| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens positioning adjustment technique capable of: highly accurately adjusting the position of a lens for a cylindrical body at low cost and with a simple structure; and avoiding a positional deviation after the adjustment.SOLUTION: A lens barrel comprises: a lens frame fitted into a cylindrical body 5 while a lens is held and provided with a plurality of engaging parts 3b; a plurality of adjustment members having cam parts formed with spiral cam surfaces engaging with the engaging parts 3b and rotatably supported by the cylindrical body 5; energization means energizing the lens frame toward an image surface side by pressing the cylindrical body 5 against an object side; and position regulating parts 3i, 3j for regulating the movement of the lens frame in a direction orthogonal to an optical axis direction with respect to the cylindrical body 5. By making the adjustment members rotate, a cam action between the cam surfaces and the engaging parts 3b moves the engaging parts 3b in the optical axis direction to adjust the position of the lens. Then, the lens frame is fixed to the cylindrical body 5. A direction A or B of a force acting in a direction orthogonal to the optical axis direction with respect to the engaging parts 3b, when the adjustment members are rotated, is substantially the same as a direction of a straight line connecting an optical axis center and the position regulating parts 3i, 3j.SELECTED DRAWING: Figure 10 |
