| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens barrel with a ultrasonic motor capable of accomplishing both high assemblability and cost reduction without newly adding many parts. SOLUTION: A retainer 2 for a bearing 24 used for an ultrasonic motor is formed so as to be provided with plural notches 2a for storing balls 3, and at least one of the notches 2a is open to one way in the axial direction of the bearing, the other notch 2a is open to the other way in the axial direction, then, the retainer 2 is molded by pulling out two molds in one way, thus, the manufacturing cost is reduced. And also, the balls 3 are held by the retainer 2 after assembling the bearing 24, and simultaneously, the retainer 2 is held by the balls 3, then, the retainer 2 is prevented from falling off in the axial direction. |
