Optical information recording medium, original disc for...

Details Optical information recording medium, original disc for... Optical information recording medium, original disc for...

2007-11-13

2007-11-13

Alanko, Anita (Department: 1765)

Etching a substrate: processes

Forming or treating optical article

C216S067000, C216S075000

Reexamination Certificate

active

10928186

ABSTRACT:
An optical information recording medium, which includes both of a land surface and a groove surface as a recording track and presents high signal quality. The optical information recording medium includes both a land and a groove as the recording track on a substrate, in which a laser light is irradiated from a reverse side of the substrate to thereby carry out a recording and a reproduction, and an inclination angle of a groove side is 25° or more and 40° or less, and both of arithmetic average roughness (Ra) on the land surface and the groove surface are assumed to be 0.2 to 0.7 nm.

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