发明名称 |
Focus detecting device |
摘要 |
The disclosed device prevents degradation of distance measurement accuracy due to alignment error in the mounting of a detachable lens barrel on a camera body. The lens barrel houses a focusing objective lens and a first distance measurement position is set along the optical path of the objective lens within the lens barrel. A second distance measuring position is set within the camera body. A light projector is positioned at one of the distance measuring positions and projects a measuring beam, and a photo detector is positioned at the other of the distance measuring positions to receive a reflection beam from the object being measured to produce a signal to be used for focus adjustment.
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申请公布号 |
US4723142(A) |
申请公布日期 |
1988.02.02 |
申请号 |
US19860926808 |
申请日期 |
1986.10.30 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
MOMIYAMA, KIKUO;FUJIBAYASHI, KAZUO;OHTAKA, KEIJI |
分类号 |
B65D1/02;G02B7/32;G03B3/00;(IPC1-7):G03B3/00 |
主分类号 |
B65D1/02 |
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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