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| Number | Title | Issue Date |
| 6947359 | Optical disk device for data defect detection and use A disk physical strain correction signal generator outputs a signal obtained by allowing a phase compensation signal to pass a LPF as a disk physical strain correction signal during a normal period. During a defect detection period, it outputs the output signal of t... | 09/20/2005 |
| 6847598 | Servo with digital filter to control gain in a frequency band where open loop characteristic is higher than the phase cross-over frequency and lower than resonance frequency The present invention implements a servo system which can support changes of the higher resonance frequencies of the actuator with a simple configuration at low cost. The servo system comprises a head 3 which at least reads a disk 1, a carriage 5 | 01/25/2005 |
| 6754146 | Error signal detection apparatus for an optical recording/reproduction system An error signal detection apparatus for an optical recording/reproducing system including a light source emitting a light beam and an objective lens focusing the light beam to form a light spot on a recording medium, the apparatus including: a photodetecting unit di... | 06/22/2004 |
| 6738330 | Optical information reproducing and recording apparatus utilizing varying temperature setting ranges A temperature inside the information reproducing and recording apparatus is always monitored and it is judged whether the temperatures is a proper operation start temperature, a stop temperature or a restart temperature or not. Based on this judgement, the start and... | 05/18/2004 |
| 6724706 | Digital adaptive equalizer for different quality signals Hold registers receive a hold register enable signal. When reading one kind signal of header field data, the hold register enable signal is High and the registers store newly renewed values of filter coefficients, and when reading a different kind signal of recordin... | 04/20/2004 |
| 6657931 | Optical disc drive for performing read/write operations on optical disks An optical disc drive compatible with optical discs of different types, for example, is provided. For focusing, through an optical system used in common with the different types of optical discs, a laser beam emitted from a selected one of a plurality of ... | 12/02/2003 |
| 6646962 | Apparatus for detecting dropout, an error signal extracting unit, and unit for identifying type of dropout in an optical pickup A servo control apparatus of an optical pickup is provided for reading recorded information from a recording medium and generates a read signal. The apparatus includes an error signal extracting part for extracting an error signal which indicates a deviat... | 11/11/2003 |
| 6639887 | Optical apparatus with laser light receiver and focus error generator in the same layer An optical integrated apparatus is used in an optical pickup apparatus which irradiates a light emitted by a light emitting device to an optical information record medium, on which record information is recorded, and receives a reflection light reflected ... | 10/28/2003 |
| 6636467 | Method and apparatus for accurately calibrating the timing of a write onto storage media The write-timing calibration involves (1) writing a calibration data sequence referenced to a physical timing clock (such as a wobble clock on a DVD disk), (2) measuring the timing offset or phase offset between the calibration data sequence and the clock... | 10/21/2003 |
| 6633521 | Storage apparatus and servo recovery method of it The present invention relates to a storage device and a servo recovery method for the storage device, which restores the head to a track when the head goes off from the track of a storage medium, and whereby it prevents the servo recovery process from bei... | 10/14/2003 |
| 6631109 | Optical recording method and apparatus, and optical storage medium In an optical recording method and apparatus of the present invention, a driving power is applied to a light source to control emission of a light beam to a recording layer of an optical storage medium, the driving power including a sequence of mark and s... | 10/07/2003 |
| 6625103 | Aspherical objective lens for reading information from optical disks of different thickness and manufacturing method therefor An aspherical objective lens and its manufacturing method are disclosed which allows for forming an optical spot with fewer side lobes on optical discs having a continuous lens plane and substrates different in thickness. The aspherical objective lens is ... | 09/23/2003 |
| 6621771 | Disk drive with an objective lens disposed in an optical head moving along a transfer line not intersecting the center of rotation of a disk A disk drive includes a DVD optical head and a CD optical head. An objective lens in the CD optical head moves along a reference radial line passing through the center of rotation of an optical disk. An objective lens in the DVD optical head moves along a... | 09/16/2003 |
