Xerox Corporation

P Keith Watson

Ian D Morrison

Melvin D Croucher

Henry R Till

Richard V LaDonna

Paul J Cressman

Lawrence J Fraser

Howard M Stark

In an electrophotographic printing machine, a layer of insulating fluid containing micelles is positioned over a photoreceptor. The micelles are migrated onto the surface of the photoreceptor. The photoreceptor is exposed to inject charge carriers into the insulating fluid and selectively neutralize micelles to form an electrostatic latent image. The latent image is transferred to a dielectric surface and developed.

Photo injection electrographic imaging

An apparatus for developing a latent image recorded on an imaging surface, comprising a housing defining a chamber storing a supply of developer material comprising toner a porous toner donor member spaced from the surface and being adapted to transport toner to a region opposed from the imaging surface; and means for conveying said developer material in the chamber of said housing onto said donor member.

Fluidized toner development using a rigid porous donor roll

Disclosed is a process for forming images which comprises applying a curable liquid to a first substrate in an image pattern, optionally transferring the curable liquid image to a second substrate, subsequently contacting the curable liquid image with a solid developer so that the developer adheres to the curable liquid image, optionally transferring the curable liquid and the solid developer in image pattern to a third substrate, and curing the curable liquid in the image pattern to a solid.

Curable strip-out development processes

A process for generating two-color images comprising: (1) charging an imaging member in an imaging apparatus; (2) creating on the member a latent image comprising areas of high, intermediate, and low potential; (3) providing an electrode having a potential within about 100 volts of that of the intermediate potential, enabling generation of an electric field and a developement zone between the imaging member and the electrode; and (4) developing the latent image by introducing into the development zone a liquid developer composition containing first toner particles of one color and second toner particles of another color, the particles being dispersed in a liquid medium, wherein the second toner particles are attached to the high potential and the first toner particles are attracted to the low potential. Another embodiment of the invention resides in a process for generating two-color images, comprising: (1) creating on an imaging member in an imaging apparatus a latent image comprising areas of positive, negative, and substantially no potential; (2) providing an electrode having a potential within about 100 volts of that of the area of substantially no potential, enabling the generation of an electric field and a development zone between the electrode and the imaging member; and (3) developing the latent image by introducing into the development zone a liquid developer composition containing first toner particles of one color and second toner particles of another color, the particles being dispersed in a liquid medium, wherein the second toner particles are attracted to the positive potential and the first toner particles are attracted to the negative potential.

Electrophotographic process for generating two-color images using liquid

An imaging process which comprises the formation of an image on an imaging member; subsequently developing the aforementioned image with an electrophoretic liquid developer composition comprised of an insulating suspending fluid with a resistivity of from about 10.sup.12 ohm-cm to about 10.sup.16 ohm-cm, pigment particles, a stabilizer component, and a charge control additive; and wherein the resulting ink has a resistivity of from about 10.sup.9 to about 10.sup.12 ohm-cm; applying the ink composition from an applicator roll, which roll transports the ink to the imaging member surface; and wherein the ink is attracted to the charged areas of the imaging member.

Electrophotographic and electrographic imaging processes

An automatic development control for use in an electrophotographic apparatus. The control includes a pair of substantially planar members forming a channel therebetween through which developer flows. One of the members is constructed such that an electrostatic charge pattern is periodically formed on the surface thereof, the charge pattern being developed by the attraction of toner thereto which toner has a charge opposite to that forming the charge pattern. The member on which the developed charge pattern is formed includes a uniform, transparent conducting substrate covered with a transparent insulating layer on top of which is deposited a set of spaced-apart, opaque and electrically conducting fingers. Thus, the one member includes alternate opaque and transparent areas. By grounding the electrically conducting fingers which are all interconnected and by driving the substrate alternately positive and negative, toner is deposited on the transparent areas during the application of one half cycle of voltage and during the following half cycle the toner is deposited on the opaque fingers and scavenged from the transparent areas. The optical density of the toner deposited is directly related to the toner concentration in the developer. The one member then forms part of the toner concentration control.

Automatic development control

An improved photoelectrophoretic imaging method is disclosed wherein a blocking layer is provided with a coating which interacts, in the dark, with the pigment particles of the imaging suspension so as to provide a uniformly charged imaging suspension upon exposure of the suspension to an electric field. The coating material occupies at least a substantially equal position in the Dark Charge Injection Series as any pigment in the imaging suspension. Subsequent or simultaneous electromagnetic radiation to which at least some of the particles are sensitive then results in the formation of optically positive and negative images.

Photoelectrophoresis with dark charge injecting element

An improved photoelectrophoretic imaging method is disclosed wherein the imaging suspension is brought into contact under a first electrical field with a blocking layer having a coating which interacts, in the dark, with the pigment particles of the imaging suspension so as to provide a uniformly charged imaging suspension. The imaging suspension is then exposed to appropriate electromagnetic radiation while under a second electrical field. A second blocking layer, free of said coating is employed to produce positive and negative images.

Growing community of inventors

Rochester, NY, United States of America

P Keith Watson