Diffractive Storage Medium Information Element Patents (Class 369/109.01)
  • Patent number: 11117414
    Abstract: A security element and a value document having such a security element in the form of a strip having a first and second polymer layer are shown, having a visually recognizable halftone printed image, which is luminescent under UV radiation, between the first and second layer, wherein the halftone printed image has an opacity and forms at least one imprint area having a boundary contour within the security element. To increase the forgery protection, it is proposed that at least one of the two polymer layers have an opacity at least in the region of the boundary contour of the imprint area and be adapted in its opacity to the opacity of the imprint area, in order to diminish the visual recognizability of the boundary contour of the imprint area of the luminescent halftone printed image on the security element.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: September 14, 2021
    Assignees: Hueck Folien Gesellschaft M.B.H., Banque de France
    Inventors: Klaus Schmidegg, Sonja Landertshamer, Fabrice Capiez, Olivier Martin, Roger Vilcot, Michel Blanc
  • Patent number: 11009704
    Abstract: A device including a waveguide having a first waveguide surface and a second waveguide surface parallel to the first waveguide surface is disclosed. The device may include a first volume holographic light coupling element disposed between the first waveguide surface and the second waveguide surface. The first volume holographic light coupling element may be structured to reflect at least a portion of incident light as reflected light. Incident light for which the first volume holographic light coupling element is structured to reflect may have a first angle of incidence within a total internal reflection (TIR) range with respect a first axis corresponding to a surface normal of the waveguide. Incident light for which the first volume holographic light coupling element is structured to reflect may have a second angle of incidence with respect to a second axis different from the first axis.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: May 18, 2021
    Assignee: Akonia Holographies LLC
    Inventors: Mark Ayres, Kenneth Anderson, Adam Urness, Friso Schlottau
  • Patent number: 10176838
    Abstract: A cross section of a luminous flux of returning light from a disc is split into a plurality of regions, and an operation is performed so that a weighting of a light amount of a region which has favorable symmetry in a radial direction and is formed on a circumference of an ellipse among the split regions is increased. Further, a lens shift detection signal is formed, and a lens shift detection signal is canceled from a push-pull signal.
    Type: Grant
    Filed: April 20, 2016
    Date of Patent: January 8, 2019
    Assignee: Sony Corporation
    Inventors: Noriaki Nishi, Kimihiro Saito, Nobuhiko Ando, Fumiaki Nakano, Yuuichi Suzuki, Hiroaki Nakagawa, Tetsuya Inoue, Yutaka Tentaku
  • Patent number: 9970891
    Abstract: A method and system for use in reconstruction and retrieval of phase information associated with a two-dimensional diffractive response are presented. The method comprising: providing (75) input data indicative of one or more diffractive patterns corresponding to diffractive responses from one or more objects (50). Dividing (130) said input data into a plurality of one-dimensional slices and determining (140) one-dimensional phase data for at least some of said one-dimensional slices. Tailoring (150) the reconstructed phase data of said one-dimensional slices to form a two-dimensional phase solution. The two-dimensional phase solution is defined by phase shifts of said reconstructed one-dimensional phase data of said one-dimensional slices. The two-dimensional phase solution thus enables obtaining two-dimensional reconstructed phase data suitable for reconstruction of image data (250).
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: May 15, 2018
    Assignee: YEDA RESEARCH AND DEVELOPMENT CO. LTD.
    Inventors: Nirit Dudovich, Oren Raz, Boaz Nadler, Dan Oron
  • Patent number: 9769372
    Abstract: The image estimating method is configured to estimate, using image data generated by capturing an object via an image-pickup optical system at a plurality of positions that are spaced at first intervals in an optical-axis direction of the image-pickup optical system, image data at a position different from the plurality of positions. The image estimating method includes an image acquiring step of acquiring image data, a frequency analyzing step of calculating a transverse cutoff frequency in a direction perpendicular to the optical-axis direction based on the image data acquired in the image acquiring step, and an interval calculating step of calculating the first interval based on the transverse cutoff frequency calculated by the frequency analyzing step.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: September 19, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Akira Eguchi
  • Patent number: 9116122
    Abstract: An optical biosensor is provided for detecting a bio-molecular sample by Goos-Hänchen (GH) enhancement of Aharonov-Albert-Vaidman (AAV) amplification to a surface plasmon resonance (SPR) detector. The sensor includes pre- and post-selection polarizers respectively upstream and downstream of a right-isosceles prism with a metal film and a liquid medium disposed on a diagonal side of the prism. Laser light passes through the first polarizer, reflects at the film, passes through the second polarizer and is detected with a shift determined by a pointer estimator to indicate the sample.
