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    • 2. 发明授权
    • Automatic focusing system
    • 自动对焦系统
    • US4920420A
    • 1990-04-24
    • US269699
    • 1988-11-10
    • Kenji SanoTakesuke MaruyamaHironobu SatohMasaharu DeguchiToshio Murakami
    • Kenji SanoTakesuke MaruyamaHironobu SatohMasaharu DeguchiToshio Murakami
    • H04N5/232
    • H04N5/23212
    • There is provided an automatic focusing system which is used in a video camera or the like. A master lens is finely vibrated and moved by using a moving mechanism consisting of a stepping motor and a lead screw. A speed control circuit to set a moving speed of the master lens is provided. The moving speed of the master lens is set by an output signal of the speed control circuit and the master lens is moved by the moving mechanism. The moving speed of the master lens is optimally controlled and the out-of-step phenomenon in the stepping motor is eliminated. Since the master lens is accurately moved, the focusing operation is executed at a high accuracy. In addition, the influence by the unnecessary vibration (ringing) which is caused by the sudden change in moving speed of the master lens is eliminated. Therefore, since the master lens normally performs a predetermined micro vibration, the correct focusing can be accurately discriminated. Further, when a change in amount of the high frequency component of a video signal is large, since the moving speed of the master lens increases, the operating time until the correct focus is obtained is reduced.
    • 提供了一种用于摄像机等的自动对焦系统。 通过使用由步进电机和导螺杆组成的移动机构,将主镜片精细振动并移动。 提供用于设定主镜头的移动速度的速度控制电路。 主镜头的移动速度由速度控制电路的输出信号设定,主镜头由移动机构移动。 主镜头的移动速度被最佳地控制,并且消除了步进电机中的失步现象。 由于主镜头被精确地移动,所以以高精度执行聚焦操作。 此外,消除了由主镜片的移动速度的突然变化引起的不必要的振动(振铃)的影响。 因此,由于主镜头通常执行预定的微振动,因此可以准确地识别正确的聚焦。 此外,当视频信号的高频分量的变化量大时,由于主镜头的移动速度增加,所以获得正确对焦之前的操作时间被减少。