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| Number | Title | Issue Date |
| 7492675 | Digital servo system with calibrated notch filters A system which calibrates notch filters in a digital servo system is presented. A notch filter can be calibrated by obtaining a frequency response curve of the digital servo system in a range of frequencies, searching the frequency response curve for at least one pe... | 02/17/2009 |
| 7492676 | Optical pickup and optical disc apparatus including the same An optical pickup for recording/reproducing information on/from an optical disc having recording layers, includes a light source; an objective lens for condensing an optical beam emitted from the light source on the recording layer; a photo-detector having a light-r... | 02/17/2009 |
| 7444047 | Multiplexing optical system A multiplexing optical system includes collimator lenses, a first condensing lens, a second condensing lens and an optical fiber. The collimator lenses collimate divergent laser beams that have been emitted from semiconductor lasers. The first condensing lens conden... | 10/28/2008 |
| 7394732 | Object lens drive device, and disc recording and/or reproducing apparatus The present invention is directed to an object lens drive device adapted for moving an object lens in a focus direction of optical axis direction and in a tracking direction perpendicular to the optical axis direction, and includes a fixed position provided in such ... | 07/01/2008 |
| 7388215 | Pattern drawing method, stamper manufacturing method, and pattern drawing apparatus A pattern drawing method capable of drawing a pattern such that opposite ends of a formation region on an inner periphery side and an outer periphery side are substantially linearly formed. A drawing beam is intermittently irradiated N times onto a generally belt-sh... | 06/17/2008 |
| RE40329 | Single objective lens for use with CD or DVD optical disks An optical disk reader or read/write system for CD or DVD formats. First and second laser diodes operating at different wavelengths have their output beams collimated and directed at a single element objective lens, and are then reflected off the disk back through t... | 05/20/2008 |
| 7372784 | Optical head apparatus The present invention proposes an optical head apparatus provided with light-blocking structure that can reliably prevent nonessential light from reaching the photo detector, without being an impediment to miniaturization and flattening, moreover, without increasing... | 05/13/2008 |
| 7358471 | Optical head device An optical head device includes a light source which emits a light beam, an objective lens which condenses the light beam on the optical disk, a condensing lens which condenses reflected light from the optical disk, a liquid crystal panel disposed near a focal point... | 04/15/2008 |
| 7355798 | Optical system for collimating elliptical light beam and optical device using the same An optical system (20) for efficiently collimating an elliptical light beam includes a light source (21), a collimator (22), and at least one prism (23,24). The light source is adapted for providing an elliptical light beam defining diffe... | 04/08/2008 |
| 7345981 | Optical pickup An optical pickup including an optical member which inhibits interference light reflected from an adjacent layer from being received by a photodetector when an optical information storage medium includes a plurality of recording layers on at least one side thereof. ... | 03/18/2008 |
| 7305689 | Optical recording medium and disc cartridge An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change... | 12/04/2007 |
| 7301869 | Spherical aberration correcting method and apparatus In a spherical aberration correcting apparatus, a test recording unit is configured to perform a test recording on an optical disk. A characteristic obtaining unit is configured to obtain a characteristic corresponding to a parameter by the test recording. The param... | 11/27/2007 |
| 7272099 | Exposure apparatus of an optical disk master, method of exposing an optical disk master and pinhole mechanism An exposure apparatus of an optical disk master having a laser source, a deflector for deflecting a recording laser beam obtained based on the laser beam of the laser source and an objective lens for focusing the recording laser beam on an optical disk master, has a... | 09/18/2007 |
| 7272083 | Optical head device and method for correcting spherical aberration On an optical disk in a recording and/or playback apparatus, the position at which the thickness error of a light transmission layer is in the optical axis of an objective lens 11, and the position at which the recording/playback of information is performed i... | 09/18/2007 |
| 7239595 | Spherical aberration correction control device and optical disc apparatus A spherical aberration correction control device for controlling a spherical aberration correction section for correcting a spherical aberration of an optical beam irradiating an optical disc. The spherical aberration correction control device includes a spherical a... | 07/03/2007 |
| 7230722 | Shadow moire using non-zero talbot distance A method for measuring deformation in specimens is provided. The method includes providing a shadow moiré system, the shadow moiré system including an illumination source, a reference grating and an image capture device and providing a specimen. The method further... | 06/12/2007 |
| 7190656 | Apparatus and method for controlling tracking and focusing servo in a holographic digital data storage system A holographic storage system includes a beam supplying unit for supplying an incident beam including data read from a plurality of tracks on a holographic medium; a transferring unit for receiving the incident beam and producing a focused beam; a tracking servo unit... | 03/13/2007 |
| 7185989 | Color separation device, imaging optical engine, and projection apparatus A color separation device according to the present invention comprises a first color separation member having a first polarization direction changing element and a second polarization direction changing element, and a first polarization separation element, and a sec... | 03/06/2007 |
| 7184386 | Integrated type optical head with sheet waveguide and light coupler An integrated optical head is provided. In the integrated optical head, a light source emits light. A waveguide guides the light. An input coupler is located at one edge of the waveguide, and couples light emitted from the light source and transmits the coupled ligh... | 02/27/2007 |
| 7177259 | Optical head and optical recording medium drive device The present invention is directed to an optical head adapted for performing recording or reproduction of information signals with respect to an optical disc (102), which controls light coupling efficiency with respect to light beams irradiated onto the optica... | 02/13/2007 |
