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Rounding Ink Jet Nozzles

IP.com Disclosure Number: IPCOM000086959D
Original Publication Date: 1976-Nov-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Cuomo, JJ: AUTHOR [+2]

Abstract

Rectangular holes 2 etched along crystallographic planes in a silicon substrate 4 are useful in ink jet nozzle formation for nonimpact printing (Fig. 1A). The inherent higher surface energy of a rectangular structure over a circular structure makes the latter more desirable from the erosion and wear point of view.

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Rounding Ink Jet Nozzles

Rectangular holes 2 etched along crystallographic planes in a silicon substrate 4 are useful in ink jet nozzle formation for nonimpact printing (Fig. 1A). The inherent higher surface energy of a rectangular structure over a circular structure makes the latter more desirable from the erosion and wear point of view.

A low temperature process for producing rounded holes from rectangular ones is to fabricate low melting point eutectics on the surface of the hole. Due to surface tension and a tendency towards a minimum in surface area, the hole 2' (Fig. 1B) will become circular when the eutectic forms. This effect was found when gold was deposited over the silicon holes near or above the eutectic temperature. The same effect can be seen by first depositing the eutectic- forming material below the eutectic temperature with a subsequent heat treatment above the eutectic temperature producing rounded holes. Other eutectic-forming material can be used in place of the gold, e.g., Ag, Pt, Al and Ga.

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