Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 8159908 | Photo diode ic A photodetector detecting reflected light components from an optical medium, the photodetector including a first detector divided into eight sections detecting the reflected light components and converting the light components into electrical signals, a first calcul... | 04/17/2012 |
| 8159909 | Optical head, optical drive apparatus, and method for generating tracking error signal An optical head that includes a laser light source, an optical system that applies 0-order diffracted light, +1-order diffracted light, and −1-order diffracted light, which are produced from laser light emitted from the laser light source, onto a recording medium ... | 04/17/2012 |
| 8154962 | Optical pickup and optical information recording and reproducing device An optical pickup equipped with a laser light source which emits light beams of at least three wavelengths for recording/reproducing a plurality of information recording media detects light quantities of the light beams of three wavelengths using one light intensity... | 04/10/2012 |
| 8107331 | Optical disk apparatus, position control method, and optical pickup An optical disk apparatus appropriately adjusts the optical paths of a reference light beam and information light beam in an optical path forming section of an optical pickup, condenses the reference light beam and information light beam using an objective lens, and... | 01/31/2012 |
| 8045427 | Apparatus for optical pick-up An optical pickup includes a light source configured to emit light, a beam splitter configured to transmit or reflect light, an object lens configured to condense the light transmitted by the beam splitter onto an optical storage, and a diffraction grating having a ... | 10/25/2011 |
| 8023369 | Storage system and optical pick-up unit Disclosed herein are aspects of optical tape technology, tape manufacturing, and tape usage. Methods and systems of tape technology disclose optical tape media including: configurations, formulations, markings, and structure; optical tape manufacturing methods, syst... | 09/20/2011 |
| 8009527 | Optical pickup device The optical pickup device according to the present invention includes: a light source which emits a first light at a first wavelength, a second light at a second wavelength and a third light at a third wavelength; an optical path combining unit which combines vector... | 08/30/2011 |
| 8000188 | Optical pickup apparatus and optical disc apparatus including the same An optical pickup apparatus comprising at least: a diffraction grating configured to split first wavelength light into at least a first main beam and first sub-beam, and to split second wavelength light into at least a second main beam and second sub-beam, the diffr... | 08/16/2011 |
| 7995433 | Optical head apparatus and optical disc apparatus 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 | 08/09/2011 |
| 7990819 | Optical head apparatus and optical information apparatus An optical head apparatus is made to be downsized while obtaining an sufficient driving force of an objective lens actuator. The optical head apparatus includes a first optical system including a first objective lens for focusing a light beam upon an optical disc; a... | 08/02/2011 |
| 7969834 | Optical pickup device having a structure providing efficient light usage The optical pickup device according to the present invention includes: a light source which emits light at first, second and third wavelengths; an optical path combining unit which combines vectors of the light at the first, second and third wavelengths which is emi... | 06/28/2011 |
| 7965594 | Optical pickup and optical disc apparatus When recording/reproducing an optical disc having a recording layer of multi-layer structure, an unwanted optical beam reflected from a recording layer other than a target layer for recording/reproduction is incident on a photodetector to cause an unwanted disturban... | 06/21/2011 |
| 7881168 | Optical pick-up apparatus for multi recording/reproducing An optical pickup apparatus is provided for use in a recording/reproducing apparatus to record/reproduce information on/from recording media having different formats. Such an optical pickup apparatus comprises a dual wavelength laser diode; a hologram module arrange... | 02/01/2011 |
| 7876650 | Apparatus comprising a pickup providing three beams for reading data from or writing data to an optical storage medium, and respective optical storage medium The apparatus comprises a pickup with a laser, a detector unit and an objective lens for reading data from or writing data to a Super-RENS optical storage medium having a track pitch below the optical resolution limit, the pickup generating a main beam for reading a... | 01/25/2011 |
| 7835237 | Optical pickup device and information recording/reproducing apparatus There are obtainable reliable and proper tracking correction and CTC even when fluctuations occur in an irradiation position of a sub-beam in a track at the time of performing tracking correction and CTC using three beams. Five beams (a main beam, sub-beams inA and ... | 11/16/2010 |
| 7813235 | Objective lens, optical pick-up device, and optical disk device An optical pickup device includes light sources for respectively emitting a plurality of different wavelengths of light, a unit structured for causing at least a part of the light emitted from the light sources to pass a same optical path; and a focusing unit for fo... | 10/12/2010 |
| 7804747 | Optical pickup which is compatible with multiple types of media A compatible optical pickup can be used with advanced optical discs (AODs), blu-ray discs (BDs), digital versatile discs (DVDs), and compact discs (CDs). The compatible optical pickup comprises a first light source unit for independently projecting first and second ... | 09/28/2010 |
| 7733749 | Beam spot position control device and beam spot position control method, and optical disk recording and reproducing device A beam spot position control device, for controlling multiple beam spot positions irradiated onto an optical recording medium so as to be disposed linearly, includes a light detecting unit for detecting the amount of return light for each of a plurality of beam spot... | 06/08/2010 |
| 7706220 | Photodetector, diffraction grating, optical pickup and optical disc apparatus The present invention provides a photodetector capable of generating highly accurate tracking and focusing error signals free of variations in light quantity caused by interference, in an optical pickup with a two-wavelength multilaser. The photodetector comprises f... | 04/27/2010 |
