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Conformable Wide Electrode Thermal Print Head

IP.com Disclosure Number: IPCOM000038340D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Crowe, JR: AUTHOR [+2]

Abstract

In resistive ribbon thermal transfer printing, the print head is comprised of many relatively narrow electrodes. However, when the printing speed is increased, a wider electrode (of the order of 80 micrometers) is preferable with the gap spacing between electrodes being about l0 micrometers. These wider electrodes make the head stiffer, which is a disadvantage. In order to overcome this, the print heads shown in Figs. l and 2 have wide electrodes which are split, thereby enabling the head to regain its conformability. The electrodes are typically comprised of tungsten which can be etched by reactive ion etching to provide a structure having wide electrodes and narrow gaps in the thick (25 micrometers) tungsten sheet. Fig. l shows a portion of a print head having wide electrodes l0, l2 separated by a narrow gap l4.

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Conformable Wide Electrode Thermal Print Head

In resistive ribbon thermal transfer printing, the print head is comprised of many relatively narrow electrodes. However, when the printing speed is increased, a wider electrode (of the order of 80 micrometers) is preferable with the gap spacing between electrodes being about l0 micrometers. These wider electrodes make the head stiffer, which is a disadvantage. In order to overcome this, the print heads shown in Figs. l and 2 have wide electrodes which are split, thereby enabling the head to regain its conformability. The electrodes are typically comprised of tungsten which can be etched by reactive ion etching to provide a structure having wide electrodes and narrow gaps in the thick (25 micrometers) tungsten sheet. Fig. l shows a portion of a print head having wide electrodes l0, l2 separated by a narrow gap l4. Each electrode has a single slit l6 therein to make the structure conformable. More than one slit can be etched into each electrode, as shown in Fig. 2, where a wide electrode l8 has two slits 20 therein. The electrode slits can be etched at the same time the rest of the head is etched. By using a metal mask, it is possible to etch the slits in the order of 5 micrometers width.

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