| 摘要 |
PURPOSE:To obtain an automatic optical beam tracking device in which the stability of a control system can be improved without depending on the error angle of an optical axis. CONSTITUTION:Reception light L1 is deflected by a tracking mirror 11, and is detected by a photodetector 13. Also, the photodetector 13 is connected to a tracking error angle detector 14, and the output of the tracking error angle detector 14 is connected to a memory part 15 and an arithmetic part 16. The memory part 15 is connected to the arithmetic part 16, and the output of the arithmetic part 16 is connected to a command signal generator 17. Also, the command signal generator 17 is connected to an optical beam adjusting mechanism 22. In such a case, the open loop gain of a control part 21 can be always kept constant by inputting correction data to negate the loss of a gain to the memory part 15, and correcting a tracking error angle according to the correction data. |
