Capacitive sensing array device
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United States of America Patent
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Sep 14, 1999
Grant Date -
N/A
app pub date -
Jul 18, 1997
filing date -
Jul 20, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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