Dispensing – Automatic control
Patent
1983-05-19
1985-05-07
Rolla, Joseph J.
Dispensing
Automatic control
222DIG1, 222 57, 118689, B67D 514
Patent
active
045152926
ABSTRACT:
A toner concentration sensor senses the concentration of toner in the toner system of an electro-photographic printer or copier. A novel circuit improves the toner concentration sensor. The novel circuit is composed of a resonant circuit, a frequency source, and a logic circuit. The resonant circuit is tuned to a selected frequency and has an inductor which creates a field into which the toner system is introduced. A frequency source excites the resonant circuit. A logic circuit receives a signal from the frequency source and an output from the resonant circuit. The logic circuit output is a signal representative of the phase shift between the signal from the frequency source and the output of the resonant circuit. The phase shift is representative of the inductance of the inductor in the presence of said toner system. The measurement of the inductance is representative of the concentration of toner in said toner system.
REFERENCES:
patent: 3966034 (1976-06-01), Heinman et al.
patent: 3999687 (1976-12-01), Baer et al.
patent: 4195260 (1980-03-01), Sakamoto et al.
patent: 4380309 (1983-04-01), Takahashi
Millman, Jacob and Halkias, Christos C., Integrated Electronics: Analog and Digital Circuits and Systems, 1972, McGraw-Hill Book Company, p. 569.
Burroughs Corporation
Chung Edmund M.
Jones Andrew
Peterson Kevin R.
Rolla Joseph J.
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