Electricity: measuring and testing – A material property using electrostatic phenomenon
Patent
1991-08-30
1993-03-02
Harvey, Jack B.
Electricity: measuring and testing
A material property using electrostatic phenomenon
324457, 324109, 355203, 358406, G01N 2760
Patent
active
051912937
ABSTRACT:
An electrostatic voltmeter adjacent to the surface of a photoreceptor belt or drum between, for example, the electrostatographic imaging station and developing station. A surface of the photoreceptor is charged at a charging station and the charged area is rotated and stopped adjacent to the electrostatic voltmeter. After a predetermined period of time, the surface potential of the charged area is measured by the voltmeter. Additional measurements can be made at subsequent times to determine a dark decay rate of the charged photoreceptor. Surface potentials at other areas adjacent the photoreceptor surface, such as in the development zone, can be determined based on the initial voltage applied to the photoreceptor surface at the charging station and the rate of dark decay. The invention allows for close monitoring/control of the surface potential at one or a plurality of development zones without the need for locating voltmeters within each development zone.
REFERENCES:
patent: 4326796 (1982-04-01), Champion et al.
patent: 4355885 (1982-10-01), Nagashima
patent: 4433297 (1984-02-01), Buchheit
patent: 4433298 (1984-02-01), Palm
patent: 5040021 (1991-08-01), Fowlkes
Brown Glenn W.
Harvey Jack B.
Xerox Corporation
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