Copying apparatus

Details Copying apparatus Copying apparatus

1991-10-09

1993-07-13

Gellner, Michael L.

Photocopying

Contact printing

Light boxes

354482, 355 38, G03G 1504

Patent

active

052278450

ABSTRACT:
An apparatus for performing a copying operation contains a photosensitive drum, a focusing optical system for directing reflected light from an original image onto the photosensitive drum, a lamp for lighting the original image, a light quantity sensor for detecting the quantity of reflected light from the original image and for controlling the quantity of light of the lamp on the basis of the detected value of the quantity of reflected light, a first filter provided in an optical path of the focusing optical system so as to cut-off light having a wavelength not longer than a predetermined value, and a second filter provided on a light-detection surface of the light quantity sensor. The second filter has a cut-off wavelength point shorter than the first filter.

REFERENCES:
patent: 4226527 (1980-10-01), Lama et al.
patent: 4774548 (1988-09-01), Beaulieu et al.
patent: 4905039 (1990-02-01), Terashita
patent: 5065184 (1991-11-01), Iimori et al.
patent: 5083154 (1992-01-01), Terashita et al.
patent: 5084729 (1992-01-01), Yakubo et al.

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