| 摘要 |
Disclosed herein is an exposure intensity detecting system suitable for use in a copying machine. The detecting system is characterized in that a light-shielding plate is arranged underneath a glass table for an original document and defining therethrough a projection slit and a detection slit which extends in parallel with the projection slit. The intensity of light passed through the detection slit of the light-shielding plate is detected by a photosensor. The detecting system can correctly detect the intensity of light, which is to be used for the exposure of a photosensitive member, without giving any influence to the distribution of light to be employed for the illumination of the original document and to the exposure of the photosensitive member. By controlling the quantity of light to be radiated from a light-source lamp in accordance with detection signals of the photosensor, it is always possible to achieve good exposure and hence to form superb duplicate marks.
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