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1. WO2002005271 - METHOD FOR IMPROVED READING OF A DIGITAL DATA DISC

Publication Number WO/2002/005271
Publication Date 17.01.2002
International Application No. PCT/DK2001/000485
International Filing Date 11.07.2001
Chapter 2 Demand Filed 04.02.2002
IPC
G11B 7/09 2006.1
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
G11B 7/095 2006.1
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 7/0903
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
0901for track following only
0903Multi-beam tracking systems
G11B 7/0909
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
0908for focusing only
0909by astigmatic methods
G11B 7/0946
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
0946specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration
G11B 7/0948
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
0948specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
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
Applicants
  • DISCCONTROL APS [DK]/[DK] (AllExceptUS)
  • ANDERSEN, Palle [DK]/[DK] (UsOnly)
  • PEDERSEN, Tom, Søndergaard [DK]/[DK] (UsOnly)
  • STOUSTRUP, Jakob [DK]/[DK] (UsOnly)
  • VIDAL SANCHEZ, Enrique [ES]/[DK] (UsOnly)
Inventors
  • ANDERSEN, Palle
  • PEDERSEN, Tom, Søndergaard
  • STOUSTRUP, Jakob
  • VIDAL SANCHEZ, Enrique
Agents
  • PATRADE A/S
Priority Data
PA 2000 0108012.07.2000DK
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) METHOD FOR IMPROVED READING OF A DIGITAL DATA DISC
(FR) PROCEDE DE LECTURE AMELIOREE D'UN DISQUE DE DONNEES NUMERIQUES
Abstract
(EN) Method for regulating the control signal for adjustment of the optical path between a data disc and a signal pick-up detector system in a data disc drive, where the control signal is regulated as a response to the deviation of the actual reading signals from expected reading signals, and wherein the control signal is regulated in dependence of the tendency of said deviation.
(FR) La présente invention concerne un procédé qui permet de réguler le signal de commande afin d'ajuster le trajet optique entre un disque de données et un système de détecteur de captation du signal dans un lecteur de disque de données, ledit signal de commande étant régulé en réponse à la déviation des signaux de lecture véritables par rapport aux signaux de lecture attendus, la régulation étant effectuée en fonction de la tendance à ladite déviation.
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