Patent ID: 6873033

Claim:
A method of manufacturing a coin-shaped IC tag, wherein the coin-shaped IC tag comprises an IC packaging base member in which an electronic circuit for communicating data and for recording data is mounted on a base material; a first resin material having a specific gravity greater than about 2, and which is formed into a flat shape; an IC tag core which is formed by joining the first resin material in the flat shape and said IC packaging base member; and a covering which is formed of a second resin material at, at least, an outer peripheral edge of a surface of said IC tag core so as to present a coin shape wherein a method of manufacturing the coin-shaped IC tag wherein two members are formed of said first resin material in said flat shape, and said IC tag core is formed by interposing said IC packaging base member between said two members, the method comprising the steps of: forming the base material of said IC packaging base member out of a resinous film; and working said IC tag core by heating under pressure, thereby to fuse the resinous film and to bring interfaces of said two members of said first resin material into contact, until the interfaces are bonded.