Capacitive fingerprint acquisition sensor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jan 18, 2000
Grant Date -
N/A
app pub date -
Dec 15, 1995
filing date -
Dec 15, 1995
priority date (Note) -
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Abstract
An apparatus for detecting topographic variations on an object such as a finger includes an array of sensing elements disposed on a substrate which each have a parasitic capacitance. An insulating receiving surface is disposed over the array of sensing elements and is adapted to receive the object such that a sensing element and a portion of the object located thereabove creates a measurable change in capacitance with respect to the parasitic capacitance. An electronic circuit is coupled to the array of sensing elements for measuring the measurable change in capacitance.
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