Toner density sensor for electrostatic copying machine

Details Toner density sensor for electrostatic copying machine Toner density sensor for electrostatic copying machine

1977-11-16

1980-04-29

Braun, Fred L.

Photocopying

Including fiber optics

118712, 222DIG1, 324200, G03G 1500

Patent

active

042003881

ABSTRACT:
A toner mixture comprising ferromagnetic carrier particles and non-magnetic toner particles are caused to flow through a conduit for measuring the toner density which is the ratio of toner particles to carrier particles in the mixture. The effective inductance of an electromagnetic coil disposed in the conduit varies in accordance with toner density. The coil is designed so that the magnetic lines of force thereof are substantially confined within the conduit and are not influenced by external bodies.

REFERENCES:
patent: 3802381 (1974-04-01), O'Neill et al.
patent: 3896279 (1975-07-01), Sugawara

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