Abstract: A lens barrel comprising an electric motor as the drive source for a first rotary element, a manually operated second rotary element, a plurality of rolling elements in contact with the first and second rotary elements, a mechanism for moving an optical system, and a third rotary element for driving the moving mechanism as it rotates by rotation of the plurality of rolling elements.

Abstract: A holding member for holding an optical member is made of plastic material, and provided with at least two fit portions on the inner diameter surface thereof in such a way as to project toward the optical axis and also to determine the holding position of the optical member. The holding member further includes a resilient portion at a position of almost equal distance to both fit portions to hold the optical member by pressing it against the fit portions.

Abstract: A lens moving device having an axially movable or rotatable sleeve fitted in a fixed sleeve, helix-like camming slot and groove formed respectively through the wall of the movable sleeve and in the inner surface of the fixed sleeve, and a guide pin radially extending from a lens cell into a cross point of the slot and groove, whereby the side edges of each of the helix-like camming slot and groove are made tapered surfaces, and the guide pin in the form of a singlet member or a plurality of concentric members is shaped to a truncated cone in contacting portions with the tapered surfaces of the slot and groove.

Abstract: The adjustment of inclination or tilt of a lens cell containing a focusing lens or a lens for zooming with respect to an optical axis is carried out by a cam provided between the cell and a movable sleeve in which the cell is fitted.

Abstract: A lens moving device having a longitudinally elongated guide slot in a sleeve axially movable along with an actuator, and a protuberant lug formed in a body tube and extending into the guide slot, with an engagement member fitted in both a penetration hole provided in the body tube and the guide slot to thereby assure operative connection between the protuberant lug and the slot over the entire range of axial movement of the movable sleeve.

Abstract: A lens mounting mechanism including a fixed tube, a lens holder, a movable sleeve in which the holder is fitted and responsive to operation of an actuator for axially moving the holder, an intermediate sleeve having a guide slot for controlling the movement of the holder in cooperation with the movable sleeve and an adjusting sleeve, the intermediate and adjusting sleeves lying between the fixed tube and the movable sleeve. The adjusting sleeve is rotatable relative to the fixed tube but is restrained from axial movement. By rotating the adjusting sleeve, the axial position of the intermediate sleeve can be finely adjusted.