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    • 44. 发明授权
    • Camera having a zoom lens unit
    • 相机具有变焦镜头单元
    • US4935763A
    • 1990-06-19
    • US372237
    • 1989-06-26
    • Masatoshi ItohHidenori FukuokaKazuhiko Kojima
    • Masatoshi ItohHidenori FukuokaKazuhiko Kojima
    • G02B7/28H04N5/225H04N5/232
    • H04N5/23212G02B7/282H04N5/2254
    • When a variator lens is driven to effect zooming, focal length information of a zoom lens unit, a zooming direction and a defocus amount are detector. Integration in CCD for focus detection is regulated in a short time during zooming and a cycle of focus detection is set to a predetermined period. A moving speed of a compensator lens is controlled based on detected information. A moving range of the variator lens is divided into zones and a basic moving speed of the compensator lens is set for each zone. When the variator lens is driven and information obtained by focus detection or a zooming condition corresponds to a specified condition, the compensator lens is moved at a basic speed corresponding to the zone where the variator lens exists or at a moving speed of the compensator lens applied till then. Focus detection areas automatically changed dependent on a situation of an object are forbidden to be changed during zooming. In addition, a focus detection are indicating mark displayed in a finder of the camera is fixed and unchanged during zooming irrespective of actual change of the focus detection area.
    • 当变倍透镜被驱动以实现变焦时,变焦镜头单元的焦距信息,变焦方向和散焦量是检测器。 用于焦点检测的CCD中的积分在缩放期间在短时间内被调节,并且将焦点检测的周期设置为预定时段。 基于检测到的信息来控制补偿透镜的移动速度。 变倍透镜的移动范围分为区域,并为每个区域设置补偿透镜的基本移动速度。 当变倍透镜被驱动并且通过焦点检测或变焦条件获得的信息对应于指定条件时,补偿透镜以对应于变倍透镜存在的区域或应用补偿透镜的移动速度的基本速度移动 直到那时。 根据物体的情况自动变化的焦点检测区域在缩放期间被禁止更改。 此外,焦点检测是指在相机的取景器中显示的标记在变焦期间是固定的和不变的,而与焦点检测区域的实际变化无关。