Uniform charge device with reduced edge effects

Electricity: electrical systems and devices – Discharging or preventing accumulation of electric charge – Specific conduction means or dissipator

Reexamination Certificate

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Reexamination Certificate

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10721847

ABSTRACT:
By varying corona producing element height/projection, a more uniform charge potential is achieved. Elements, such as pins or teeth, are shorter at the edges of an element array and grow longer as one moves toward the center of the array. Such variation in height/projection overcomes shielding from adjacent teeth, as well as other effects, to yield the more uniform charging potential.

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“The Negative Corona Current Distribution for a Long Pin-to-Plane Geometry,” P.J. Walsh, et al,Photographic Science and Engineering, vol. 28, No. 3, May/Jun. 1984, pp. 101-108.

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