| 摘要 |
PURPOSE:To prevent a distance ring from rotating to a position which has passed through the initial position by inertia by placing a detaining claw working in the direction opposite to a ratchet by the same number of pieces as a lens barrel feeding cam, on the outside periphery of the distance ring, and engaging them at a position of the distance ring in case it is reset to the initial position. CONSTITUTION:In order to reset a lens barrel 2 to the initial position, the electric conduction of the forward direction is executed to a rotor 19 again, and a distance ring 1 is turned clockwise by a lens barrel driving operation. In the last feed action in which the lens barrel 2 gets over one of distance cams 1a of the distance ring 1, as for the distance ring 1, a load for feeding the lens barrel 2 is gone suddenly when the lens barrel 2 has got over. It further rotation by inertia is prevented because a detaining claw 1c of the distance ring 1 contacts by abutting on a claw part 9b of a feed lever 9, and the distance ring 1 stops exactly at the initial position. |
