Browse Prior Art Database

Photo-induced Jump Development

IP.com Disclosure Number: IPCOM000122342D
Original Publication Date: 1991-Nov-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 48K

Publishing Venue

IBM

Related People

Diaz, AF: AUTHOR [+2]

Abstract

For color printing in electrophotographic and electrostatic processes, a noncontact image development process is required to prevent contamination of one color toner by the development process of a second color toner. Noncontact, noncontamination development of an electrostatic charge pattern on a photoconductor or dielectric surface is accomplished using photo-induced jump transfer development. In this process a cyan, magenta, or yellow photoconductive toner is deposited in one or multiple layers on a developer roll. The developer roll is in spaced relation to the aforementioned photoconductor or dielectric surface and is capable of sustaining a bias AC or DC voltage relative to the photoconductor ground plane.

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This is the abbreviated version, containing approximately 100% of the total text.

Photo-induced Jump Development

      For color printing in electrophotographic and electrostatic
processes, a noncontact image development process is required to
prevent contamination of one color toner by the development process
of a second color toner.  Noncontact, noncontamination development of
an electrostatic charge pattern on a photoconductor or dielectric
surface is accomplished using photo-induced jump transfer
development. In this process a cyan, magenta, or yellow
photoconductive toner is deposited in one or multiple layers on a
developer roll.  The developer roll is in spaced relation to the
aforementioned photoconductor or dielectric surface and is capable of
sustaining a bias AC or DC voltage relative to the photoconductor
ground plane.  An exposure lamp with a filter selected to selectively
expose the cyan, magenta, or yellow toner exposes the selected
photoconductive toner just prior to or when positioning it opposite
the charge pattern corresponding to the desired color on the
photoconductor/ dielectric surface whereupon its charge pattern
induces a mirror pattern of attractive charges on the photoconductive
toner and it jumps across the gap to the patterned region.

      The figure shows the basic structure of the non-contact
developing unit for photoconductive toner.

      Disclosed anonymously.