| 摘要 |
A document reader has a light source which is turned on upon energization, a read unit for reading an image of a document illuminated by the light source and a control circuit for controlling the energization of the light source. The read unit reads an intensity of a light reflected by a reference density pattern arranged externally of a document area prior to reading of the document and controls the energization of the light source in accordance with the detected light intensity.
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