Uniform charge device with reduced edge effects
AssigneeXerox Corporation
InventorsSatchidanand Mishra, Edward A. Domm, Dennis J. Prosser, Steven P. Nonkes, Zoran D. Popovic
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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.
Claims27
A corona producing device comprising:
- at least one plurality of corona producing elements directed at and spaced from a charge retentive surface and arranged in a profile that reduces shielding effects;
- a power source connected to the at least one plurality of corona producing elements;
- and
- supports to which the at least one plurality of corona producing elements are attached.
A charging apparatus in the form of a corona producing device and including a plurality of elements projecting toward a charge retentive surface, elements toward a center of the plurality of elements projecting further toward the charge retentive surface than elements toward edges of the plurality of elements, at least one element at the center projecting most toward the charge retentive surface, and elements at the edges projecting least toward the charge retentive surface.
A method of substantially uniformly charging a charge retentive surface comprising:
- attaching at least one plurality of corona charging elements to a power source;
- determining a respective electric field distribution over each plurality of the at least one plurality of corona charging elements;
- if the respective electric field is substantially non-uniform, adjusting the elements of the respective at least one plurality of corona charging elements;
- and
- repeating the determining and adjusting until each respective electric field is substantially uniform.
Dependencies are inferred from the claim text.