WRISTWATCH WITH BUILT-IN TAG

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 12c; 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 antenna is provided with a rod-like magnetic core member 16a formed along the inside surface of the back lid 12c between the annular frame and the drive part and a coil 16b spirally wound around the core member 16a. The core member 16a has a shape curved along the inside surface of the annular frame and is formed of a layered product or composite material of amorphous foil so as to have flexibility. The composite material contains 10-70 vol.% of a soft-magnetism ferrite, or powder or flakes of a soft-magnetism metal, and flexibility formed. The composite material is injection-molded or compression-molded.