Information recording medium and method of optically recording i

Details Information recording medium and method of optically recording i Information recording medium and method of optically recording i

1989-01-17

1990-06-05

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428913, 430945, 346 76L, 346 351, 369272, 369277, B32B 302

Patent

active

049313363

ABSTRACT:
An information recording medium comprises a disc-shaped substrate provided with a concave groove of spiral form on the surface and a recording layer for optically recording and reproducing information by means of a laser beam which is provided on the substrate, and both corner portions and top portions of both side walls facing each other in the concave groove are radiused. The information recording medium may further compries an intermediate layer between the substrate and the recording layer. A method of optically recording information using the information recording medium is also disclosed.

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