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Two-Step Process for Etching Printheads

IP.com Disclosure Number: IPCOM000038487D
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

Lane, R: AUTHOR

Abstract

Using a double-sided chemical wet etch as the first step, and then using a single sided wet etch as the final step, is an effective process for making thermal printheads with wide electrodes. Fig. 1 shows etched trenches 1 in tungsten sheet 2 after the double-sided etch. The process starts with bare tungsten. Double- sided etching is done for the electrodes. First, the bare tungsten is dipped into photoresist, and then both faces are exposed with the wide electrode pattern. This is done in one step using a double-sided mask aligner. A double-sided wet spray etch is done. After the etching, the sheet of tungsten has many sets of electrodes etched in it. The resist is removed from both sides. Fig. 2 shows the resist pattern prior to the single-sided etch.

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Two-Step Process for Etching Printheads

Using a double-sided chemical wet etch as the first step, and then using a single sided wet etch as the final step, is an effective process for making thermal printheads with wide electrodes. Fig. 1 shows etched trenches 1 in tungsten sheet 2 after the double-sided etch. The process starts with bare tungsten. Double- sided etching is done for the electrodes. First, the bare tungsten is dipped into photoresist, and then both faces are exposed with the wide electrode pattern. This is done in one step using a double-sided mask aligner. A double- sided wet spray etch is done. After the etching, the sheet of tungsten has many sets of electrodes etched in it. The resist is removed from both sides. Fig. 2 shows the resist pattern prior to the single-sided etch. KAPTON* polyester film is laminated to one face of the etched tungsten sheet. Fresh resist is applied by dipping the sheet. The resist gets between the electrodes, protecting them during the etch. The rest of the head pattern is now formed in the resist; then a single sided etch is done. This results in a wet-etched printhead. * Trademark of
E. I. du Pont de Nemours & Co.

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