    Type: Grant
    Filed: February 19, 2014
    Date of Patent: August 25, 2015
    Assignee: The United States of America as Represented by the Secretary of the Navy
    Inventors: Allen D. Parks, Scott E. Spence, Rose M. Hayden
  • Publication number: 20130336100
    Abstract: In an optical disk including at least a rewritable phase change material and comprising a recording layer having a reflectivity of more than 15%, an address output value as an address pit signal component occupying in a reproduced signal in a non recording state is prescribed to be 0.18 though 0.27 or a numerical aperture of an address pit signal occupying in a reproduced signal in a non recording state is prescribed to be more than 0.3.
    Type: Application
    Filed: August 20, 2013
    Publication date: December 19, 2013
    Applicant: JVC Kenwood Corporation
    Inventors: Tetsuya Kondo, Eiji Nakagawa, Hirofumi Nagano
  • Patent number: 8605559
    Abstract: In a small-sized optical pickup device for enabling to obtain a stable servo-signal, as well as, a focus error signal and a tracking error signal, without receiving ill influences of stray lights from other layers, when recording/reproducing a multi-layer optical disc, a reflection light from the multi-layer optical disc is divided into plural numbers of regions by a diffraction grating. And, it is divided into at least four (4) regions, by a division line in the tangential direction of the optical disc and a division line in the radial direction thereof. Light receiving parts, for detecting either one of grating diffraction lights, i.e.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: December 10, 2013
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Kazuyoshi Yamazaki, Daisuke Tomita
  • Patent number: 8576684
    Abstract: An optical pickup and an information storage medium system using the same. The optical pickup includes a light source that emits light having a plurality of different wavelengths. The optical pickup includes a diffraction device having a plurality of diffraction patterns corresponding to the plurality of different wavelengths to divide the light incident from the light source unit into main light and sub light. The optical pickup further includes a photo-detector having a first main light reception unit that receives the main light and a first sub light reception unit that receives the sub light so as to detect an information signal and/or an error signal by receiving reflected light. The first sub light reception unit of the photo-detector is shaped so as to reduce reception of noise sub light due to diffraction based on an undesired diffraction pattern of sub light generated the diffraction device.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: November 5, 2013
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventors: Ui-yol Kim, Yong-jae Lee
  • Patent number: 8531930
    Abstract: For obtaining stable servo-signals without receiving ill influences of stray lights from other layers, on both a focus error signal and a tracking error signal, when recording/reproducing a multi-layer optical disc having small gap between layers thereof, a light beam is divided with using a first and a second diffraction gratings. The first diffraction grating is a polarization diffraction grating, and is mounted on an actuator. The second diffraction grating is disposed on a fixed portion. The first diffraction grating has a first region having a center of a light beam and other(s), and among signal lights reflecting from the disc, the light beam entering into the first region is diffracted, and the light beam entering into the second region transmits therethrough. The second diffraction grating transmits the light beam diffracting on the first region of the polarization diffraction grating therethrough, while diffracting the light beam diffracting on the second region.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: September 10, 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
  • Patent number: 8483033
    Abstract: An objective optical system for an optical information recording/reproducing apparatus, at least one surface of the objective optical system being configured to be a phase shift surface having a phase shift structure, wherein: the phase shift surface has a first area contributing to converging first, second and third light beams onto recording surfaces of first, second and third optical discs, respectively; in the first area, the phase shift surface has at least two types of phase shift structures including a first phase shift structure having first steps and a second phase shift structure having second steps; the phase shift surface has a plurality of combinations of annular zones which satisfy a condition: 0.95<P1/P2<1.05??(1), and the phase shift surface satisfies a following condition: ?3.00<??1/??2<?0.10??(2).
