Fingerprint detection apparatus
November 19, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesTouch activated controller and method Capacitive fingerprint sensor Surface-area pressure transducer and line-selection circuit for use therewith Tactile sensing method and apparatus having grids as a means to detect a physical parameter Semiconductor matrix type sensor for very small surface pressure distribution Transducer array Monolithic sensor of fingerprints Patent #: 5844287 InventorAssigneeApplicationNo. 195619 filed on 11/19/1998US Classes:73/862.474, Resistance strain gage73/862.52With variable capacity or sensitivityExaminersPrimary: Noori, MaxAttorney, Agent or FirmForeign Patent References
International ClassG01L 001/22Foreign Application Priority Data1997-11-27 JPAbstractProviding a fingerprint detection apparatus which is small in size, low in cost and high in reliability. The fingerprint detection apparatus includes a shape transfer unit having a contact face for being contacted by a finger whose fingerprint is to be detected, the shape transfer unit having a thickness which varies, when a finger contacts with a surface which serves as the contact face, in accordance with pressures which are produced by concave and convex patterns of the fingerprint of the finger, and a detection driving circuit unit for detecting a pattern of the fingerprint based on variations of the thickness of the shape transfer unit and outputting results of the detection as electric signals, and detects a fingerprint pattern in accordance with variations of the thickness of the shape transfer unit. | |
