| abstract |
(57) [Summary] [Purpose] To obtain a current pulse waveform without overshoot or ringing. Also, the generation of parasitic inductance is suppressed. In a semiconductor light emitting element drive circuit for driving the light emitting element 4, a control signal for driving the light emitting element 4 is input to a base, and in response to the control signal, an emitter It has a bipolar transistor 1 that drives the light emitting element by flowing a current between collectors, and an insulated gate transistor 3 that operates as a constant current source and is connected to the bipolar transistor 1. |