Precharging of the X-ray photoreceptor to eliminate the fatigue artifact
AssigneeXerox Corporation
InventorsWilliam D. Fender, Lothar S. Jeromin
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Abstract
A process modification for the development of x-ray electrophotographic images with selenium photoreceptors wherein the occurrence of a catastrophic spot producing artifact called fatigue is eliminated. The process change consists of the addition of a photoreceptor pre-charging step immediately after thermal relaxation and before insertion of the photoreceptor in the elevator where it may be subsequently discharged by a suitable light source within thirty seconds of the pre-charging step. The effectiveness of the pre-charging step is achieved through field assisted detrapping of interference defect site injected holes which would otherwise detrap in the image charging step, thereby producing the fatigue artifact.
Claims2
In a xerographic process comprising the steps of charging a xerographic selenium plate to a first voltage, exposing the plate to radiation, developing the plate with toner, transferring the toner image to the paper to create a copy, and cleaning the plate of toner before the next charging step, the additional steps between said cleaning step and said next charging step of:
- precharging said plate to a second voltage of the same polarity as said first voltage, and
- waiting at least thirty seconds to release any trapped charges in said plate.
Dependencies are inferred from the claim text.