| 摘要 |
PURPOSE:To obtain a device capable of transmitting light for range finding, receiving light and measurement of angle through a single objective lens by providing the half of the upper face of a dichroic mirror with a prism with small width and providing further a prism for calibration in the light path of transmitted light. CONSTITUTION:A dichroic mirror 2 is arranged at the rear of an objective lens 1, and a prism 3 with the width that is smaller than the width of the dichroic mirror 2 is attached to the right or left of the upper face of the mirror 2. At the further rear position a lens 4 without focus, a focal plane 5 and an eye piece 6 are arranged to form a sighting system. Further, at the rear of the prism 3, a lens 7 without focus and a light transmitting element 10 are arranged to form a light transmitting system. In the light receiving system the reflected light passes through the dichroic mirror 2 and then through the space that does not contain the prism 3 and focuses images on the light receiving element 11. A circuit for calibration is formed by arranging a prism 9 in the light transmitting path and a right-angle prism 12 between the prism 9 and the light receiving element 11. |
