| 摘要 |
PURPOSE:To measure range with extremely high precision without putting an object in a range measurement mark by using a reflection system for projection which splits luminous flux in directions as many as range measurement points on a subject plane and reflecting the light and a photodetector which detects the range of the body. CONSTITUTION:The reflection system 6 for projection which splits the luminous flux from a projecting element 1 into plural pieces of luminous flux to range measurement points in the subject plane 7 through a projection lens 2 consists of plural mirrors 10, 11... which differ in normal direction. Then, reflected luminous flux of a spot image is converged by a photodetection lens 4 and all incident on a photodetecting element 5 through a reflection system (mirrors 13, 14...) similar to the reflection system 6. In this case, when the light beams are all equal in subject distance, they are superposed one over another at the same position on the photodetecting element 5 and when not, incidence positions shift according to the distance, so the distance to the object is obtained precisely through the simple constitution without putting the object to be range-found in the small range measurement mark, and the operability and functionality of the range measuring instrument are improved remarkably. |
