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| Number | Title | Issue Date |
| 8154977 | Reflecting wavelength plate and optical pickup using reflecting wavelength plate 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 th... | 04/10/2012 |
| 8154976 | Reflecting wavelength plate and optical pickup using reflecting wavelength plate 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 th... | 04/10/2012 |
| 8144565 | 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 seco... | 03/27/2012 |
| 8130622 | Optical pickup apparatus having multi-sectional polarizer 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 b... | 03/06/2012 |
| 8023390 | 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 regenera... | 09/20/2011 |
| 7986606 | Optical head device An optical head device having a broadband phase plate of transforming at least three linearly polarized light beams having different wavelengths into circularly polarized light beams, is obtained. A broadband phase plate comprising two phase plates 9A ... | 07/26/2011 |
| 7986607 | Wave plate, optical pickup and optical disc apparatus An optical pickup includes a wave plate on an optical path to be followed by every light beam emitted from three light sources (with wavelengths λ1, λ2 and λ3, respectively) both on their way toward an optical disc and back from t... | 07/26/2011 |
| 7969851 | Laser converging apparatus, optical pickup device, and optical disc recording/reproducing apparatus A laser converging apparatus comprising: a nonpolarizing hologram element having a first area defined by a numerical aperture corresponding to a thickness of a first protective layer of a first disk medium and a second area inside the first area, the second area def... | 06/28/2011 |
| 7889619 | Hologram recording/reproducing apparatus and light source apparatus A hologram recording/reproducing apparatus records data as a hologram by applying signal and reference light beams to a hologram-recording medium, obtains a diffracted light beam by applying a reproduction light beam to the hologram, and reproduces the data using th... | 02/15/2011 |
| 7876660 | Optical pickup apparatus An optical pickup apparatus includes: a first light source for emitting a first light flux; a light-converging optical system including an objective lens and a diffractive structure. When the first light flux from an optical information recording medium enters into ... | 01/25/2011 |
| 7864651 | 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 sou... | 01/04/2011 |
| 7848210 | Optical head and optical disk apparatus An optical head includes: a first optical element having an optical characteristic of reflecting a light of a first wavelength and transmitting lights of second and third wavelengths, on the first optical element the light of the first wavelength from a first light ... | 12/07/2010 |
| 7848209 | Optical pickup and optical information processing apparatus with light sources of three different wavelengths An optical pickup apparatus for performing recording, reproduction and deletion of information onto each of three types of optical recording mediums including light sources of a blue wavelength zone, light sources of a red wavelength zone and light sources of an inf... | 12/07/2010 |
| 7821903 | Optical pickup device and optical recording medium driving device An optical pickup device has a first light source and a second light source each adapted for outputting a laser beam of a predetermined wavelength, a photodetector for detecting an intensity of the laser beam outputted from the first light source or the second light... | 10/26/2010 |
| 7778141 | Optical pickup, optical disc device, polarization adjustment plate, and optical device The present invention can simplify the configuration of a polarization adjustment plate. According to the present invention, the crystal axis of the polarization adjustment wavelength plate 32 is so arranged as to be turned up from the X-Y plane being an orth... | 08/17/2010 |
| 7760612 | Optical element and optical head device using it, and optical information device using this optical head device, and computer, optical disk player, car navigation system, optical disk recorder and optical disk server using this optical information device Providing an objective lens with a large numerical aperture (NA), the present invention records or plays conventional optical disks such as CDs and DVDs using an optical head capable of recording or reproducing high-density optical disks. An optical element (8 | 07/20/2010 |
| 7742382 | Laser converging apparatus, optical pickup device and optical disc recording/reproduction apparatus A laser converging apparatus is disclosed that comprises a polarizing hologram element having a first area defined by a numerical aperture corresponding to a thickness of a first protective layer of a first disk medium and a second area inside the first area, the se... | 06/22/2010 |
| 7738346 | Polarizing diffraction element and optical head device A polarizing diffraction element having a wavelength selectivity which functions as a polarizing diffraction element at a wavelength λ1, and which does not function as a diffraction grating not depending on incident polarization state and shows high tran... | 06/15/2010 |
| 7715301 | Wave plate An optical element having an optical multi-layer coating which can function as a phase plate without using quartz crystal or an optical film. The optical multi-layer coating is deposited on a plane which is set up on the optical element by way of a perpendicularly i... | 05/11/2010 |
| 7710849 | Optical head device and optical information recording or reproducing device Provided is an optical head device and an optical information recording or reproducing device for performing recording or reproduction to/from a plurality of types of optical recording medium, which can obtain a stable track error signal by a small size and exhibits... | 05/04/2010 |
| 7697397 | Laser converging apparatus, optical pickup device and optical disc recording/reproduction apparatus A laser converging apparatus is disclosed that comprises a polarizing hologram element having a first area defined by a numerical aperture corresponding to a thickness of a first protective layer of a first disk medium and a second area inside the first area, the se... | 04/13/2010 |
| 7656771 | Optical pickup and optical disc drive An optical pickup for writing information to and/or for reading information from an optical disc having at least two recording layers (dual layer) provided with first and second recording layers can prevent layer crosstalk resulting from disturbing a signal reproduc... | 02/02/2010 |
