| 摘要 |
PROBLEM TO BE SOLVED: To make a fixed focus type lens barrel thin. SOLUTION: The guide part 171 of a rear moving frame 17 holding a lens rear group is arranged between two guide parts 142 and 143 arranged at a front moving frame 14 holding a lens front group. Then, a guide shaft 7a is inserted in the guide holes 142a, 143a and 171a of the guide parts 142, 143 and 171. Besides, a compression spring 18 is arranged between the guide parts 142 and 171. Then, the frames 14 and 17 are moved in an optical axis direction together and the spring 18 is more compressed at a collapsibly mounting time [in a figure 3 (B)].
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