Toner density control device with adjustable reference values fo

Details Toner density control device with adjustable reference values fo Toner density control device with adjustable reference values fo

1990-07-24

1991-12-24

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118689, 355208, 355326, G03G 2100

Patent

active

050757261

ABSTRACT:
A toner density control device of an electrophotographic recording apparatus in which development is conducted by a plurality of developing units with two-component developer wherein a toner density detecting device can detect the density of toner loaded in the plurality of developing units according to the variation of magnetic permeability of the developer. The detecting device is composed of a sensor provided to each developing unit, and a signal processing unit to process the output of the sensor selected by a selector. And toner is supplied according to the difference between the detected value of the detecting device and the reference value which is previously established.

REFERENCES:
patent: 4141645 (1979-02-01), Reid et al.
patent: 4932356 (1990-06-01), Watanabe et al.
patent: 4955317 (1990-09-01), Kinoshita et al.
patent: 4956668 (1990-09-01), Arnold et al.

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