Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1986-04-03
1988-02-23
Miller, Stanley D.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324104, G02F 1133, G01R 1700
Patent
active
047266619
ABSTRACT:
A device for testing a battery, particularly a small, "button-type" battery, such as those used in hearing aids, calculators, watches and the like, comprising a flexible, transparent substrate on which is deposited a conductive material, which may taper outwardly in opposite directions or in a single direction, from a central point from one side to a pair of outer terminals. A layer of a cholesteric liquid crystal material is then deposited on the substrate. A layer or band of a black light absorbing material the opposite side from the black absorber layer. The conductive material is an epoxy cement-based conductor, preferably silver, printed or painted directly on to the substrate. An indicator scale is located along sections of the tapered conductive material. To test a dry cell battery, the terminal ends of the conductive material are placed in contact with the battery terminals, causing a current to flow which heats the conductive material, the heat generated being the most intense at the central point and radiating outwardly. The heat is transferred through the thin substrate to the liquid crystal layer which results in a color change in the liquid crystal. The traverse of the color change along the length of the indicator scale, outwardly from the center point, is proportional to the current or voltage output or the condition of the battery to be tested and can be read on the indicator scale which is calibrated accordingly.
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Wargin et al., "A Large, Flexible, Liquid Crystal Display Cell", IEEE Conference of 1972, Conference on Display Devices, N.Y., USA, 11-12 Oct. 1972.
Lewis David
Miller Stanley D.
Rajender Shyamala T.
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