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    • 5. 发明授权
    • Automatic focus control device for use in a camera system
    • 用于相机系统的自动对焦控制装置
    • US4969006A
    • 1990-11-06
    • US386029
    • 1989-07-25
    • Kenji IshibashiMasataka HamadaTokuji IshidaNobuyuki TaniguchiHiroshi Ootsuka
    • Kenji IshibashiMasataka HamadaTokuji IshidaNobuyuki TaniguchiHiroshi Ootsuka
    • G02B7/34G03B13/36
    • G02B7/34
    • There is provided an automatic focus control device for use in a camera system comprising a focus detection control means for continuously driving a motor from the time when it is judged that a focus condition of a photograph lens can not be detected until it is judged that the focus condition can be detected, and a rotation number control means for controlling the rotation speed of said motor driven by said focus detection control means in accordance with a constant data designating a relationship between the rotation number of said motor and a unit of a defocus value. Accordingly, the moving speed of said photograph lens is controlled in accordance with defocus variation during the movement of said photograph lens, resulting in that the infocus position of the object can be detected by a low contrast search without overrunning the infocus position, even though the object is positioned far from an available range of the focus detection.
    • 提供了一种用于照相机系统中的自动对焦控制装置,包括焦点检测控制装置,用于从判断为无法检测到照相镜的焦点状态的时刻连续地驱动电动机,直到判断为 可以检测焦点条件;以及旋转数控制装置,用于根据指定所述电动机的转数与散焦值单位之间的关系的恒定数据来控制由所述焦点检测控制装置驱动的所述电动机的转速 。 因此,根据在所述照相镜的移动期间的散焦变化来控制所述照相镜的移动速度,导致可以通过低对比度搜索来检测物体的聚焦位置而不超越聚焦位置,即使 物体远离焦点检测的可用范围。