Patent ID: 6388562
Filing Date: 2002-05-14
Classification: G06K

Abstract:
A contactless IC card communication system comprising:a reader/writer (RW) and IC cards which communicate with each other on a contactless basis according to anti-collision techniques, the IC cards being of types which relate to the anti-collision techniques; first means provided in the reader/writer for implementing identification requirement with respect to given anti-collision techniques among the anti-collision techniques; second means provided in respective IC cards among the IC cards which use different anti-collision techniques respectively for implementing answers to the anti-collision technique identification requirement by the first means at different timings respectively; third means provided in the reader/writer for requiring identifications of types of the IC cards in dependence upon the given anti-collision techniques in response to the answers by the second means; fourth means provided in respective IC cards among the IC cards which use different anti-collision techniques respectively for returning identification data of the related IC cards in response to the card type identification requirements by the third means; and fifth means provided in the reader/writer for identifying the types of the IC cards in response to the identification data returned by the fourth means.