Development method and apparatus
AssigneeXerox Corporation
InventorRobert W. Gundlach
Life of this patent
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Abstract
In the development of nonuniform latent images on an imaging member, wherein xerographic polar or polarizable toner particles are employed, it is desirable to utilize a development system that will bring the polar or polarizable toner into contact with the latent image without triboelectrically charging the particles and permitting use of nonmagnetic particles when the image is electrostatic and without demagnetizing the latent image when it is magnetic. To achieve this aim, a dielectric brush having convergent electrostatic fields is disclosed and claimed.
Claims22
In an apparatus employing polar or polarizable toner particles for the development of a nonuniform electrostatic or magnetic latent image a development means comprising a cylindrical insulating member and concentric with and within said insulating cylinder a means for establishing convergent fields around the outer surface of said cylindrical insulating member;
- said means and said insulating cylinder being rotatable with respect to each other.
A method of developing a nonuniform electrostatic or magnetic latent image on an imaging member which comprises contacting a source of polar or polarizable toner particles with an insulating roll, establishing a multiplicity of convergent electrical fields having lines of force that pass through said insulating roll to hold said toner particles to the external surface thereof, causing said multiplicity of convergent fields to rotate with respect to said insulating roll to thereby transport said toner particles from said source to said nonuniform latent image, said toner particles exhibiting paramagnetic properties when said nonuniform latent image is magnetic.
An apparatus for making a copy of an original document comprising a means for imparting to an imaging member a nonuniform latent image, a development means for rendering visible said latent image, said development means comprising a cylindrical insulating member and concentric with and within said insulating cylinder a means for establishing convergent fields arond the outer surface of said cylindrical insulating member;
- said means and said insulating cylinder being rotatable with respect to each other, a transfer means to transfer the toner in image configuration to a support member, a means for fixing the toner to the support member, and a means for cleaning the imaging member.
Dependencies are inferred from the claim text.