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: July 9, 2013
    Assignee: Hoya Corporation
    Inventors: Naoki Yamagata, Satoshi Inoue, Shuichi Takeuchi
  • Patent number: 8462604
    Abstract: A method and an apparatus for reading data from or writing data to an optical recording medium is described, the data being stored as marks having different lengths. Marks having a length below the limit of diffraction at a first wavelength are read or written with the first wavelength, whereas marks having a length above the limit of diffraction at the first wavelength are read or written with a second wavelength larger than the first wavelength.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: June 11, 2013
    Assignee: Thomson Licensing, LLC
    Inventor: Gael Pilard
  • Publication number: 20130135980
    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: Application
    Filed: November 13, 2012
    Publication date: May 30, 2013
    Inventor: Shangqing Liu
  • Patent number: 8437238
    Abstract: There is provided a diffraction grating including a convex portion and a concave portion which are used for lights having different wavelengths ?1, ?2 and ?3 and are alternately disposed on at least one surface of a substrate with a predetermined pitch. An average refractive index of the convex portion is smaller than an average refractive index of the concave portion. A phase difference in the lights having the wavelength ?1 which transmit the convex portion and the concave portion and a phase difference in the lights having the wavelength ?2 which transmit the convex portion and the concave portion are both substantially the integral multiple of 2?, and a phase difference in the lights having the wavelength ?3 which transmit the convex portion and the concave portion is substantially the non-integral multiple of 2?.
    Type: Grant
    Filed: July 24, 2012
    Date of Patent: May 7, 2013
    Assignee: Asahi Glass Company, Limited
    Inventors: Koji Miyasaka, Hiromasa Sato
  • Patent number: 8427911
    Abstract: An optical pickup includes a light source, an objective lens, a diffraction grating that divides an optical beam reflected from a predetermined information layer, into a plurality of optical beams, and a detector having a plurality of photo-receivers to receive a plurality of optical beams. The diffraction grating has a predetermined region for dividing from a signal light beam a region including a central portion of a spot which the signal light beam will form on the diffraction grating. A distance from a central section of the detector to that of a spot center photo-receiver on the detector, the spot center photo-receiver being provided to receive the optical beams formed by division in a predetermined region of the diffraction grating, is equal to or greater than a spot radius of the unwanted light beams entering the predetermined region of the diffraction grating, on the detector.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: April 23, 2013
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Hiromi Kita, Tomoto Kawamura, Toshiteru Nakamura
  • Patent number: 8406109
    Abstract: An optical pickup apparatus is provided. Segmented regions included in a focus diffraction region includes focus segmented regions corresponding in number with different light emitted by a light source. Different focus segmented regions are arranged adjacent to each other alternately in a direction perpendicular to a parallel dividing line. Segmented regions included in a tracking diffraction region includes tracking segmented regions corresponding in number with different light emitted by the light source. Different tracking segmented regions are arranged adjacent to each other alternately in a direction perpendicular to the parallel dividing line.
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: March 26, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Satoru Fukumoto, Shinzoh Murakami
  • Patent number: 8379501
    Abstract: The present principles provide a way to place a multilevel grayscale image, visible with the bare eye in the data area of an optical disc. This feature can be used to authenticate a legitimate disc, since the image features are lost when copying a disc either with a PC recording drive or by a pirate creating a data set to be used on a laser beam recorder to produce forged ROM discs. The modulation rules are selectively varied during disc writing in a way to change the distribution of pit/land lengths, so that the at least three (3) different diffraction properties are generated, and therefore produce at least three (3) distinct looks to the bare eye.
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: February 19, 2013
    Assignee: Thomson Licensing
    Inventors: Holger Hofmann, Alan Bruce Hamersley, John Matthew Town
  • Publication number: 20130016597
    Abstract: An optical pickup apparatus is provided. Segmented regions included in a focus diffraction region includes focus segmented regions corresponding in number with different light emitted by a light source. Different focus segmented regions are arranged adjacent to each other alternately in a direction perpendicular to a parallel dividing line. Segmented regions included in a tracking diffraction region includes tracking segmented regions corresponding in number with different light emitted by the light source. Different tracking segmented regions are arranged adjacent to each other alternately in a direction perpendicular to the parallel dividing line.
    Type: Application
    Filed: June 19, 2012
    Publication date: January 17, 2013
    Inventors: Satoru Fukumoto, Shinzoh Murakami
  • Publication number: 20120250486
    Abstract: A method and an apparatus for reading data from or writing data to an optical recording medium is described, the data being stored as marks having different lengths. Marks having a length below the limit of diffraction at a first wavelength are read or written with the first wavelength, whereas marks having a length above the limit of diffraction at the first wavelength are read or written with a second wavelength larger than the first wavelength.
