Erasable optical data storage medium having an embedded servo tr

Details Erasable optical data storage medium having an embedded servo tr Erasable optical data storage medium having an embedded servo tr

1986-12-19

1989-04-25

Faber, Alan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369284, 369286, 369100, 3461351, G11B 724

Patent

active

048254304

ABSTRACT:
An erasable optical data storage medium has an embedded servo track and a subsurface recording interface. An erasable recording structure having two dyed polymer layers is separated from the servo track by a compression layer. The servo track is formed in a hard substrate which provides mechanical support for the medium. The medium is adapted to form non-vesicular data bumps projecting into the compression layer when exposed to a write laser beam of predetermined wavelength projected through the substrate and compression layer. The embedded servo track and recording interface are sufficiently close to each to be read simultaneously in the same focal plane.

REFERENCES:
patent: 4264986 (1981-04-01), Willis
patent: 4285056 (1981-08-01), Bell
patent: 4336545 (1982-06-01), Howe et al.
patent: 4360895 (1982-11-01), Cornet
patent: 4371954 (1983-02-01), Cornet
patent: 4398203 (1983-08-01), Cornet
patent: 4404656 (1983-09-01), Cornet
patent: 4408213 (1983-10-01), Bell
patent: 4578788 (1986-03-01), Ahn et al.
patent: 4599718 (1986-07-01), Nakagawa et al.
patent: 4719615 (1988-01-01), Feyrer et al.

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