Photocopying – Contact printing – Light boxes
Patent
1990-07-02
1991-04-09
Grimley, A. T.
Photocopying
Contact printing
Light boxes
118653, 118690, 355208, G03G 2100
Patent
active
050068970
ABSTRACT:
In electrostatographic apparatus, the ratio of toner particle electrostatic charge-to-toner particle mass and the development rate are determined by providing a piezo device positioned to interact with toner particles. The device is periodically electrically biased to attract toner particles, and the frequency shift of the piezo device due to the mass of attracted toner particles is detected. The electrostatic charge buildup on the electrode due to the attracted toner particles is detected to determine the mass of toner. The potential on the device may be changed periodically from a potential which attracts toner to a potential which repels toner to clean the device.
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Laukaitis Joseph F.
Primerano Bruno
Rimai Donald S.
Zaretsky Mark
Beatty Robert
Eastman Kodak Company
Grimley A. T.
Sales Milton S.
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