Method and apparatus for determining toner charge-to-mass ratio

Details Method and apparatus for determining toner charge-to-mass ratio Method and apparatus for determining toner charge-to-mass ratio

1992-06-12

1993-08-10

Braun, Fred L.

Photocopying

Contact printing

Light boxes

G03G 1508, G03G 2100

Patent

active

052353885

ABSTRACT:
A method and apparatus for determining the charge-to-mass ratio of electroscopic toner particles of the type used in electrostatographic recording to develop electrostatic images. The apparatus uses a biased electrode for attracting toner particles thereto, and a microprocessor-based logic and control unit for sampling the mass of toner particles deposited on the electrode after the deposited toner particles have neutralized the electric field produced by the electrode bias. This toner mass information, together with certain toner constants and known parameters, is used by the logic and control unit to calculate the toner's charge-to-mass ratio. The output of the apparatus is useful for controlling process parameters (e.g. primary charging and exposure levels, development electrode bias, toner concentration) which affect image quality.

REFERENCES:
patent: 4026643 (1977-05-01), Bergman
patent: 4447145 (1984-05-01), Snelling et al.
patent: 4987453 (1991-01-01), Laukaitis
patent: 5006897 (1991-04-01), Rimai et al.

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