Optical information recording medium utilizing pits having a sha

Details Optical information recording medium utilizing pits having a sha Optical information recording medium utilizing pits having a sha

1987-07-09

1990-01-23

Faber, Alan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369109, 369111, G11B 724

Patent

active

048963135

ABSTRACT:
An optical information recording medium having a sharp front face of an optical information recording pit to thereby reduce jitter of a reproduced optical signal. The front and back end portions of a pit are made to have a sharp edge and a wider portion. In a cutting operation for an original medium used for mass production of medium, the light exposure amount to a photoresist on the original medium is controlled to increase it at the front and back edge portions of a pit.

REFERENCES:
patent: 4037251 (1977-07-01), Bricot et al.
patent: 4152726 (1979-05-01), Kojima et al.
patent: 4646103 (1987-02-01), Sugiyama et al.
patent: 4787075 (1988-11-01), Matsuoka et al.

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