Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

LOW VOLTAGE DIPOLE DEVELOPMENT APPARATUS

IP.com Disclosure Number: IPCOM000025685D
Original Publication Date: 1987-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 95K

Publishing Venue

Xerox Disclosure Journal

Abstract

The concept of dipole development in which uncharged toner particles are attracted to an electrostatic image by virtue of its fringe field gradients has been described in U.S. One technique for carrying out this development is to manually flood the image with toner and vacuum off the background. Still another technique is to use magnetic toner and a rotating magnetic which moves the toner from a sump through and out of the development zone.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 55% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

LOW VOLTAGE DIPOLE DEVELOP- MENT APPARATUS U.S. C1.355/3DD William L. Goffe

Proposed Classification

Int. C1. G03g 15/00

16

22

Volume 12 Number 2 March/April 1987

[This page contains 1 picture or other non-text object]

Page 2 of 2

LOW VOLTAGE DIPOLE DEVELOPMENT APPARATUS (Cont'd)

The concept of dipole development in which uncharged toner particles are attracted to an electrostatic image by virtue of its fringe field gradients has been described in U.S. Patent 4,185,916.

One technique for carrying out this development is to manually flood the image with toner and vacuum off the background. Still another technique is to use magnetic toner and a rotating magnetic which moves the toner from a sump through and out of the development zone.

The first technique provides considerably more sensitivity in that it develops at much lower image potentials. However, it has not been shown in mechanized form. Disclosed hereinbelow is a method of mechanized development in which sensitivities approach those of the manual flood and remove technique. This method is particularly important to developing well- screened, electrostatic images with potentials lower than those requireD for monopole development. For example, it is important to electrographic systems where image potentials are inherently limited by the writing process or process speed.

Basically, development is done with a single component, weak brush configuration in which toner forms a brush in a wea...