发明名称 |
Optical data recording/reproduction apparatus for use with semiconductor lasers as a light source |
摘要 |
An optical data recording and reproduction apparatus which uses a semiconductor laser as a light source is disclosed. The half angle of light issuing from the laser in a junction direction of the laser and the focal length of a condenser lens adapted to focus a laser beam from the laser are adequately selected in such a manner as to satisfy a particular condition.
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申请公布号 |
US5337302(A) |
申请公布日期 |
1994.08.09 |
申请号 |
US19930093974 |
申请日期 |
1993.07.13 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
GOTOH, HIROSHI;EMOTO, MASAMI;YOKOMORI, KIYOSHI |
分类号 |
G11B7/135;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/135 |
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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