| Patent Number |
Title Of Patent |
Date Issued |
| 6563774 |
Drive apparatus for optical recording medium capable of reducing resonance |
May 13, 2003 |
| An apparatus for carrying out a fine servo control and a rough servo control with respect to the rotation of a motor for rotating a recording medium in accordance with information recorded on the recording medium. A fine servo signal is generated on the basis of a reproduction clock, |
| 6256273 |
Focusing control apparatus for optimally directing light onto a recording surface |
July 3, 2001 |
| A focusing control apparatus is designed to perform a focus jumping operation successfully. The apparatus has reading device which irradiates read light to a recording medium 1 having information recording surfaces formed on at least two layers, respectively, receiving return light of th |
| 6246646 |
Focus control apparatus for multilayer optical recording medium |
June 12, 2001 |
| A focus control apparatus for a multilayer optical recording medium performs an adequate focus jump on a multilayer optical recording medium. Threshold values are set according to the amount of a level change in a focus error signal of a loaded multilayer optical recording medium, and |
| 6147942 |
Focus control apparatus for multilayer optical recording medium |
November 14, 2000 |
| A focus control apparatus for a multilayer optical recording medium which performs an appropriate focus jump on a multilayer optical recording medium. This focus control apparatus implements such focus jump control as to temporarily release a focus servo on one layer of a loaded multilay |
| 6134196 |
Carriage controller for multi-layer disc |
October 17, 2000 |
| A carriage controller for a multi-layer disc which is capable of performing a stable carriage control during reproduction of a multi-layer disc of the opposite recording scheme. A tracking error signal is relayed by an equalizer, and a carriage motor is driven in accordance with an outpu |
| 5886963 |
Gain control device for servo control |
March 23, 1999 |
| An automatic gain control device includes: reading unit for reading information signal from a recording medium; servo loop including servo control unit for controlling position of the reading unit with respect to the recording medium; mixing unit for mixing a disturbance signal into the |
| 5761164 |
Gain control device for servo control |
June 2, 1998 |
| An automatic gain control device includes: reading unit for reading information signal from a recording medium; servo loop including servo control unit for controlling position of the reading unit with respect to the recording medium; mixing unit for mixing a disturbance signal into the |
| 5508988 |
Method and apparatus for reproducing information from a partially recorded recording medium |
April 16, 1996 |
| Method and Apparatus for playing a CD are designed to allow playback of a partially recorded disk of CD-Rs (CD-Recordable) having the DRAW (direct read after write) capability. It is determined if a target disk is a partially recorded CD-R recording medium. When a reverse command to retu |
| 5471441 |
CD player capable of playing back partially recorded CD |
November 28, 1995 |
| A CD player capable of detecting the recording end of a partially recorded CD-R (PRD) during playback. When an unrecorded area (URA) is detected, an address immediately before that of the URA is held and a setup is performed at the position of that detection. If the setup is unsuccessful |
| 5430698 |
CD playing apparatus |
July 4, 1995 |
| 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 accordance with a TOC information readi |
| 5414684 |
Method and apparatus for discriminating type of disks positioned on a CD player |
May 9, 1995 |
| Disclosed is a CD player that ensures a setup operation and reproduction of information even when a partially recorded CD-R is set therein. The CD player sequentially performs the setup operation, starting from the first setup position located at the innermost periphery of the CD, predet |
| 4939712 |
Multiple track and reversing address search method for use in a disk player system |
July 3, 1990 |
| Address search method for use in a disk player repeatedly performing a track jump operation for jumping over a plurality of recording tracks at one time. The present method changes to a jump state from a locking state in which a tracking servo system of the disk player is locked so that |
