Optical drive apparatus for use with a multilayer optical data s

Details Optical drive apparatus for use with a multilayer optical data s Optical drive apparatus for use with a multilayer optical data s

1996-09-16

1998-08-18

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, 369 94, G11B 700

Patent

active

057966885

ABSTRACT:
An optical drive apparatus for use with a multilayer optical data storage device, includes: at least two spaced apart storage layers, each of such layers being adapted to store information; a spacer layer positioned between alternating storage layers; at least one of the storage layers including tracking and/or format information, while another storage layer does not include tracking and/or format information; and writing apparatus including a plurality of radiation beams arranged such that at least one beam is focused on a layer with tracking and/or format information and provides tracking and/or format information to at least one other beam that is focused on a layer to be written that does not have substantial tracking and/or format information.

REFERENCES:
patent: 5168486 (1992-12-01), Yamagawa
patent: 5408453 (1995-04-01), Holtslag et al.
K.A. Rubin, et al., SPIE vol. 2338, p. 247, 1994.
"Plain Talk: Dual-Layer Compact Disc", 3M CD-ROM Services, St. Paul, Minn (1995).

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