| 摘要 |
PURPOSE:To obtain the optical axis controller which can securely correct and adjust laser optical axis variation to a certain angle variation by an inexpensive method. CONSTITUTION:A dichroic mirror prism 2 which splits light into transmitted light T and reflected light K is arranged on the optical path of a corner cube 1 on a projection light side and a quadripartite photodetecting element 3 is arranged on the optical path of one small-quantity piece of luminous flux split by the dichroic mirror 2 so that its reference optical axis (a) is in the center; and a mirror 4 is arranged at a position which is conjugate in optical path length to the quadripartite photodetecting element 3 as to the other large- quantity piece of luminous flux separated by the mirror prism 2 and a corner cube driving means which performs the biaxial servo driving of the corner cube 1 so that the output of the quadripartite photodetecting element 3 is always 0 or a certain value is provided. |
