发明授权
- 专利标题: Liquid crystal indicator in camera finder
- 专利标题(中): 相机取景器中的液晶指示灯
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申请号: US121307申请日: 1980-02-13
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公开(公告)号: US4302086A公开(公告)日: 1981-11-24
- 发明人: Ryoichi Suzuki , Takashi Uchiyama , Hiroyasu Murakami , Masaharu Kawamura , Shinji Sakai , Kikuo Momiyama
- 申请人: Ryoichi Suzuki , Takashi Uchiyama , Hiroyasu Murakami , Masaharu Kawamura , Shinji Sakai , Kikuo Momiyama
- 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: JPX54-19300 19790220
- 主分类号: G09G3/18
- IPC分类号: G09G3/18 ; D21G9/00 ; G01R13/40 ; G02F1/133 ; G03B17/20 ; G09F9/30
摘要:
A liquid crystal cell of elongated shape adapted to be arranged at one side of the field of view of the camera finder has a plurality of opposing of transparent electrodes on opposite sides of a liquid crystal layer which are aligned to each other in a matrix form, whereby the necessary number of leads is reduced. In order for the liquid crystal layer to present an indication in a selected area, or areas, an alternating voltage is applied across the correspondingly aligned electrodes, while still preventing the above-identified alternating voltage to appear at two or more electrodes in one set simultaneously even when light is blocked in the two separated areas of the liquid crystal layer. In other words, the number of those of the plurality of electrodes in set to which the alternating voltage is applied at a time depending upon the exposure value is limited always to only one even when two separated areas are selected for light shuttering at a time. Thus, the exposure values or shutter times can be indicated in half-steps increments.
公开/授权文献
- US6153798A Catalysts for methanol conversion reactions 公开/授权日:2000-11-28
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