Thin protective overcoat layer for optical video disc

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

1979-10-22

1981-11-10

Hartary, Joseph W.

Recorders

Record receivers and/or driving means therefor

Laminated, impregnated, or coated bases

346 76L, 369284, 430945, 430961, G01D 1534

Patent

active

043001432

ABSTRACT:
An optical recording medium comprises a light reflecting material which is coated with a light absorbing layer and overcoated with a thin, amorphous, coherent layer of an optically transparent and chemically and thermally stable material such as silicon dioxide. During recording, portions of the light absorbing layer are ablated 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 can be wiped or washed off the recording medium without damage to the light absorbing layer.

REFERENCES:
patent: 3342754 (1967-09-01), Gorham
patent: 3665483 (1972-05-01), Becker
patent: 3911444 (1975-10-01), Lou
patent: 3954469 (1976-05-01), Avanzado
patent: 3990084 (1976-11-01), Hamisch
patent: 4023185 (1977-05-01), Bloom
patent: 4032691 (1977-06-01), Kido
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patent: 4038524 (1977-07-01), Puech
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patent: 4097895 (1978-06-01), Spong
patent: 4101907 (1978-07-01), Bell
patent: 4216501 (1980-08-01), Bell
Congleton et al.; A Comparison of Plastic Versus Metal Coatings for Real Time Laser Recording; JAPE, vol. 3, No. 2, Spring 1977 pp. 97-105.
Chemical Abstract, vol. 63, Jul. 1965, No. 794d.

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