发明名称 Film counter
摘要 An electrical film counter for a photographic camera is provided with a differentiating circuit responsive to a film winding operation for producing an output pulse. The number of output pulses from the differentiating circuit is counted by an UP-DOWN counter and is decoded by a decoder designed to drive an indicator which indicates the number of film frames advanced through the film gate of the camera.
申请公布号 US4021828(A) 申请公布日期 1977.05.03
申请号 US19750546562 申请日期 1975.02.03
申请人 CANON KABUSHIKI KAISHA 发明人 IURA, YUKIO;YAMAMICHI, MASAYOSHI;UCHIYAMA, TAKASHI;TAGUCHI, TETSUYA;MASHIMO, YUKIO
分类号 G03B17/36;(IPC1-7):G03B17/36 主分类号 G03B17/36
代理机构 代理人
主权项
地址