| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens driving device for driving a frame member to advance/retreat, whose sliding resistance is made small and which realizes miniaturization. SOLUTION: The camera 1 incorporates the lens driving device and a lens frame unit 7 having a photographic optical system and a CCD, and the lens driving device is provided to drive a 2nd group frame 72 holding a 2nd group lens so as to advance/retreat and has a half nut 82 having a female screw thread part and turnably supported by a sleeve 81 for the guide shaft of the 2nd group frame 72, and a nut pawl 83 having a female screw thread part and turnably supported by the half nut. The half nut 82 and the nut pawl 83 are held on and screwed in the outside diameter part of a feed screw shaft 103. Since the half nut 82 and the nut pawl 83 are turnably supported, unnatural force does not act on the screwed part even when positional deviation between the guide shafts 75 and 76 and the feed screw shaft 103 is caused, and the frame 72 is smoothly driven to advance/retreat. COPYRIGHT: (C)2005,JPO&NCIPI
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