Communication device performing medium detection by near field communication, external device, and external medium communication system

摘要

In an external medium communication system including a non-contact card 300, which is an external medium, and a card communication device 400, which is a communication device, the non-contact card 300 includes a conductive unit 320, and the card communication device 400 includes a detection antenna unit 420 including a detection output antenna 421 and a detection input antenna 422. When the external medium 300 is mounted in a predetermined position, the card communication device 400 detects that the non-contact card 300 is in the predetermined position by detecting that the detection output antenna 421 and the detection input antenna 422 are coupled by electromagnetic induction across the conducting unit 320.

主权项

1. An external medium communication system comprising an external medium and a communication device for communicating with the external medium,
the external medium including a conducting unit constituted by a first coil, a second coil, and a wiring unit connecting one end of the first coil to one end of the second coil and connecting another end of the first coil to another end of the second coil, the communication device including:
an external medium detection antenna unit constituted by a coiled first antenna and a coiled second antenna;a current supply unit configured to supply current to the first antenna; andan external medium detection unit configured to detect that the first antenna and the second antenna are coupled by electromagnetic induction across the conducting unit by detecting a first induced electromotive force produced in the second antenna, the wiring unit and the external medium detection antenna unit being positioned so that when the external medium is mounted in a predetermined position, the first antenna and the first coil face each other, and the second antenna and the second coil face each other, the external medium further including a permanent magnet positioned so as to pass by a location adjacent to the second antenna while the external medium is being inserted into and removed from the communication device, and the external medium detection unit further configured to detect a second induced electromotive force produced in the second antenna due to the permanent magnet passing by the location adjacent to the second antenna.