Abstract: A lens mechanism includes a lens holding member that holds a lens, a movement member that is connected to the lens holding member, a fixation member that supports the movement member to be movable in an optical axis direction, a sensor that detects a position of the movement member, and an adjustment mechanism of the lens holding member. The sensor and the adjustment mechanism are disposed on an inside of the fixation member.

Abstract: A lens device includes a lens mechanism, a movement mechanism that includes a movement member moving the lens mechanism, and a braking mechanism that generates a braking force with respect to movement of the movement member. The braking mechanism includes a braking member that includes a pressing surface pressing a pressing target surface of the movement member, a support member that supports the braking member, and a pressing member that includes a pressing portion applying a pressing force to a first surface of the braking member. A contact portion between the pressing portion and the first surface is formed at a periphery of a recess portion.

Abstract: A lens mechanism includes a lens holding member that holds a lens, a movement member that is connected to the lens holding member and that moves in an optical axis direction, and a guide shaft that guides movement of the movement member. The movement member includes a bearing portion into which the guide shaft is inserted. The bearing portion includes a first portion and a second portion. The first portion comes into contact with the guide shaft. The guide shaft is movably inserted into the second portion.

Abstract: A lens device includes a fixation portion fixed to a lens mechanism and a rotational movement portion that is connected to the fixation portion to be rotationally movable. One of the fixation portion and the rotational movement portion includes a detection member and the other of the fixation portion and the rotational movement portion includes a detection target member and a substrate. The detection target member includes a body portion including an indicator of rotational movement and a plurality of extending portions extending from the body portion. The plurality of extending portions are connected to the substrate.

Abstract: An actuator which drives a lens frame in an optical axis direction is constructed by piezoelectric elements, driving members, and a pressing spring. The piezoelectric elements are placed at opposite sides with a driven plate therebetween, and the driving members are fixed to the respective piezoelectric elements. The driving members are pressed against the driven plate from both sides by the pressing spring.

Abstract: An actuator which drives a lens frame in an optical axis direction is constructed by piezoelectric elements, driving members, and a pressing spring. The piezoelectric elements are placed at opposite sides with a driven plate therebetween, and the driving members are fixed to the respective piezoelectric elements. The driving members are pressed against the driven plate from both sides by the pressing spring.