Photocopying – Contact printing – Light boxes
Patent
1989-08-21
1990-11-27
Grimley, A. T.
Photocopying
Contact printing
Light boxes
118691, G03G 2100
Patent
active
049740253
ABSTRACT:
The present invention provides a method of controlling toner concentration in a developing apparatus that uses a two-component developer consisting of a carrier and a toner, wherein the change in toner concentration in the developing container containing the developer is not taken out as it is to carry out the toner concentration control, but an approximately periodic waveform component is lapped over the detection signal to produce a waved detection output oscillated with the detection signal between the center, then the detection output and the control standard level corresponding to a prescribed toner concentration level are compared, and a level signal "Hi" and a level signal "Lo" plus a proportional pulse signal whose pulse width changes approximately proportionally between the level signals "Hi" and "Lo", that is, three types of signals are obtained from the comparison output, thereby making the toner supply operation different in conformity with the type of the signal.
REFERENCES:
patent: 3876106 (1975-04-01), Powell et al.
patent: 4119989 (1978-10-01), Carvalko et al.
patent: 4758861 (1988-07-01), Nakamaru et al.
Grimley A. T.
Hoffman Sandra L.
Kyocera Corporation
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