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Universal RuO(2) Based Printhead for Multiple Technology Printing

IP.com Disclosure Number: IPCOM000050212D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 33K

Publishing Venue

IBM

Related People

Kuntzleman, H: AUTHOR [+4]

Abstract

The basic problems of all thin film and also bulk or thick layer thermal heads as well as other impact and non-impact heads are (a) mechanical wear and (b) corrosion.

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Universal RuO(2) Based Printhead for Multiple Technology Printing

The basic problems of all thin film and also bulk or thick layer thermal heads as well as other impact and non-impact heads are (a) mechanical wear and (b) corrosion.

It is well known that even in non-impact printing, such as chemical printing, thermal printing, electroerosion, or resistive ribbon, the head must come in direct contact with the print medium and undergoes friction wear. The problem is especially serious in thermal heads where, in order to transfer the heat efficiently, the abrasion on the head is considerable. The problem is compounded by the abrasion characteristics of dry paper and by the pressure of the printhead against paper.

The erosion and corrosion resistance properties of RuO(2) are known. We propose a structural modular RuO(2) -based printhead which has the following characteristics: a) The structure is co-axial, with the center core (A) being RuO(2) or a highly conductive RuO(2) compound, or some other very conductive, unwearable compound. b) Each RuO(2) -based print element (A) is surrounded by a modular ring (B). The nature of the modular ring (its composition and resistivity) determines the printhead functions and its characteristics. c) The rest of the printhead surface (C) is made of the same materials as (A) and is electronically addressed with opposite polarity to (A) Structure for Chemical Printing

(A) is pure RuO(2) or RuO(2) compound (RuO(2) + high corrosion resistance glass) of high conductivity, (C) is the same material as (A), or it can also be a highly conductive layer of another material (stainless steel, etc.). The modular layer (B) is an insulator (pure glass, high temperature boron oxide glass, A1(2)0(3), etc.).

When a voltage pulse is applied between (A) (+) and (C) (-), as the paper is moist and conductive, a current flows across layer C (2-4 mils), producing a change in color under (A) due to oxidation of a leucodye contained on the paper surface. Structure for Thermal Head

The head structure is the same as above with (A) and (C), but layer (B) is a semiconductor (a mixture of...