| 摘要 |
The present invention is directed to a movable body driving mechanism including a first frame and a second frame that is capable of moving relative to the first frame. The movable body driving mechanism includes a cam groove that is formed in the first frame, and a cam follower that is formed in the second frame and inserted movably in the cam groove. The cam groove includes a plurality of regions having different widths. The cam follower is formed to have a shape with a plurality of outer diameters, and different parts of the cam follower contact an inner lateral surface of the cam groove in each of the plurality of regions. With this configuration, the lateral surface of the cam follower can be made to contact the lateral surface of the cam groove constantly, thus achieving the cam driving without looseness. Also, since the biasing means or the like is not needed, it is possible both to simplify the configuration and to reduce the number of manufacturing steps.
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