| 摘要 |
Photosensors are inserted as amount-of-light detecting units between light sources and a photosensitive medium by a moving mechanism, and detect amounts of light of light beams emitted from the respective light sources. In order to equalize the detected amounts of light, an amount-of-light control circuit adjusts the light sources to avoid image irregularities which would otherwise be caused by differences between the amounts of light of the light beams emitted from the light sources.
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