| 摘要 |
PROBLEM TO BE SOLVED: To improve alignment accuracy of an optical member.SOLUTION: A lens barrel includes: an optical member; a first cylindrical member that has a cam pin protruding in a radial direction and is arranged coaxially with an optical axis of the optical member; and a second cylindrical member that has a cam groove engaging with the cam pin and is arranged coaxially with the first cylindrical member. When the first cylindrical member is relatively rotated around the optical axis to the second cylindrical member, the lens barrel drives the optical member in a direction in parallel with the optical axis, and the cam pin is formed so as to cave in from an annular face at which at least a part of the cam pin comes into contact with the cam groove and has a groove extending in a circumferential direction of the annular surface. |
