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    • 9. 发明授权
    • Power focus device in a camera
    • 电源对焦设备在相机中
    • US4864344A
    • 1989-09-05
    • US298337
    • 1989-01-17
    • Kazuhiko ArakawaRyuichi Kobayashi
    • Kazuhiko ArakawaRyuichi Kobayashi
    • G02B7/08G03B3/10
    • G03B3/10G02B7/08
    • A power focus device in a camera has a manually rotatively operated focus ring, a lens driving drive source for driving a focusing lens, and a pulse generating device operatively associated with the rotation of the focus ring to generate a pulse signal conforming to the amount of rotation of the focus ring. A focus ring rotation direction detecting device detects the direction of rotation of the focus ring from the pulse signal, a focus ring rotation amount detecting device detects the amount of rotation of the focus ring from the pulse signal, and a drive direction setting device sets the direction of drive of the lens driving drive source on the basis of the result of the detection in the focus ring rotation direction detecting device. A drive amount setting device memorizes the result of the detection in the focus ring rotation amount detecting device and sets the memorized value as the amount of drive of the lens driving drive source. A drive source control device control the lens driving drive source in accordance with the direction of drive set in the drive direction setting device and the amount of drive set in the drive amount setting device. A reversing device immediately reverses the lens driving drive source, changes the setting in the drive direction setting device, returns the drive amount setting device to its initial state, and immediately reverses the lens driving drive source when the focus ring has been rotatively operated in a direction to drive the lens driving drive source in a second direction when the lens driving drive source is being driven in a first direction.
    • 相机中的功率对焦装置具有手动旋转操作的聚焦环,用于驱动聚焦透镜的透镜驱动驱动源和与聚焦环的旋转可操作地相关联的脉冲产生装置,以产生符合 聚焦环的旋转。 聚焦环旋转方向检测装置从脉冲信号检测聚焦环的旋转方向,聚焦环旋转量检测装置根据脉冲信号检测聚焦环的旋转量,驱动方向设定装置 基于聚焦环旋转方向检测装置的检测结果,透镜驱动驱动源的驱动方向。 驱动量设定装置将检测结果存储在聚焦环旋转量检测装置中,并将存储值设定为透镜驱动驱动源的驱动量。 驱动源控制装置根据驱动方向设定装置的驱动方向和设定在驱动量设定装置中的驱动量来控制镜头驱动驱动源。 反转装置立即反转透镜驱动驱动源,改变驱动方向设定装置的设定,将驱动量设定装置返回到其初始状态,并且当聚焦环已经被旋转操作时立即反转透镜驱动驱动源 方向,当透镜驱动驱动源在第一方向上被驱动时,沿第二方向驱动透镜驱动驱动源。