LASER-DRIVING APPARATUS, ITS DRIVE METHOD AND IMAGE- FORMING APPARATUS USING THE SAME

摘要

PROBLEM TO BE SOLVED: To save the labor required for an adjustment process by connecting a common resistor of a current voltage conversion means to a light-receiving element and also to each of a plurality of non-common resistors and connecting the non-common resistors to the common resistor via a switching means and also to a control means. SOLUTION: A circuit for controlling a multibeam laser 1 is constituted of an initial adjusting resistance 5 and a fixed resistance 6 common to LD1 and LD2 driving control circuits 2 and 3. At the time of adjusting the LD1 (laser diode 1a), change-over switches SW 8a and 8b for a monitor current 4 are selected from a monitor current select signal 7 for the LD1 driving control circuit 2. At this time, the change-over switch 8b connects to freely open between the fixed resistance 6 and a non-common final adjusting resistance 9. Similarly, when the LD2 driving control circuit 3 is selected, a change-over switch 25b connects to freely open between the fixed resistance 6 and a non- common final adjusting resistance 26.