Processing

Please wait...

Settings

Settings

1. WO1996006427 - MULTI-LAYER INFORMATION STORAGE SYSTEM

Publication Number WO/1996/006427
Publication Date 29.02.1996
International Application No. PCT/IB1995/000648
International Filing Date 16.08.1995
Chapter 2 Demand Filed 22.03.1996
IPC
G11B 7/005 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
004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
005Reproducing
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 7/13 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
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
13Optical detectors therefor
G11B 7/135 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
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
G11B 7/24 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
24Record carriers characterised by shape, structure or physical properties, or by the selection of the material 
G11B 7/00 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
CPC
G11B 2007/0013
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;
0003Recording, reproducing or erasing systems characterised by the structure or type of the carrier
0009for carriers having data stored in three dimensions, e.g. volume storage
0013for carriers having multiple discrete layers
G11B 7/005
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;
004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
005Reproducing
G11B 7/08511
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
08511with focus pull-in only
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 7/13
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
Applicants
  • PHILIPS ELECTRONICS N.V. [NL/NL]; Groenewoudseweg 1 NL-5621 BA Eindhoven, NL
  • PHILIPS NORDEN AB [SE/SE]; Kottbygatan 5 Kista S-164 85 Stockholm, SE (SE)
Inventors
  • COOPS, Peter; NL
  • HEEMSKERK, Jacobus, Petrus, Josephus; NL
  • VISSER, Derk; NL
  • HOLTSLAG, Antonius, Hendricus, Maria; NL
Agents
  • VISSER, Derk; Internationaal Octrooibureau B.V. P.O. Box 220 NL-5600 AE Eindhoven, NL
Priority Data
08/299,86101.09.1994US
94202416.723.08.1994EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MULTI-LAYER INFORMATION STORAGE SYSTEM
(FR) SYSTEME MULTICOUCHE DE STOCKAGE D'INFORMATION
Abstract
(EN)
An information storage system is described comprising an optical multi-layer record carrier (1) and a device (10) for scanning the layers (3, 4, 5) with a scanning spot (15) formed by a radiation beam (12). The radiation beam is compensated for spherical aberration for a single height of the scanning spot within the stack (2) of layers. The height of the stack is determined by the maximum spherical aberration admissible for the system. The number of layers in the stack is determined by the minimum distance between layers, which depends on the crosstalk on servo errorsignals due to currently unscanned layers.
(FR)
Système de stockage d'information comprenant un support d'enregistrement optique multicouche (1) et un dispositif (10) servant à explorer les couches (3, 4, 5) qui utilise un point lumineux d'analyse (15) formé par un faisceau (12) de rayonnement. L'aberration sphérique du faisceau de rayonnement est compensé pour une seule hauteur du point lumineux d'analyse dans la pile (2) de couches. La hauteur de la pile est déterminée par l'aberration sphérique maximum que peut supporter le système. Le nombre de couches de la pile est déterminé par la distance minimum entre les couches qui dépend de la diaphonie des signaux d'erreur d'asservi résultant des couches qui ne sont pas encore explorées.
Latest bibliographic data on file with the International Bureau