Method and apparatus for measuring a toner concentration of a tw

Details Method and apparatus for measuring a toner concentration of a tw Method and apparatus for measuring a toner concentration of a tw

1994-11-08

1996-05-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Fluid material examination

118690, 355208, G01N 2774, G03G 1508

Patent

active

055193161

ABSTRACT:
In an electrophotographic or electrostatic image forming device, the toner concentration of a two-component developer, i.e., a mixture of toner and carrier is measured on the basis of an output of a magnetic bridge type concentration sensor responsive to the magnetic permeability of the developer. The sensor has a surface whose mean roughness along the center line is less than 0.4 .mu.m Ra.

REFERENCES:
patent: 4186341 (1980-01-01), Noguchi et al.
patent: 4519696 (1985-05-01), Bruyndonckx et al.

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