Thick protective overcoat layer for optical video disc

Details Thick protective overcoat layer for optical video disc Thick protective overcoat layer for optical video disc

1977-08-29

1982-02-09

Miller, Jr., George H.

Recorders

Record receivers and/or driving means therefor

Laminated, impregnated, or coated bases

346 76L, G01D 1534

Patent

active

043152694

ABSTRACT:
An optical recording medium comprises a light reflecting material which is coated with a light absorbing layer and overcoated with a 0.05-1 millimeter thick layer of an optically transparent and chemically and thermally stable material such as a silicone resin. During recording, portions of the light absorbing layer are ablated or melted by a modulated focussed light beam, thereby exposing portions of the reflecting layer while leaving the overcoat layer intact. Information is recorded in the form of a reflective-antireflective pattern. Dust particles and other surface contaminants settle on the upper surface of the overcoat layer, so far removed from the focal plane of the recording lens that their effect on the recording or playback signal is considerably reduced, and no defect is noticeable on the playback monitor.

REFERENCES:
patent: 3560994 (1971-02-01), Wolff et al.
patent: 3665483 (1972-05-01), Becker et al.
patent: 3740761 (1973-06-01), Fechter
patent: 3889272 (1975-06-01), Lou et al.
patent: 3911444 (1975-10-01), Lou et al.
patent: 3971874 (1976-07-01), Ohta et al.
patent: 4000492 (1976-12-01), Willens
patent: 4023185 (1977-05-01), Bloom et al.
patent: 4069487 (1978-01-01), Kasai et al.

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