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Printhead for Electrochromic Printing

IP.com Disclosure Number: IPCOM000051609D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Chai, HD: AUTHOR [+4]

Abstract

A printhead for electrochromic printing utilizes photofabrication techniques to form accurately spaced electrodes. Anodes and cathodes are formed by selectively etching a layer of conducting material, such as aluminum, that has been deposited on a substrate.

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Printhead for Electrochromic Printing

A printhead for electrochromic printing utilizes photofabrication techniques to form accurately spaced electrodes. Anodes and cathodes are formed by selectively etching a layer of conducting material, such as aluminum, that has been deposited on a substrate.

Referring to Fig. 1, a first substrate 10 is selectively etched using, for example, photolithographic techniques, to produce an array of conducting spots 12 on one surface that serve as printing anodes. Formed in the same operation are conducting rings 14 that surround the spots 12. The spots 12 are preferably arranged in a rectangular array, and the rings 14 are connected in parallel rows by connecting links 16. The spots 12 for adjacent rows may be staggered, for example, to achieve higher resolution. A second substrate 20 has a parallel arrangement of conducting ribbons 22 formed on one surface by photofabrication, the spacing of ribbons 22 corresponding to the spacing of the columns of spots 12.

Referring to Fig. 2, substrate 10 has apertures 30 formed at each spot 12. Substrate 10 is superposed on substrate 20 with apertures 30 aligned with and adjacent to ribbons 22. A conducting paste or other conducting material is added to fill each hole 30 to make an electrical connection between spots 12 and corresponding ribbons 22. Using such a technique, accurately placed electrodes of small geometry may be fabricated.

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