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| Number | Title | Issue Date |
| 5621709 | Tracking servo apparatus A tracking servo apparatus having a device for detecting the degree of disk eccentricity. At least either the pulse width or the peak value of brake pulses is controlled upon track jump in accordance with the detected degree of disk eccentricity. This all... | 04/15/1997 |
| 5553051 | Increased intensity optical recording medium with adjacent grooves of different optical depth and a method and apparatus for reproducing the same An optical recording medium on which information is recorded by irradiating the medium with a light spot to cause a characteristic change of an actual reflection factor, the optical recording medium including grooves of different optical depths which exte... | 09/03/1996 |
| 5548576 | Optical recording medium and data reproducing apparatus for reproducing data from such optical recording medium An optical recording medium from which data is reproduced by use of a light beam scanning the optical recording medium, the optical recording medium has a recording area on which marks each of which has an optical singularity are formed at a density so th... | 08/20/1996 |
| 5548568 | Optical-information-recording apparatus having fine and rough driving control An information recording-reproducing apparatus for optically effecting the recording and/or reproduction of information on a disk-like recording medium having a plurality of tracks thereon includes an optical head for applying a light beam for effecting t... | 08/20/1996 |
| 5485440 | Optical information recording/reproducing apparatus comprising digital servo device for performing focusing and/or tracking of optical head based on digital information An optical information recording/reproducing apparatus for recording and/or reproducing information on and/or from an optical memory medium includes an optical system for forming a light beam spot for recording and/or reproducing information on and/or fro... | 01/16/1996 |
| 5483511 | Multiple beam optical memory system with solid-state lasers An optical memory system employing multiple reading/writing optical beams from solid state lasers for simultaneously reading from a writing to multiple tracks of optical media to allow reading/writing of closely spaced adjacent tracks, a number a feature ... | 01/09/1996 |
| 5481508 | Magneto-optic recording medium method of manufacturing the same and magneto-optic recording system A unit recording medium, having on a substrate a first magnetic layer whose Curie temperature is low and also having on the first magnetic layer a second magnetic layer whose Curie temperature is high, is heated by a heating device. After two such unit re... | 01/02/1996 |
| 5481386 | Flying type optical head integrally formed with light source and photodetector and optical disk apparatus with the same The optical head is arranged such that a semiconductor laser and a photodetector are formed via a buffer layer on the same substrate; and an opening portion is formed in the substrate under the semiconductor laser and the photodetector. This optical head ... | 01/02/1996 |
| 5479388 | Servo control system for head recording and/or reproducing information on and/or from recording medium A servo control system for controlling position of a readout head such as a magnetic or optical head which records, reproduces or erases information on or from a magnetic or magneto-optical disk. This servo control system includes an actuator for moving t... | 12/26/1995 |
| 5479386 | Lens actuating system for an optical disk drive having a driven mass for cancelling forces A lens actuating system for an optical disk drive has an objective lens movably mounted in a movable frame with orthogonal X-, Y-, and Z-axes. A seeking servo moves the frame in the X-direction. A tracking servo moves the objective lens in the X-direction... | 12/26/1995 |
| 5477517 | Method for the recording and reproducing of data A method for recording and reproducing compressed data to improve the utilization of the storage capacity of a moving recording medium. The data are compressed prior to a recording step. Prior to reproduction the data are expanded to retrieve the original... | 12/19/1995 |
| 5475662 | Optical disc apparatus with tracking error compensation An optical disc apparatus, which uses an optical disc having a signal recorded on both hollow and convex portions of tracks, provides stable tracking control. An offset judging circuit judges whether the signal has been recorded only on either of two reco... | 12/12/1995 |
| 5475669 | Information reproducing method and apparatus for counting the number of errors and warning An information reproducing method comprises a reading out step for reading out information added with an error correction code from a recording medium, a correcting step for correcting errors of the information read out, and a generating step for generati... | 12/12/1995 |
| 5475666 | Optically modulated overwritable recording device A recording device for recording information upon optically modulated overwritable magneto-optical recording medium including four magnetic layers first records DC "1" and then a test signal at high and low recording laser power levels upon a test track o... | 12/12/1995 |
| 5475670 | Deflection plate for optical pick-up device A deflection plate for deflecting laser beams includes a transparent plate on which two grating areas are formed on the same surface. The first grating area has a plurality of parallel grooves. The second grating area has a plurality of grooves in a prede... | 12/12/1995 |
| 5471446 | Optical disk player having beam correction means An optical disk player having a tracking servo apparatus and a focusing servo apparatus. By amplifying a focusing error at a predetermined gain and adding it to a tracking error, the rolling which occurs due to a mass balance distortion of a pickup is ele... | 11/28/1995 |
| 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 |
| 5457673 | CD-ROM reproduction apparatus A CD-ROM reproduction apparatus which allows error correction for both audio data and CD-ROM data using a single error correction circuit with a miniaturized size. The CD-ROM reproduction apparatus comprises, in addition to the single error correction cir... | 10/10/1995 |
| 5457670 | Optical disk information recording apparatus and reproducing apparatus having a plurality of read or write beams Optical disk information recording apparatus and reproducing apparatus are designed to efficiently improve the transfer rate in information recording and reproduction, and have compatibility with the existing recording apparatus and reproducing apparatus ... | 10/10/1995 |
| 5453964 | Data processing circuit for disc player A reproduced data processing circuit having a subcode delimit information generator to generate subcode delimit information, which indicates a delimiter of the subcode, in response to at least one of two subcode sync signals detected from the subcode incl... | 09/26/1995 |