    Type: Application
    Filed: November 19, 2010
    Publication date: October 4, 2012
    Inventor: Gael Pilard
  • Patent number: 8279737
    Abstract: There is provided a diffraction grating including a convex portion and a concave portion which are used for lights having different wavelengths ?1, ?2 and ?3 and are alternately disposed on at least one surface of a substrate with a predetermined pitch. An average refractive index of the convex portion is smaller than an average refractive index of the concave portion. A phase difference in the lights having the wavelength ?1 which transmit the convex portion and the concave portion and a phase difference in the lights having the wavelength ?2 which transmit the convex portion and the concave portion are both substantially the integral multiple of 2?, and a phase difference in the lights having the wavelength ?3 which transmit the convex portion and the concave portion is substantially the non-integral multiple of 2?.
    Type: Grant
    Filed: February 7, 2011
    Date of Patent: October 2, 2012
    Assignee: Asahi Glass Company, Limited
    Inventors: Koji Miyasaka, Hiromasa Sato
  • Patent number: 8189448
    Abstract: An objective optical system for an optical information recording/reproducing apparatus for recording/reproducing for first, second and third optical discs by selectively using three types of substantially collimated light beams including first, second and third light beams respectively having first, second and third wavelengths, wherein at least one of optical surfaces of the objective optical system comprises a diffraction surface having a diffraction structure, the diffraction surface includes a first region defined by first and second optical path difference functions, a second region defined by at least one type of optical path difference function, and a third region defined by at least one type of optical path difference function, the first region satisfies a condition: ?0.15<f1/fD11<?0.03??(1), where fD11=?1/(2×P112×m11×?), and the diffraction surface satisfies a condition: ?0.05<(?13(h3)??13(h2))/(m13×f1)<?0.005??(2).
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: May 29, 2012
    Assignee: Hoya Corporation
    Inventors: Daisuke Koreeda, Shuichi Takeuchi
  • Patent number: 8184509
    Abstract: Of the beams reflected by an optical disk, only peripheral beams excluding the push-pull region are used to generate a DPD signal in order to optimize internal wire connections among the light receiving areas of the optical detector and thereby reduce the amplification factor of the lens error signal, required for generating the tracking error signal of the DPP method. A beam reflected from a multilayered optical disk is divided into some beam diffraction areas. The divided beam diffraction areas and the light receiving areas are so arranged that the divided beams focus at different positions on the optical detector and that, when a beam is focused on a target recording layer of the disk, stray light from other than the target recording layer being reproduced does not enter into the servo signal light receiving area of the optical detector.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: May 22, 2012
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Toshiteru Nakamura, Nobuo Nakai, Shigeharu Kimura
  • Patent number: 8174939
    Abstract: An optical head includes a diffraction element capable of improving the quality of a TE signal by a DPP method even if light amounts of two sub-spots are unbalanced for optical discs having different groove pitches. In a three-beam optical head, a diffraction element is divided in a radial direction of an optical disc into a first area, a second area and a third area, wherein the second area is further divided into a fourth area and a fifth area. The periodic structure of the first area is displaced from that of the fourth area by a ¼ period, the periodic structure of the third area is displaced from that of the first area by a ½ period, and the periodic structure of the fifth area is displaced from that of the third area by a ¼ period and from that of the fourth area by a ½ period.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: May 8, 2012
    Assignee: Panasonic Corporation
    Inventors: Akihiro Arai, Yoshiaki Komma
  • Publication number: 20120106310
    Abstract: An optical head device mounted in an optical disc device. The optical head device is provided with a diffractive optical element and a photodetector. The diffractive optical element has: a primary diffraction region at a location on which the positive and negative first-order components and some of the zero-order component of a reflectively diffracted light beam are incident; and secondary diffraction regions at locations on which the rest of the zero-order component but none of the positive or negative first-order components of the reflectively diffracted light beam are incident. A main light-receiving section of the photodetector receives the zero-order component of a transmissively diffracted light beam that has passed through the primary diffraction region and the secondary diffraction regions.
