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Control of Aluminum Film Properties in Electroerosion Recording Media

IP.com Disclosure Number: IPCOM000039055D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Afzali-Ardakani, A: AUTHOR [+4]

Abstract

Electroerosion printing is a technique in which recording styli are used to erode patterns in a thin metal film (Al) in an electroerosion medium. By doing so, portions of the medium can be rendered light- transparent in an opaque background (direct negative uses), or portions of the medium can be created which will retain information (direct master uses). Two parameters are relevant in the control of the properties of the metallization layer (Al) of the direct-negative/direct-master. The first is the optical density, which is directly proportional to the mass of metal per unit area, and is in itself of primary interest for the direct negative. The second is the sheet resistivity, measured in ohm/square.

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Control of Aluminum Film Properties in Electroerosion Recording Media

Electroerosion printing is a technique in which recording styli are used to erode patterns in a thin metal film (Al) in an electroerosion medium. By doing so, portions of the medium can be rendered light- transparent in an opaque background (direct negative uses), or portions of the medium can be created which will retain information (direct master uses). Two parameters are relevant in the control of the properties of the metallization layer (Al) of the direct- negative/direct-master. The first is the optical density, which is directly proportional to the mass of metal per unit area, and is in itself of primary interest for the direct negative. The second is the sheet resistivity, measured in ohm/square. Unfortunately, these parameters are not independently controllable and are approximately inversely proportional to each other. With conventional Al deposition, Al films of suitable optical density often have resistivities which are too low. The optical density must be carefully controlled since a value which is too low will permit light to pass through background (nonimage) areas during exposure of the photosensitive master through the direct negative. If the optical density is too high, the mass density of the metal will be so high that difficulty will be encountered in selectively removing it by the electro-erosion process. The resistivity of the aluminum film should not be too low since it c...