Apparatus and operative method for detection and reading of transponders in a controlled passage
First Claim
1. 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.
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Accused Products
Abstract
A detection and reading apparatus is provided for detecting the presence and reading a coded transponder that moves through a controlled passage. The apparatus is programmed to control a transmitting coil Tx so as to repeatedly emit a transponder detecting electromagnetic field only for a brief interval of the transmission signal period, of minimum duration, but sufficient to allow the transponder to emit a presence signal. When the apparatus receives the presence signal, the transmission coil receives instructions to emit an electromagnetic field of longer duration, sufficient to activate the transponder so that emits its own complete code signal that can be read and decoded. The transmission coil is then instructed to emit a repetitive electromagnetic field that remains of brief duration while the transponder is within the passage and when the transponder presence signal terminates, the detection and reading apparatus rests itself.
4 Citations
9 Claims
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1. 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;
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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. - View Dependent Claims (2, 3)
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4. A method of controlling a detection and reading apparatus for transponders having coded signals passing through a controlled passageway 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 spaced apart transmission and receiver coils on either side of the passage, a logic control circuit connected to said receiver coil and having output terminals connected to said receiver coil and having output terminals connected to and adapted to operate said external equipment upon receiving a proper coded signal from the transponder, and command terminal means associated with said logic control circuit for controlling emissions from the transmission coil for detecting the presence of a transponder within the passage and for reading in conjunction with said receiver coil the coding on said transponder whose presence has been detected, comprising the steps of;
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commanding the transmitting coil repeatedly to emit an electromagnetic field for the minimum period of time required to cause said transponder to emit a presence response signal, commanding the transmitting coil only following the reception by the receiving coil of a transponder presence signal in the passage to emit an electromagnetic field of longer duration and for a sufficiently long interval to cause the transponder to emit its coded signal and to be read by the receiver coil and logic control circuit, commanding the transmitting coil subsequent to reception by the receiver coil of the complete transponder coded signal to repeatedly emit an electromagnetic field for a brief duration as long as the identified transponder remains in the controlled passage, and resetting the apparatus when the receiving coil ceases to receive a transponder presence signal within the passage within a preselected and programmed time interval. - View Dependent Claims (5, 6, 7, 8, 9)
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Specification