| 6621773 | Glitch protection method in optical storage device A track seeking and track locking method in an optical storage device capable of computing protection intervals such that any state transition of the TEZC signal and the RFZC signal within the computed protection interval is prohibited. The method is also... | 09/16/2003 |
| 6618346 | Optical pickup device having aperture restriction arrangement An optical pickup device has one or a plurality of aperture restriction devices that are disposed in the optical path of a light beam that is emitted from a light source and illuminated onto an optical disk. The aperture restriction device restricts the c... | 09/09/2003 |
| 6606293 | Optical information recording medium and methods for recording, reading, and erasing information thereupon There is disclosed an optical information recording medium having phase-change recording films whose the transmittance can be made substantially uniform irrespective of the presence or absence of recording. There are also disclosed methods for recording, ... | 08/12/2003 |
| 6600708 | Speed control of optical disc player based on duration of a control signal A method for controlling speed of a spindle motor of an optical disc player is provided by the invention. The method provided accept a on-line or real-time control signal asserted by a user and determine whether a property within the control signal meets ... | 07/29/2003 |
| 6598154 | Precoding branch instructions to reduce branch-penalty in pipelined processors A method of reducing the branch penalty in a microprocessor includes predecoding the instruction to determine whether an instruction is a branch, the length of the instruction, and prediction marker information for the instruction should it be a branch. T... | 07/22/2003 |
| 6594205 | Optical scanning device with parallel-controlled actuators An optical scanning device includes a radiation source; an optical lens system with an optical axis for focusing a radiation beam supplied, in operation, by the radiation source into a scanning spot on an information carrier, the lens system including a h... | 07/15/2003 |
| 6594221 | Optical pickup device An optical pickup device includes an illuminating optical system for focusing light beams, split in a main beam and at least one side beam, onto a track on an information storage surface of an optical storage medium to form optical spots thereon. The devi... | 07/15/2003 |
| 6587422 | Disk recording device for overwriting data on a defined recording region For an overwriting operation, recorded data is read from a disk, and a bit clock is reproduced from the read, recorded data in a clock reproduction circuit (7). Data processing in an encoder (14) is performed in synchronism with the reproduced bit clock. ... | 07/01/2003 |
| 6587416 | Disk recording apparatus for controlling interruption of data and securing interleave length of first and last blocks of data after start and release of recording interruption When data recording on a disk is interrupted due to the termination of data reception and recording is then resumed with reception of new data, specific data generated by a data generator (23) is added to the last block of the data received immediately be... | 07/01/2003 |
| 6584058 | Optical storage device and liquid crystal device having separate liquid crystal layers with opposing electrodes There are disclosed an optical storage device for accessing an optical recording medium such as a phase change type of optical disk and an optical magnetic disk, and a liquid crystal device preferably applicable to such a optical storage device. The liqui... | 06/24/2003 |
| 6567353 | Optical head with light receiving element surfaces divided into at least three light receiving areas An optical head is provided with a beam splitting element which divides a beam reflected by a data recording surface of an optical disc into two beams with generating opposite defocus therebetween, and a pair of light receiving elements which receive the ... | 05/20/2003 |
| 6564310 | Data transfer circuit and a recording apparatus and method using a predetermined offset for calculating start A data transfer circuit or a recording apparatus includes an address setting unit for setting a start address for a buffer memory, an offset setting unit for setting an offset for the buffer memory, and an address creating unit for creating a predetermine... | 05/13/2003 |
| 6552987 | Optical disk apparatus wherein recording clock signal is stopped being supplied to semiconductor laser drive circuit on optical pickup during reproduction operation According to the present invention, in an optical disk apparatus constructed to supply signals for controlling a semiconductor laser drive circuit provided to an optical pickup from a signal processing circuit through a flexible cable, the semiconductor l... | 04/22/2003 |
| 6552971 | Disk drive apparatus for a recording medium having plural recording surfaces in a layered structure In order to perform stable focusing jump in accordance with the wobble of a disk, an optical pickup is moved radially inward toward a central area of the disk where the amount of wobble is small. A focusing error signal in accordance with wobble is feed-f... | 04/22/2003 |
