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    • 81. 发明授权
    • Exposure control device for camera of variable focal length type
    • 可变焦距型摄像机曝光控制装置
    • US4777508A
    • 1988-10-11
    • US931809
    • 1986-11-18
    • Chikara Aoshima
    • Chikara Aoshima
    • G03B7/083G03B7/20G03B3/00G03B7/099
    • G03B7/083G03B7/20
    • There is disclosed an exposure control device for a camera having a photographic lens of variable focal length type which includes exposure control means for controlling an exposure on the basis of a light coming from an object to be photographed and passing through an optical path different from that of the photographic lens and correcting means for correcting said exposure control means to correct the exposure depending upon a change of an open F-number of the photographic lens caused by a variation of the focal length, by changing a resistance value of a variable resistor or a length of the optical path for measuring the light in response to the variation of the focal length of said photographic lens.
    • 公开了一种具有可变焦距类型的摄影镜头的照相机的曝光控制装置,该曝光控制装置包括曝光控制装置,该曝光控制装置用于根据来自被拍摄对象的光并通过与该拍摄对象不同的光路来控制曝光 以及校正装置,用于校正所述曝光控制装置,以通过改变可变电阻器的电阻值,根据由焦距的变化引起的摄影透镜的打开F数的变化来校正曝光,或者 用于响应于所述摄影镜头的焦距的变化来测量光的光路的长度。