发明授权
- 专利标题: Focus detecting device
- 专利标题(中): 对焦检测装置
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申请号: US343975申请日: 1982-01-29
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公开(公告)号: US4456351A公开(公告)日: 1984-06-26
- 发明人: Akira Hiramatsu , Masayoshi Yamamichi
- 申请人: Akira Hiramatsu , Masayoshi Yamamichi
- 申请人地址: JPX Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX56-16211 19810205; JPX56-16219 19810205; JPX56-16220 19810205; JPX56-16415 19810206; JPX56-16416 19810206; JPX56-18222 19810210
- 主分类号: G02B7/36
- IPC分类号: G02B7/36 ; G03B7/08
摘要:
A device which detects the focus condition of an optical system with respect to an object, includes a sensor having at least one sensing surface, the senor providing an electrical indication to associated circuitry corresponding to light which has passed through the optical system. A cleaning mechanism is operatively arranged with respect to the sensing surface of the sensor so as to keep the sensing surface clean, and thereby insure that the overall device operates properly to detect an in-focus condition of the optical system.