| 摘要 |
PROBLEM TO BE SOLVED: To hold a stable light quantity by evading cross talk due to heat caused by plural light emission points. SOLUTION: An inputted image signal S is controlled by an image signal processing control part 14, and is divided to three parts in an image signal division part 15, and they drive drivers 16a, 16b, 16c, and light emission parts 1a, 1b, 1c of a semiconductor laser light source 1 light emit. At this time, the light emission points 1a, 1b are used as information write-in use, and the masked light emission point 1c is used as cross talk correction use, and two light emission points are light emitted always when the information is written in. Then, laser light L of a head part of an image effective part deflection scanned by respective reflection surfaces of a polygon mirror is detected by a synchronism detecting sensor, and the detected signal is fed back to the image signal division part 15, and the timing of the drive signal of the drivers 16a, 16b, 16c are taken by the detected signal. |
