Patent ID: 6452481
Filing Date: 2002-09-17
Classification: G06K,G07C

Abstract:
Detection and reading apparatus for transponders that cross through a controlled passage and which is adapted to reduce the levels of radiation to which a human transponder carrier is subjected, and for operation of external equipment when said apparatus detects a proper transponder code, said apparatus including;a) transmitting coil means for emitting radiation across said passage, b) receiving coil means for receiving the radiation emitted by said transmitting coil means and installed in a position spaced apart from the said transmitting coil means defining a transit path therebetween, c) said transmitting and receiving coil means being adapted to activate a transponder passing through said passage and to read its emissions, d) logic control circuit means electronically connected to said receiving coil means, said logic control means having an output connected to said external equipment to be operated, e) command output means associated with said logic control circuit being electronically connected to said transmitting coil means, f) said transmitting coil means emitting an electromagnetic field periodically for short time intervals in order to detect the presence of a transponder within the passage, g) said logic control circuit acting through said command output means upon detecting the presence of a transponder within the passage to activate the transmitting coil means for a longer interval in order to activate and read the transponder code.