Optical recording disk

Details Optical recording disk Optical recording disk

1992-02-25

1993-09-14

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428212, 428457, 428913, 430945, 346 76L, 3461351, B32B 300

Patent

active

052447065

ABSTRACT:
An optical recording disk includes a resin substrate having a recording layer thereon and a protective glass substrate, which are joined into an integral disk such that the recording layer is inside. The resin substrate is formed of a resin composition comprising a specific cyclic polyolefin and an optional alkyl phenol condensate. The resulting lightweight, rigid disk is adapted for recording/reproducing operation at high rotational speeds with few focusing errors due to minimized axial runouts.

REFERENCES:
patent: 4994354 (1991-02-01), Toibana et al.

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