Patent ID: 7936985
Filing Date: 2011-05-03
Classification: G02B

Abstract:
1. A lens barrel that is movable in an optical axis direction, comprising: a lens unit configured to be movable in the optical axis direction while holding a lens, said lens unit comprising a follower portion and a first rectilinear motion-causing restriction portion; a cylindrical unit having a cam portion for causing said follower portion of said lens unit to follow said cam portion, said cylindrical unit being configured to perform rotation to thereby move said lens unit in the optical axis direction; a rectilinear motion-causing restriction member configured to restrict motion of said lens unit to the optical axis direction; a second cylindrical unit bayonet-coupled to said cylindrical unit, said second cylindrical unit having its rotation around the optical axis restricted so as not to rotate around the optical axis even if said cylindrical unit bayonet-coupled thereto rotates around the optical axis, wherein said second cylindrical unit has a second rectilinear motion-causing restriction portion, wherein when said lens unit rotates around the optical axis, said first rectilinear motion-causing restriction portion of said lens unit and said second rectilinear motion-causing restriction portion are shifted from a non-contact state thereof to a contact state thereof.