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1. WO2003041066 - LIGHT INTEGRATION UNIT, OPTICAL PICKUP DEVICE USING THE UNIT, AND OPTICAL DISK DEVICE

Publication Number WO/2003/041066
Publication Date 15.05.2003
International Application No. PCT/JP2002/011538
International Filing Date 05.11.2002
IPC
G11B 7/1353 2012.1
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
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
1353Diffractive elements, e.g. holograms or gratings
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 7/0901
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
G11B 7/094
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
094Methods and circuits for servo offset compensation
G11B 7/123
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
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
123Integrated head arrangements, e.g. with source and detectors mounted on the same substrate
G11B 7/131
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
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
13Optical detectors therefor
131Arrangement of detectors in a multiple array
G11B 7/1353
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
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
1353Diffractive elements, e.g. holograms or gratings
Applicants
  • SHARP KABUSHIKI KAISHA [JP]/[JP] (AllExceptUS)
  • SAKAI, Keiji [JP]/[JP] (UsOnly)
  • MIYAKE, Takahiro [JP]/[JP] (UsOnly)
  • UEYAMA, Tetsuo [JP]/[JP] (UsOnly)
  • MIKI, Renzaburo [JP]/[JP] (UsOnly)
  • HIRAJIMA, Hiroshige [JP]/[JP] (UsOnly)
  • FUJITA, Noboru [JP]/[JP] (UsOnly)
  • MIYAZAKI, Osamu [JP]/[JP] (UsOnly)
Inventors
  • SAKAI, Keiji
  • MIYAKE, Takahiro
  • UEYAMA, Tetsuo
  • MIKI, Renzaburo
  • HIRAJIMA, Hiroshige
  • FUJITA, Noboru
  • MIYAZAKI, Osamu
Agents
  • HARA, Kenzo
Priority Data
2001-34507209.11.2001JP
2002-11592218.04.2002JP
2002-24847928.08.2002JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) LIGHT INTEGRATION UNIT, OPTICAL PICKUP DEVICE USING THE UNIT, AND OPTICAL DISK DEVICE
(FR) UNITE D'INTEGRATION DE LUMIERE, DISPOSITIF DE CAPTEUR OPTIQUE UTILISANT CETTE UNITE ET DISPOSITIF DE DISQUE OPTIQUE
Abstract
(EN) A light integration unit capable of providing a stable tracking servo performance by preventing an offset from being produced by the shifting of an objective lens and the inclination of a disk when a one−beam tracking method eliminating a reduction in quantity of light of a main beam is used, wherein a diffraction grating is disposed between a hologram and a light receiving part and the diffraction efficiency thereof is differentiated in the longitudinal direction of the grating, for example, when the ray of light incident on the diffraction grating is shifted as an offset in the longitudinal direction of the grating, the quantity of receiving light varies in light receiving areas, and a tracking servo is performed so as to cancel the change, whereby the offset can be compensated, and the stable tracking servo performance can be provided.
(FR) L'invention concerne une unité d'intégration de lumière permettant de fournir une performance de servomécanisme de guidage stable par entrave à la production d'une déviation par déplacement d'un objectif et à l'inclinaison d'un disque lorsqu'un procédé de guidage par un seul faisceau éliminant une réduction en quantité de lumière d'un faisceau principal est utilisé. Un réseau de diffraction est disposé entre un hologramme et une partie recevant la lumière, l'efficacité de diffraction de celui-ci étant différenciée dans la direction longitudinale du réseau, par exemple, lorsque le rayon de lumière incident sur le réseau de diffraction est déplacé comme une déviation dans la direction longitudinale du réseau, la quantité de lumière reçue variant selon les zones de réception de lumière, et un servomécanisme de guidage est mis en oeuvre de manière à éliminer le changement, la déviation pouvant ainsi être compensée, et la performance du servomécanisme de guidage stable, fournie.
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