Uniform charge device with reduced edge effects
AssigneeXerox Corporation
InventorsSatchidanand Mishra, Edward A. Domm, Dennis J. Prosser, Steven P. Nonkes, Zoran D. Popovic, Surendar Jevadev
Life of this patent
Estimating the term…
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.
Claims23
A corona producing device comprising:
- corona producing elements arranged in at least one group;
- the elements being directed at and spaced from a charge retentive surface;
- the elements further being 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 corona producing element profile determination method comprising
- determining the electrical potential in space;
- determining the spatial variation of the field;
- determining the potential in space comprising determining an electrical potential at points throughout a region between a charge-producing array of the corona producing elements and a photoreceptor of a marking machine.
A method of substantially uniformly charging a charge retentive surface comprising:
- attaching corona charging elements to a power source;
- determining a respective electric field distribution over the corona charging elements;
- if the respective electric field is substantially non-uniform, adjusting corona charging elements;
- and
- repeating the determining and adjusting until the electric field is substantially uniform.
Dependencies are inferred from the claim text.