20120207007
    Abstract: A phase difference layer 12 and a reflection layer 13 are provided. Then, adjustment is performed such that the phase difference layer 12 and the reflection layer 13 impart a predetermined phase difference to light having a particular wavelength bandwidth or plural kinds of light of different wavelengths that enter in an oblique direction relative to the normal direction of the plane of the phase difference layer 12. By virtue of this, the light 16a that goes forward and backward through the phase difference layer 12 and then exits the layer has an ellipticity ? of 0.7 or greater. Thus, in particular, when this wave plate is employed in an optical head device, the function of reflection and the function of a ¼-wave plate are integrated. Thus, stable recording and reproduction of an optical disk are achieved, and size reduction is achieved in the optical head device.
    Type: Application
    Filed: April 19, 2012
    Publication date: August 16, 2012
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Koji MIYASAKA, Takuji NOMURA, Mamoru ISOBE
  • Patent number: 8243574
    Abstract: The invention relates to the writing and optical reading of high-density information. The higher energy density at the center of the reading laser beam is used for modifying the energy structure of an active layer in such a way as to make it capable of bearing surface plasmons. The coupling of the laser beam and the active layer thus modified can then excite surface plasmons in an interface between a dielectric layer and the active layer. These surface plasmons are disturbed by physical marks having very small dimensions and written in the optical storage medium; these disturbances generate a remote-field optical response which can be detected by a detector. The operation is carried out in super-resolution, the surface plasmons being generated only at the center of the laser beam and not at the periphery. It is therefore possible to write and to read again marks having dimensions of size smaller than the theoretical resolution of the optical reading system.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: August 14, 2012
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Salim Mimouni, Fabien Laulagnet
  • Publication number: 20120201114
    Abstract: 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 (202) that converts the polarization state of the light beam emitted from a semiconductor laser (101) and an objective lens optical system (105) that converges the light beam whose polarization state has been converted with a numerical aperture greater than 1. The wavelength plate (202) generates a light beam having a polarization state that differs depending on location. The polarization distribution of the light beam generated by the wavelength plate (202) is axially symmetric with respect to the optical axis of the light beam as an axis of symmetry. A light ray on the light axis is a circularly polarized light. Part of a light ray other than the light ray on the optical axis is an elliptically polarized light with an ellipticity of less than 1.
    Type: Application
    Filed: October 20, 2010
    Publication date: August 9, 2012
    Inventor: Kousei Sano
  • Patent number: 8238219
    Abstract: 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.
    Type: Grant
    Filed: April 20, 2009
    Date of Patent: August 7, 2012
    Assignee: NEC Corporation
    Inventors: Shin Tominaga, Ryuichi Katayama
  • Publication number: 20120176881
    Abstract: 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.
    Type: Application
    Filed: November 23, 2011
    Publication date: July 12, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Seong-su PARK, Soo-han PARK, Jung-woo HONG, Se-june PARK, Dong-jin SHIN, Ichiro MORISHITA
  • Publication number: 20120134254
    Abstract: 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.
    Type: Application
    Filed: November 23, 2011
    Publication date: May 31, 2012
    Applicant: SANYO ELECTRIC CO., LTD
    Inventor: Minoru SATO
  • Publication number: 20120099413
    Abstract: 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.
    Type: Application
    Filed: December 26, 2011
    Publication date: April 26, 2012
    Applicant: REALD INC.
    Inventor: Gary D. Sharp
  • Patent number: 8165004
    Abstract: An optical pickup device capable of eliminating interlayer crosstalk which is responsible for fluctuation in control signals and error rate in data signals, thereby ensuring stable action for a multilayered recording disc with a narrow interlayer spacing. The reflected beam coming from the multilayered disc is divided along the central line into two parallel portions by the dividing optical system and then condensed. The reflected beam coming from the active layer, which has been condensed, is reflected by the reflecting plane whose reflecting region is limited and the thus reflected beam is detected by the optical detector. The reflected beam coming from other layers is not reflected by the reflecting plane, so that interlayer crosstalk is reduced.
    Type: Grant
    Filed: October 6, 2010
    Date of Patent: April 24, 2012
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventor: Shigeharu Kimura
  • Patent number: 8165003
    Abstract: A first laser source is arranged on a transmitting side of a polarizing beam splitter, while a second laser source is arranged on a reflecting side of the polarizing beam splitter. The splitting surface of the polarizing beam splitter has a film characteristic of substantially transmitting s-polarization component of the laser light having the first wavelength emitted by the first laser source and substantially reflecting s-polarization component of the laser light having the second wavelength emitted by the second laser source. A plate-like beam splitter serves to introduce laser light reflected off of a signal recording medium into an optical detector by directing the laser light away from the optical path in which the laser sources are located. The plate-like beam splitter includes a splitting surface which has a reflectance that is higher than its transmittance.
