| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor laser array light quantity control circuit capable of performing high-precision APC even when the number of semiconductor lasers increases, and to provide an image forming apparatus using the semiconductor laser array light quantity control circuit. SOLUTION: The semiconductor laser array light quantity control circuit includes a photodiode PD which receives the quantities of light outputted from respective semiconductor lasers LD31 and LD32 and automatic light quantity control circuits 10 and 20 which perform control to set the quantities of light outputted from the corresponding semiconductor lasers LD31 and LD32 to the prescribed quantity of light emission corresponding to the output of the photodiode PD according to inputted automatic light quantity control signals APC1 and APC2. While one automatic light quantity control circuit performs automatic light quantity control according to an input automatic light quantity control signal, the other automatic light quantity control circuit stops operating to cease current supply to the semiconductor lasers. COPYRIGHT: (C)2010,JPO&INPIT
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