Coating apparatus – Control means responsive to a randomly occurring sensed... – Responsive to condition of coating material
Patent
1980-07-25
1983-06-28
Lawrence, Evan K.
Coating apparatus
Control means responsive to a randomly occurring sensed...
Responsive to condition of coating material
118658, 222 57, 222DIG1, B05C 1900, G03G 1509
Patent
active
043899722
ABSTRACT:
A toner concentration control system for use in electrophotographic copying machines or the like, wherein light from a single light source is simultaneously detected by two photosensors, or by two sensing portions of a single photosensor, the light striking one of the photosensors (or portions) directly and the other after being reflected from developer comprising toner and carrier particles as the developer passes a viewing window in a chute provided for the transport thereof within the copying machine, the intensity of the reflected light being inversely proportional to the concentration of toner in the developer, whereby, by comparison of the output of the photosensors (or portions) by conventional means, the concentration of toner in the developer can be determined and adjusted, the photosensors (or portions) having been carefully selected as a pair of their essentially identical characteristics and response to ambient conditions so that, for example, their parallel deterioration with time or their identical response to changes in temperature will not adversely affect the accuracy of the toner-concentration determination, the portion of the embodiment comprising the light paths, the photosensors, the light source and the external surface of the viewing window being completely sealed from the remainder of the interior of the copying machine, thereby eliminating the adverse affects on measurement and long-term reliability of inevitable airborne particles of developer.
REFERENCES:
patent: 3233781 (1966-02-01), Grubbs
patent: 3399652 (1968-09-01), Gawron
patent: 3610205 (1971-10-01), Rarey et al.
patent: 3756192 (1973-09-01), Locklar et al.
patent: 4171909 (1979-10-01), Kramer et al.
patent: 4266141 (1981-05-01), Hirakura et al.
Hirakura Koji
Iijima Takeshi
Sawada Yasuo
Watase Kenta
Burke Henry T.
Gerber Eliot S.
Lawrence Evan K.
Ricoh & Company, Ltd.
Shoup Guy W.
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