| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized lens barrel in which a lens group is smoothly moved and the focus position is stabilized and whose durability is high. SOLUTION: First and second bearings 6-1 and 6-2 are made to abut on both side surfaces of a cam groove 7a by a pressing member 8, to eliminate a backlash at the cam groove 7a so that the position of a rear group lens L2 is stabilized. Also, first and second outer ring regulating parts 4a-1, 4a-2, 5a-1 and 5a-2 to regulate first and second outer rings 6b-1 and 6b-2 are provided so that a stable operation is assured even though a caught amount between the first and second bearings 6-1 and 6-2 and the cam groove 7a is small, thereby obtaining high durability in this lens barrel.
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