Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1986-06-02
1988-02-16
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 69, G03G 1504, G03G 2100
Patent
active
047258683
ABSTRACT:
An electrostatic copying machine having an optical system for exposing to light an original placed on a contact glass plate, a sensor for detecting the density of the original and a control system for controlling image density in accordance with a detection signal from the sensor, the glass plate being provided with a light blocking white portion at a reference position thereon where the front end of the original is placed. A light blocking colored area reflecting a smaller quantity of light than the white portion is provided in the white portion at least at the part thereof corresponding to the position of detection by the sensor. Although the white portion provided for preventing the front end of copy paper from fitting around a fixing roller would result in a reduced amount of exposure for the front end portion of the original to produce an increased image density at the paper end portion and all over the paper in the case of the prescanning system, the presence of the colored area assures proper automatic density control free of such objection.
REFERENCES:
patent: 4200391 (1980-04-01), Sakamoto et al.
patent: 4215930 (1980-08-01), Miyakawa et al.
patent: 4306804 (1981-12-01), Sakamoto et al.
patent: 4378156 (1983-03-01), Yajima et al.
Braun Fred L.
Mita Industrial Co. Ltd.
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