Patent ID: 7064716

Claim:
An integrated antenna type non-contact IC card reader/writer comprising: a circular or substantially rectangular or polygonal loop antenna, which supplies electric power and sending data to a non-contact IC card by electromagnetic induction and acquires receiving data from the non-contact IC card by a change in the load; a resonance matching circuit, which composes a resonance circuit for making the loop antenna resonate with a desired frequency and a matching circuit for matching impedance with a transmission line; a wireless sending portion, which supplies electric power and sending data to the loop antenna via the resonance matching circuit; a wireless receiving portion, which acquires receiving data from the loop antenna via the resonance matching circuit; and a control board on which the resonance matching circuit and a control portion for controlling the wireless sending portion and the wireless receiving portion are mounted, the control board being accommodated in a shielded case, wherein the components are arranged and assembled so that a central axis of the loop antenna in the thickness direction and a central axis of the shielded case in the thickness direction can be made to substantially coincide with each other.