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Conical Ink Jet Orifices to Control Surface Wetting of Silicon Nozzle Plates

IP.com Disclosure Number: IPCOM000044926D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Masters, B: AUTHOR [+3]

Abstract

An ink jet printing head is described which has the surface area immediately surrounding the nozzles etched away to prevent extended wetting of the surface of the nozzle plate.

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Conical Ink Jet Orifices to Control Surface Wetting of Silicon Nozzle Plates

An ink jet printing head is described which has the surface area immediately surrounding the nozzles etched away to prevent extended wetting of the surface of the nozzle plate.

The printing head is formed in a suitable substrate 10, such as silicon. A nozzle 12 is etched in the substrate by the use of selective masking and anisotropic etching techniques, as is known in the art. Once the nozzles have been formed, a second etching operation is used to form a well 14 surrounding the nozzle. The resulting nozzle geometry restricts wetting of the nozzle to the narrow ledge 16 surrounding the nozzle. The high surface energy at the edge of this lip will confine the ink to the region 18, as shown.

Any ink which does travel over the lip will collect in the well surrounding the cone structure 20 and can be removed far away from the nozzle itself.

The technique is also applicable to the fabrication of an array of nozzles, as shown in the bottom view.

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