Optical information medium exhibiting sharp threshold for markin

Details Optical information medium exhibiting sharp threshold for markin Optical information medium exhibiting sharp threshold for markin

1990-03-08

1992-08-18

Hess, B. Hamilton

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428913, 428333, 430945, 369288, 346 76L, 3461351, B32B 302

Patent

active

051398370

ABSTRACT:
Provided is an optical information medium comprised of an organic information layer and a resinous continuous film overcoat layer which is coated over said organic information layer. The resinous overcoat layer is no thicker than, and most preferably thinner than said information layer, and is of a thickness of about 100 angstroms or less. It is most preferred that the overcoat layer is comprised of a water soluble polymer. The resulting optical information medium advantageously exhibits an extremely sharp threshold for marking, as well as improved carrier to noise ratio.

REFERENCES:
patent: 3700487 (1972-10-01), Crandon et al.
patent: 4859569 (1989-08-01), Hirose et al.

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