    Type: Application
    Filed: January 17, 2011
    Publication date: May 3, 2012
    Inventors: Masahisa Shinoda, Hironori Nakahara, Masayuki Omaki, Kenya Nakai, Nobuo Takeshita
  • Patent number: 8134908
    Abstract: An optical pickup with a simplified structure in which, according to the type of optical disc, diffracted light from three types of laser light can be directed efficiently onto a photodetector and appropriate focus control can be performed based on the signals detected by the photodetector, and a diffractive optical element that can be used in the optical pickup, which has a semiconductor laser 10 that can emit three types of laser light, a diffractive optical element 42 that diffracts the laser light reflected from the optical disc 31, and a single photodetector 43 that detects the diffracted light exiting the diffractive optical element 42.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: March 13, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masahisa Shinoda, Daisuke Matsubara, Kenya Nakai, Hironori Nakahara
  • Patent number: 8111606
    Abstract: The optical storage medium comprises a substrate layer, a data layer, and a nonlinear layer with a super-resolution structure disposed on the data layer, wherein pits and lands having a size above a diffraction limit of a pickup for reading of the data establish a first and a second level of the data layer, and pits and lands having a size below the diffraction limit of the pickup are arranged on a further level of the data layer. In a preferred embodiment, pits having a size below the diffraction limit are arranged on a third level and lands having a size below the diffraction limit are arranged on a fourth level of the data layer. The optical storage medium is in particular a read-only optical disc comprising a phase-change material, for example AgInSbTe, for providing the super-resolution effect.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: February 7, 2012
    Assignee: Thomson Licensing
    Inventors: Christophe Fery, Larisa von Riewel, Gael Pilard
  • Publication number: 20110261671
    Abstract: In case of reproducing a hologram recorded on an optical information recording medium, adjusting beam with the amplitude distribution and phase distribution at least partially the same as those of a signal beam upon recording is radiated to the optical information recording medium which records information. The diffracting beam diffracted by the hologram is detected by a photodetector. Based on the detected information, an incident angle of the reference beam to the optical information recording medium is appropriately controlled.
    Type: Application
    Filed: April 14, 2011
    Publication date: October 27, 2011
    Inventors: Toshiki ISHII, Kenichi Shimada, Yusuke Nakamura
  • Patent number: 8036072
    Abstract: A holographic recording and reproduction system includes a servo optical path, which is used to provide a servo mechanism, so that holographic interference fringes can be stored continuously into a holographic recording medium, and when the reproduction signals are desired, they can be fetched and obtained swiftly and accurately by making use of the servo mechanism. In addition, the servo light spot of the servo optical path is located on the optical axis of an object lens, thus reducing the image aberrations produced and raising the quality of the signals read for the servo track searching. Moreover, the light intensity distribution of the reference beams reflected by the holographic recording medium is monitored and controlled, as such realizing the analysis and adjustment of the relative distance and inclination angle between the holographic recording and reproduction system and the holographic recording medium.
    Type: Grant
    Filed: June 7, 2007
    Date of Patent: October 11, 2011
    Assignee: Industrial Technology Research Institute
    Inventors: Chih-Ming Lin, Yung-Sung Lan, Tzuan-Ren Jeng
  • Patent number: 8018799
    Abstract: An optical pickup device is provided. The optical pickup device includes a first, second, and third light emitting portions emitting light beams having first, second, and third wavelengths, respectively; an adjusting element for optical axes enabled to control the optical axis of the return light beam reflected by the optical recording media after output from the light emitting portion, and a single photo detector receiving the return light beams passing through the adjusting element for optical axes. The first light emitting portion and the second light emitting portion are arranged in such a way that the optical axis of the first light beam and the optical axis of the third light beam approximately coincide with each other. The adjusting element for optical axes controls the axis of the return light beam of said second light beam and the single photo detector receives the return light beams of the first light beam, the second light beam and the third light beam.
    Type: Grant
    Filed: September 19, 2006
    Date of Patent: September 13, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Daisuke Matsubara, Masahisa Shinoda
  • Publication number: 20110164487
    Abstract: A writing condition adjusting apparatus according to the present invention adjusts a writing condition using first and second recording patterns. The first recording pattern is used to adjust a writing condition for recording marks and spaces, of which the lengths are equal to or longer than a predetermined recording length, while the second recording pattern is used to adjust a writing condition for recording marks and spaces, of which the lengths are shorter than the predetermined recording length by one recording unit length. If it has been decided that the writing condition that has once been determined by making the write adjustment on such marks that are shorter by one recording unit length needs to be adjusted again, a signal index value that has been defined based on the first recording pattern is set to be a target value.
