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| Number | Title | Issue Date |
| 8189448 | Optical information recording/reproducing apparatus and objective optical system for the same 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 ligh... | 05/29/2012 |
| 7792003 | Methods for manufacturing volume Bragg grating elements 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 ... | 09/07/2010 |
| 7697391 | Massively multi-level optical data storage using subwavelength sized nano-grating structures 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... | 04/13/2010 |
| 7668064 | Optical pickup unit and information recording/reproduction apparatus 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 ... | 02/23/2010 |
| 7391703 | Methods for manufacturing volume Bragg grating elements 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 ... | 06/24/2008 |
| 7368222 | Optical data storage media with enhanced contrast Disclosed is an optical data storage medium with enhanced contrast. The optical data storage medium includes a substrate having oppositely facing first and second surfaces. A first metal/alloy layer is formed overlaying the first surface of the substrate. The first ... | 05/06/2008 |
| 7317672 | Optical head An optical head includes the following: a light beam separator (35) that includes substantial interference regions for light that is reflected from an information recording medium and travels in a straight path and ±first-order diffracted light produced by i... | 01/08/2008 |
| 7260049 | Optical pickup device, information reproduction/recording apparatus, and information processing apparatus The present invention provides an optical pickup device that is resistant to noise in a signal or an RF signal outputted from each light receiving member. Current signals outputted from the light receiving members are converted into voltage signals by I/V converters... | 08/21/2007 |
| 7252239 | Method for producing laser-writable data carriers and data carrier produced according to this method The invention relates to a method for producing a data carrier having a laser-markable layer and a transparent optically variable layer overlapping therewith at least in certain areas, wherein visually visible markings that at least partly overlap with the optically... | 08/07/2007 |
| 7251208 | Optical pick-up system for use in an optical disk device including use of improved gratings with more efficient beam diffraction The present invention is an optical pick-up system for use in an optical disk device including more efficient beam diffraction for tracking purposes. The system may be used for one or more types of optical disks (e.g., DVDs, CDs, CD-ROMs). The invention includes a s... | 07/31/2007 |
| 7236449 | Optical recording medium, stamper for producing optical recording medium, recording/reproducing apparatus, and recording/reproducing method On a magneto-optical disk, a first groove Gv1, a second groove Gv2, and a third groove Gv3 are formed so as to be adjacently arranged. The first groove Gv1 and the second groove Gv2 are deep grooves, and the third groove Gv3... | 06/26/2007 |
| 7212489 | Optical disc and method of protecting same An optical disc for storage and retrieval of digital data, and a system and method for protecting the optical disc is disclosed. The optical disc has projections or embossments on one or both surfaces. When the optical disc is placed on a substantially flat surface ... | 05/01/2007 |
| 7210628 | Dynamic solid state diffractive optics applied for reading a diffractive optics memory The apparatus and method of the present invention employ solid state dynamic diffractive optical elements for reading information from a diffractive optics memory. The diffractive optics memory has stored therein information located at a plurality of points of the m... | 05/01/2007 |
| 7203379 | Digital image cross talk correction An image processing system comprises a processing circuitry operable to receive a digital image and a line buffer circuitry communicatively coupled to the processing circuitry, the line buffer circuitry comprising a plurality of line buffers. The processing circuitr... | 04/10/2007 |
| 7184383 | Medium position sensing A method of determining coordinates for a storage medium includes: determining diffraction data from a plurality of diffraction patterns corresponding to diffractive markers of the medium; and combining the diffraction data to determine composite coordinates for the... | 02/27/2007 |
| 7130092 | Apparatus and method for recording and reproducing optical information An optical information recording/reproducing apparatus generates information light by modulating light emitted by a light source device with a light modulator depending on the information to be recorded and generates reference light for recording by modulating the l... | 10/31/2006 |
| 7072114 | Optical pickup using an optical phase plate and which is compatible with optical recording media of different types An optical pickup apparatus having laser light sources emit a first light beam having a relatively shorter wavelength for a DVD and a second light beam having a longer wavelength for a CD-R, an objective lens having a focal length of an information recording surface... | 07/04/2006 |
| 7067238 | Method for manufacturing a substrate for use in a stamper manufacturing process, as well as a substrate obtained by using such a method A method for manufacturing a substrate for use in a stamper manufacturing process and a substrate which is used in stamper manufacturing process to be used in producing optical discs, includes exposing, developing and heating of a photosensitive film that has been c... | 06/27/2006 |
| 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 |
| 6985293 | Optical pickup using an optical phase plate and which is compatible with optical media for different types An optical pickup apparatus having laser light sources emit a first light beam having a relatively shorter wavelength for a DVD and a second light beam having a longer wavelength for a CD-R, an objective lens having a focal length of an information recording surface... | 01/10/2006 |
| 6958967 | Holographic optical information recording/reproducing device An optical information recording/reproducing device reproduces digital data recorded in a form of interference fringes produced by two coherent beams in a hologram disk, by projecting a coherent beam to the hologram disk and receiving a reproduction signal beam obta... | 10/25/2005 |
| 6925039 | Device and method for controlling tilt servo A tilt servo control device of an apparatus for recording information on and reproducing information from an optical recording medium, the apparatus comprising an optical system for leading a laser beam emitted from a light source to a recording surface of the optic... | 08/02/2005 |
