| 摘要 |
PROBLEM TO BE SOLVED: To reduce an optical axis direction length of a cylindrical member constituting an optical lens barrel, and further reduce the optical lens barrel in size.SOLUTION: An optical lens barrel includes: holding members 2 and 4 for holding optical elements 1 and 3; a first cylindrical member 6 on which guide sections for guiding the holding members 2 and 4 in an optical axis direction are formed; and a second cylindrical member 5 that is disposed on an outer periphery of the first cylindrical member 6 and can relatively rotate with the first cylindrical member 6 about an optical axis. On the second cylindrical member 5, cam sections 5a and 5b for moving the holding members 2 and 4 in the optical axis direction are formed. On an outer periphery portion of the second cylindrical member 5, a bayonet engagement section 5c is formed. In a plurality of regions out of a flange portion 6c in a circumferential direction, overhang portions 6d extending in the optical axis direction along an outer peripheral surface of the second cylindrical member 5 and bayonet protrusion portions 6e that extend from the overhang portions 6d to an inside of a radial direction and engage with the bayonet engagement section 5c of the second cylindrical member 5 are provided while a flange portion 6c extending outside the radial direction of the first cylindrical member 6 is being formed on an outer periphery portion of the first cylindrical member 6. |
