| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide contactless IC card products which can cope with addition of the kinds of contactless IC cards, in a short time, even if the kinds of contactless IC cards are added, without spending fee and time on designing and on preparing the original plates of circuit films. <P>SOLUTION: An antenna pattern 8 is arranged in a loop form, in a circuit film 4 of a contactless IC card 1, and a dummy pattern 12 is arranged inside the antenna pattern 8. The dummy pattern 12 is arranged so that it covers metallic masses 7a and 7b that are to be mounted on the contactless IC card 1. The arrangement of the dummy pattern 12 can make the influence on an electromagnetic wave constant at communication with an external device. Consequently, the kinds of the metallic masses 7a and 7b can be changed arbitrarily, without changing the design of the antenna pattern 8. <P>COPYRIGHT: (C)2007,JPO&INPIT |
