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| Number | Title | Issue Date |
| 7848189 | Optical disk apparatus controlling focus and tracking drive in gap and recorded area when adjusting write power It is an optical disk apparatus that comprises: a laser drive device for outputting a test power larger than a prescribed value in a gap section; an optical pickup for forming a beam spot on a disk and detecting reflected light; a focus error detector for detecting ... | 12/07/2010 |
| 7570551 | Servo position adjustment method and servo position adjustment device It is an object of the present invention to provide a method for absorbing individual variance between optical disc devices or optical discs, and for determining the optimal servo adjustment position even with optical discs in which no convex/concave pit string is p... | 08/04/2009 |
| RE39952 | Laser power controller and optical disk device A power control device for controlling a power of a light source of an optical beam directed to an optical medium. The power control device includes a reflected light detector for detecting reflected light from the optical medium when irradiated by an optical beam w... | 12/25/2007 |
| 7242653 | Optical disc apparatus capable of detecting recording characteristics based on a predetermined signal prerecorded and reproduced An optical disk drive apparatus for recording a predetermined signal on an optical disk by varying predetermined recording conditions and detecting recording characteristics based on a reproduction signal of the predetermined signal is provided. The optical disk dri... | 07/10/2007 |
| 7227818 | Magneto-optical data recording/reproducing method A method of recording data into a recording medium by forming a recording region which is physically different from the nonrecorded portions is disclosed. The optical data recording/reproducing method includes a first trial writing operation in which trial writing d... | 06/05/2007 |
| 7173888 | Recording apparatus for and method of improving overwrite characteristics A recording apparatus and method for recording a mark on a recordable recording medium includes an optical pickup having a light source and an objective lens for focusing light emitted from the light source as a light spot on a recording surface of a recording mediu... | 02/06/2007 |
| 7146621 | Optical pickup An inventive optical pickup includes: a base; a movable part; a fixed part; and a first yoke. The movable part, fixed part and first yoke are provided over the base. The movable part is provided with: a hologram element; a package equipped with a laser/photodetector... | 12/05/2006 |
| 7116797 | Optical recording medium and reproducing apparatus In an optical recording medium of the present invention, plural pits which carry main information recorded in a user area and tangential push/pull (T-PP) information required for reproducing the main information recorded in T-PP area are formed. The pit length in a ... | 10/03/2006 |
| RE39013 | Method and apparatus for optical recording and reproducing with tracking servo reducing track offset Disclosed is an optical recording and reproducing apparatus comprising a light source directing a light spot toward a recording medium, a detection system detecting light reflected from the recording medium to derive an electrical signal from the reflected light, an... | 03/14/2006 |
| 6965547 | Tracking and focus servo system with error signal inverse non-linearity calibration A digital servo system of an optical disk drive with a calibrated inverse non-linearity function is disclosed. A look-up table is determined, for example, with a focus error signal gain corresponding with a focus error signal offset so that the response of the focus... | 11/15/2005 |
| 6947233 | Disk drive apparatus and method for compensating for error in servo-information-recorded position between heads In a first mode, an R/W channel starts to monitor read information to thereby detect a servo mark contained in servo information, each time a servo controller generates a servo gate pulse. Upon detecting the servo mark, the R/W channel detects, from the read informa... | 09/20/2005 |
| 6940676 | Triple push-pull optical tracking system A method of generating a composite signal in a closed loop servo signal system of a data recording system used to drive a recording head to any given position within a dynamic range of a servo tracks includes an optical pickup system for generating optical spots foc... | 09/06/2005 |
| 6930964 | Information storage apparatus An information storage apparatus records, reproduces and/or erases information with respect to a recording medium. The apparatus includes a servo error generation detector for detecting a generation of a servo error based on at least one of servo signals including a... | 08/16/2005 |
| 6839194 | Disk drive apparatus and method for generating servo sector pulse A servo mark detector detects a servo mark from each servo information item detected by the servo detector. A counter measures a time period each time a servo mark is detected, thereby measuring a servo interval. A correction circuit corrects a time period T2 | 01/04/2005 |
