Liquid developer charge director control

Details Liquid developer charge director control Liquid developer charge director control

1988-07-25

1989-08-29

Huppert, Michael S.

Dispensing

Automatic control

Delivery from source controlled by quantity in discharging...

222DIG1, 355256, 118689, G03G 1510

Patent

active

048609242

ABSTRACT:
A copier wherein charge director is supplied to a liquid developer in response to a conductivity measurement thereof. Toner concentrate deficient in charge director is supplied to the liquid developer in response to an optical transmissivity measurement thereof. Conductivity is measured by a pair of spaced electrodes immersed in the developer and through which a variable alternating current is passed. A variable capacitor neutralizes the inherent capacitance of the electrodes. A phase sensitive detector is provided with a reference voltage having the same phase shift as that caused by capacitive effects. The conductivity measurement is corrected in response to a developer temperature measurement.

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patent: 4660152 (1987-04-01), Downing et al.
Patent Abstracts of Japan, Vol. 4, No. 156 (p. 34) 10-31-80 and JP A-55-103 570 (Canon K.K.) 7-8-80.

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