Patent ID: 7113350

Claim:
A lens barrel comprising: a cam ring ( 3 ) that is disposed for rotation about an optical axis; a linked member ( 37 ) that can advance and recede in a direction of the optical axis with rotation of said cam ring about the optical axis; first and second cam grooves ( 3 d , 3 e ) formed in said cam ring for guiding advancement and receding of said linked member in the direction of the optical axis; and first and second cam-followers ( 8 a , 8 b ) that are provided in said linked member and are engageable with said first cam groove and said second cam groove, respectively, wherein said second cam-follower is disengageable from its corresponding second cam groove, a depth of said second cam groove in a position where said second cam-follower is introduced into said second cam groove is deeper than that of said second cam groove at a different position.