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Reducing edge effects within segmented acoustic imaging systems

  • US 9,904,836 B2
  • Filed: 08/11/2015
  • Issued: 02/27/2018
  • Est. Priority Date: 09/30/2014
  • Status: Active Grant
First Claim
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1. A fingerprint imaging system comprising:

  • a substrate comprising;

    a top surface defining an imaging area for receiving a fingerprint; and

    a bottom surface opposite the top surface;

    a plurality of transducers in acoustic communication with the bottom surface, each configured to produce an acoustic output into the substrate toward the top surface in response to an electronic activation pulse, the plurality of transducers comprising;

    a first contiguous set of transducers comprising least two transducers associated with an imaging subarea of the imaging area; and

    a second contiguous set of transducers disjoint with and separately controllable from the first contiguous set and comprising at least two transducers sharing a perimeter of the first contiguous set; and

    a controller configured to;

    provide an electronic activation pulse substantially simultaneously to each transducer associated with the first and second contiguous sets, while all other transducers not in the first and second sets are disabled; and

    obtain electrical signals from each transducer of the first contiguous set while rejecting electrical signals from each transducer of the second contiguous set.

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