Digital implementation of toner concentration sensing apparatus

Dispensing – Automatic control

Patent

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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.

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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.

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