| 7639574 | Optical pickup An optical pickup including: a monolithic laser light-emitting unit for emitting a first laser beam and a second laser beam having mutually different wavelengths; an one-sided spectrally separating unit for spectrally separating the first laser beam and the second l... | 12/29/2009 |
| 7626900 | Optical pickup and disk drive apparatus In an optical pickup for irradiating a laser beam emitted from a photoemission element on a disk-like recording medium through an objective lens, there is provided a diffraction element including a first region for splitting the laser beam emitted from the photoemis... | 12/01/2009 |
| 7586819 | Optical pickup device An optical pickup device includes a two-wavelength composite light source that can emit laser beams for a CD and for a DVD, a light source that can emit a laser beam for a BD, a hologram element and a photo detector. When spots formed on the photo detector by 0 orde... | 09/08/2009 |
| 7583570 | Optical pickup and disc drive apparatus An optical pickup includes a diffracting element having a plurality of regions for dividing the laser light emitted from the light-emitting element into a main beam and pairs of first, second, third, and fourth sub-beams. When the first to fourth sub-beams form firs... | 09/01/2009 |
| 7438547 | Optical recording medium and master disc for manufacturing optical recording medium An optical recording medium allowing high-density recording, where a groove having a shallow U-shaped cross section wider than certain width, a master for manufacturing optical recording medium, a manufacturing apparatus thereof, and a manufacturing method thereof a... | 10/21/2008 |
| 7420895 | Signal detection method and apparatus and optical recording and/or reproducing apparatus using the same A method and apparatus for detecting a signal to determine on-track/off-track and/or a track cross direction, using a detection signal corresponding to a reflected main light beam and detection signals respectively corresponding to reflected first and second sub lig... | 09/02/2008 |
| 7391684 | Optical disk recording/reproducing apparatus In a processing section 4, allowable gain-value range defining unit 41 measures a gain value k corresponding to a level ratio between an MPP signal and an SPP signal generated by a tracking error signal generating circuit 3 to define an allowabl... | 06/24/2008 |
| 7376055 | Method of annealing optical recording medium There is provided a method of annealing an optical recording medium formed on a substrate having a land and a groove, comprising the steps of: annealing one side wall between the land and the groove with a predetermined laser power; moving the laser to another side ... | 05/20/2008 |
| 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 |
| 7369467 | Optical pickup including polarization holographic optical element and photodetector Disclosed is an optical pickup including a polarization holographic optical element (HOE) and a photodetector. The optical pickup includes a light source, an optical path changer, an objective lens, a polarization HOE, and a photodetector. The polarization HOE has a... | 05/06/2008 |
| 7369466 | Optical pickup apparatus and method for controlling phases of three beams An optical pickup apparatus and method are provided. The apparatus and method include a light source unit having a holder in which an optical module having first and second light sources for emitting light having different wavelengths and a grating are installed, an... | 05/06/2008 |
| 7366078 | Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method 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 wavelen... | 04/29/2008 |
| 7366079 | Optical pickup device and optical disk drive using the same An optical pickup device includes a light source unit an optical system which leads a return light beam to a predetermined light-receiving location and includes an object lens focusing each light beam from the light source unit to a recording surface of a correspond... | 04/29/2008 |
| 7359295 | Optical pickup apparatus and optical disk drive apparatus An optical pickup apparatus for reproducing information from an optical disk, includes: a semiconductor laser applying a beam to an optical disk having two recording layers through an objective lens; and a light receiving device to which light reflected from the opt... | 04/15/2008 |
| RE40229 | Optical recording/reproducing apparatus for optical disks with various disk substrate thicknesses An optical disc apparatus for recording, reproducing or erasing an information signal by converging a light flux onto a recording layer through a transparent substrate. The apparatus includes one or a plurality of optical heads having a plurality of objective lenses... | 04/08/2008 |
| 7355946 | Method of recording signals onto a recording medium A method of recording data onto an optical disk uses a write strategy that corresponds to the recording features of the optical disk. The method detects a track pitch or storage capacity of a recording medium, adjusts a write strategy according to the detected track... | 04/08/2008 |
| 7355933 | Optical pickup device Substantially all of the laser light emitted from laser chip(s) 11 toward optical disk(s) 17 may be transmitted through polarizing hologram(s) 13 and may thereafter be transmitted through quarter-wave plate(s) 15, and after being reflecte... | 04/08/2008 |
| 7352517 | Optical pickup apparatus An optical pickup apparatus for conducting at least recording or reproducing of information on two types of optical information recording media having protective substrates with different thicknesses, includes: a first light source for emitting a first light flux wi... | 04/01/2008 |
| 7349299 | Method of optical disc discrimination A method for discriminating between different types of optical discs is intended to apply to an optical storage device with a pick-up head having three beams. A main beam push-pull signal and a sub-beam push-pull signal, both acquired by means of the photo-detector ... | 03/25/2008 |
| 7349295 | Optical head device A lens holder (101) holds an objective lens (4) and a support shaft (103) is inserted in a bearing hole (101a) in the lens holder (101). Light that is emitted from a light source and reflected by an information recording med... | 03/25/2008 |
| 7345965 | Method for track counting and corresponding apparatus for reading from and/or writing to an optical recording medium In an apparatus for reading from and/or writing to an optical recording medium, it is desirable, in particular in the case of track jumps, to detect the direction of the track jump, i.e. the direction of movement of an objective lens of the apparatus relative to the... | 03/18/2008 |
