| 摘要 |
PURPOSE:To facilitate the fine adjustment of a lens in an optical axis direction and to maintain an applied voltage constant by providing an elastic member at one end side of a barrel in which a lens is mounted and a piezoelectric actuator for displacing it in an optical axis direction by an applied voltage at the other end side. CONSTITUTION:A collimation lens 4 is contained in a barrel 5, which is inserted into the barrel engaging hole of a mount holder 1, a ringlike elastic element 6 is disposed at the end side of the barrel of a semiconductor laser, and a cylindrical piezoelectric actuator 7 to be displaced in an optical axis direction is disposed at the barrel end face of opposite side. The bore threads of a holder cap 1a are associated with the outer threads of the holder 1 to be so secured as to become the fixed end face of the actuator 7, and the barrel 5 is always pressed by the element 6 to the end face of the actuator. Accordingly, when the actuator 7 is displaced, the barrel 5 is moved along the engaging bore of the holder 1. |
