Method of detecting a toner concentration

Details Method of detecting a toner concentration Method of detecting a toner concentration

1976-04-06

1977-10-18

Reeves, Robert R.

Dispensing

Processes of dispensing

222 56, 222DIG1, 118646, B67D 508, G03B 2700

Patent

active

040542300

ABSTRACT:
The method detects a toner concentration in a developer comprising a mixture of magnetic carrier particles and a non-magnetic toner through the determination of a leakage magnetic flux with a Hall element having a high sensitivity. The mixture is first shaped into a predetermined configuration and brought into a fixed magnetic field where the leakage magnetic flux is sensed by the Hall element. The shaped mixture may be a magnetic brush per se in case of the well-known magnetic brush device used. Such a Hall element is very susceptible to a variation of environmental temperature and thus requires a compensation therefor upon the determination of magnetic field. In one aspect of the invention, the compensation may be conveniently achieved by detecting a voltage across the control current terminals of the Hall element and supplying the detected result into an input of analog calculator.

REFERENCES:
patent: 3484022 (1969-12-01), Day
patent: 3910459 (1975-10-01), Bock et al.
patent: 3926337 (1975-12-01), O'Neill et al.

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