CONTACTLESS INFORMATION MEDIUM, BOBBIN MEMBER FOR CONTACTLESS INFORMATION MEDIUM, BODY MEMBER FOR CONTACTLESS INFORMATION MEDIUM, AND METHOD FOR PRODUCING CONTACTLESS INFORMATION MEDIUM

摘要

An easily manufacturable contactless information medium and the like are provided such that when a plurality of the contactless information media are stacked, each of the plurality of contactless information media is able to communicate with a communication device. The contactless information medium comprises a main body forming the external shape of the contactless information medium, an IC chip (14) housed inside the main body, and a coil antenna, comprised of a series of conducting wires (15) of which the ends thereof are connected to the IC chip (14). The coil antenna includes a primary routing pattern formed along a closed curve (C) and a plurality of secondary routing patterns that each has a diameter smaller than the diameter of the primary routing pattern. The contactless information medium is further equipped with a plurality of bobbins placed inside the main body and along the closed curve (C), wherein the plurality of bobbins includes a plurality of bobbin units (13b) which by winding the series of conducting wires (15) therearound along the closed curve (C) form the primary routing pattern and also by winding the series of conducting wires (15) around each of the plurality of bobbin units (13b) form the secondary routing patterns.