Measuring and testing – Dynamometers – Responsive to multiple loads or load components
Patent
1994-10-18
1996-05-14
Chilcot, Richard
Measuring and testing
Dynamometers
Responsive to multiple loads or load components
73862626, 310338, G01L 500
Patent
active
055157386
ABSTRACT:
An active matrix surface pressure input panel comprises a piezoelectric sheet having electrode lines formed thereon and coupled to a piezoelectric body for vibrating the sheet at a given reference frequency. When an object having surface variations, such as a fingertip, is pressed against the sheet, corresponding underlying portions of the sheet vibrate at frequencies that differ from the reference frequency. The local vibration frequencies are detected by electrode lines applied to opposing sides of the sheet, preferably in an X-Y grid, so that the relative locations of the sheet from where the detected signals emanate can be determined. The surface pressure input panel exhibits high definition over a relatively large detection area so that complicated surfaces, such as fingerprints, can be accurately detected and reproduced.
REFERENCES:
patent: 4356422 (1982-10-01), van Maannen
patent: 4634917 (1987-01-01), Dvorsky et al.
patent: 4644801 (1987-02-01), Kastanovich
patent: 4703663 (1987-11-01), Oppermann
patent: 5209126 (1993-05-01), Grahn
Patent Abstracts of Japan, vol. 17, No. 384 (P-1575) Jul. 19, 1993 & JP-A--5 061 966 (Matsushita Electric Ind) Mar. 12, 1993, Abstract.
Biegel Ronald L.
Chilcot Richard
Enix Corporation
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