LIGHT SOURCE DRIVE CIRCUIT, OPTICAL SCANNING APPARATUS, SEMICONDUCTOR DRIVE CIRCUIT, AND IMAGE FORMING APPARATUS

摘要

A light source drive circuit which drives a light source is disclosed, including a drive current generating unit which generates a drive current, the driving current including a predetermined current for obtaining a predetermined light amount from the light source; and first and second overshoot currents which are applied to the predetermined current in synchronization thereto; and a control unit which sets, to the drive current generating unit, a value of the first overshoot current to a fixed value, and a value of the second overshoot current in accordance with a light amount output from the light source.

主权项

1. A semiconductor laser drive circuit which drives and modulates a semiconductor laser, comprising:
a current source which supplies a drive current for driving and lighting the semiconductor laser; a first overshoot current source which supplies a current at a time of a rise of the drive current; and a second overshoot current source which supplies a current at the time of the rise of the drive current, wherein a time in which the first overshoot current source supplies the current is a time which is shorter than a time in which the semiconductor laser responds to the drive current; and a time in which the second overshoot current source supplies the current is longer than the time in which the first overshoot current source supplies the current and is shorter than the time in which the semiconductor laser responds to the drive current.