Patent ID: 7990627

Claim:
A lens device comprising: a moving lens that is fixed to a lens frame having a plurality of protruding portions provided on an outer circumferential portion thereof; a barrel that has a cylindrical shape and includes a moving lens holding portion and a guide groove arrangement portion; and a rotating cylinder that has a cylindrical shape corresponding to the barrel, is supported so as to be rotatable with respect to the barrel, and includes a cam groove arrangement portion and a claw arrangement portion, wherein the moving lens holding portion includes straight-ahead grooves that correspond to the plurality of protruding portions and are provided in parallel to the axial direction so as to pass through the moving lens holding portion from an outer circumferential surface to the inside, the protruding portions are fitted to the straight-ahead grooves from the inside to hold the moving lens such that the moving lens is movable along the axial direction, the guide groove arrangement portion includes a first guide groove that is provided in the circumferential direction and a second guide groove that is provided in the circumferential direction so as to deviate from the first guide groove in the axial direction, the cam groove arrangement portion includes cam grooves, which have a predetermined trajectory and to which the plurality of protruding portions protruding from the outer circumferential surface of the barrel are fitted, provided in the inner circumferential surface thereof, the claw arrangement portion includes a first claw portion fitted to the first guide groove and a second claw portion fitted to the second guide groove, and the first claw portion and the second claw portion are arranged at a predetermined interval in the circumferential direction such that they deviate from each other in the axial direction.