| 摘要 |
In an image forming apparatus, plural LED light sources are provided for emitting lights of respectively different wavelengths, and, in reading an illuminated image with a reading sensor, a lighting mode setting register selects a first mode for reading the image with a single color or a second mode for reading the image with plural colors. The light emitting time of these light sources are set by a light emitting time control register, a light emitting time counter and an automatic light emitting time adjustment circuit, and the currents supplied to the light sources are set by a lighting current control circuit. A CPU controls these circuits according to the selected mode.
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