| 摘要 |
PURPOSE:To move surely an image with a simple structure, by installing two sets of prism compensators composed of two prisms to the rear of the telecentric diaphragm of a subject image projecting optical system. CONSTITUTION:Two sets of prism compensators 31, in which two pieces of prisms are combined in opposite direction are installed to the rear of the telecentric diaphragm 6 of a subject image projecting optical system and a projected image is moved vertically and laterally by a motor 34. The image of a subject 2 wearing a frame 1 without lenses and a template 21 placed to the placing table 20 of an absorbing board fitting device 19 are projected upon a monitor TV17a under an overlapped condition and the frame 1 and template 21 are made to coincide with each other by rotating the compensator 31. Then, unworked lenses are placed on the template 21, the lenses are made to coincide with the pupil of the subject by adjustment, and the lenses are absorbed to the device 19 and the lenses are worked by using the template 21. In such a way, a pair of proper spectacles, in which the optical axis of the lenses and the pupil of the subject coincide with each other, can be obtained. |
