To respond the requirement of an improvement in speed and image quality of a semiconductor laser drive device in a laser beam printer, in addition, suppress radiation noise.
The circuit board has first and second wiring patterns 4, 5 connected to a main wiring pattern 2, a first circuit having a semiconductor laser element 7 and a drive circuit 9 for driving the semiconductor laser element, a second circuit 10 being connected to the second wiring pattern to compensate noise of the first circuit, a first capacitor 16 to be connected to a first point 14 in the first wiring pattern, and a second capacitor 17 to be connected to a second point 15 in the second wiring pattern, wherein the first and second points 14 and 15 are set such that a sum of impedance of the first wiring pattern and the first circuit viewed from the first point is approximately equal to a sum of impedance of the second wiring pattern and the second circuit viewed from the second point.
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Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura