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| Number | Title | Issue Date |
| 8189434 | Optical pickup unit and optical pickup device having same and information writing/reading device having same An optical pickup device includes: a splitting section for splitting a beam; a light-receiving section for receiving the split beams. The light-receiving section includes: a tracking-use main light-receiving region and tracking-use sub light-receiving regions, and a... | 05/29/2012 |
| 8189435 | Spherical aberration detecting device and an optical pickup device including same A photoreceiver includes: a first light-receiving section divided into two regions by a border extending in a radial direction, and is disposed in a portion where it can receive a +1st order diffraction ray of the main beam from the polarization hologram, so as to d... | 05/29/2012 |
| 8189436 | Optical drive device and amplification rate determining method An optical drive device generates a first push-pull signal and a first sum signal based on a light receiving amount in two light receiving areas of which each width in a signal light tangent direction is smaller than a diameter of a spot of signal light, generates a... | 05/29/2012 |
| 8139450 | Amplifier circuit and optical pickup device An amplifier circuit and an optical pickup device supporting multi-layered optical discs and hi-speed play mode. The amplifier circuit includes photodiodes 11 to 15; operational amplifiers 21 to 25; feedback resistors 31 to 34; | 03/20/2012 |
| 8125862 | System and method for controlling tracking in an optical drive The present techniques provide methods and systems for alignment of a read head with data tracks on an optical data disk. In embodiments, a multi-pixel detector that is segmented into multiple areas, or detector segments, may be used to detect a pattern in the light... | 02/28/2012 |
| RE43105 | Tracking error detection method and optical disc reproduction apparatus using the same An object of the present invention is to improve a conventional DPD method having a problem that a tracking servo becomes unstable due to a reduction in the accuracy of detecting a phase difference between short mark signals at an edge, in a case where the amplitude... | 01/17/2012 |
| 8000189 | Optical pickup and optical disk device An optical pickup includes: a light source that emits a light beam; an object lens that condenses the light beam on a target recording layer of an optical disk; a lens moving unit; a condensing lens; a hologram element that diffracts, in diffracting a reflected ligh... | 08/16/2011 |
| 7969836 | Optical pickup apparatus An optical pickup apparatus reads an information signal recorded on a recording surface of an optical disk along a track by projecting a light beam. Said optical pickup apparatus has: an objective lens for converging said light beam onto said recording surface; an o... | 06/28/2011 |
| 7952966 | Tracking apparatus for optical information reproduction apparatus A tracking apparatus for an optical information reproduction apparatus includes the following: a photoelectric detector (1) in which a far-field pattern of a light spot converged on a recording medium is formed across a divided light-receiving cell; an arithm... | 05/31/2011 |
| 7885152 | Single spot cross-correlation tracking A tracking error (TE) signal is formed from a single spot on a photodetector 25 to improve the robustness in optical disc applications having a reduced track-pitch. Reduced track pitches are employed in high data capacity optical disc formats. By using high f... | 02/08/2011 |
| 7859955 | Apparatus for recording/reproducing holographic data and method of adjusting position of recording layer An apparatus for recording/reproducing holographic data and a method of adjusting a position of a recording layer. While an objective lens focusing first and second lights having different wavelengths on a holographic data storage medium including first and second r... | 12/28/2010 |
| 7817509 | Optical pickup apparatus and beam splitter There is provided an optical pickup apparatus and a beam splitter which are capable of suppressing an adverse effect resulting from light reflected by a non-light-condensed layer that is different from a light-condensed layer. In respective TES light-receiving secti... | 10/19/2010 |
| 7791989 | Arithmetic processing circuit unit and disc device By inputting differential signals to transistors Tr21a to Tr21d and Tr22a to Tr21d, an addition operation is performed on the four differential signals, and a filter operation is performed by a capacitor C21... | 09/07/2010 |
| 7764578 | Tracking error detection method and optical disc reproduction apparatus using the same An object of the present invention is to improve a conventional DPD method having a problem that a tracking servo becomes unstable due to a reduction in the accuracy of detecting a phase difference between short mark signals at an edge, in a case where the amplitude... | 07/27/2010 |
| 7760593 | Information/recording/reproducing apparatus including ΔΣ conversion circuit Provided is an information recording/reproducing apparatus which can perform servo control with a simple circuit structure and can be manufactured at a low cost. Analog output signals from a plurality of separate portions of a photosensor which receive reflected lig... | 07/20/2010 |
| 7751286 | Optical pickup unit and information recording apparatus using the same An optical pickup unit for recording information on and/or reproducing information from a multilayer information recording medium including multiple recording surfaces in each of which a guide groove on which the information is to be recorded is spirally formed is d... | 07/06/2010 |
| 7746736 | Optical head and optical disk device capable of detecting spherical aberration An optical head comprising a light source, objective lens, light splitting means, light receiving element, tracking error signal detection means, and spherical aberration detection means. Light splitting means has six regions divided by a first splitting line parall... | 06/29/2010 |
| 7697383 | Optical disc reproducing apparatus In the first and second light-receiving regions equally divided into two in parallel with the track of the optical disc, the reflected light received from the optical disk is converted into electric signals and fed out by individual light-receiving regions. Then, th... | 04/13/2010 |
| 7672202 | Optical pickup apparatus An optical pickup apparatus comprising: a diffraction grating including a first grating for diffracting a first laser light beam, and a second grating for diffracting a second laser light beam which is shorter in wavelength than the first laser light beam, the diffr... | 03/02/2010 |
| 7672201 | Diffraction grating, light-receiving element, and optical head and optical recording/reproducing apparatus utilizing them The invention relates to a diffraction grating, a light-receiving element, and an optical head and an optical recording/reproducing apparatus utilizing them and provides a diffraction grating and a light-receiving element capable of detecting a signal of high qualit... | 03/02/2010 |
