| 摘要 |
PURPOSE:To reduce the size of a titled device and to perform scanning without disturbance by connections by making the rays from plural light sources incident to the different mirror surfaces of one piece of rotary polyhedral mirror and scanning plural scanning regions without interruption. CONSTITUTION:The rays from laser diodes 7-1, 7-2 are reflected on the different surfaces of a rotary polyhedral mirror 8, and pass respectively through imaging optical systems 9, which scan the inside of the regions bisected from the entire scanning region by plane mirrors 10. Thus, the size of the device is reduced. If the boundary points of the partial scanning adjacent in the boundary regions are set at random, the disturbance by connections is suppressed. Therefore, a table 1 which stores the distances m between the randomly selected boundary points and a reference point and a table 2 which stores the data in the partial regions are prepared, and the inside of the partial scanning region 1 is scanned with the start signal of a line start signal generating part 11, and when the scanning cames to the reference point, the table 1 is referred to, and when the scanning advances by m, the inside of the partial scanning region 2 is scanned, and the data 13 scanned 12 by the data n is controlled in a modulation control part 14. |
