LENS BARREL, AND IMAGE PICKUP APPARATUS HAVING THE SAME

摘要

A lens barrel which is capable of accurately performing positioning of lenses and preventing a mounted external barrel unit from coming off unexpectedly. The lens barrel comprises a fixed cam ring having a rotation regulating cam groove disposed on an inner circumferential surface thereof, the cam groove opening to an object side end part thereof in an optical axis direction of the lens barrel, a movable cam ring received in the fixed cam ring, and an external barrel unit having, on an outer circumferential surface thereof, a rotation regulating section engaged with the rotation regulating cam groove. The external barrel unit is received in the fixed cam ring and outwardly fitted on the movable cam ring. The rotation regulating cam groove has a movement-regulating section, configured to regulate movement of the rotation regulating section in the optical axis direction, at an object side end part thereof in the optical axis direction.

主权项

1. A lens barrel comprising:
a fixed cam ring having a rotation regulating cam groove disposed on an inner circumferential surface thereof, the cam groove opening to an object side end part thereof in an optical axis direction of the lens barrel; a movable cam ring received in the fixed cam ring; and an external barrel unit having, on an outer circumferential surface thereof, a rotation regulating section engaged with the rotation regulating cam groove, the external barrel unit being received in the fixed cam ring and outwardly fitted on the movable cam ring, wherein the rotation regulating cam groove has a movement-regulating section, configured to regulate movement of the rotation regulating section in the optical axis direction, at an object side end part thereof in the optical axis direction.