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    • 3. 发明授权
    • Video camera with autofocus function and method of controlling the same
    • 具有自动对焦功能的摄像机及其控制方法
    • US5486860A
    • 1996-01-23
    • US417440
    • 1995-04-06
    • Junji ShiokawaHiroshi ChibaToshio MurakamiYoshihiro TodakaIchiro OhsakaTakashi Azumi
    • Junji ShiokawaHiroshi ChibaToshio MurakamiYoshihiro TodakaIchiro OhsakaTakashi Azumi
    • G02B7/08G02B7/10G02B7/28G02B7/36H04N5/232
    • H04N5/23212G02B7/102
    • A video camera has a memory for storing the position of an image lens in relation to the position of a variator lens, that is, zoom tracing curves in respect of individual subject distances, a motor for moving the image lens while vibrating it slightly during zooming operation, a variation component extractor circuit for extracting the amplitude and phase of a slight variation component of focusing voltage generated by moving the image lens while vibrating it slightly, and a controller for controlling drive means on the basis of the stored zoom tracing curves and an extracted slight variation component. During zooming operation, the controller first controls the motor in compliance with a position of the variator lens pursuant to a zoom tracing curve stored in the memory in association with a position assumed by the image lens immediately before start of the zooming operation. The controller also operates to correct a drive amount of the image lens on the basis of amplitude of an extracted slight variation component and when the amplitude of the slight variation component falls below a predetermined value, the controller controls the motor pursuant to a newly determined zoom tracing curve.
    • 摄像机具有用于存储相对于变倍透镜的位置的图像透镜的位置的存储器,即关于各个被摄体距离的变焦跟踪曲线,用于在变焦期间稍微振动的同时使图像透镜振动的电动机 操作,变化分量提取器电路,用于提取通过在使图像透镜稍微振动的同时移动图像透镜而产生的聚焦电压的轻微变化分量的幅度和相位;以及控制器,用于基于存储的变焦跟踪曲线控制驱动装置,以及控制器 提取轻微变异成分。 在变焦操作期间,控制器首先根据存储在存储器中的变焦跟踪曲线与变倍镜头的位置一致地控制电动机,与紧接开始变焦操作之前由图像透镜假定的位置相关联。 控制器还可以基于所提取的轻微变化分量的振幅来校正图像透镜的驱动量,并且当微小变化分量的幅度下降到预定值以下时,控制器根据新确定的变焦来控制电动机 跟踪曲线。