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Browse Prior Art Database

BLACK ELECTROCHROMIC IMAGING

IP.com Disclosure Number: IPCOM000024564D
Original Publication Date: 1981-Feb-28
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 72K

Publishing Venue

Xerox Disclosure Journal

Abstract

A method of imaging using an electrochromic material produces a black image which may be formed on or transferred to a copy material. The method involves using an electrochromic material which comprises a solution in methanol of N, N' di(p-cyanopheny1) - 4, 4' bipyridylium dichloride, and passing electric currents in image configuration at a potential above a threshold potential for black coloration of the reduced electrochromic material. The electric current may conveniently be passed in two parts, the first comprising brief pulses at a potential above the coloration threshold, and the second comprising a DC potential less than the threshold potential.

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:EROX DISCLOSURE JOURNAL

BLACK ELECTROCHROMIC IMAGING

M. Hemming

Proposed Classification
U.S. Cl. 204/164
Int. C1. C07c 17/00

f

A method of imaging using an electrochromic material produces a black image which may be formed on or transferred to a copy material. The method involves using an electrochromic material which comprises a solution in methanol of N, N' di(p-cyanopheny1) - 4, 4' bipyridylium dichloride, and passing electric currents in image configuration at a potential above a threshold potential for black coloration of the reduced electrochromic material. The electric current may conveniently be passed in two parts, the first comprising brief pulses at a potential above the coloration threshold, and the second comprising a DC potential less than the threshold potential.

In an apparatus for putting the method into effect, the conductive imaging surface 1 of a drum 2 passes first through a writing station 3. Electrochromic solution 4 flows from a feed device 5, and styli 6 are energized by drive circuit 7. By selectively applying potentials above about 2.5 volts to the individual styii, a latent image of reduced electrochromic material is formed on surface 1. The latent image is developed at developing station 8, at which the surface 1 passes through an elecrrochromic solution 9. A DC bias is applied via circuit 10 to an electrode
11. This causes the latent image to become visible due to further deposition of reduced eiectrochromic material. Excess liquid...