Toner concentration monitor

Details Toner concentration monitor Toner concentration monitor

1986-03-17

1987-11-10

Heyman, John S.

Coating apparatus

With means to apply electrical and/or radiant energy to work...

With electromagnetic and/or electrostatic removal of...

118689, 355 14D, 324 61R, 377 12, 73304C, 307602, B05C 1100, G03G 1502

Patent

active

047060328

ABSTRACT:
A toner concentration monitor senses changes in the effective dielectric constant of a developer mixture whose dielectric constant changes with variations in the toner concentration in the mixture. The monitor is the type having a capacitive probe immersible in developer mixture such that the capacitance value of said probe varies with the effective dielectric constant of the mixture. Means are provided for creating an electrical pulse train signal of predetermined frequency and variable pulse width. The pulse width is adjusted in response to the capacitance value of the probe. The pulses are created by a multivibrator circuit which is turned on by clock pulses and which has a time constant determined by the capacitance value of the probe. Each pulse has a first portion of fixed duration and a second portion of duration variable with the capacitance value of said probe. Means may be provided for attenuating the duration of said first portion relative to said second portion so as to increase the percent of the total pulse attributable to the second portion.

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