Patent ID: 7324291

Claim:
A lens barrel in which a zooming in a photographing region and a retraction to a non-photographing region are carried out, the lens barrel comprising: (a) a stationary barrel having a cam groove on an inner circumferential surface thereof; (b) a cam barrel having a cam pin which is engaged with the cam groove of the stationary barrel, provided on an outer circumferential surface thereof and a cam groove provided on an inner circumferential surface thereof, and being supported rotatably to the stationary barrel and movably along an optical axis; and (c) a lens retainer having a cam pin which is engaged with the cam groove provided on the inner circumferential surface of the cam barrel, wherein a first cam groove to be used at least in a part of the photographing region and a second cam groove to be used at least in a part of the non-photographing region are formed on the inner circumferential surface of the stationary barrel, and a first cam pin to be engaged with the first cam groove and a second cam pin to be engaged with the second cam groove are formed on the outer circumferential surface of the cam barrel.