Image recording apparatus with toner concentration detecting cir

Details Image recording apparatus with toner concentration detecting cir Image recording apparatus with toner concentration detecting cir

1993-07-01

1994-10-04

Smith, Matthew S.

Photocopying

Contact printing

Light boxes

355203, 355204, 355208, 118689, G03G 2100

Patent

active

053531035

ABSTRACT:
A toner concentration detecting circuit detects a toner concentration of a two-component developer composed of toner and a carrier by detecting a change of magnetic permeability of the two-component developer. The detecting circuit is used in a developing device of an image recording apparatus. The toner concentration detecting circuit includes a sensor for sensing a change of a magnetic permeability of the two-component developer, a waveform corrector, a counter connected to a control CPU and a gate signal generating circuit connected to the control CPU so that a gate signal is sent to the counter.

REFERENCES:
patent: 4435677 (1984-03-01), Thomas
patent: 4478173 (1984-10-01), Doehler
patent: 4515292 (1985-05-01), Koos, Jr.
patent: 5075726 (1991-12-01), Itaya et al.
patent: 5189475 (1993-02-01), Fournia et al.

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