发明名称 |
Optical information recording medium utilizing pits having a sharp front face and method of manufacturing the same |
摘要 |
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.
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申请公布号 |
US4896313(A) |
申请公布日期 |
1990.01.23 |
申请号 |
US19870071349 |
申请日期 |
1987.07.09 |
申请人 |
HITACHI MAXELL, LTD. |
发明人 |
HIROSE, ATSUKI;IIDA, TAMOTU |
分类号 |
G11B7/013;G11B7/24;G11B7/26 |
主分类号 |
G11B7/013 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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