| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens device capable of performing focusing operation to be performed by the movement of a lens in an optical axis direction by means of a piezoelectric actuator arranged inside a lens barrel. SOLUTION: In this lens device constituted of a first lens 72, a main mirror 74, a sub-mirror 81, a second lens 77, and a third lens 78; the piezoelectric actuator 82 directly moves the mirror 81 in the optical axis direction so as to perform the focusing operation. The driving circuit 95 of the actuator 82 is arranged on a space part inside the trailing part of the lens barrel obtained by eliminating an unnecessary reduction mechanism which is arranged inside the trailing part of the lens barrel in a conventional lens device. The circuit 94 can easily be housed without making the outside size of the lens barrel large. |
