| 摘要 |
PURPOSE:To obtain the positioning mechanism which easily positions the knife- edge and is hardly affected by temperature variation by fixing the knife edge to one side of a leaf spring which is formed in a folding shape, and applying force to the other side of said spring and making a jogging adjustment of the knife edge. CONSTITUTION:The device consists of the leaf spring 1, knife edge 3, leaf-spring fitting screw 4, and adjusting screw 5, and the knife-edge 3 is fixed to a fitting plate 2 molded integrally with the leaf spring 1 by adhesion, welding, etc. The leaf spring 1 is fixed with the fitting screw 4 and the end surface of the leaf spring is moved with the adjusting screw 5; and the leaf spring 1 deforms elastically at this time to exert its influence upon the knife edge side, and the knife edge is moved forth and back so that the motion of the adjusting screw is reduced. The movement extent of the knife-edge part is increased at a loading point and the movement extent at the loading point is converted into a rotational angle through the adjusting screw 5, so the knofe edge 3 is positioned easily. Further, the knife edge 3 hardly shifts in position owing to temperature variation and defocusing is detected stably. |
