| 摘要 |
PURPOSE:To adjust the degree of parallelism of a luminous flux by providing an adjusting means which adjusts the position of a guide means so that two or more luminous fluxes guided by the guide means are scanned in parallel with each other in an exposure part. CONSTITUTION:Two laser beams 12 and 13 are converted to parallel beams by collimator lenses and go in parallel and are made incident on a rotary mirror 30. Reflected laser beams 12 and 13 are divided to different directions by a dividing mirror 32 after correction of scanning distortion due to an ftheta lens 31, and thereafter, they pass turning-back mirrors 33 to scan and expose a photosensitive drum 15. The deep side of the turning-back mirror 33 is inserted to a through hole 40 of a deeper holder 35, and the turning-back mirror 33 is pressed and energized by a spring 41, and turning displacement in the energizing direction is controlled from the opposite side by an adjusting screw 42, and thus, inclination of this turning-back mirror 33 is adjusted. |
