Toner concentration sensing apparatus

Details Toner concentration sensing apparatus Toner concentration sensing apparatus

1991-08-30

1992-11-24

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118689, 324445, 324654, 355203, 355246, G03G 2100

Patent

active

051667290

ABSTRACT:
In accordance with the present invention an apparatus is provided for use with a developer container adapted to retain a quantity of developer material, the developer material including varying concentrations of magnetic carrier material and toner material. The toner concentration sensing apparatus comprises a device for generating a magnetic field within the developer container. The apparatus further comprises a device for controlling the generating device to selectively generate the magnetic field within the developer container, wherein a preselected portion of the developer material is compressed by the magnetic field and a signal is generated across the generating device, the signal across the generating device varying as a function of the concentration of the toner.

REFERENCES:
patent: 3355661 (1967-11-01), Nonaka
patent: 3572551 (1971-03-01), Gillespie
patent: 3698926 (1972-10-01), Furuichi
patent: 3707134 (1972-12-01), Gawron
patent: 3802381 (1974-04-01), O'Neill et al.
patent: 3970036 (1976-07-01), Baer et al.
patent: 4342283 (1982-08-01), Terashima
patent: 4706032 (1987-11-01), Allen et al.
Xerox Disclosure Journal Toner Concentration Meter vol. 5 US #3 May 1980-Jun. 1980.

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