AUTOMATIC FOCUSING CONTROLLER,申请号JP19890203067-传众专利搜索

AUTOMATIC FOCUSING CONTROLLER

申请公布号：JPH0365910(A)

申请号：JP19890203067

申请日期：1989.08.04

申请公布日期：1991.03.20

申请人：

CANON INC

发明人：KOTO ETSURO

分类号：G03B13/36;G02B7/28;G02B7/34

主分类号：G03B13/36

摘要：PURPOSE:To eliminate the miscalculation of the quantity of lens system driving due to the variation in sensitivity and to enable accurate AF driving by stopping a simultaneous driving means for AF sensor storage processing and lens system driving processing when the extent of variation in the sensitivity of a lens for focusing control is large, and inhibiting the storage of an AF sensor. CONSTITUTION:When a mounted lens has a large sensitivity variation rate, storing operation for a next image signal is not started from the start of lens driving to the end of lens driving by a driving quantity V. A microcomputer 2c monitors lens driving operation by a motor circuit 2e and when the lens is driven by the driving quantity V, a microcomputer 1g is informed of the end of driving through a line 3. Thus, the storage processing of the AF sensor 1a, etc., is started after the driving processing of the lens. Consequently, the accurate driving quantity of the lens is calculated.