| 摘要 |
PROBLEM TO BE SOLVED: To prevent a top from shifting from a guide groove when a shock acts on a lens barrel.SOLUTION: A zoom lens barrel includes a cam barrel 12 and a first group slide barrel 10 capable of moving in an optical axis direction to the cam barrel 12. A long cam groove 20 is formed in the cam barrel 12; a top 18 is erected so as to insert the cam groove 20 into the first group slide barrel 10 and moves along the cam groove 20 when the first group slide barrel 10 moves to the cam barrel 12; and the end of the top 18 on the side opposite to the first group slide barrel 10 has a shift prevention part 30A having a width larger than the minimum width of the cam groove 20.SELECTED DRAWING: Figure 2 |
