| 摘要 |
PURPOSE:To position an optical system with high accuracy and with simple consistitution, by providing a movable base which holds said optical system, and an internal screw part and a fitting part provided to the base along the moving direction thereof. CONSTITUTION:A lens 30 is mounted in the top surface part of a movable base 33 by means of a mounting fitting 34. An internal screw part 35 and a fitting part 36 are provided in one body at a prescribed spacing in the bottom surface part on one end side of the base 33 along the moving direction thereof. The external screw part 38 of a shaft 37 is fitted into the fitting part to move the base 33. The base can thus be transferred and guided with one shaft, and the construction is simpler and the positioning is accomplished with higher accuracy as compared to the case in which two shafts are required as in the prior art. |