| 6552977 | Information reproducing apparatus enabling equalization processing with equalization coefficient for reproduced information An information reproducing apparatus for reproducing information of information marks by scanning information marks recorded on tracks inside a predetermined information recording region by an optical spot, the apparatus includes a driving device, an opti... | 04/22/2003 |
| 6552982 | Information recording medium, information recording and reproduction method, and information recording and reproduction apparatus An information recording medium includes a data recording area for recording data; a first drive information area for recording first drive information; and a second drive information area for recording second drive information. The first drive informatio... | 04/22/2003 |
| 6549495 | Record carrier, playback device and method of recording information A record carrier has substantially parallel tracks, which exhibit first variations of a first physical parameter and second variations of a second physical parameter of the track. The first variations represent information recorded on the record carrier, ... | 04/15/2003 |
| 6545965 | Recording medium having adjacent pit trains in opposite phase, recording apparatus for the same, and reproducing apparatus for the same A recording medium for recording digital information including a substrate member, a plurality of recording tracks formed on the substrate member, and a plurality of pits formed on the recording tracks. In the recording medium, the pits are arranged in a ... | 04/08/2003 |
| 6545971 | Information recording/reproducing system for recording/reproducing information in three-dimensional recording medium of a light passing-through type A recording/reproducing system records/reproduces information in a three-dimensional optical recording medium wherein information is recordable at three-dimensional optional positions and wherein position reference regions having optical characteristics d... | 04/08/2003 |
| 6542452 | Method and system for computing digital sum variation of a stream of channel-bit symbols A digital sum variation (DSV) computation method and system is proposed, which is capable of determining the DSV value of a bit stream of channel-bit symbols to thereby find the optimal merge-bit symbol for insertion between each succeeding pair of the ch... | 04/01/2003 |
| 6539471 | Method and apparatus for pre-processing instructions for a processor Method and apparatus for reducing or eliminating retirement logic in an out-of-order processor are disclosed. Instructions are processed using a processing unit capable of out-of-order processing and having architectural registers having an architectural ... | 03/25/2003 |
| 6523107 | Method and apparatus for providing instruction streams to a processing device A circuit is provided to provide instruction streams to a processing device: embodiments of the circuit are appropriate for use with RISC CPUs, whereas other embodiments are useable with other processing devices, such as small processing devices used in a... | 02/18/2003 |
| 6513108 | Programmable processing engine for efficiently processing transient data A programmable processing engine processes transient data within an intermediate network station of a computer network. The engine comprises an array of processing elements symmetrically arrayed as rows and columns, and embedded between input and output b... | 01/28/2003 |
| 6507546 | 2,2,1 Asymmetric partial response target in a sampled amplitude read channel for disk storage systems A sampled amplitude read channel is disclosed for reading data recorded on a disk storage medium by detecting an estimated data sequence from a sequence of read signal sample values generated by an analog read signal emanating from a read head positioned ... | 01/14/2003 |
| 6504804 | Moving body position detecting method and disc drive apparatus A plurality of periodical signals are generated as the moving body moves. The periodical signals are given respective fundamental values. The fundamental value of one of the periodical signals that has a maximum value is detected sequentially. An extensio... | 01/07/2003 |
| 6501718 | Disk, recording and reproduction apparatus, and recording and reproduction method Transfer of ancillary information, typically related to main information stored on an optical disk, to or from a storage on a disk is performed before the disk is capable of reproducing information. Described is a disk fitting aid member arranged in a rec... | 12/31/2002 |
| 6496922 | Method and apparatus for multiplatform stateless instruction set architecture (ISA) using ISA tags on-the-fly instruction translation A method and apparatus for providing a stateless multiplatform instruction set architecture (ISA) for use in a computer system having a processor and memory storing a control program for implementing the invention. The system is used to statelessly execut... | 12/17/2002 |