    Type: Application
    Filed: February 12, 2010
    Publication date: July 7, 2011
    Inventors: Isao Kobayashi, Kohei Nakata
  • Patent number: 7952978
    Abstract: An optical controller includes a light source for emitting light, an object lens for condensing light emitted from the light source, a light detection unit for receiving light reflected on an optical information recording medium and outputting a signal corresponding to the amount of the light, and a laser control unit for controlling the amount of the light emitted from the light source to the information recording surface on which information is to be recorded or reproduced, based on the recording state of an information recording surface disposed closer to the object lens than an information recording surface on which the information is to be recorded or reproduced.
    Type: Grant
    Filed: October 19, 2006
    Date of Patent: May 31, 2011
    Assignee: Panasonic Corporation
    Inventors: Joji Anzai, Hideki Aikoh, Eishin Mori, Takayuki Nagata
  • Patent number: 7929398
    Abstract: An optical pickup including a light source, two light focus devices, a light reception device, a polarization selective light path splitting device, a polarization switching device, a first diffraction element including a periodic structure including two kinds of sub-wavelength convexo-concave structures while the two kinds of sub-wavelength convexo-concave structures alternately arranged at right angles to each other, and the filling factors of the two kinds of sub-wavelength convexo-concave structures are determined to substantially equalize effective refractive indices of the two kinds of sub-wavelength convexo-concave structures with regard to the polarization direction of the outgoing light beam, and the second diffraction element having a structure similar to that of the first diffraction element except that the filling factors are determined to substantially equalize effective refractive indices of the two kinds of sub-wavelength convexo-concave structures with regard to a polarization direction perpen
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: April 19, 2011
    Assignee: Ricoh Company, Ltd.
    Inventor: Hideaki Hirai
  • Publication number: 20110051574
    Abstract: Of the beams reflected by an optical disk, only peripheral beams excluding the push-pull region are used to generate a DPD signal in order to optimize internal wire connections among the light receiving areas of the optical detector and thereby reduce the amplification factor of the lens error signal, required for generating the tracking error signal of the DPP method. A beam reflected from a multilayered optical disk is divided into some beam diffraction areas. The divided beam diffraction areas and the light receiving areas are so arranged that the divided beams focus at different positions on the optical detector and that, when a beam is focused on a target recording layer of the disk, stray light from other than the target recording layer being reproduced does not enter into the servo signal light receiving area of the optical detector.
    Type: Application
    Filed: April 15, 2010
    Publication date: March 3, 2011
    Inventors: TOSHITERU NAKAMURA, NOBUO NAKAI, SHIGEHARU KIMURA
  • Patent number: 7792003
    Abstract: Methods for recording volume Bragg grating structures having a target wavelength are disclosed. Such a method may include providing a photosensitive recording medium, bringing a first face of the recording medium into contact with a face of a prism, the prism being made of a material that is transparent at a recording wavelength, and recording a Bragg grating onto the recording medium by exposing the prism to an incident light wave at the recording wavelength.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: September 7, 2010
    Assignee: PD-LD, Inc.
    Inventors: Boris Leonidovich Volodin, Sergei Dolgy, Vladimir S. Ban
  • Publication number: 20100165816
    Abstract: A system and method for controlling tracking in a holographic data storage system, including: impinging a beam on a holographic data disc, wherein the beam is reflected from a micro-hologram disposed within the holographic data disc; detecting the reflected beam from the holographic data disc by a multi-element detector; and analyzing a pattern detected by multi-element detector to generate a tracking error signal.
    Type: Application
    Filed: December 30, 2008
    Publication date: July 1, 2010
    Applicant: General Electric Company
    Inventors: Victor Petrovich Ostroverkhov, Brian Lee Lawrence, Xiaolei Shi, Zhiyuan Ren, Zexin Pan
  • Publication number: 20100149936
    Abstract: In an optical head apparatus and an optical disc apparatus which can reduce influence of interlayer stray light on a differential push-pull signal without making the configuration complicated, Uy=Ty×N1 is satisfied, where Ty denotes a length in the y-direction of one period of an interference fringe which is formed on the photodetector 9 by reflected light of the zero-order diffracted light by an information recording surface other than the access-target information recording surface, reflected light of the positive-first-order diffracted light by the information recording surface other than the access-target information recording surface, and reflected light of the negative-first-order diffracted light by the information recording surface other than the access-target information recording surface, N1 denotes a positive integer, and Uy denotes each length in the y-direction of the divisional light-receiving elements 9e, 9f, 9g, and 9h.