| 7158450 | Optical element, optical head, optical recording reproducing apparatus and optical recording/reproducing method The invention presents an optical element with which an optical head can be configured, in which there is little deterioration of the correctional effect when the objective lens shifts, as well as an optical head and an optical recording/reproducing apparatus using ... | 01/02/2007 |
| 7142497 | 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... | 11/28/2006 |
| 7136332 | Optical pickup device An optical pickup device has a semiconductor in which 2 light emitters laser emitting laser beams having different wavelengths for a DVD and CD are mounted on one package and disposes optical-system lenses with reference to a main beam for a DVD such that a long axi... | 11/14/2006 |
| 7133171 | Double facing double storage capacity A first holographic data storage device has a first set of holograms stored thereon. A second holographic data storage device has a second set of holograms stored thereon. An opaque layer is disposed between and attached to one side of the first and the second holog... | 11/07/2006 |
| 7099240 | Information-signal recording and reproducing apparatus A recording medium has first and second areas on which first and second information signals are recorded respectively. The first information signal has a size Ya. The second information signal has a size Yb. A head operates for reproducing the first and second infor... | 08/29/2006 |
| 7088659 | Optical disk apparatus and tilt detection method An optical disk apparatus includes a laser diode, and a light from the laser diode becomes a parallel light by a collimator lens, which is reflected toward an object lens by a reflection mirror. The parallel light transmitted through a through-hole provided on an ob... | 08/08/2006 |
| 7072269 | Method for recording information in optical information medium and reproducing information therefrom An optical head apparatus is provided with a first laser element, a second laser element and a polarized beam splitter. The first laser element emits a laser beam having a first wavelength. The second laser element emits a laser beam having a second wavelength. The ... | 07/04/2006 |
| 7068576 | Optical disc recording and/or reproducing apparatus and aberration adjustment method The astigmatic aberration in an optical system is to be adjusted. Specifically, in an optical disc device on which can be selectively loaded a first optical disc having a first index of double refraction or a second optical disc having a second index of double refra... | 06/27/2006 |
| 7061691 | Optical lens and method of producing the same, method of producing optical lens array, focus error signal production method, and optical pickup apparatus An optical lens whose focal length is different on first and second planes perpendicular to each other is provided. The optical lens is configured such that a convex element, which is formed integrally with a substrate having a flat face, has a convex curved face th... | 06/13/2006 |
| 7048388 | Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus A projection optical system guiding and projecting a light beam from a projected object surface onto a projection surface in an upstream-downstream direction through a transmission dioptric system and a reflection dioptric system. An intermediate image surface of th... | 05/23/2006 |
| 7046590 | Objective lens drive device, and disk recording and/or reproducing device The present invention is directed to an object lens drive device adapted for moving an object lens (21) in a focus direction of optical axis direction and in a tracking direction perpendicular to the optical axis direction, and comprises a fixed portion (1... | 05/16/2006 |
| 7042819 | Optical pickup apparatus An object of the present invention is to provide an optical pickup apparatus which changes characteristics of a light-emitting device or hologram to reduce problems of track servo deviation due to scratches on a surface of an optical disc. By aligning a photorecepti... | 05/09/2006 |
| 7038978 | Optical information recording and reproducing apparatus for recording information bits into an optical disk in a three dimensional arrangement The optical information recording and reproducing apparatus includes a light source for emitting a light beam, an objective lens for converging the light beam emitted from the light source to an information recording medium, and a light detector for detecting the li... | 05/02/2006 |
| 7012876 | Optical scanning head An optical head (1) for scanning optical record carriers (2) is provided with a compensator (16) for compensating spherical aberration of the objective system (18) or defocus of the collimator lens (14) caused by operation of the o... | 03/14/2006 |
| 7006411 | Optical pickup unit having electro-optical element and information recording and reproduction apparatus An optical pickup unit includes a light source emitting a light beam, an objective lens focusing the light beam onto an information recording medium, a light detection part receiving the light beam reflected from the information recording medium, and a light blockin... | 02/28/2006 |
| 6999400 | Lens, optical pickup device, and method for detecting lens inclination A lens includes a plane surface whose normal direction virtually conforms to an optical axis direction, and a reflecting part is provided on the plane surface to reflect only light within a predetermined waveband. Consequently, inclination of the lens can be detecte... | 02/14/2006 |
| 6980496 | Information recording/reproducing apparatus An information recording/reproducing apparatus includes an optical device, a photo-detector and a calculation unit. The optical device irradiates light beams, including one main beam and at least two sub-beams with respect to an information recording medium. The pho... | 12/27/2005 |
| 6974938 | Microscope having a stable autofocusing apparatus The apparatus for automatically focusing an image in a microscope includes onto an object plane includes an optical system configured to form an optical image of a sample plane to be observed, an autofocusing detection system, and a focus correction system. The auto... | 12/13/2005 |
| 6965727 | Information record medium and apparatus for reproducing the same An information record medium (1) is provided with: an audio information recording area on which a plurality of audio information (210) which are different in recording method are recorded; and a control information recording area on which control infor... | 11/15/2005 |
| 6961291 | System for enhanced astigmatic focus signal detection An auto-focus system for a DVD reader or other optical access unit which reads and/or writes information from/to at least two information layers on an optical storage medium such as a DVD or DVR. The auto-focus system includes an astigmatic lens. A confocal aperture... | 11/01/2005 |