发明名称 Lens drive control apparatus for zoom lens system having a switching lens group
摘要 A lens drive control apparatus for a camera having a zoom lens provided with variable lens groups, at least one of the variable lens groups including a switching lens group having two sub lens groups, wherein one of the two sub lens groups serves as a movable sub lens group. The lens drive control apparatus includes a main drive device for moving the plurality of variable lens groups; and a sub lens group drive device for moving the movable sub lens group within the switching lens group to be positioned at a movement extremity on the object side or the image side, with respect to the other sub lens group, in accordance with a zooming zone from the short focal length extremity to an intermediate focal length position, or a zooming zone from the intermediate focal length to the long focal length extremity.
申请公布号 US6871017(B2) 申请公布日期 2005.03.22
申请号 US20010961186 申请日期 2001.09.24
申请人 PENTAX CORPORATION 发明人 NUMAKO NORIO
分类号 G03B17/00;(IPC1-7):G03B17/00;G02B15/14 主分类号 G03B17/00
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