| 5450386 | Optical disk device including a support member for movably supporting an objective lens in focusing and radial directions with respect to an optical disk An optical disk device includes a light source, an objective lens, a box body and a supporting member. The light source is provided so as not to move to the apparatus body. The box body holds the objective lens. The box body is supported movably to the ap... | 09/12/1995 |
| 5448540 | Device for detecting the position of a recording/reproducing element A device for detecting the position of a recording/reproducing element, which is provided with two position detecting elements having the same input/output characteristics and a device for generating a difference signal representing the difference between... | 09/05/1995 |
| 5448535 | Head position control device A head position controlling device in which the head position may be controlled accurately even with a magneto-optical disc having regions with different reflectance values. A gap sensor consisting of a light emitting element 5 and light receiving element... | 09/05/1995 |
| 5446709 | Image filing apparatus An image filing apparatus comprises a drive device which is loaded with an optical disk capable of storing a plurality of signals, and with which image signals representing images and subsidiary information belonging to each of the images are stored on th... | 08/29/1995 |
| 5444581 | Rotary head for use in a magnetic recordiang and reproducing apparatus wihich includes height adjuster A rotary head for use in a magnetic recording and reproducing apparatus includes a fixed cylinder, a rotary cylinder opposed to the fixed cylinder, two electrically controllable movable elements mounted on the rotary cylinder so as to be 180° apart from ... | 08/22/1995 |
| 5444684 | Seek control system of dual processor magneto-optic disk unit A seek control system is used for a magneto-optic disk unit which has an optical head driven by a VCM positioner, two lens actuators disposed on the optical head, and respective object lenses disposed on the lens actuators for passing first and second bea... | 08/22/1995 |
| 5444683 | Optical reporting reproducing device having fixed and movable optical systems An optical record reproducing device including a movable optical system for moving along a radial direction of an optical disc, a separated optical system including a light source and a separated fixed optical system, a tracking control system having a re... | 08/22/1995 |
| 5444686 | Method and apparatus for correcting distortion in compact disc recording and playback system Method and apparatus for correcting distortion in a CD recording and playback system is disclosed. In an improved CD recording and playback system of the present invention, a complex reference signal having precisely defined amplitude and frequency proper... | 08/22/1995 |
| 5442604 | Access control device An access control device for use in an optical disk system provided with an information recording disk medium having a concentric or spiral track for recording information thereon, a recording/reproducing head for recording information on or reproducing i... | 08/15/1995 |
| 5442612 | Digital signal reproduction devices, integrated circuits for use therewith, and digital signal reproduction methods A digital signal reproduction device including a data strobe circuit high in margin against noise and rapid in recovery from dropout of data and a digital signal reproduction method performed in such device. The digital signal reproduction device includes... | 08/15/1995 |
| 5438559 | Method for locating physical sectors in a fixed block architecture embedded servo disk file #14 A data recording disk file is provided with a fixed block architecture sector format that eliminates the ID region. The servo region contains sector identification information in the form of a start-of-track indicating mark recorded in a selected sector o... | 08/01/1995 |
| 5436876 | Optical head and optical memory device A small and inexpensive optical head for detecting a recorded signal, a focusing error signal and a tracking error signal, and an optical memory device utilizing the optical head. A diffraction device (103) is provided having two chirped grating regions (... | 07/25/1995 |
| 5436882 | Method and device for improving digital audio sound An analog signal which forms part of a digital audio recording system is split into at least two signal paths in one of which it is delayed slightly before being recombined with each signal of the other signal path or paths. The delay can be effected by u... | 07/25/1995 |
| 5434836 | Optical disk, tracking error signal generating apparatus, and tracking control apparatus An optical disk includes: a plurality of recording tracks, each of the recording tracks having a data area for storing data, and a servo control information area for storing servo information; and tracking pits respectively formed on n neighboring recordi... | 07/18/1995 |
| 5434838 | Data recording apparatus and method with verification of optical disc An apparatus for recording data on a post-writing basis onto an a write-once, read-many optical disc of the compact disc standard has a reader unit for reading first image data recorded on a first optical disc, an input unit for receiving second image dat... | 07/18/1995 |
| 5432760 | Method of measuring phase difference of opto-magnetic record medium and apparatus for carrying out said method In order to measure a phase difference of an opto-magnetic disk having a substrate and a magnetic record layer, linearly polarized light is made incident upon the magnetic layer of the disk from the side of the substrate and light reflected by the disk is... | 07/11/1995 |
| 5432768 | Method and device for data management in optical recording medium A recording and reproducing device, which records and reproduces information on and from a rewritable recording medium having absolute addresses and including an information recording area wherein information entered from external devices is recorded and ... | 07/11/1995 |
| 5430703 | Track jump prediction control of memory mode Audio sound data (compressed data) read by an optical pickup is temporarily held in a memory and the audio sound data is expanded to be returned to its original size. At the time of usual reproduction, since the difference in data transfer rates of readin... | 07/04/1995 |
| 5430698 | CD playing apparatus A playing apparatus for a compact disc on which TOC information comprising at least first to third point data has repetitively been recorded in a lead-in area. A reading point by a pickup is moved in the lead-in area from the disc outer rim side in accord... | 07/04/1995 |
| 5430705 | Method and apparatus for recording and reproducing main and sub information In an information recording apparatus, light containing information to be recorded is generated, and a photo-to-electric converting device serves to convert the light into a charge latent image. The photo-to-electric converting device includes a photocond... | 07/04/1995 |
