Toner concentration detecting device

Details Toner concentration detecting device Toner concentration detecting device

1982-04-16

1985-11-05

Braun, Fred L.

Photocopying

Including fiber optics

118691, 355 14D, G03G 1508

Patent

active

045509980

ABSTRACT:
A magnetic brush developing apparatus including a magnet roll assembly to apply a dry-type, two-component, magnetic developer having magnetic carrier particles and toner particles to an electrostatic latent image to be developed. The toner concentration of the developer is detected by projecting light toward ear-ups of the developer through a transparent plate which is arranged at such a position that the ear-ups of the developer held and carried by the magnetic roll assembly are brought in contact with the plate and by receiving light scattered by the developer through the transparent plate. The transparent plate is formed as a transparent plate to which is applied a bias voltage of such polarity that the charged toner is repelled by the plate.

REFERENCES:
patent: 3765654 (1973-10-01), Rarey et al.
patent: 4346985 (1982-08-01), Watson et al.
patent: 4347299 (1982-08-01), Ozawa et al.
patent: 4369733 (1983-01-01), Hirakura et al.
patent: 4431300 (1984-02-01), Snelling

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