| 7606123 | Light receiving and emitting integrated device, optical pickup provided therewith, and optical disk apparatus A light receiving and emitting integrated device is provided that can be connected to an IC for an optical pickup of the discrete package type, regardless of use of the knife edge method for a focus servo signal. In the light receiving and emitting integrated device... | 10/20/2009 |
| 7590034 | Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method of controlling servo of disk recording/reproducing apparatus, method of detecting tracking error, and method of detecting tilt error An apparatus for recording data on and reproducing data from the disk in which a recording area is divided into sectors, includes a reproducing signal generator for generating a reproducing signal including sum signals V1 and V2 of radial pairs, a sum ... | 09/15/2009 |
| 7580332 | Optical pickup, optical disk drive, light detecting apparatus, and signal generating method for optical pickup An optical pickup includes a light source, an objective lens, light detectors, an optical system, and an error-signal generator. The light-receiving surface of at least one of the light detectors has a width extending in a first direction corresponding to a radial d... | 08/25/2009 |
| 7558170 | Optical pick-up head, optical information apparatus, and optical information reproducing method An optical information apparatus of the present invention includes: an optical pick-up head including: a light source; a diffraction unit; a condensing unit; a beam splitter; a photodetector; and a tracking error signal generator. An optical recording medium has tra... | 07/07/2009 |
| 7535806 | Apparatus and method for detecting laser dropout Improvements to an optical recording apparatus comprising a laser light source are provided. The improvements include installing a photodiode in an optical path of at least a portion of the laser light beam from the laser light source, and connecting said photodiode... | 05/19/2009 |
| 7522487 | Light receiving amplifier circuit and optical pickup device having the same In a light receiving amplifier circuit, a dummy amplifier has an identical structure with an IV amplifier except that the dummy amplifier is not connected to a light receiving element and includes a capacitor, i.e., a band limiting capacitor. Further, the capacitor ... | 04/21/2009 |
| 7463561 | Optical pick-up head, optical information apparatus, and optical information reproducing method An optical information apparatus of the present invention includes: an optical pick-up head including: a light source; a diffraction unit; a condensing unit; a beam splitter; a photodetector; and a tracking error signal generator. An optical recording medium has tra... | 12/09/2008 |
| 7460448 | Optical pick-up head, optical information apparatus, and optical information reproducing method An optical information apparatus of the present invention includes: an optical pick-up head including: a light source; a diffraction unit; a condensing unit; a beam splitter; a photodetector; and a tracking error signal generator. An optical recording medium has tra... | 12/02/2008 |
| 7450477 | Optical pickup having a polarization beam splitter An optical pickup which can remove birefringence due to the non-uniformity of an optical recording medium by using a polarization beam splitter. The optical pickup includes a light source emitting a laser beam, a beam splitter reflecting part of incident light and s... | 11/11/2008 |
| 7440364 | Tracking error signal generation device and tracking error signal generation method A detection signal S1 outputted from a light reception unit (11A) of detection elements (11) formed by four-division light reception element is added to a detection signal S4 outputted from a light reception unit (11D) so as to obt... | 10/21/2008 |
| 7440367 | Land Pre-Pit data detection apparatus and method thereof An apparatus and method has a capable of precisely detecting Land Pre-Pit (LPP) data recorded on an optical medium loaded into an optical drive. The apparatus includes an LPP data detecting unit that detects LPP data, from which a wobble frequency is removed, from a... | 10/21/2008 |
| 7432487 | Device for correcting output of optical pickup Light receiving elements for receiving a + one-dimensional light divided into four are arranged in the vicinity of a light receiving part for receiving the zero-dimensional light. Some light receiving elements configure the light receiving elements of a first group ... | 10/07/2008 |
| 7426172 | Optical module and optical pickup including the same An optical pickup includes an optical module that detects an information signal and/or an error signal by radiating light to a recording medium and receives light reflected by the recording medium. The optical module includes a light source; an optical path changer ... | 09/16/2008 |
| 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 |
| 7411872 | Servo-tracking and three-dimensional alignment in page-based data optical storage A system for page-based optical data storage includes a sensor array positioned to track a data page when the data page is optically read from or recorded to a storage medium. A servo mechanism is used to position the sensor array. A plurality of alignment points ar... | 08/12/2008 |
| 7409461 | Dynamic file-based routing in a broadband communications system Methods and systems consistent with the present invention provide broadband subscribers with dynamic, automatic routing information for accessing services offered by a service provider network (35) and/or content provider networks (40, 45). Client soft... | 08/05/2008 |
| 7397736 | Optical disc device and tracking controlling method therefor Disclosed is an apparatus which includes a tracking error detection circuit, for detecting tracking error signal from outputs of a photodetector, a peak/bottom detection circuit for detecting peak and bottom values of the tracking error signal, a difference circuit ... | 07/08/2008 |
| 7394049 | Optical disk apparatus and pickup unit An optical disk apparatus includes a light emitting unit, a light detecting unit, a tracking error signal generating unit, and a tracking control unit. The light emitting unit emits a single light beam onto an optical disk. The light detecting unit includes at least... | 07/01/2008 |
| 7385888 | Tracking system with dual differential signals with fraction of A/C signal added back to D/C signal Tracking system for guiding an optical beam on tracks on an optical disc, said tracking system comprising a photodetector (A1, A2) for detecting optical beams derived from said optical beam, said photodetector generating a first output signal (A) and a... | 06/10/2008 |
| 7379399 | Optical disc, and reading system and manufacturing method of the disc A writable optical disc has an information writing track, and a guiding track for introducing a laser beam to the information writing track. The guiding track has prepit information recorded thereon, the prepit information including at least address information of t... | 05/27/2008 |
