SEMICONDUCTOR LASER DRIVING DEVICE CAPABLE OF HIGH-PRECISION DETECTION OF LASER DETERIORATION AND AN IMAGE FORMING APPARATUS EQUIPPED WITH THE SAME

摘要

PURPOSE: A semiconductor laser driving device and an image forming apparatus equipped with the same are provided to detect laser deterioration in an external device using a digital driving current value.;CONSTITUTION: A semiconductor laser driving device(7) comprises a PMOS transistor forming a current mirror circuit, a semiconductor laser driving control circuit(11) which controls the gate voltage of the PMOS transistor according to control signals of an image control device(6), a current-output type D/A conversion circuit(12) which outputs current with a current value according to a 8-bit current control signal, a comparator(13), an NMOS transistor, an oscillating circuit(14), a counter circuit(15), an inverter circuit(16), an AND circuit(17), and a memory circuit(18).;COPYRIGHT KIPO 2012