Patent ID: 7202787

Claim:
A non-authentic article discrimination system for discriminating whether an article to which an IC tag is attached is a non-authentic article, the non-authentic article discrimination system comprising: the IC tag; and a base device; wherein the IC tag includes: a first antenna portion for receiving a radio wave; a power generation circuit for generating electric power from the radio wave received by the first antenna portion; a first storing portion for storing a first code and a second compute code, a receiving circuit to which the electric power is supplied from the power generation circuit, and which receives the radio wave from the first antenna portion; a discrimination circuit which performs a first process for discriminating whether the first code stored in the first storing portion coincides with a second code received by the receiving circuit, and a second process for discriminating whether the second compute code stored in the first storing portion coincides with second computed result information received by the receiving circuit; a first computing circuit in which, depending on a discrimination result between the first code and the second code made by the discrimination circuit, when the first code coincides with the second code, first computed result information is generated by computing the first code; an output circuit for outputting the first computed result information generated by the first computing circuit; and a light-emitting diode in which, depending on a discrimination result between the second computed result information and the second compute code made by the discrimination circuit, when the second computed result information coincides with the second compute code, emission of light is performed, and the base device includes: a radio wave supplying circuit for supplying the radio wave to the IC tag; a second storing portion for storing the second code; a second receiving circuit for receiving the first computed result information outputted by the output circuit of the IC tag; a second storing portion for storing the second code; a second receiving circuit for receiving the first computed result information outputted by the output circuit of the IC tag; a second computing circuit for generating the second computed result information by computing the first computed result information received by the second receiving circuit; and a second output circuit for performing at third process in which the second code is outputted to the IC tag, and a fourth process in which the second computed result information is outputted to the IC tag.