Abstract There is disclosed a photoelectrophoretic imaging system wherein the imaging suspension utilized contains a photomigratory pigment dispersed in an insulating carrier liquid. The imaging suspension contains a vitamin precursor, beta carotene, in conjunction with the other components of the vehicle. The suspension is interpositioned between at least two electrodes and subjected to a potential difference while substantially simultaneously being selectively exposed to a reproducible image by a source of electromagnetic radiation. As a result of the suspension of the present invention it is now possible by regulating the polarities of the electrodes in the system to produce both negative and positive images from a single sense input.
Inventors
👤 Raymond L Jelfo
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-26 03:52
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
29 words
The process as disclosed in claim 1 wherein said beta carotene is present in an amount from about 0.0025 to about 1.0 gram per gram of said photosensitive pigment.
Claim 2
Independent Claim
118 words
A method of photoelectrophoretic imaging comprising applying a layer of an imaging suspension to the surface of a first electrode, said suspension comprising a plurality of photoelectrophoretic imaging particles in an insulating carrier liquid each of said particles comprising an electrically photosensitive pigment which is both the primary electrically photosensitive ingredient and the primary colorant for said particle, said suspension further including beta carotene, said first electrode being at least partially transparent to electromagnetic radiation, contacting said suspension with a second electrode, applying an electric field across said suspension between said electrodes and substantially simultaneously exposing said suspension to an image through said transparent first electrode with a source of activating electromagnetic radiation whereby an image is formed.
Claim 3
Dependent Claim
30 words
The process as disclosed in claim 4 wherein said beta carotene is present in an amount ranging from about 0.0025 to about 1.0 gram per gram of said photosensitive pigment.