Browse Prior Art Database

Variable Resistance

IP.com Disclosure Number: IPCOM000096927D
Original Publication Date: 1962-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Scott, TR: AUTHOR

Abstract

The electrically variable resistance comprises two coaxially disposed cylindrical resistance elements. Outer element H has a thickness sufficient to provide mechanical stability for the device, e.g., about .020 inches. It is formed of a high resistance material, such as ferrite core or carbon. Inner element L has a low resistance and is formed by plating copper on H to a thickness approximating. 003-.005 inches. A control winding, which is insulated from the resistance elements, is passed within L, and a tab is attached at each end of both resistance elements.

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Variable Resistance

The electrically variable resistance comprises two coaxially disposed cylindrical resistance elements. Outer element H has a thickness sufficient to provide mechanical stability for the device, e.g., about .020 inches. It is formed of a high resistance material, such as ferrite core or carbon.

Inner element L has a low resistance and is formed by plating copper on H to a thickness approximating. 003-.005 inches. A control winding, which is insulated from the resistance elements, is passed within L, and a tab is attached at each end of both resistance elements.

Under normal conditions, the two resistance elements are connected in parallel to a circuit connected to the two tabs. When current flows through the control winding, a magnetic field is established about this winding causing a force to act on the electrons flowing in the resistance elements. This force is greatest near the control winding and causes the electrons to be forced from L to H, effectively varying the resistance across the two tabs.

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