Optical data storage media with spatially variable energy absorp

Details Optical data storage media with spatially variable energy absorp Optical data storage media with spatially variable energy absorp

1988-02-05

1989-07-25

Stephan, Steven L.

Dynamic information storage or retrieval

Storage medium structure

Layered

3461351, 369286, 430945, G11B 724

Patent

active

048520772

ABSTRACT:
Optical data storage media of various technologies, including those with multiple layers of varying absorptivities of light as well as those which are grooved to facilitate tracking, are improved by combining the absorptivity differences with height variations in the interface between the layers (and thereby the relative thicknesses of the layers). The result is a means of varying in a spatial manner in the media themselves the rate at which such media absorb energy. This offers a variety of benefits in both recordation and reading, including helping to focus the heat generated by incident recording beams, increasing tracking sensitivity for both recordation and reading, and preformatting the media as a guide for both recordation and reading.

REFERENCES:
patent: 4430659 (1984-02-01), Maffitt et al.
patent: 4527173 (1985-07-01), Gupta et al.
patent: 4578788 (1986-03-01), Ahn et al.
patent: 4651172 (1987-03-01), Watanabe et al.
patent: 4709363 (1987-11-01), Dirks et al.
patent: 4719615 (1988-01-01), Feyrer et al.
J. S. Hartman et al., Erasable Bilayer Dye-Polymer Optical Recording Medium, pp. 155-158.
S. Miyaoka, Digital Audio is Compact and Rugged, IEEE Spectrum, Mar. 1984, pp. 35-39.

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