×

ALARM SYSTEM

  • US 20120161976A1
  • Filed: 07/20/2011
  • Published: 06/28/2012
  • Est. Priority Date: 12/28/2010
  • Status: Active Grant
First Claim
Patent Images

1. An alarm system for alarming when a distance from an object is less than a threshold distance, comprising:

  • a signal generating circuit adapted to generate a first signal;

    a distance detecting circuit adapted to receive the first signal, detect a distance between the object and the alarm system, output a second signal and a third signal according to the distance;

    a gate circuit adapted to receive the second signal and the third signal and output a voltage level signal;

    a voltage conversion circuit adapted to receive the voltage level signal and convert the voltage level signal to a DC voltage signal;

    a distance judging circuit adapted to receive the DC voltage signal and compare the DC voltage signal with a reference voltage signal to output a control signal; and

    an alarm circuit adapted to receive the control signal and produce an alarm when the distance between the object and the alarm system is less than the threshold distance.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×