Xerox Corporation

Surendar Jeyadev

Markus Rudolf Silvestri

Dale S Renfer

Merlin E Scharfe

James M Markovics

Edward A Domm

Damodar M Pai

Aaron Michael Burry

Satchidanand Mishra

Robert C U Yu

William W Limburg

Palghat Srinivas Ramesh

David H Pan

Kenny-Tuan Dinh

Zoran D Popovic

Eric Scott Hamby

Richard L Schank

Vladimir Kozitsky

Nancy Lynn Belknap

Johann Junginger

Gary Walker Skinner

Gary Allan Batt

M John Hinckel

Mario Errico

Martin John Hinckel

Charles Hubert Henry Howes

Described herein is a device that generates a beam of light with uniform intensity. The device includes an array of light sources. The light generated passes through a beam splitter. One beam is used for feedback to maintain uniform intensity. The other beam passes through a barrel which is used to mold the beam with uniform intensity into the desired shape and to reduce divergence. The device can be used as part of a quality control system for testing a photoreceptor drum.

Device for uniform light intensity generation

This disclosure provides methods and systems for troubleshooting charging and photoreceptor failure modes associated with a xerographic process. Specifically, according to an exemplary method the photoreceptor decay behavior, with and without the effects of depletion, are quantified and used to determine a performance state of one or more of the charging stations and the photoreceptor surface.

Method and system for troubleshooting charging and photoreceptor failure modes associated with a xerographic process

The amount of lateral charge migration (LCM) on a photoreceptor is quantified by measuring the average potential of a latent image formed on the photoreceptor surface. The surface is first uniformly charged, then exposed a first time to an image. After a waiting period during which LCM may occur, the surface is exposed a second time to the image. After another waiting period, the average potential is measured. The amount of LCM may be quantified by varying the waiting periods.

Method for detecting lateral surface charge migration through double exposure averaging

A method for detecting charge defect spots (CDSs) on a chargeable surface is provided, including charging the chargeable surface to receive and hold a first voltage charge, spacing a surface of a scanner probe a distance from the chargeable surface, the scanner probe having a diameter, and biasing the scanner probe to a second voltage charge within a predetermined voltage threshold of the first voltage charge, wherein a parallel plate capacitor is established with the chargeable surface and a dielectric substance between the scanner probe and the chargeable surface. The method further includes reading with the scanner probe potentials associated with charges induced from the applied charges and any CDSs on the chargeable surface, including sensing the potentials and generating a signal corresponding to the sensing, applying a reference charge to the chargeable surface, and determining the potential of a CDS on the chargeable surface based on the scanner probe readings and at least one of the applied charges, which includes correcting for non-uniform charge distribution caused by a point-like nature of the CDS on the chargeable surface.

Contactless system and method for detecting defective points on a chargeable surface

A method for determining the approximate surface conductivity of a photoreceptor surface. The method involves forming a latent image of a series of lines of different widths on the surface, developing the image, and then printing the image. Based on which lines print, the surface conductivity can be computed once the developability of isolated lines is established through a calibration procedure.

Effective surface resistivity through image analysis

A crack resistant, curl-free electrophotographic imaging member includes a charge transport layer comprising an active charge transporting polymeric tetraaryl-substituted biphenyidiamine and a plasticizer.

Crack-resistant and curl free multilayer electrophotographic imaging member

An electrophotographic printing machine has a photoreceptive member. The photoreceptive member is charged and then exposed with a light image representation to form a latent image. An electric field, less than that required to re-charge the photoreceptive member, is applied to the latent image to increase the rate of discharge of the exposed portions of the latent image. The latent image is then developed.

Discharge of photoreceptors

Growing community of inventors

Rochester, NY, United States of America

Surendar Jeyadev