| 摘要 |
PURPOSE:To correct the long and short directions of an elliptic beam easily and to obtain an excellent scanning image by fitting a beam generation source which generates the beam with an elliptic light quantity distribution rotatably around the optical axis of the beam. CONSTITUTION:A far visual field image of the laser beam 2 generated by the laser chip 1a of a semiconductor laser 1 has the elliptic distribution. The scanning optical device deflects and scans the beam through a rotary polygon mirror 3 and a lens frame 32 which holds a holding frame 31 for the semiconductor 1 and a collimator lens 28 is fitted in the hole of a case 33a and fixed with a stop screw 34, so the stop screw 34 is loosened to rotate the direction of the light emission pattern distribution of the laser beam 2 around the optical axis. For the purpose, the lens frame 32 is rotated to make an adjustment so that the short-axis direction of the ellipse of the laser beam on a surface of the polygon mirror 3 coincides with the rotating shaft direction of the polygon mirror 3. |
