| 摘要 |
PURPOSE:To execute an optical scan to a correct position by only inputting a data, and also to execute a roughly linear scan in the periphery of the scan by providing a position coordinate correcting circuit for correcting a scan distortion received by an optical scan optical system, on an input side of a galvanometer. CONSTITUTION:When scanning an input light onto a prescribed scan surface by using two galvanometers and an optical system, a coordinate correcting part 20 is inserted into an input side of the galvanometer. A position coordinate which has corrected a scan distortion peculiar to the galvanometer and the optical system which are used is outputted to a coordinate position inputted to the galvanometer by the correcting part 20. As a result, a distortion received by a scan optical part 16 is corrected by the correcting part 20, therefore, the final position coordinate can be made to coincide with an inputted data. Accordingly, an optical scan is executed to a correct position by only inputting the data, and also a roughly linear scan can be executed in the periphery of the scan, too. |
