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Proximity sensor

  • US 10,615,792 B2
  • Filed: 10/21/2016
  • Issued: 04/07/2020
  • Est. Priority Date: 10/22/2015
  • Status: Active Grant
First Claim
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1. An electronic device having a front surface and including an ultrasonic proximity sensor arrangement comprising:

  • an ultrasonic transmitter recessed from a front surface of the device;

    an ultrasonic receiver recessed from the front surface of the device wherein the ultrasonic receiver is recessed further from the front surface of the device than the ultrasonic transmitter, forming a channel in which the ultrasonic receiver is positioned, wherein the channel comprises two discrete signal paths with first and second different lengths, the difference between the first and second lengths being substantially equal to an odd integer multiple of a wavelength of a signal transmitted from the ultrasonic transmitter; and

    an acoustic barrier extending between the transmitter and receiver in the direction of the front surface of the device so as to block a direct path comprising ultrasonic signals travelling directly from the transmitter to the receiver,the ultrasonic proximity sensor arrangement being arranged to determine proximity of an object to said front surface based on an indirect signal received by the ultrasonic receiver, wherein the received indirect signal is a reflection from said object of a signal transmitted from the ultrasonic transmitter.

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