Toner density detector and toner supplier

Details Toner density detector and toner supplier Toner density detector and toner supplier

1983-10-20

1987-03-10

Grimley, Arthur T.

Photocopying

Including fiber optics

355 14D, 118691, G03G 1500

Patent

active

046487026

ABSTRACT:
A toner density detecting device has NESA glass, a bias voltage source, a resistor and/or a varistor or Zener diode, and a luminosity detecting circuit which detects the density of toner adhering to the NESA glass using a light source and a photodiode as a light receiving element. The resistor permits detection at a high voltage without causing breakdown while the provision of the varistor in parallel with the resistor permits the application of constant voltage to the NESA glass. In addition a toner supply device has a detector and a toner supply circuit which compares the detection signal from the detector with two reference signals included therein to supply either a constant amount of toner or supply the toner for a predetermined period of time.

REFERENCES:
patent: 3234432 (1966-02-01), Streib
patent: 3554161 (1971-01-01), Blanchette
patent: 4343548 (1982-08-01), Bares et al.
patent: 4383752 (1983-05-01), Kisler
patent: 4419960 (1983-12-01), Okamura et al.
patent: 4431300 (1984-02-01), Snelling
patent: 4462680 (1984-07-01), Ikeda
patent: 4466732 (1984-08-01), Folkins
Automatic High and Low Limit Toner Dispenser Control-Tolliver, Xerox Disclosure Journal, vol. 5, No. 6, Nov./Dec. 1980.

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