    Type: Grant
    Filed: May 25, 2006
    Date of Patent: April 24, 2012
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Tohru Hotta, Ryouichi Kawasaki, Shigeru Nakamura
  • Patent number: 8154976
    Abstract: Disclosed is a reflecting wavelength plate that deflects and reflects a light path and adds a phase difference with respect to plural incident light having different wavelengths. The reflecting wavelength plate includes a substrate; a reflecting film laminated on the substrate; and a sub-wavelength concavo-convex structure that is laminated on the reflecting film and has a pitch less than or equal to the shortest wavelength of the plural incident light. The filling factor and the groove depth of the sub-wavelength concavo-convex structure are determined so as to add the phase difference obtained by (k?)/8, where k is an integer, to the plural incident light having the different wavelengths.
    Type: Grant
    Filed: August 31, 2009
    Date of Patent: April 10, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideaki Hirai, Kazuhiro Umeki, Toshimichi Nasukawa
  • Patent number: 8154977
    Abstract: Disclosed is a reflecting wavelength plate that deflects and reflects a light path and adds a phase difference with respect to plural incident light having different wavelengths. The reflecting wavelength plate includes a substrate; a reflecting film laminated on the substrate; and a sub-wavelength concavo-convex structure that is laminated on the reflecting film and has a pitch less than or equal to the shortest wavelength of the plural incident light. The filling factor and the groove depth of the sub-wavelength concavo-convex structure are determined so as to add the phase difference obtained by (k?)/8, where k is an integer, to the plural incident light having the different wavelengths.
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: April 10, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideaki Hirai, Kazuhiro Umeki, Toshimichi Nasukawa
  • Patent number: 8147069
    Abstract: A lighting device, including a first light source emitting light of a first wavelength; a second light source close to the first source, emitting light of a second wavelength in almost a same direction as that of the first source; a third light source located emitting light of a third wavelength in a direction different from that of the first and second sources; a coupling optical system coupling light from the first and second sources; another coupling optical system coupling light from the third source; and a light path synthesizer synthesizing a light path of light from the first, second and third sources, wherein the light path synthesizer includes a first surface reflecting light from the first source and transmitting light from the second and third sources and a second surface unparallel with the first surface, reflecting light from the second source and transmitting light from the third source.
    Type: Grant
    Filed: July 27, 2009
    Date of Patent: April 3, 2012
    Assignee: Ricoh Company, Limited
    Inventors: Manabu Seo, Hiroshi Akiyama, Shigeru Oouchida, Yukiko Hamano, Goichi Akanuma
  • Publication number: 20120075980
    Abstract: 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.
    Type: Application
    Filed: March 16, 2010
    Publication date: March 29, 2012
    Applicant: Commissariat A L'Energie Atomique et Aux Energies Alternatives
    Inventors: Marieke Laporte-Richard, Mickael Brun
  • Patent number: 8144565
    Abstract: 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.
    Type: Grant
    Filed: January 26, 2009
    Date of Patent: March 27, 2012
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Tomoto Kawamura, Hiroshi Ogasawara
  • Patent number: 8130622
    Abstract: An optical pickup apparatus includes a light generating unit to generate a light to record or reproduce information, an objective lens to focus the light generated from the light generating unit onto a disk, and a multi-sectional polarizer disposed on a light path between the light generating unit and the objective lens and divided into a plurality of sectors having their individual optical axes.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: March 6, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seong-su Park, Soo-han Park, Bong-gi Kim, Ichiro Morishita, Myoung-seok Kim, Jung-woo Hong
  • Patent number: 8130621
    Abstract: A recording and reproducing device that is capable of improving its reproduction quality by efficiently detecting a reproduction signal having small low frequency noises even when reproducing data on a super-resolution optical disk including recording marks smaller than a diffraction limit.
