| 摘要 |
A lens unit has an opening to incorporate first and second movable lens frames at a side other than an image side and an object side. The first movable lens frame has a first through hole to slide on a first guide shaft and a second through hole to slide on a second guide shaft. The second movable lens frame has a first through hole and a second through hole one of which slides on a third guide shaft. The length of the first through hole of the first movable lens frame is longer than that of the second through of the first movable lens frame and the length of the first through hole of the second movable lens frame is longer than that of the second through hole portion of the second movable lens frame.
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