Contactless electronic media e.g. contactless sense card, case e.g. map case, for e.g. tollbooth, has light emitting diode transmitting validation signal when traversed by induced current due to electromagnetic field of media reader antenna

摘要

The case has a light emitting diode (4) connected to ends of a metallic loop (3), and a slot (31) inside which a contactless sense card (2) is slid. The diode transmits a validation signal when it is traversed by an induced current exceeding a given threshold. The induced current is created by an electromagnetic field induced by an antenna of a contactless media reader.