| 7586827 | Optical pickup apparatus An optical pickup apparatus has a semiconductor laser source which emits a laser beam in a wavelength band of 405 nm having an elliptic light intensity distribution; a beam shaping element which shapes the light intensity distribution of the laser beam; a polarizing... | 09/08/2009 |
| 7435934 | Optical pickup apparatus which is compatible with multiple types of media An optical pickup apparatus includes a first objective lens having a low numerical aperture (NA) suitable for a low density recording medium, a second objective lens having a high NA suitable for a high density recording medium, a first light source that emits short... | 10/14/2008 |
| 7417936 | Optical pickup reducing noise and polarization changer An optical pickup includes a laser light source, an objective lens which focuses light emitted from the laser light source on an optical information storing medium, an optical path changer which changes a proceeding path of the light emitted from the laser light sou... | 08/26/2008 |
| 7385905 | Apparatus for reading from and/or writing to optical recording media When an optical recording medium having a plurality of data layers is being read from and/or written to, the input beam experiences an aberration, inter alia in the top layers of the data layers. In order, nevertheless, to achieve a high data density, a device for c... | 06/10/2008 |
| 7369479 | Optical miniaturized module, optical pickup device, and optical disk device provided with light source and photodetector The optical miniaturized module includes a semiconductor laser for irradiating an optical disk with laser light, a diffraction grating for forming a main beam and two sub beams from the laser light, a polarization hologram for dividing reflected light from the optic... | 05/06/2008 |
| 7359308 | Fixing structure for optical element and optical head device A fixing structure for an optical element includes a first element face of the optical element, a second element face of the optical element which is orthogonal to the first element face, a first positioning plane of a fixed member which abuts with the first element... | 04/15/2008 |
| 7352678 | Laminated wave plate and optical pickup using the same A conventional broadband quarter-wave plate has not completely solved the wavelength dependence and has different efficiencies of shifting the phase by 90° depending on the wavelengths, and therefore has a problem that it cannot fulfill the strict specificat... | 04/01/2008 |
| 7336586 | Optical pickup device compatible with two types of optical recording media An optical pickup device compatible with two types of optical recording media in accordance with the present invention includes: a first light source emitting a first laser beam with a first wavelength; a second light source emitting a second laser beam with a secon... | 02/26/2008 |
| 7313061 | Optical pickup having a plurality of photodetectors divided into four regions used to obtain both focus and tracking error signals An optical pickup comprises: first and second semiconductor lasers (11, 14); a hologram element (17) for diffracting light reflected by an optical information recording medium (9 or 12); and a plurality of photodetectors (18-23 | 12/25/2007 |
| 7313073 | Optical pickup and optical disk system An optical pickup for reading information written on an optical disk is equipped with a laser diode having a front facet which emits light, a parallel light ray portion which collimates the emitted light from the laser diode, means for focusing collimated output lig... | 12/25/2007 |
| 7298686 | Optical pickup and optical disk reproducing device An optical pickup in an optical disk reproducing device is operable to switch operations between a low-power operation mode and a high-power operation mode, and includes a liquid crystal element and a polarization beam splitter, which together attenuate, only in the... | 11/20/2007 |
| 7291442 | Photosensitive polymeric material for WORM optical data storage with two-photon fluorescent readout Image formation via photoinduced fluorescence changes in a polymeric medium with two-photon fluorescence readout of a multi-layer structure. Fluorophore-containing polymers, possessing one or more basic functional groups, underwent protonation in the presence of a p... | 11/06/2007 |
| 7289693 | System and method for producing optical circuits A method of fabricating a plurality of composite optical assemblies is disclosed. Each optical assembly includes a first optical element and a second optical element. The method includes the steps of providing a first composite substrate that may be divided into a p... | 10/30/2007 |
| 7282684 | Optical pickup apparatus An optical pickup apparatus is provided with a light source device to emit selectively an ordinary polarized light ray and an extraordinary polarized light ray by controlling a polarization condition of a light flux having a wavelength of λ1; and a light converging... | 10/16/2007 |
| 7280459 | Device for correcting signal modulations A device for reading from and/or writing to optical recording media 10, on which information is present in the form of pits, with a linearly polarized light beam 2. A device for reading from and/or writing to optical recording media 10 w... | 10/09/2007 |
| 7277377 | Optical pick-up device with a polarized light beam converter An optical pick-up device includes a light source (2), a polarized light beam converter (4), a splitter (6), a collimating lens (7), and a photo-detector (9). A linear polarized light beam with a first type of polarized component a... | 10/02/2007 |
| 7272100 | Optical head apparatus The present invention is for providing optical head apparatus that can control scatter occurring at locations along the length of the optical path, when laser beam is transmitted through prism constituting the No. 1 prism structural member and the No. 2 prism struct... | 09/18/2007 |
| 7260029 | Method for correcting influence of thickness unevenness of recording medium, information recording/reproducing apparatus using the same method and optical head unit An optical disk unit of this invention includes a defocus detecting system for detecting a defocus of an objective lens, a thickness unevenness detecting system for detecting a thickness unevenness of a transparent resin layer provided nearest the objective lens of ... | 08/21/2007 |