| 6819639 | Method and apparatus for multi-channel auto-focus A method and apparatus are disclosed for a multi-channel imaging system wherein the beams of light corresponding to each channel can be individually auto-focussed. Individual channel focussing permits image data to be recorded on a surface of variable depth, such as... | 11/16/2004 |
| 6738325 | Optical disk unit capable of reducing tracking offset An optical disk unit, which performs tracking control by generating a tracking error signal based on detection signals of reflected lights of a main light beam for recording and reproduction and sub light beams for tracking, includes a first tracking error generatio... | 05/18/2004 |
| 6700857 | Method and apparatus for controlling light power of optical disk system, and optical disk system having the same Method and apparatus for controlling the light power of an optical disk system, and optical disk system having the same are provided. The optical disk system includes a microcontroller for controlling the operation of the optical disk system, a light powe... | 03/02/2004 |
| 6657934 | Information recording apparatus and method therefor An information recording apparatus and a method therefor which can form a beam guide groove in the shape of highly accurate rectangle having abrupt edges. A recording mark is formed by exposing a recording medium with a recording beam having a beam diamet... | 12/02/2003 |
| 6611479 | Information recording and reproducing apparatus An information recording and reproducing apparatus for scanning with a laser beam along an information track on a recording medium. The information recording and reproducing apparatus has a track offset adjustment circuit to perform track offset adjustmen... | 08/26/2003 |
| 6295569 | Storage apparatus A battery pack is detachably provided for a drive main body. When carrying, an interface card and a connector cable are detachably supported and fixed to the drive main body by a holder member, thereby packaging. A power source is supplied from an upper a... | 09/25/2001 |
| 5726961 | Optical pickup control system for optical discs having different reflectivities An optical pickup control system is provided for recording and reproducing information on various types of discs which have different reflectivities of light. The pickup has a semiconductor laser radiating a laser beam, and a photodetector detecting refle... | 03/10/1998 |
| 5682366 | Optical disc recording apparatus with efficient data checking An optical disc recording apparatus which requires no additional head optical system and is capable of reducing the time required for a data checking operation. By detecting any irregularity of a signal in accordance with reflected light from an optical d... | 10/28/1997 |
| 5610898 | Information recording/reproducing method for recording and/or reproducing information on information recording carrier by use of probe electrode An information recording/reproducing method and apparatus is for carrying out at least one of recording and reproducing information through a probe electrode or through a plurality of probe electrodes on an information recording medium. A probe electrode ... | 03/11/1997 |
| 5541900 | Optical information recording and reproducing apparatus and method for different spot size type media Optical information recording and reproducing apparatus and method of the invention perform the recording and reproducing for various types of information recording media each having a converged laser spot size different from the spot sizes of the other t... | 07/30/1996 |
| 5495466 | Write verification in an optical recording system by sensing mark formation while writing An optical recording system and method which provide verification of recorded data, while the data is being written onto an optical recording medium, by detecting the rate of change of a reflected write pulse. The system includes an optical source for sup... | 02/27/1996 |
| 5461605 | Information recording/reproducing method, recording carrier and apparatus for recording and/or reproducing information on information recording carrier by use of probe electrode An information recording/reproducing method and apparatus is for carrying out at least one of recording and reproducing information through a probe electrode or through a plurality of probe electrodes on an information recording medium. A probe electrode ... | 10/24/1995 |
| 5442609 | Tracking error signal correcting system which adjusts gain such that rending tracking error signals and recording trucking error signals and recording tracking error signals are equal A tracking error generating system is provided for generating a tracking error signal based on a laser beam irradiated on a writable optical disc by a pickup. Test data are recorded on a power calibration area (PCA) of the disc. A recording tracking error... | 08/15/1995 |
