| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens barrel constituted so that the relative moving quantity between frame members with reference to a rotating angle can be inflected without reducing the strength. SOLUTION: A 1st group driving groove 20 provided with a 1st helicoid groove 21 and two projections of 2nd helicoid grooves 22 and 23 which are formed of grooves different from the 1st helicoid groove 21 and adjoin the 1st helicoid groove 21 is arranged in a cam frame 5, and also, an engagement part 24 which can be successively engaged with the groove 21 and the groove 22 and an engagement part 25 which can be engaged with the groove 21 and the groove 23 are arranged on a 1st group lens frame 6, and the 1st group lens frame 6 is connected and supported by the cam frame 5 by freely slidably engaging two engagement parts 24 and 25 with the 1st group driving groove 20. Then, the lead between the cam frame 5 and the 1st group lens is inflected without reducing the strength of the cam frame 5 and the connection strength between the cam frame 5 and the 1st group lens frame 6.
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