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Fabrication of Coated Plane with Perturbation Free Edges

IP.com Disclosure Number: IPCOM000094026D
Original Publication Date: 1966-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Raacke, KH: AUTHOR

Abstract

This coating method enables a single, thick layer of insulating material to be applied uniformly over the entire surface of a planar substrate. Such is effected without producing any perturbations due to surface tension effects at the edges of the layer.

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Fabrication of Coated Plane with Perturbation Free Edges

This coating method enables a single, thick layer of insulating material to be applied uniformly over the entire surface of a planar substrate. Such is effected without producing any perturbations due to surface tension effects at the edges of the layer.

Ordinarily when a film of liquid insulating material having a substantial depth is applied to the entire surface of a substrate, it tends to have greater thickness at the edges of the substrate than at its center. This is due to the effect of surface tension upon those portions of the liquid that attempt to overrun the edges of the supporting surface. Without the attraction of a continuous supporting surface, the edges of the liquid film are contracted by surface tension, causing an accumulation of the liquid to a greater depth near the termination of the supporting surface. Perturbations of the insulating film caused by these thickened edge accumulations are detrimental to the fabrication of magnetic film memories. This is because they increase the difficulty of making good electrical interconnections between memory planes.

By using this method, there is applied to a planar substrate a single thick coating of liquid insulating material. The latter uniformly covers the entire substrate surface without any tendency to increase its depth at any point due to surface tension. Before it is coated, the substrate is placed in a closely fitting frame or jig which p...