发明名称 Automatic focusing device wherein lens movement is controlled in accordance with lens hunting
摘要 An automatic focusing device including a focus detection circuit for detecting a focus state, and a motor for driving a focusing lens in accordance with an output from the focus detection circuit. The device controls the driving state of the motor in accordance with a result of comparing the amplitude of hunting of the focusing lens with a predetermined value when the direction of the drive of the focusing lens is reversed.
申请公布号 US5402175(A) 申请公布日期 1995.03.28
申请号 US19920980965 申请日期 1992.11.24
申请人 CANON KABUSHIKI KAISHA 发明人 TANAKA, TAEKO
分类号 G02B7/28;G03B13/36;H04N5/232;(IPC1-7):H04N5/232 主分类号 G02B7/28
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