Combination optical data medium with multiple data surfaces and

Details Combination optical data medium with multiple data surfaces and Combination optical data medium with multiple data surfaces and

1991-01-03

1992-07-28

Levy, Stuart S.

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Having layered storage medium

369112, 369283, G11B 374, G11B 720, G11B 700, G11B 370

Patent

active

051346044

ABSTRACT:
An optical data medium is disclosed from which information recorded to the surface is reproduced by focusing a laser thereon and reading the light reflected from the data surface. The medium includes a first transparent layer having a top data surface for carrying data, and a second transparent layer having a bottom data surface for carrying data. A semi-transparent layer is inserted between the first and second transparent layers. When the laser is focused on the top data surface, the data carried therein is reproduced, and when the laser is focused on the bottom data surface, the data carried therein is reproduced.

REFERENCES:
patent: 3999009 (1976-12-01), Bouwhuis
patent: 4441179 (1984-04-01), Slaten
patent: 4450553 (1984-05-01), Holster et al.
patent: 4542495 (1985-09-01), Ziegler et al.
patent: 4569038 (1986-02-01), Nakashima et al.
patent: 4724533 (1988-02-01), Ohara et al.
patent: 4858050 (1989-08-01), Ashe et al.

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