Optical recording disk

Details Optical recording disk Optical recording disk

1991-12-10

1993-05-25

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

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

Patent

active

052138623

ABSTRACT:
An optical recording disk is constructed using an injection molded substrate of a cyclic polyolefin having a recurring structural unit of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are independently selected from hydrocarbon groups. The disk has a diameter of at least 200 mm, and is rotated at 1,800 rpm or higher during recording/reproducing operation. Despite a larger diameter, the disk experiences minimized occurrence of double refraction during high speed rotation, ensuring high outputs with a high C/N and a low noise level.

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