Corona discharge device for electrophotographic charging and potential leveling
AssigneeHewlett-Packard Company
InventorsThomas Camis, Paul R. Spencer, Erwin H. Schwiebert, Robert R. Hay
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Abstract
A corona discharge device for electrophotographic printing is provided in which erasing and primary charging functions are performed by a single device. A screened charging arrangement is used for ion steering, while simultaneous illumination by light produces charge carriers in the photoconducting layer of the drum. In one embodiment, a photochemically etched stainless steel screen is used.
Claims5
A corona discharge device for simultaneous potential leveling and uniform primary charging to a desired drum potential of a rotating photoreceptor drum of an electro-photographic printing device comprising:
- a shield;
- a plurality of corona wires within the shield, all of the corona wires being connected to receive a positive d.c. voltage, for producing positive ions;
- a screen mounted on the shield for steering said positive ions toward said photoreceptor drum for charging said photoreceptor drum, the screen and the shield being maintained at a potential below the desired drum potential;
- and
- a continuously illuminating light source for illuminating a first portion of said photoreceptor drum while said first portion of said photoreceptor drum is being charged by said positive ions.
Dependencies are inferred from the claim text.