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Variable Resistor Element

IP.com Disclosure Number: IPCOM000097880D
Original Publication Date: 1961-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Hildebrand, JO: AUTHOR [+2]

Abstract

The two variable resistive elements each have a nonconducting substrate 1, a resistive layer 2, a photoconductive layer 3, and a conductive layer 4. In the lower device, layers 3 and 3 are light transmitting. A beam of light impinging on layer 3 reduces the resistance of the layer at this point to establish electrical contact between layers 2 and 4. These elements are used either as rheostats or potentiometers. The upper device is a rheostat and the lower device is a potentiometer.

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Variable Resistor Element

The two variable resistive elements each have a nonconducting substrate 1, a resistive layer 2, a photoconductive layer 3, and a conductive layer 4. In the lower device, layers 3 and 3 are light transmitting. A beam of light impinging on layer 3 reduces the resistance of the layer at this point to establish electrical contact between layers 2 and 4. These elements are used either as rheostats or potentiometers. The upper device is a rheostat and the lower device is a potentiometer.

Typically, layer 1 is glass or a phenolic resin and layer 2 is a carbon resistor material or a closely spaced wire wound resistor. Layer 3 is CdS or CdSe for low resistive elements and Se for higher resistive elements. Layer 4 is an evaporated layer of a noble metal or a painted silver electrode layer.

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