Capacitive sensing array device

Details Capacitive sensing array device Capacitive sensing array device

1997-07-18

1999-09-14

Noori, Max

Measuring and testing

Dynamometers

Responsive to force

73777, G01L 500

Patent

active

059525886

ABSTRACT:
A capacitive sensing array device, such as a fingerprint sensing device, includes an array of individual sensing electrodes (14) covered by a layer of insulating material (40) defining a sensing surface on which a person's finger is placed, each sensing electrode, its overlying fingerprint portion and intervening insulating layer providing a capacitance in operation. The sensing electrodes are of chromium and the covering insulating material includes a thin layer of chromium oxide which offers excellent scratch resistance and can be formed conveniently by oxidation of a surface region of the sensing electrodes. In a row and column array, address lines (18) extending between rows of electrodes (14) may also include chromium and be covered by chromium oxide. Preferably, the sensing electrodes and address lines are defined from a common deposited chromium layer.

REFERENCES:
patent: 4644801 (1987-02-01), Kustanovich
patent: 4682236 (1987-07-01), Wang et al.
patent: 4864462 (1989-09-01), Madou et al.
patent: 5000817 (1991-03-01), Aine
patent: 5348892 (1994-09-01), Miyake et al.
patent: 5515738 (1996-05-01), Tamori

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