Protective layer for optical information recording medium

Details Protective layer for optical information recording medium Protective layer for optical information recording medium

1987-10-15

1989-07-11

Robinson, Ellis P.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428137, 428688, 428913, 428215, 428216, 428698, 428704, 428323, 428331, 369283, B32B 302

Patent

active

048471321

ABSTRACT:
A protective layer which is applied to rewritable optical information recording medium comprising a substrate and a photosensitive thin film. When exposed to optical energy, the thin layer is capable of undergoing a reversible phase change by which an optical reflectivity is changed between two states. The protective layer is inhibiting the thermal damages of the substrate during light irradiation and also controlling thermal and optical boundary conditions. The protective layer is made of the mixture of mutually solid insoluble materials. The typical choice of the mixture of small crystalline grains of ZnS and noncrystalline SiO.sub.2.

REFERENCES:
patent: 3971874 (1976-07-01), Ohta et al.
patent: 4322839 (1982-03-01), Yamashita et al.
patent: 4405706 (1983-09-01), Takahashi et al.
patent: 4529688 (1985-07-01), Law et al.

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