Fingerprint acquisition sensor

Details Fingerprint acquisition sensor Fingerprint acquisition sensor

G - Physics

06

K

G06K 9/00 (2006.01) G01B 7/004 (2006.01) G01B 7/34 (2006.01) G06F 3/033 (2006.01) G07C 9/00 (2006.01)

Patent

CA 2190544

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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