发明授权
- 专利标题: Program shutter
- 专利标题(中): 程式开关
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申请号: US452565申请日: 1989-12-18
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公开(公告)号: US5109250A公开(公告)日: 1992-04-28
- 发明人: Nobuo Shinozaki , Yoichi Seki , Shigeru Tagami
- 申请人: Nobuo Shinozaki , Yoichi Seki , Shigeru Tagami
- 申请人地址: JPX
- 专利权人: Seikosha Co., Ltd.
- 当前专利权人: Seikosha Co., Ltd.
- 当前专利权人地址: JPX
- 优先权: JPX63-163317[U] 19881216
- 主分类号: G03B7/097
- IPC分类号: G03B7/097 ; G03B7/10 ; G03B9/10 ; G03B9/14
摘要:
A program shutter for automatic exposure control including a forwardly/reversibly rotatable step motor for opening and closing a shutter to effect automatic exposure in the control circuit for controlling the operation of the step motor. The control circuit includes stored predetermined shutter mechanism characteristic values. The reversible stepping motor varies the lens aperture in response to a pulsed lens control signal generated by the control circuit. The corresponding value associated with each pulse is varied to be synchronized with and dependent on the shutter mechanism characteristic values and correspondingly varies the rotational power of the reversible stepping motor to overcome detrimental inherent shutter mechanism characteristics and to increase the response efficiency of the shutter.
公开/授权文献
- US5551630A Hot and cold water mixing discharge device 公开/授权日:1996-09-03