    Type: Application
    Filed: March 5, 2008
    Publication date: June 17, 2010
    Inventor: Hironori Nakahara
  • Publication number: 20100135143
    Abstract: An optical system for efficiently extracting plural signal beams from a bundle of rays reflected from a multilayer optical disc.
    Type: Application
    Filed: August 13, 2007
    Publication date: June 3, 2010
    Inventor: Tetsuya Ogata
  • Publication number: 20100118683
    Abstract: An embodiment generally relates to an optical device suitable for use with an optical medium for the storage and retrieval of data. The optical device includes an illumination means for providing a beam of optical radiation of wavelength ? and an optical path that the beam of optical radiation follows. The optical device also includes a diffractive optical element defined by a plurality of annular sections. The plurality of annular sections having a first material alternately disposed with a plurality of annular sections comprising a second material. The diffractive optical element generates a plurality of focal points and densely accumulated ray points with phase contrast phenomena and the optical medium is positioned at a selected focal point or ray point of the diffractive optical element.
    Type: Application
    Filed: June 24, 2009
    Publication date: May 13, 2010
    Inventors: Sang H. Choi, Yeonjoon Park, Glen C. King, James R. Elliott
  • Publication number: 20100097917
    Abstract: An optical pickup with a simplified structure in which, according to the type of optical disc, diffracted light from three types of laser light can be directed efficiently onto a photodetector and appropriate focus control can be performed based on the signals detected by the photodetector, and a diffractive optical element that can be used in the optical pickup, which has a semiconductor laser 10 that can emit three types of laser light, a diffractive optical element 42 that diffracts the laser light reflected from the optical disc 31, and a single photodetector 43 that detects the diffracted light exiting the diffractive optical element 42.
    Type: Application
    Filed: February 19, 2008
    Publication date: April 22, 2010
    Inventors: Masahisa Shinoda, Daisuke Matsubara, Kenya Nakai, Hironori Nakahara
  • Patent number: 7697391
    Abstract: An information storage apparatus uses an optical data element (nano-grating) with features that are smaller than the wavelength of light. The optical data element alters one or more properties of the light such as reflected amplitude, polarization, phase, wavelength, and spatial orientation to encode data in a massively multi-level format.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: April 13, 2010
    Assignee: EMC Corporation
    Inventor: Fred C Thomas, III
  • Patent number: 7668065
    Abstract: An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a first light source for emitting first light flux having a first wavelength; a second light source for emitting second light flux having a second wavelength, the first wavelength being different from the second wavelength; a converging optical system having an optical axis and a diffractive portion, and a photo detector; wherein in case that the first light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the first light flux is greater than that of any other ordered diffracted ray of the first light flux, and in case that the second light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the second light flux is greater than that of any other ordered diffracted
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: February 23, 2010
    Assignee: Konica Corporation
    Inventors: Norikazu Arai, Toshiyuki Kojima, Toshihiko Kiriki, Kohei Ota, Shinichiro Saito
  • Patent number: 7668064
    Abstract: According to one embodiment, an optical pickup unit which can record, reproduction and erase information in/from an information recording medium has tracks with different pitches, the dividing means has at least a part of a dividing boundary line placing between an end of a 1st order diffraction light with the largest diffraction angle and an end of a 1st order diffraction light with the smallest diffraction angle of the reflected laser beam.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: February 23, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Nobuaki Kaji, Sumitaka Maruyama, Akihito Ogawa, Kazuo Watabe
  • Publication number: 20100027384
    Abstract: A diffractive optical element generates main and two sub beams from an output light of a light source. An objective lens focuses the main and two sub beams on an optical recording medium. An optical detector receives the main and two sub beams reflected by the optical recording medium. The diffractive optical element is divided into six regions having different optical characteristics by a tangential direction division line corresponding to the tangential direction of the optical recording medium, first and second radial direction division lines corresponding to the radial direction thereof. A light in the first sub beam passing an intersection of the first radial and tangential direction division lines passes a region near the center of the objective lens. A light in the second sub beam passing an intersection of the second radial and the tangential direction division lines passes a region near the center of the objective lens.
