Optical recording medium

Details Optical recording medium Optical recording medium

1992-01-29

1993-06-01

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 4284111, 428457, 428913, 430945, 346 76L, 3467351, B32B 300

Patent

active

052157989

ABSTRACT:
Optical recording media include substrates of a larger diameter formed by injection molding a copolymer of ethylene with a cyclic olefin. The media are adapted for high speed rotation with the benefits of a high output, high C/N, and low noise level. When a protective substrate of glass is attached to the polyolefin substrate such that the recording layer is inside, there is obtained a light-weight rigid disk which experiences minimal axial runouts and hence, minimal focusing errors during high rotational speed operation.

REFERENCES:
patent: 4944967 (1990-07-01), Yabe et al.
patent: 4994354 (1991-02-01), Tiobana et al.

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