| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving circuit of a light-emitting element adapted to prevent the light-emitting element from causing abnormal light emission even if a short circuit is caused in an AC coupling capacitor for superimposing a modulating current on a bias current, and also to protect peripheral devices, and to provide an optical transmission device, a laser printer, and a laser writing device using the driving circuit. SOLUTION: A laser driving IC 10 for driving a semiconductor laser 30 is provided with a bias generating circuit 22 for supplying a bias current to the semiconductor laser 30, and a differential circuit formed of a couple of transistors 11a, 11b differentially amplifying differential modulating signals and outputting the resulting signals to output terminals 13a, 13b. Serially connected two AC coupling capacitors 90a, 90b are connected between the output terminal 13a and the anode of the semiconductor laser 30. COPYRIGHT: (C)2006,JPO&NCIPI
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