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Ultrasonic sensor transmitting and receiving ultrasonic frequencies adjusted according to temperature

  • US 7,607,352 B2
  • Filed: 12/21/2006
  • Issued: 10/27/2009
  • Est. Priority Date: 01/06/2006
  • Status: Expired due to Fees
First Claim
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1. An ultrasonic sensor comprising:

  • a receiving member for receiving ultrasonic waves;

    a vibrator for converting the ultrasonic waves to electrical signals;

    a filter device for selecting electrical signals in a predetermined frequency region from the electrical signals converted by the vibrator; and

    a temperature sensor for detecting ambient temperature of the receiving member, wherein;

    the predetermined frequency region is changed according the ambient temperature, so that the frequency region of the electrical signals selected by the filter device always includes a resonant frequency of the receiving member.

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