Browse Prior Art Database

Etchant Control System

IP.com Disclosure Number: IPCOM000092827D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 84K

Publishing Venue

IBM

Related People

Setzer, A: AUTHOR [+2]

Abstract

To analyze the properties of an etchant bath, a continually moving conductive wire is passed through a sample receptacle of etchant liquid. It continues through a rinsing chamber and onto a contacting process to evaluate by comparison the resistance change in the wire due to the effect of the etchant liquid.

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Etchant Control System

To analyze the properties of an etchant bath, a continually moving conductive wire is passed through a sample receptacle of etchant liquid. It continues through a rinsing chamber and onto a contacting process to evaluate by comparison the resistance change in the wire due to the effect of the etchant liquid.

The components used to achieve this method consist of a supply roll SR of measuring wire. The latter is pulled by a friction drive over contact rolls up through an etchant filled reservoir. Here the wire diameter is diminished in a similar manner as the workpieces in the etching bath.

To prevent destruction of the measuring wire, it is directed to a water-filled rinsing chamber and over contact rolls to be terminated at takeup roll. The change in resistance is measured by contact brushes as the measuring wire passes over their respective contact rolls. Comparison readings can be obtained for supervising and controlling the etching speed and time.

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