发明名称 FOCUS DETECTION DEVICE
摘要 PURPOSE:To speed up focus detection by deciding a focus detection result as to a range finding point and selecting the range finding point without waiting for a focus detection result at another range finding point when the focus detec tion as to one range finding point ends. CONSTITUTION:A lens control circuit 2 makes a serial communication through a DBUS while receiving an LCOM signal from a microcomputer 1 and controls a motor according to the communication contents to control a distance ring and a stop. Further, the microcomputer 1 receives focal length information on a lens, distance information, best focus correction information, other various correction information, etc. When focus detecting operation is performed at plural range finding points, it is decided whether or not the focus detection result at the range finding point whose focus detecting operation ends first matches the range finding point without waiting for the focus detection results of other range finding points; when it is decided that the decision result matches the range finding point, lens driving based upon the focus result of the range finding point is performed.
申请公布号 JPH0545576(A) 申请公布日期 1993.02.23
申请号 JP19910209481 申请日期 1991.08.21
申请人 CANON INC 发明人 AOYAMA KEISUKE
分类号 G02B7/28;G02B7/34;G03B13/36 主分类号 G02B7/28
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