    Type: Application
    Filed: September 3, 2007
    Publication date: February 4, 2010
    Inventor: Ryuichi Katayama
  • Publication number: 20100027402
    Abstract: An optical head device includes: a diffraction unit including a plurality of diffraction portions each diffracting a incident light in a given direction, the light beam being reflected by an optical disc; and a photodetection unit including a plurality of photodetectors each outputting a signal corresponding to an intensity of an irradiated light, wherein the photodetectors include at least two first photodetectors for generating a compensation value to compensate a tracking error signal, and wherein the diffraction portions include at least two first portions for focusing the incident light into the first photodetectors.
    Type: Application
    Filed: June 19, 2009
    Publication date: February 4, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Katsuo IWATA, Kazuhiro NAGATA
  • Publication number: 20100020670
    Abstract: An optical pickup device and an optical recording/reproduction device are provided that can suppress a tracking error signal offset generated in the boundary between an unrecorded area and a recorded area. A three-beam diffraction grating is divided into two areas. A division line that divides the diffraction grating into two areas has a step in the direction almost vertical to a groove period structure, and the part of the division line in the step has a staircase shape. The phase difference in the groove period structures between one area and the other area, separated by the division line, is about 180 degrees.
    Type: Application
    Filed: April 2, 2009
    Publication date: January 28, 2010
    Inventor: Kazuyoshi YAMAZAKI
  • Patent number: 7648074
    Abstract: A value or security document (2) contains a security feature (4) in the form of a film laser with an emitter layer (12) and preferably a protective layer (14). A spatial, periodic modulation (8), preferably of the surface of a substrate, permits fine adjustment of a laser wavelength within a range of possible wavelengths. This permits a coding of the security feature by different portions of different wavelengths.
    Type: Grant
    Filed: November 19, 2002
    Date of Patent: January 19, 2010
    Assignee: Giesecke & Devrient GmbH
    Inventors: Thomas Attenberger, Wolfgang Deckenbach, Rainer Hoppe
  • Publication number: 20100008207
    Abstract: A method and apparatus involve: supporting an optical part for movement in relation to a first path of travel of radiation; moving the part successively to first and second positions in which radiation arriving along the first path of travel passes respectively through first and second sections of the part that provide respective different levels of refraction, the first and second sections causing radiation to thereafter travel along respective second and third paths of travel; and receiving at an output first and second portions of radiation respectively propagating along the second and third paths of travel, the first and second portions containing different amounts of optical energy.
    Type: Application
    Filed: July 8, 2008
    Publication date: January 14, 2010
    Applicant: RAYTHEON COMPANY
    Inventors: Donald J. Denis, William Conrad Stenton
  • Patent number: 7643400
    Abstract: An optical data storage medium comprises an optical medium with multiple data marks. Each data mark is arranged for modifying a portion of an optical reading beam incident thereon. At least one of the data marks is a delocalized data mark comprising a set of multiple diffractive elements collectively arranged for modifying a portion of the optical reading beam incident thereon. A method for recording data on an optical data storage medium comprises forming on or in the optical medium multiple data marks encoding the recorded data, including the at least one delocalized data mark. A method for reading an optical data storage medium comprises: successively illuminating with the optical reading beam the multiple data marks; sensing variations among the respective portions of the optical reading beam modified by the multiple data marks; and decoding from the sensed variations data encoded by the multiple data marks.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: January 5, 2010
    Assignee: LightSmyth Technologies Inc
    Inventors: Dmitri Iazikov, Christoph M. Greiner, Thomas W. Mossberg
  • Publication number: 20090290473
    Abstract: [Problems] An optical head device and an optical information recording or reproducing apparatus are provided to detect an excellent track error signal for two-layer optical recording medium. [Means for Solving Problems] Reflecting light of a main beam and sub-beams reflected from a disc is diffracted by a diffractive optical element (9a) and then received by a photodetector. The diffractive optical element (9a) is divided into regions (13a) to (13d) by two lines in parallel with radial and tangential directions passing through an optical axis of incident light. Diffracting gratings pitches at the regions (13a) to (13d) become wider in order.
    Type: Application
    Filed: November 17, 2006
    Publication date: November 26, 2009
    Applicant: NEC CORPORATION
    Inventor: Ryuichi Katayama