| 摘要 |
PURPOSE:To make the center of a lens barrel and the optical axis of a lens coincident with each other independently of the clearance of fitting to the lens by constituting a fitting part of the lens barrel with a center adjusting mechanism having a partial sphere of a ball which has the center point on the optical axis of the barrel and a required diameter. CONSTITUTION:A lens barrel 10 is provided with a cylinder part 11 and a cylinder part 12 whose diameter is larger than that of the cylinder part 11. A screw part 14 for threaded engagement of a press ring 13 is provided on the inside wall surface of the cylinder part 12, and the press ring 13 threadedly engaged with this screw part 14 has an inside diameter part 13a whose diameter is larger than the outside diameter of a lens body 16 of a lens 15 to be held. A screw part 13b threadedly engaged with the screw part 14 is formed on the outside circumference of the press ring 13, and thus, this ring 13 is constituted with a one ring body. The lens 15 to be held is constituted with one circular body provided with a holding edge 17 along the outside circumference of the lens body 16. |
