Liquid developer charge director control

Details Liquid developer charge director control Liquid developer charge director control

G - Physics

03

G

314/37

G03G 15/10 (2006.01)

Patent

CA 1281763

Abstract of the Disclosure A copier wherein charge director is supplied to a liquid developer in response to a conductivity measurement thereof. The toner concentrate is deficient in charge director and 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 excited by a variable alternating voltage source through a fixed resistor. The effects of inherent capacitance between electrodes are neutralized by a variable capacitor. A phase sensitive detector is provided with a reference voltage having the same phase shift as occasioned by capacitive effects. The copier is disabled if developer conductivity decreases appreciably below the desired value or if the developer temperature becomes excessive. The developer conductivity measurement is corrected by a developer temperature measurement.

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