| 摘要 |
PROBLEM TO BE SOLVED: To achieve highly accurate light quantity adjustment excellent in coincidence and followability of a diaphragm diameter to an index of a diaphragm in a lens device configured so that a light quantity adjustment operation member and a variable diaphragm cross an optical element which is movable in an optical axis direction.SOLUTION: The lens device includes: a fixed cylinder; a first operation part to be rotated on the outside of the fixed cylinder; a moving lens barrel arranged on the inside of the fixed cylinder and allowed to be moved in an optical axis direction while holding an optical element; a variable diaphragm arranged on the inside of the fixed cylinder and configured so that a movable part is rotated and a diameter is changed; a second operation part arranged on the outside of the fixed cylinder; and an actuation transmission cylinder allowed to be engaged with the fixed cylinder on the inside of the fixed cylinder, connected to the second operation part on a first engagement part, connected to a movable part of the variable diaphragm on a second engagement part separated from the first engagement part in the optical axis direction and having an aperture between the first engagement part and the second engagement part in the optical axis direction. The moving lens barrel is connected to the first operation part through the aperture of the actuation transmission cylinder. The moving lens barrel is moved in the optical axis direction by rotating the first operation part by a rotation/linear motion conversion part. |
