发明名称 |
FOCUS DETECTING APPARATUS UTILIZING REFLECTING SURFACE HAVING VARIABLE REFLECTIVITY OR TRANSMISSIVITY |
摘要 |
A light beam emitted from a source is focused on an object. The beam reflected by the object passes through an optical member and is detected by a photodetector. The optical member has a reflecting surface the reflectivity of which varies continuously with respect to the angle of incidence. |
申请公布号 |
CA1300750(C) |
申请公布日期 |
1992.05.12 |
申请号 |
CA19880560367 |
申请日期 |
1988.03.02 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
TADOKORO, MICHIHIRO;OKADA, KAZUO;IMAI, HITOSHI |
分类号 |
G02B7/28;G11B7/09 |
主分类号 |
G02B7/28 |
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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