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1. WO1991000596 - OPTICAL DISK DEVICE

Publication Number WO/1991/000596
Publication Date 10.01.1991
International Application No. PCT/JP1990/000843
International Filing Date 28.06.1990
IPC
G11B 7/09 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
G11B 7/12 2012.01
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
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
G11B 7/13 2012.01
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
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
13Optical detectors therefor
G11B 7/135 2012.01
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
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
CPC
G11B 7/0917
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
0917Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
G11B 7/124
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
124the integrated head arrangements including waveguides
G11B 7/13
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
G11B 7/1365
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
1365Separate or integrated refractive elements, e.g. wave plates
G11B 7/1381
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
1381Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
G11B 7/1384
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
1384Fibre optics
Applicants
  • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. [JP/JP]; 1006, Oaza Kadoma Kadoma-shi Osaka 571, JP (AllExceptUS)
  • NISHIWAKI, Seiji [JP/JP]; JP (UsOnly)
  • UCHIDA, Shinji [JP/JP]; JP (UsOnly)
  • ASADA, Junichi [JP/JP]; JP (UsOnly)
Inventors
  • NISHIWAKI, Seiji; JP
  • UCHIDA, Shinji; JP
  • ASADA, Junichi; JP
Agents
  • AWANO, Shigetaka ; Matsushita Electric Industrial Co., Ltd. 1006 Oaza Kadoma, Kadoma-shi Osaka 571, JP
Priority Data
1/17012330.06.1989JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) OPTICAL DISK DEVICE
(FR) DISPOSITIF A DISQUE OPTIQUE
Abstract
(EN)
An optical disk device which satisfies a relationship (As cos øs - 1)» - Ds(As2 - 2As cos øs + 1)2/4$g(l)2 or As cos øs = 1 , wherein As denotes the ratio of the amplitude reflectivity of signal marks (27), (28) on the signal surface (16) of optical disk to that of regions outside the signal marks, øs denotes a phase difference, Ds denotes the area of the signal marks (27), (28), and $g(l) denotes a wavelength of a source of light (8). The light reflected by the signal surface (16) is input to waveguide layers (3A), (3B) through grating couplers (4A), (4B) to obtain guided beams (18A), (18B) which are emitted from the ends of the waveguide layers (3A), (3B) and are received by the light detectors (6A), (6B) to obtain control signals and reproduced signals.
(FR)
Un dispositif à disque optique satisfait la relation (As cos øs - 1)» - Ds(As2 - 2As cos øs + 1)2/4$g(l)2 ou As cos øs = 1, dans laquelle As indique le rapport entre le pouvoir réfléchissant de marques (27, 28) gravées sur la surface de signaux (16) du disque optique et le pouvoir réfléchissant des régions dépourvues de marques, ø indique une différence de phase, Ds indique la superficie des marques (27, 28) et $g(l) indique une longueur d'onde d'une source de lumière (8). La lumière réfléchie par la surface de signaux (16) est transmise à des couches guides d'ondes (3A, 3B) à travers des grilles de couplage (4A, 4B) afin de produire des faisceaux guidés (18A, 18B) qui sont émis par les extrémités des couches guides d'ondes (3A, 3B) et reçus par les photodétecteurs (6A, 6B) afin de générer des signaux de commande et des signaux de reproduction.
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