Fingerprint sensor
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United States of America Patent
Stats
-
Jan 31, 1984
Grant Date -
N/A
app pub date -
Jul 30, 1981
filing date -
Jul 30, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fingerprint sensor for transforming the topological pattern of a finger into an electric output signal. The sensor includes an array of cells arranged beneath a contact surface for sensing the pressure and/or temperature variations existing at the surface as a result of a fingerprint pressed against it. Each cell includes a transistor set to operate at a point within its amplification range. This operating point is varied in dependence upon the pressure and/or temperature at the adjacent contact surface. A circuit is provided to measure the amount of current passing through the transistor in each cell and to derive an electrical output signal therefrom.
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