| 摘要 |
An illumination detector is positioned adjacent one surface of a wedge-shaped light pipe which is optically coupled to a mirror in a scanning system. The light coupled into the light pipe is representative of the illumination reflected from a document scanning plane, yet is totally internally reflected from the angled surface of the light pipe to produce a uniform, integrated illumination level at the photosensor. This photosensor output represents an exposure level used to adjust the output of a document illumination power supply.
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