Correction device for non-uniform illuminations in ratio-variable copy machine
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United States of America Patent
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-
Dec 18, 1990
Grant Date -
N/A
app pub date -
Jun 6, 1989
filing date -
Jun 6, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A correction device for non-uniform illumination is disclosed for use in a copy machine in which ratio variations such as enlargement and reduction copyings are possible. The original sheet to be copied is placed at the center, and some measures are provided to correct the non-uniformness of the illumination in the lengthwise direction of the slit. The improvements of the present invention comprise a pair of light adjusting plates disposed pivotally around a shaft and at a distance from the lens; and a pair of auxiliary light adjusting plates for adjusting the position of the light adjusting plates in an interlocked state with the displacement of the lens. The light adjusting plates are not to shield the light path in the case of enlargement copying ratios, but the plates are properly displaced to shield the light path correspondingly with the copying ratio variations only in the case of reduction copyings in order to correct the non-uniformness of the illumination in the lengthwise direction of the slit.
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