Apparatus and method for measurement of the ratio of toner parti

Details Apparatus and method for measurement of the ratio of toner parti Apparatus and method for measurement of the ratio of toner parti

1975-08-22

1977-05-31

Hix, L. T.

Photocopying

Including fiber optics

118 8, 118646, 355 14, G03G 1500

Patent

active

040266435

ABSTRACT:
Apparatus and method for measurement of the ratio of the triboelectric toner particle charge to the toner particle mass in electrostatographic apparatus. The ratio of the toner particle charge to the toner particle mass is determined by combining a measurement of the difference between the electrostatic photoreceptor potential in the presence and in the absence of charged toner particles with a measurement of a difference in optical reflectance in the presence and in the absence of charged toner particles. The measurement of the difference in the electrostatic potential of the photoreceptor provides a quantity proportional to the toner particle charge per unit area. The measurement of the difference in optical reflectance provides a quantity related to the toner mass per unit area, a quantity that is linear for low particle densities. Combining the two difference measurements provides a quantity proportional to the toner charge per toner mass.
Apparatus is disclosed for deriving a signal related to the toner charge to toner mass during electrostatographic processing and providing a feed back control signal for maintaining the ratio of the toner particle charge to toner particle mass in an acceptable range by controlling the ratio of the toner particles and the carrier particles in the developer mixture.

REFERENCES:
patent: 3674353 (1972-07-01), Trachtenberg
patent: 3779204 (1973-12-01), Altmann
patent: 3821938 (1974-07-01), Bacon et al.
patent: 3872825 (1975-03-01), Davidson

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