PHOTOELECTROPHORETIC IMAGING PROCESS FOR FORMING IMAGES ON BLOCKING ELECTRODE OF THE SAME COLOR SENSE THE ORIGINAL

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed herein is a photoelectrophoretic imaging process wherein a fluid dispersion containing less than about 2 weight percent of electrically photosensitive pigment particles is positioned between an injecting electrode and a blocking electrode, and a field established therebetween so as to cause at least a major portion of the dispersed photosensitive pig~ ment particles to deposit upon the blocking electrode.

XEROX DISCLOSURE JOURNAL

~PHOTOELECTROPHORETIC IMAGING Proposed Classification
PROCESS FOR FORMING IM1~GES ON ~ U.S. CL. 96/1.5
BLOCKING ELECTRODE OF THE SP~ME mt. CL. G03g 5/04
COLOR SENSE 2~S THE ORIGIN2~L
Leonard M. Carreira

Disclosed herein is a photoelectrophoretic imaging process
wherein a fluid dispersion containing less than about 2 weight
percent of electrically photosensitive pigment particles is
positioned between an injecting electrode and a blocking
electrode, and a field established therebetween so as to cause
at least a major portion of the dispersed photosensitive pig~
ment particles to deposit upon the blocking electrode.

The deposition of these pigment particles on the blocking
electrode is accomplished by any one or combination of inde~
pendently operating processes. The simplest of these processes
involves the charging of these pigments either as an incident
to their suspension in the fluid or by charging them after
suspension in the fluid, The net charge imparted to the pig~
ment particles is, of course, opposite in sign to the charge
in the blocking electrode.

The other alternative methods for deposition of the pigment
particles of the photosensitive dispersion on the blocking
electrode involve the dark injection of charge into the pig~
ment particles from the injecting electrode or the dark in~
jection of charge from the injecting electrode into the fluid
dispersing medium and the subsequent transfer of the charge
from the fluid dispersing medium into the pigment...