| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for easily judging an abnormal semiconductor laser. SOLUTION: In the image recording apparatus to scan and expose a recording medium with a laser beam emitting from a fiber-coupled semiconductor laser, the laser light quantity on the recording surface of the recording medium is detected by continuously lighting the semiconductor laser for a sufficiently long time. The light quantity of the semiconductor laser is controlled, the driving current of the semiconductor laser is determined, the semiconductor laser is lightened in accordance with specified pattern signals by the driving current, and the average light quantity of the laser on the recording surface is measured. When the proportion of the difference between the laser light quantity for continuous lighting and the average light quantity exceeds a specified range, the semiconductor laser is discriminated as abnormal. COPYRIGHT: (C)2005,JPO&NCIPI
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