| 6908725 | Double-sided hybrid optical disk with surface topology An optical disk has a multi-layer tuned optical coating overlying both small bumps to store pre-recorded information and lands onto which information is written to and read. The optical coating includes a phase-change metal/alloy layer formed over the disk substrate... | 06/21/2005 |
| 6891675 | Optical device There is disclosed an optical device in which a first light source for outputting a first wavelength light is apart from a second light source for outputting a second wavelength light by a predetermined distance. An information recording medium is irradiated with th... | 05/10/2005 |
| 6850625 | Information storage method, information storage device and recording medium Information to be stored is input to a plurality of information carrier storage means that interact with each other. A unit amount of information carriers is added to a position selected from the information carrier storage means, and nonlinear diffusion of informat... | 02/01/2005 |
| 6791938 | Optical recording medium, master disc for the preparation of the optical recording medium and optical recording and/or reproducing apparatus An optical recording medium used as a recording medium for information signals in which, in forming a groove along a recording track, a first groove and a second groove are formed to a first depth x to describe a double helix and a third groove having a second depth... | 09/14/2004 |
| 6775221 | Optical pickup and recording and/or reproducing apparatus An optical pickup provided with a semiconductor laser for outputting a linear polarized laser beam, an objective lens for condensing a laser beam from the semiconductor laser and supplying the same to a track of an optical disk with lands and/or grooves formed there... | 08/10/2004 |
| 6597642 | Photodetector unit, and optical pickup, optical reproduction apparatus, and optical recording apparatus equipped with the same An optical pickup that is equipped with a photodetector unit, irradiates an optical disc with a laser beam, and receives returning light reflected by the optical disc, where the optical pickup is constructed to (1) divide the laser beam into a main beam, ... | 07/22/2003 |
| 6583933 | Reflective diffraction grating Reflective diffraction grating. A focused ion beam (FIB) micromilling apparatus is used to store color images in a durable medium by milling away portions of the surface of the medium to produce a reflective diffraction grating with blazed pits. The image... | 06/24/2003 |
| 6363046 | Optical recording/pickup head compatible with a digital versatile disk (DVD) and a recordable compact disk (CD-R) using a holographic variable aperture An optical recording/pickup head having compatibility with a recordable compact disk (CD-R) and a digital video disk (DVD) transmits a first light beam having a wavelength of 635 nm for a DVD emitted from a first light source and a second light beam havin... | 03/26/2002 |
| 5995481 | Light-readable recording disc utilizing half-wavelength pits or bumps and system for reading such discs An improved light-readable information recording disc is provided in which the optical data storage structure consists of either lands and pits or lands and bumps, in which the depth of the pits or the height of the bumps, respectively, is controlled to a... | 11/30/1999 |
| 5923633 | Optical reproducing device compatible with multiple media recording densities A reproducing apparatus of an optical recording medium which is capable of reproducing at least two types of optical recording mediums including an optical recording medium, such as a so-called compact disk composed of a substrate having a thickness of 1.... | 07/13/1999 |
| 5872749 | Arrangement for reading an optically readable carrier The present invention concerns an arrangement for reading an optically readable carrier on which data is stored in the form of diffractive elements. The data elements each have a plurality of adjacent tracks on the carrier with data elements being positio... | 02/16/1999 |
| 5751680 | Optical disk drive Concerning a tilt detecting optical pickup in an optical disk playback device, a highly precise tilt error signal can be obtained by a simple structure. As a structure for achieving this, there are provided a diffraction grating, on which a grating groove... | 05/12/1998 |
| 5523989 | Optical disk drive having functions of detecting disk tilt from difrraction pattern of track and compensating disk tilt with use of comatic lenses An optical disk drive of the present invention includes: a light source for emitting a light beam; an optical system for radiating the light beam onto a desired track formed on an optical disk; a light receiving element for receiving the light beam reflec... | 06/04/1996 |
| 5502708 | Optical scanning device In a combined optical and magneto-optical recorder, data stored in pits and a magnetic layer may be simultaneously detected with an optical scanning device. Reflected light is divided by a polarizer and directed to one of two photodetectors depending on t... | 03/26/1996 |
| 5493553 | Method and apparatus for preventing cross-talk during reproduction of data recorded on a high density recording medium A method and system for preventing cross-talk during reproduction of data recorded on a high density recording medium. The method includes the steps of receiving signals from at least three consecutively parallel information tracks on a recording medium, ... | 02/20/1996 |
| 5459707 | Read/write CD ROM system using an electro-optic modulator to crosstalk In a CD system of the type which stores data in both pits and magnetic domains, crosstalk injected into the signal recovered from the magnetic domains is significantly reduced by causing the modulator used to record the magnetically stored signal, to rapi... | 10/17/1995 |
| 5373500 | Optical readable carrier with diffractive tracks containing information bearing irregularity The present invention concerns an arrangement for reading an optically readable carrier having a substrate with diffractive tracks with respective longitudinal axes and formed of a succession of irregularities with respect to a smooth reference surface. T... | 12/13/1994 |
| 5339306 | Detecting interferential diffraction of a reflected beam from a polymer liquid crystal recording medium A memory medium includes a memory layer of a polymer liquid crystal and a reflection layer disposed on a substrate. A record part having a different refractive index from that of a non-record part is formed in the memory layer so that the record part and ... | 08/16/1994 |
