Patent ID: 9569939
Date: 2017-02-14
CPC Classifications: A61J,G01D,G08B

Claim:
1. An event detector having a Barkhausen switching element surrounded by a sensor coil, a circuit, a passive display which does not require a float voltage, and a magnet arranged to be moved back and forth relative to the switching element whereby the switching element can be remagnetized in a bistable manner by magnetic fields of the magnet as it is moved back and forth relative to the switching element, and wherein the circuit and the passive display are disposed on a glass or film substrate and can be activated by a single voltage pulse from the sensor coil until said pulse decays, whereby an indication of the display is changed by the single voltage pulse after processing thereof by the circuit, said indication representing updated information relating to a count of voltage pulses in a waiting condition without a further energy requirement.