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Security device

  • US 5,274,354 A
  • Filed: 03/03/1993
  • Issued: 12/28/1993
  • Est. Priority Date: 08/18/1989
  • Status: Expired due to Term
First Claim
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1. A security device, comprising:

  • a portable transmission unit for transmitting a start or stop security signal, and for transmitting a sensor circuit characteristic signal;

    a receiving unit disposed on an automobile for receiving the security signal and the sensor circuit characteristic signal from the transmission unit;

    a sensor disposed on the automobile for detecting an abnormal event occurring to the automobile and for providing an alarm signal indicative of the abnormal event;

    a sensor circuit having adjustable sensitivity characteristics for receiving the alarm signal output from the sensor and for generating a security control signal; and

    a security control section for receiving the security control signal and for causing a theft prevention device to be activated after the security control signal from the sensor circuit is received;

    wherein the sensitivity characteristics of said sensor circuit can be adjusted by said sensor circuit characteristic signal sent by the transmission unit.

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