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1. WO2004105002 - METHOD FOR RADIAL TRACKING IN AN OPTICAL DISC DRIVE

Publication Number WO/2004/105002
Publication Date 02.12.2004
International Application No. PCT/IB2004/050683
International Filing Date 13.05.2004
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
CPC
G11B 7/09
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
G11B 7/0906
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
0906Differential phase difference systems
Applicants
  • KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL]/[NL] (AllExceptUS)
  • STALLINGA, Sjoerd [NL]/[NL] (UsOnly)
Inventors
  • STALLINGA, Sjoerd
Agents
  • UITTENBOGAARD, Frank
Priority Data
03101446.721.05.2003EP
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) METHOD FOR RADIAL TRACKING IN AN OPTICAL DISC DRIVE
(FR) PROCEDE D'ASSERVISSEMENT RADIAL DANS UN LECTEUR DE DISQUE OPTIQUE
Abstract
(EN) A method for radial tracking in an optical disc drive (1) is described. A DTD tracking error signal (S3) is derived from the wobble-induced signal components (WA, WB,WC, WD) of the optical detector signal (SR). This tracking error signal is relatively insensitive to beamlanding errors, and to differences in the signal amplitudes K of the output signal of individual detector segments. Further, the need for a 3-spot grating is eliminated. A distinction is made between on the one hand a situation where the track being followed is empty and on the other hand a situation where the track being followed is written. In case the track being followed is empty, a DTD tracking error signal is derived from the wobble-induced signal components of the optical detector signal, whereas, in case the track being followed is written, a DTD tracking error signal is derived from the data­induced signal components of the optical detector signal.
(FR) L'invention concerne un procédé d'asservissement radial dans un lecteur de disque optique (1). Un signal d'erreur d'asservissement DTD (S3) est dérivé des composantes, induites par la vobulation (WA, WB, WC, WD), du signal du détecteur optique (SR). Ce signal d'erreur d'asservissement est relativement insensible aux erreurs d'incidence du faisceau, et aux différences des amplitudes K du signal de sortie des segments individuels du détecteur. D'autre part, un réseau 3 points n'est plus nécessaire. On opère une distinction entre d'une part une situation où la piste en cours de poursuite est vide, et d'autre part une situation où la piste en cours de poursuite est écrite. Dans le cas où la piste en cours de poursuite est vide, un signal d'erreur d'asservissement DTD est dérivé des composantes, induites par la vobulation, du signal du détecteur optique, tandis que, dans le cas où la piste en cours de poursuite est écrite, un signal d'erreur d'asservissement DTD est dérivé des composantes, induites par les données, du signal du détecteur optique.
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