| 摘要 |
PROBLEM TO BE SOLVED: To build in an RFID tag having relatively high sensitivity while keeping a high-grade feel. SOLUTION: This wristwatch with a built-in tag is provided with: a watch case 12 having an annular frame 12a, a glass lid 12b and a back lid 2c; a drive part 13 housed in the watch case; an indication part 14 driven by the drive part for indicating a time; and the RFID tag 18 housed in the watch case and composed of an antenna 16 and an IC chip 17. The annular frame is formed of a metal material, the back lid is formed of an electric insulation material, the annular frame has at least one slit 12e, and the antenna is provided with a coil 16b wound so as to surround the drive part along the inside surface of the annular frame. The slit is filled with a non-conductive resin and its facing cut flat surfaces are bonded to each other. The antenna is provided with a magnetic core member 16a formed in a ring-like shape so as to surround the drive part 13 along the inside surface of the annular frame, and the coil 16b is wound around the circumference of the core member 16a. |
