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United States Patent 5,150,759
Borchard Sept. 29, 1992

Capacitor-sensor

Inventors: Borchard; John S. (97-A Lowell Ave., Newton, MA 02160).
Appl. No.: 604,174
Filed: Oct. 29, 1990
Intl. Cl.: G01G 3/14; H01G 7/00; G01L 9/12; G01L 1/26;
U.S. Cl.: 177/210.C; 361/283.;
Field of Search: 210 C

References Cited

U.S. Patent Documents

4,064,550 Dec., 1977 Dias et al. 361/283
4,182,187 Jan., 1980 Hanson
4,207,604 Jun., 1980 Bell 361/283
4,679,643 Jul., 1987 Bove 177/210 C
4,705,127 Nov., 1987 Kunz
5,001,595 Mar., 1991 Dittrich et al. 361/283
5,006,952 Apr., 1991 Thomas 361/283
5,044,202 Sept., 1991 Southworth et al.
5,050,034 Sept., 1991 Hegner et al. 361/283

Primary Examiner: Miller, Jr.; George H.

Abstract

An improved capacitor-sensor formed between two rigid, closely-spaced and facing, first and second plates, each with a facing and nonfacing surface and with specific facing electrode patterns on the plates forming a plurality of capacitors sensitive to displacement between the plates, which will eliminate asymmetrical overlap patterns and horizontal motion sensitivity. The first and second plate electrode patterns each have three, equispaced, identical, circular conductive regions on their facing surfaces. The diameters of the first plate circular conductive regions are less than the diameters of the circular conductive regions of the second plate. Electrical leads and interconnections are so arranged that overlap between leads and interconnections on opposing plates is avoided.

30 Claims, 11 Drawing Figures

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