| 摘要 |
PROBLEM TO BE SOLVED: To prevent a divergence of focus and to make the turning response speed of a mirror higher in the case of correcting an optical axis in a light spatial transmission device. SOLUTION: When incident light L1 is reflected on the reflection surface 12a of the mirror 12 and radiated to a position detection sensor 7, deviation ΔS between an incidient point P1 on the sensor 7 and a reference position PO is detected on this optical axis correcting device 10 side. In order to correct the optical axis by as much as the deviation ΔS, the device 10 drives Y-axis driving mechanism parts 18 and 19 so as to change the angle of the reflection surface 12a of the mirror 12. At such a time, the position of a reflecting part on the reflection surface 12a in a Z-axis direction is prevented from being displaced. For example, the driving force of '-2' is given to the mechanism part 18 and simultaneously the mechanism part 19 is made to keep the state of '±0'. Thus, the mirror 12 is turned in the same direction by the same angle as in the case of giving the driving force of '-$1' to the mechanism part 18 and the driving force '+1' to the mechanism part 19 without displacing the reflecting part in the Z-axis direction. |
