Patent ID: 7889084

Claim:
An ID detection device configured to read IDs of individuals of plural RFID tags which are arranged close to one another forming a row of tags, comprising: a transmit/receive antenna unit comprising: a transmit/receive antenna configured to communicate with the RFID tags; a movement mechanism configured to reciprocate the transmit/receive antenna scan in a row direction in which the RFID tags are arranged, wherein a file folder binds a plural of sheets to each of which the RFID tag is bonded at a predetermined position to form a tag row constituted by the RFID tags arranged close to one another in a row is placed on the transmit/receive antenna unit so that the movement mechanism reciprocates the transmit/receive antenna linearly in a row direction in which the RFID tags are arranged to communicate with the RFID tags, and wherein the transmit/receive antenna has a dipole antenna unit and a reflector part cooperating such that a transmit direction of an electric wave from the transmit/receive antenna and a maximum gain direction of the RFID tags are parallel to one another.