| 摘要 |
PURPOSE:To enable the confirmation by the visual observation of a measuring point by installing the 2nd light source to form the 2nd spot of a visible light at the position of the 1st optical spot formed by a 1st light source. CONSTITUTION:A distance H is measured by picking up the optic spot projected on a work 8 from a 1st light source 3 by a photodetection lens 5. In this case the visible light radiated from 2nd light sources 9, 9 is condensed by lenses 10, 10 and a 2nd light spot is formed on the work 8. In this case if the work 8 conforms to the position of a stand off, the 2nd spot and the 1st optical spot 11 formed on a work 2 by the 1st light source 3 are coincident and the 2nd light spot 12 of a visible light becomes one as well. If the work 8 is dislocated from the stand off, the 2nd optical spot 12 of a visible light becomes two. Consequently the position of the stand off is clarified and the measuring point can be subjected to visual observation. |
