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1. WO2008018581 - OPTICAL DISC CONTROL DEVICE

Publication Number WO/2008/018581
Publication Date 14.02.2008
International Application No. PCT/JP2007/065695
International Filing Date 10.08.2007
IPC
G11B 7/095 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
08Disposition or mounting of heads or light sources relatively to record carriers
09with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
095specially adapted for discs, e.g. for compensation of eccentricity or wobble
CPC
G11B 7/08505
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; Record carriers therefor
08Disposition or mounting of heads or light sources relatively to record carriers
085with provision for moving the light beam into, or out of, its operative position ; or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
08505Methods for track change, selection or preliminary positioning by moving the head
G11B 7/0945
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; Record carriers therefor
08Disposition or mounting of heads or light sources relatively to record carriers
09with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
0945Methods for initialising servos, start-up sequences
G11B 7/0953
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; Record carriers therefor
08Disposition or mounting of heads or light sources relatively to record carriers
09with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
095specially adapted for discs, e.g. for compensation of eccentricity or wobble
0953to compensate for eccentricity of the disc or disc tracks
G11B 7/0956
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; Record carriers therefor
08Disposition or mounting of heads or light sources relatively to record carriers
09with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
095specially adapted for discs, e.g. for compensation of eccentricity or wobble
0956to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
Applicants
  • パナソニック株式会社 PANASONIC CORPORATION [JP]/[JP] (AllExceptUS)
  • 安河内 真弓 YASUKOUCHI, Mayumi (UsOnly)
Inventors
  • 安河内 真弓 YASUKOUCHI, Mayumi
Agents
  • 早瀬 憲一 HAYASE, Kenichi
Priority Data
2006-21903810.08.2006JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) OPTICAL DISC CONTROL DEVICE
(FR) DISPOSITIF DE COMMANDE DE DISQUE OPTIQUE
(JA) 光ディスク制御装置
Abstract
(EN)
Provided is an optical disc control device capable of stable repetition control during jump operation, retrial, or long seek without degrading the target value following performance. The optical disc control device includes: an adder to which a signal to be compensated having a cyclic frequency component read from an optical disc is inputted; a filter unit for outputting a signal contained in the learning band set arbitrarily in the output signals of the adder; a memory for successively updating and storing output signals of the filter unit; a gain element for multiplying the signal information outputted from the memory by a gain of 0 to 1 and inputting it to the adder; a rotation speed detection unit for detecting the rotation speed of the optical disc; a disc position detection unit for detecting the position on the optical disc; a circumferential direction shift amount calculation unit for calculating the shift amount of the pickup in the circumferential direction on the optical disc; and a memory control unit for controlling an address for reading the signal information from the memory according to the circumferential direction shift amount calculated by the circumferential direction shift amount calculation unit.
(FR)
L'invention concerne un dispositif de commande de disque optique capable d'une commande de répétition stable au cours d'une opération de saut, d'essai répété, ou d'une longue recherche sans dégrader les performances suivantes de la valeur cible. Le dispositif de commande de disque optique comprend : un additionneur dans lequel est entré un signal à compenser ayant une composante de fréquence cyclique lue à partir d'un disque optique ; une unité de filtrage pour délivrer en sortie un signal contenu dans la bande d'apprentissage fixée arbitrairement dans les signaux de sortie de l'additionneur ; une mémoire pour mettre à jour et mémoriser successivement les signaux de sortie de l'unité de filtrage ; un élément à gain pour multiplier les informations de signal délivrées en sortie par la mémoire, par un gain compris entre 0 et 1 et les entrer dans l'additionneur ; une unité de détection de la vitesse de rotation pour détecter la vitesse de rotation du disque optique ; une unité de détection de position du disque pour détecter la position sur le disque optique ; une unité de calcul du décalage dans la direction circonférentielle pour calculer le décalage de captation dans la direction circonférentielle sur le disque optique ; et une unité de commande de mémoire pour commander une adresse pour lire les informations de signal à partir de la mémoire selon le décalage de direction circonférentielle calculé par l'unité de calcul du décalage dans la direction circonférentielle.
(JA)
 ジャンプ動作時、リトライ時やロングシーク時において、目標値の追従性能を損なわない、安定した繰返し制御を行うことができる光ディスク制御装置を提供する。  光ディスクより読み出される周期的な周波数成分を持つ被補償信号が入力される加算器と、前記加算器の出力信号のうち、任意に設定される学習の帯域に含まれる信号を出力するフィルタ部と、前記フィルタ部の出力信号を順次更新記憶するメモリと、前記メモリより出力される信号情報に、0以上1以下のゲインを乗じて前記加算器に入力するゲイン要素と、光ディスクの回転速度を検出する回転速度検出部と、光ディスク上の位置を検出するディスク位置検出部と、光ディスク上のピックアップの円周方向の移動量を算出する円周方向移動量算出部と、前記円周方向移動量算出部が算出した円周方向移動量に基づいて、前記メモリの前記信号情報を読み出すためのアドレスを制御するメモリ制御部とを備えるものとした。
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