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US 7,734,204 B2Granted
System and methods for reducing ghosting
AssigneeXerox Corporation
InventorJoseph H. Rowe
Life of this patent
Estimating the term…
Abstract
The presently disclosed embodiments are directed to imaging members useful in electrostatography. More particularly, the embodiments pertain to an improved development systems for electrophotographic imaging and printing apparatuses and machines in which ghosting print defects are reduced, and more particularly, is directed to a method for reducing positive ghosting in such systems.
Claims19
A method for developing a latent image on an imaging surface, comprising:
- charging an imaging surface, further comprising
- charging the imaging surface to a high voltage to accelerate removal of hole electron pairs, wherein the imaging surface is charged to the high voltage for a first portion of rotation, the first portion of rotation being about 60 degrees of rotation,
- reducing surface voltage of the imaging surface to a low voltage to neutralize surface charge of the imaging surface, and
- charging the imaging surface to a target voltage to produce uniformity of the surface charge;
- exposing the imaging surface to an image to form an electrostatic latent image;
- forming a toner image with a toner-containing developer by developing the electrostatic latent image on the imaging surface;
- and
- transferring the toner image to a transfer substrate, wherein obtaining uniform surface charge on the imaging surface substantially reduces ghosting print defect.
5 more elements
A method for developing a latent image on an imaging surface, comprising:
- charging an imaging surface, further comprising
- charging the imaging surface to about 1000 volts or more for a first portion of rotation to accelerate removal of hole electron pairs,
- reducing surface voltage of the imaging surface to from about 500 volts to about 550 volts for a second portion of rotation to neutralize surface charge of the imaging surface, and
- charging the imaging surface to about 600 volts for a third portion of rotation to produce uniformity of the surface charge;
- exposing the imaging surface to an image to form an electrostatic latent image;
- forming a toner image with a toner-containing developer by developing the electrostatic latent image on the imaging surface;
- and
- transferring the toner image to a transfer substrate, wherein obtaining uniform surface charge on the imaging surface substantially reduces ghosting print defect.
5 more elements
A system for developing a latent image on an imaging surface, comprising:
- a charging unit for charging an imaging surface, the charging unit comprising
- a first scorotron or first corotron for charging the imaging surface to a high voltage for a first portion of rotation to accelerate removal of hole electron pairs,
- a second scorotron or a second corotron for reducing surface voltage of the imaging surface to a low voltage for a second portion of rotation to neutralize surface charge of the imaging surface, and
- a third scorotron or third corotron for charging the imaging surface to a target voltage for a third portion of rotation to produce uniformity of the surface charge;
- an exposing unit for exposing the imaging surface to an image to form an electrostatic latent image;
- a toner-containing developer for forming a toner image by developing the electrostatic latent image on the imaging surface;
- and
- a transferring unit for transferring the toner image to a transfer substrate, wherein obtaining uniform surface charge on the imaging surface substantially reduces ghosting print defect.
5 more elements
Dependencies are inferred from the claim text.