Patent ID: 10078764

Abstract:
There is provided a tamper responsive sensor comprising a carrier printed circuit board, carrier PCB, holding a mesh of one or more electrically conductive tracks. The sensor also holds a pressure or force sensitive switch contact arranged on top of the carrier PCB, which contact has first and second electrical contact connections. Furthermore, the sensor has a tamper detecting circuitry arranged at the carrier PCB, which circuitry is powered via two electrical power lines, and which circuitry is connected to one or more electrically conductive signal lines. One of the power lines or one of the signal lines is electrically connected to the tamper detecting circuitry via a first tamper line holding the switch contact, and one of the power lines or one of the signal lines is electrically connected to the tamper detecting circuitry via a second tamper line holding a conductive track of the carrier PCB mesh, thereby enabling the tamper detecting circuit to detect an interruption of the signal path through the first tamper line and/or an interruption of the of signal path through the second tamper line.