Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1989-06-06
1990-12-18
Hix, L. T.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 71, G03B 2736
Patent
active
049789937
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.
REFERENCES:
patent: 4740815 (1988-04-01), Tsuruoka
patent: 4806989 (1989-02-01), Saito et al.
Kang Seung-Il
Kim Geun
Hix L. T,.
Meller Michael N.
Rutledge D.
Sindo Ricoh Co., Ltd.
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