2009-110144 is referenced by 54 patents.

PROBLEM TO BE SOLVED: To provide a highly durable coin-shaped RFID tag in which the molded joint face of a disk-shaped edged resin case and a cover-shaped part are hardly peeled from each other even when an expansion/contraction stress is repeatedly applied due to a change in environment over time, especially a cyclic change in temperature.SOLUTION: The coin-shaped RFID tag having almost uniform thickness is configured by molding a cover-shaped part 9 by injection molding by forming metallic boards 3 for weight adjustment like right and left asymmetrical shapes so that center lines 100A, 100B, 100C and 100D of a gap between the metallic boards 3 can be prevented from being concentrated on one point of the central part, and arranging those metallic board 3 while aligning the front and rear faces so that the cover-shaped part sides can become convex faces against any distortion to be generated in blanking.

Title
Coin-shaped rfid tag
Application Number
2007-280062
Publication Number
2009-110144
Application Date
October 29, 2007
Publication Date
May 21, 2009
Inventor
Nagura Toshikazu
Shinomiya Koki
Assignee
Oji Paper
IPC
G06K 19/07
G06K 19/077