Information recording medium

Details Information recording medium Information recording medium

1989-12-28

1992-09-15

Hess, Bruce H.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 76, 428212, 428913, 369272, 369283, B32B 302

Patent

active

051477017

ABSTRACT:
In an optical information recording medium, a protective layer containing a material not reacting with an active layer is disposed, and the composition ratio of this protective layer is designed so as to increase the amount of the material not reacting with the active layer near the border contacting with the active layer, so that degradation of the active layer is prevented. In this construction, the stability is maintained after repetition of recording and erasing cycles over 1 million times.

REFERENCES:
patent: 4461807 (1984-07-01), Mori et al.
patent: 4786538 (1988-11-01), Saito et al.
patent: 4847132 (1989-07-01), Takao et al.

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