| 摘要 |
PURPOSE:To obtain the excellent picture exposure device having no color slurring or the like in its photosensitive material by ensuring line start point synchronization at the time of write by each raster even when a light beam intensity of each raster at the multi-light beam different angle incident optical system is not sufficiently higher than the sensitivity of a start point synchronization sensor implementing line synchronization of each raster. CONSTITUTION:The subject picture exposure device is an exposure device in which after a start point synchronization optical sensor 28 detects a light beam of a head maximum optical output, other light beam is extinguished for the start point synchronization or an exposure device in which one light beam is left after all other light beams reach a specified optical output and the other light beams are extinguished, the remaining light beam is detected by a photosensor 28 to implement the start point synchronization, and an exposure device in which only one light beam among plural light beams is made incident on the photo sensor 28 and the optical system is arranged so that the other light beams are not made incident on the photo sensor by a reflecting face of a light deflector 22, an edge of an ftheta lens or a shield. |