| 5440534 | Method and apparatus for maintaining a recording light beam in an on-track position on a recording medium A method and apparatus for, in an optical data recorder, maintaining a recording light beam in an on-track position on a recording medium. In the apparatus an optical head has a tracking arrangement movable in a direction parallel to the recording medium ... | 08/08/1995 |
| 5396477 | Light spot positioning method and optical disc memory apparatus employing the same A light spot positioning method and apparatus for performing a seek operation of positioning a record/playback light spot at a desired track on a recording medium by a macro moving mechanism for an optical head and a micro moving mechanism mounted on the ... | 03/07/1995 |
| 5394385 | Optical information recording/reproducing apparatus for performing positioning of recording/reproducing spot by selection of pairs of photo detecting elements A beam-spot control unit is arranged such that a light beam is irradiated onto an optical recording medium having a plurality of tracks, through an objective lens, to detect reflecting light of beam spots formed on the tracks by three or more photo detect... | 02/28/1995 |
| 5367512 | Multi-beam optical recording-reproduction device with independent error detection for each beam A multi-beam optical recording-reproducing device is capable of detecting the focusing and tracking errors of respective beams independently of each other by means of a simple optical system. The optical system for independent tracking error detection may... | 11/22/1994 |
| 5315578 | Disc recording medium and data recording method In a disc recording medium such as a Compact Disc capable of preventing occurrence of a burst error due to a scratch or a black spot on a disc in which the same data is repeatedly recorded for error correction, at least one adjusting section is inserted i... | 05/24/1994 |
| 5293366 | Information recording and reproducing apparatus provided with means for adding to a tracking signal offset corresponding to the positional deviation of a recording spot and a reproducing spot An apparatus for effecting the recording and reproduction of information on an information track on a recording medium, includes a device for applying a first light spot to the information track to thereby record information, a device for applying a secon... | 03/08/1994 |
| 5257255 | Recording and/or reproducing apparatus with sensor for detecting head speed or acceleration A head for writing data into and/or reading data out of a recording medium such as a magnetic disc is displaced along a path by a motor such as a voice coil motor. The moving member of the motor is disposed on one side of the path, and another moving memb... | 10/26/1993 |
| 5233584 | Optical disk device using high and low data-sensing criteria plus device recalibration for error control Error control procedures are described for an optical disk recorder. High and low criteria for each of a plurality of machine operations or functions of an optical disk recorder are described. Such functions include erasing a sector, writing data, and rea... | 08/03/1993 |
| 5142520 | System for obtaining optimum focusing position in optical disc system A system for obtaining an optimum focusing position in an optical disc system. An optical beam is impinged onto a track of an optical disc, and a reflection signal having information regarding an intensity of an optical beam reflected by an optical disc i... | 08/25/1992 |
| 5107101 | Optical information processing apparatus with peak hold circuit for gain control signal A peak hold circuit for a gain control signal is disclosed for use with an apparatus for recording information on and/or reproducing information from an optical recording medium by scanning the optical recording medium with a condensed light beam. The app... | 04/21/1992 |
| 5107479 | Optical recording/reproducing apparatus An optical recording/reproducing apparatus records an information signal on a rotary optical disk by irradiating an optical beam having an optical power such that an energy sufficient to cause recording of the information signal is incident to a unit area... | 04/21/1992 |
| 5105409 | Method and apparatus for optical recording and reproduction with tracking servo reducing track offset Disclosed is an optical recording and reproducing apparaus comprising a light source directing a light spot toward a recording medium, a detection system detecting light reflected from the recording medium to derive an electrical signal from the reflected... | 04/14/1992 |
| 5042020 | Information recording and/or reproducing apparatus with an optical medium sensor for providing automatic variation in light beam intensity in accordance with various recording medium An information recording and/or reproducing apparatus in which a beam emitted from a light source is applied to an optical recording medium to thereby record and/or reproduce information thereon has a light projecting device for projecting a medium-detect... | 08/20/1991 |
