| 摘要 |
PURPOSE:To prevent interception of a laser beam and extremely reduce energy loss by omitting an aperture which intercepts a part of the laser light and directly attaching a light detecting means to a reflecting mirror. CONSTITUTION:Output signals 7e of light detecting means 7d directly attached to reflecting mirrors 5 and 6 are operated by a CPU 8, and a motor 4a is driven through a motor driving signal 9a from a driving circuit 9 based on the signal from the CPU 8 to change the angle of a first reflecting mirror 4 so that a laser light 2b is projected to the center of a second reflecting mirror 5. Reflecting mirrors 5 and 6 are controlled as the first and second reflecting mirrors, and the positional deviation of the optical axis of the laser light is detected by the light detecting means of the reflecting mirrors at the down stream side to successively adjust the angles of reflecting mirrors at the upstream side, and thereby, the laser light 2 is transmitted to pass centers of all reflecting mirrors. Thus, the energy loss is reduced and the laser light is always transmitted with the beam position fixed. |
