Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
May 4, 2010
Patent Application Number
11568395
Date Filed
April 26, 2005
Patent Citations Received
Patent Primary Examiner
Patent abstract
A method and apparatus for detecting blood flow in or at a subject's fingertip (20) or other body part, in which Doppler-shifted measuring beam radiation (18) is reflected by the red blood cells and re-enters the laser cavity of the laser diode (10), so as to effect changes in operation thereof, such changes being representative of the blood flow. The apparatus may be incorporated in a fingerprint sensor as a “liveness” detector.
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