Processing

Please wait...

Settings

Settings

1. WO1996004650 - DUAL LAYER OPTICAL MEDIUM HAVING PARTIALLY REFLECTING THIN FILM LAYER

Publication Number WO/1996/004650
Publication Date 15.02.1996
International Application No. PCT/US1995/007096
International Filing Date 05.06.1995
Chapter 2 Demand Filed 05.03.1996
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 7/24 2013.01
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 7/258 2013.01
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 
241Record carriers characterised by the selection of the material
252of layers other than recording layers
258of reflective layers
CPC
G11B 7/24
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;
24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/252
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;
24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
241characterised by the selection of the material
252of layers other than recording layers
G11B 7/2534
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;
24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
241characterised by the selection of the material
252of layers other than recording layers
253of substrates
2533comprising resins
2534polycarbonates [PC]
G11B 7/2548
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;
24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
241characterised by the selection of the material
252of layers other than recording layers
254of protective topcoat layers
2548consisting essentially of inorganic materials
G11B 7/258
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;
24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
241characterised by the selection of the material
252of layers other than recording layers
258of reflective layers
G11B 7/2585
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;
24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
241characterised by the selection of the material
252of layers other than recording layers
258of reflective layers
2585based on aluminium
Applicants
  • MINNESOTA MINING AND MANUFACTURING COMPANY [US/US]; 3M Center P.O. Box 33427 Saint Paul, MN 55133-3427, US
Inventors
  • HINTZ, Michael, B.; US
Agents
  • LEVINSON, Eric, D. ; Minnesota Mining and Manufacturing Company Office of Intellectual Property Counsel P.O. Box 33427 Saint Paul, MN 55133-3427, US
  • VOSSIUS & PARTNER; Patentanwalte P.O. Box 86 07 67 D-81634 München, DE
Priority Data
08/286,28905.08.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DUAL LAYER OPTICAL MEDIUM HAVING PARTIALLY REFLECTING THIN FILM LAYER
(FR) SUPPORT OPTIQUE A DOUBLE COUCHE COMPORTANT UNE COUCHE MINCE PARTIELLEMENT REFLECHISSANTE
Abstract
(EN)
A dual layer pre-recorded optical disc (12) includes a transparent substrate (14), a partially reflective layer (16), a transparent spacer layer (18), and a highly reflective layer (20). One pattern of data pits (15) is provided on the substrate, adjacent the partially reflective layer, and another pattern of data pits (19) is provided on the spacer layer, adjacent the highly reflective layer. The partially reflective layer may be made of silicon carbide. A substrate-incident beam can be used to read data encoded in either data pit pattern depending on which layer the laser (30) is focused upon. The dual layer disc has twice the data storage capacity of conventional single layer discs.
(FR)
Disque optique (12) préenregistré à double couche comportant un sbstrat transparent (14), une couche partiellement réfléchissante (16), une couche d'espacement transparente (18) et une couche à haut pouvoir réfléchissant (20). Un motif de microcuvettes de données (15) est ménagé sur le substrat de manière contiguë à la couche partiellement réfléchissante, tandis qu'un autre motif de microcuvettes de données (19) est ménagé sur la couche d'espacement, de manière contiguë à la couche à haut pouvoir réfléchissant. La couche partiellement réfléchissante peut être constituée de carbure de silicium. Un faisceau incident sur le substrat peut être utilisé pour lire les données codées dans chacun des motifs de microcuvette de données, en fonction de la couche sur laquelle le laser (30) est focalisé. Ce disque à couche double présente une capacité de stockage de données double par rapport aux disques ordinaires à simple couche.
Latest bibliographic data on file with the International Bureau