发明名称 |
AUTOMATIC FOCUSING SYSTEM |
摘要 |
PURPOSE:To make the distribution of reflected laser light fluxes and perform automatic focusing highly accurately by using two cylindrical lenses having unidirectional lens effect and so disposing them that the circular cylindrical axes of both intersect perpendicularly in an optical video disc apparatus. |
申请公布号 |
JPS5317705(A) |
申请公布日期 |
1978.02.18 |
申请号 |
JP19760091360 |
申请日期 |
1976.08.02 |
申请人 |
HITACHI LTD |
发明人 |
MIYAUCHI TOSHIMITSU;MAEDA TAKESHI |
分类号 |
G03B13/36;G02B7/28;G11B7/09;G11B7/135 |
主分类号 |
G03B13/36 |
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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