BURGLAR ALARM Russian patent published in 1997 - IPC

FIELD: emergency alarm. SUBSTANCE: proposed invention refers to aids of emergency alarms in glazed apertures. Structure of burglar alarm includes electron unit for signal processing which radio elements 2 are positioned on printed-circuit board made from flexible foiled dielectric and anchored inside case 4 of burglar alarm. Spring contact is put on printed- circuit board on side of printed conductors. In case of unauthorized mechanical action on glass cloth elastic vibration emerge in cloth and cause vibrations of printed-circuit board which results in process of break-closure of spring contact. Short-time commutation signal of electric circuit causes transition of burglar alarm from stand-by to alarm mode. EFFECT: increased reliability of burglar alarm. 3 dwg