| 摘要 |
PROBLEM TO BE SOLVED: To provide a laser printer in which the frequency of exchanging a light source is low and print density is stabilized. SOLUTION: The laser printer comprises a plurality of laser light sources 6 and 7, a means 15 for selecting a laser light source being operated to emit light, and a means 8 for synthesizing lights from respective light sources. When one laser light source 6 deteriorates, another laser light source 7 is operated to emit light. COPYRIGHT: (C)2004,JPO
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