    Type: Grant
    Filed: August 21, 2008
    Date of Patent: March 6, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kenya Nakai
  • Patent number: 8102749
    Abstract: An optical pickup includes: a first emitting unit to emit an optical beam of a first wavelength; a second emitting unit to emit an optical beam of a second wavelength; a third emitting unit to emit an optical beam of a third wavelength; an object lens to condense optical beams emitted from the first through third emitting units onto a signal recording face of an optical disc; and a diffraction unit provided on one face of an optical element or the object lens positioned on the optical path of the optical beams of the first through third wavelengths; wherein the diffraction unit includes a generally circular first diffraction region provided on the innermost perimeter, a ring zone shaped second diffraction region provided on the outer side of the first diffraction region, and a ring zone shaped third diffraction region provided on the outer side of the second diffraction region.
    Type: Grant
    Filed: December 7, 2010
    Date of Patent: January 24, 2012
    Assignee: Sony Corporation
    Inventors: Kazumasa Kaneda, Yoshito Asoma, Toshifumi Yasui, Kazuyuki Takahashi
  • Publication number: 20120008483
    Abstract: 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.
    Type: Application
    Filed: March 4, 2011
    Publication date: January 12, 2012
    Inventor: Hideharu MIKAMI
  • Publication number: 20120008475
    Abstract: An optical pickup device, an optical disk drive and method of controlling light performed by the optical pickup device are provided. The optical pickup device includes: a light transmitting system including an object lens for facing a medium having a multi recording layer for storing information, a light source system for providing a plurality of beams used to record information on or reproduce information from the multi recording layer via the light transmitting system, a light-receiving system disposed on a path of a beam reflected from the medium, and a light controller including a light control device for controlling stray light generated in the medium such that the stray light does not reach the light-receiving device.
    Type: Application
    Filed: July 7, 2011
    Publication date: January 12, 2012
    Inventors: Ui-yol KIM, Yong-jae Lee
  • Patent number: 8094539
    Abstract: An interference-type optical pickup, an optical information detection method, and an optical information recording and reproducing apparatus, which allow easy adjustment of a path difference between two lights, have a high signal amplification effect and are suitable for size reduction of an optical system, are provided. A signal light reflected from an optical disk and a reference light branched from the same light source and guided into detectors without being projected onto the optical disk are caused to interfere with each other on detectors. Detector outputs in four interference states in which phase relationships between the reference light and the signal light are different from each other by degrees are simultaneously obtained and calculated. Accordingly, a readout signal RF that is always stable and amplified with high quality is obtained even when an optical path changes due to disk undulations.
    Type: Grant
    Filed: August 11, 2009
    Date of Patent: January 10, 2012
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventor: Tatsuro Ide
  • Patent number: 8081557
    Abstract: An optical pickup apparatus comprising: a laser light source; an objective lens; a reflection mirror; a photodetector; and a beam splitter, the beam splitter including a first reflective film configured to generate a first phase difference corresponding to a predetermined wavelength with respect to laser light, the reflection mirror including a second reflective film configured to generate a second phase difference corresponding to the predetermined wavelength with respect to the laser light, the first reflective film and the second reflective film being formed so that a combined phase difference of the first phase difference and the second phase difference becomes substantially quarter-wave with respect to the laser light.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: December 20, 2011
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Minoru Sato
  • Publication number: 20110305121
    Abstract: A near-field light generating device (10) which converts incident light into near-field light, includes: a metallic member (11) made of a metallic material; and a dielectric member (12) made of a dielectric material, the metallic member (11) having a first interface (16) and a second interface (18) that sandwich the dielectric member (12), the first interface (16) and the second interface (18) having flections (P16 and P18), respectively, an inner-interface distance, which is a distance between the first interface (16) and the second interface (18), being minimum at location of the flections (P16 and P18), and a rate of change of the inner-interface distance between the first interface (16) and the second interface (18) being asymmetrical with respect to the flections (P16 and P18). With the arrangement, it is possible to provide a minute near-field light generating device which can be easily fabricated and which can obtain high-intensity near-field light whose temporal change in intensity is small.
    Type: Application
    Filed: June 13, 2011
    Publication date: December 15, 2011
    Applicant: Sharp Kabushiki Kaisha
    Inventor: Tazuko Kitazawa
  • Patent number: RE44333
    Abstract: The present invention relates to an optical device which includes a first laser diode, a beam splitter, a first objective lens, a photo-detector, a second laser diode, a wedged plate beam splitter, a second objective lens and a collimator. The present invention deploys two independent transmitting paths. The retrieving paths share the beam splitter and the photo-detector commonly at the returning route.
    Type: Grant
    Filed: December 31, 2008
    Date of Patent: July 2, 2013
    Inventor: Gin-Kon Wang