Patent ID: 8400723
Filing Date: 2013-03-19
Classification: G02B

Abstract:
1. A lens barrel having an eccentricity adjusting mechanism, the lens barrel comprising: a lens frame that holds a lens for an optical system of the lens barrel; a pressing ring that is screw-connected to a fixed barrel of the lens barrel, a part of the lens frame is disposed between the pressing ring and the fixed barrel so that the lens frame is supported to be rotatable around the optical axis; an engaging part that is formed on an outer circumferential face of the lens frame and protrudes from the outer circumferential face of the lens frame; a tool insertion hole that penetrates from an outside of the fixed barrel of the lens barrel to the position of the engaging part in the diameter direction, and into which a tool is inserted to be engaged with a side face of a circumferential direction side of the engaging part so that the lens frame is rotated around the optical axis and eccentricity adjustment for lenses held in the lens frame is carried out; an engaging face that is a side face of the circumferential direction side of the engaging part, is formed in the rotation direction to loosen the pressing ring screw-connected to the fixed barrel, and is engageable with the tool to rotate the lens frame in a rotation direction to tighten the pressing ring; and a non-engaging face that is a side face of the circumferential direction side of the engaging part, is formed in the rotation direction to tighten the pressing ring screw-connected to the fixed barrel, and is not engageable with the tool to prevent the lens frame from rotating in the rotation direction to loosen the pressing ring.