Patent ID: 7660053

Claim:
A lens barrel comprising: a lens frame configured to hold a lens and provided to be movable in optical axis directions of the lens; a cam barrel provided and rotated around the outer circumference of the lens frame to move the lens frame in the optical axis directions; a base configured to support the cam barrel to be rotatable and to be immovable in axial directions thereof; and a hollow motor configured to rotate the cam barrel; wherein the hollow motor includes a cylindrical rotor provided around the outer circumference of the cam barrel and connected to the cam barrel to be movable in the axial directions of the cam barrel and to rotate integrally with the cam barrel, and a stator provided to surround the outer circumference of the rotor and supported by the base, wherein the rotor is provided with a first locking portion, wherein the base is provided with a second locking portion which, in accordance with the movement of the rotor in one of the axial directions of the cam barrel, engages with the first locking portion and prevents the rotation of the rotor, and wherein a movement mechanism is provided which moves the rotor in the axial directions of the cam barrel between a locking position at which the first locking portion engages with the second locking portion and an unlocking position at which the first locking portion separates from the second locking portion.