Patent ID: 6751032
Filing Date: 2004-06-15
Classification: G02B

Abstract:
A lens barrel comprising:a cam ring which is rotated about an optical axis to move at least one lens group in the optical axis direction via at least one first cam groove formed on an inner peripheral surface of said cam ring; and a rotational ring which transfers a rotational motion to said cam ring; wherein said rotational ring includes at least one rotation-transmission arm extending in said optical axis direction; wherein said cam ring comprises at least one bottomed engaging recess which is formed on an outer peripheral surface of said cam ring, and in which said rotation-transmission arm is slidably inserted to be movable in said optical axis direction; wherein one and the other of said rotation-transmission arm and said engaging recess comprise a guide groove which extends parallel to said optical axis and a guide projection which is engaged in said guide groove, said rotational ring transferring rotational motion thereof to said cam ring via engagement of said guide groove with said guide projection.