| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens device that attains compactness and weight-lightness of the device by reducing the number of components, and can accurately control a diameter of a diaphragm aperture in accordance with a variation of a focal distance of an imaging lens.SOLUTION: Upon varying a magnification from a wide-angle end of a zoom lens to a telephoto end thereof, a lens device 30 is configured to rotate a rotating member 20 in an arrowed direction centering around an optical axis O. By a rotation of the rotating member 20, a lower bottom part of a diaphragm aperture-end regulation cam groove 23 slides relative to a diaphragm driving cam pin 15c of a diaphragm mechanism 10 and thereby gradually pushes up a position at which the diaphragm driving cam pin 15c is held. As a result, the diaphragm driving cam pin 15c is regulated such that the diaphragm driving cam pin 15c is not moved at any time in a direction where the diaphragm aperture is opened by the diaphragm aperture-end regulation cam groove 23, and thus, makes it possible to control such that light more than required is not entered at each zoom position. |
