发明授权
- 专利标题: Focus indicating device for camera
- 专利标题(中): 相机对焦指示装置
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申请号: US123313申请日: 1980-02-21
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公开(公告)号: US4300826A公开(公告)日: 1981-11-17
- 发明人: Harumi Aoki , Katsuhiko Miyata , Koji Suzuki
- 申请人: Harumi Aoki , Katsuhiko Miyata , Koji Suzuki
- 申请人地址: JPX Tokyo
- 专利权人: Asahi Kogaku Kogyo Kabushiki Kaisha
- 当前专利权人: Asahi Kogaku Kogyo Kabushiki Kaisha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX54-26500 19790307
- 主分类号: G03B13/36
- IPC分类号: G03B13/36 ; G02B7/36 ; G03B17/18 ; G03B17/20 ; G03B13/18
摘要:
A focus position indicating device for a camera including an array of electrically activatable display elements such as light emitting diodes or liquid crystal elements, the number of which are activated being dependent upon the state of focusing. A drive contrast signal is converted into a digital signal and compared with the count output of a continuously-cycling digital counter. The output of the counter is also decoded into a set of signals one of which is activated for each possible state of the counter output. The decoder output signals are gated by the output of a comparator circuit with the outputs of the gates connected to drive the display elements.
公开/授权文献
- US6071883A Flavone analogues useful as anti-rejection agents 公开/授权日:2000-06-06
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