Toner concentration monitor

Details Toner concentration monitor Toner concentration monitor

1977-07-29

1979-02-27

Pellinen, A. D.

Photocopying

Including fiber optics

222DIG1, G03G 1509

Patent

active

041416457

ABSTRACT:
Apparatus for monitoring the concentration of toner particles in an electrographic developer mixture having toner and carrier particles in which a first signal is produced representative of the reflectivity of the developer mixture and an offset signal is produced representative of changes in the reflectivity of the developer mixture caused by the build up of a film of toner on the carrier particles. A computation device such as a digital computer in response to the first signal and the offset signal provides a correct representation of the concentration of toner in the developer mixture. When the toner concentration is below a desired level, the computation device actuates a toner replenishment mechanism which adds fresh toner to the developer mixture.

REFERENCES:
patent: 3233781 (1966-02-01), Grubbs
patent: 3575505 (1971-04-01), Parmigiani
patent: 3876106 (1975-04-01), Powell et al.
patent: 4026643 (1977-05-01), Bergman
Stephens, "Electrophotographic Apparatus Having Compensation for Changes in Sensitometric Properties of Photoconductors", Research Disclosure, No. 146, Jun. 1976, pp. 4-6, 355-414.

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