ANTENNA COIL, IDENTIFICATION TAG USING THE SAME, READER- WRITER APPARATUS, READER AND WRITER

摘要

PROBLEM TO BE SOLVED: To provide an antenna coil which reliably operates, even when being closely contacted to a metal matter, and is formed into a very thin thickness. SOLUTION: The antenna coil 11 has one or more spirals 13a of a series of first conductors 13 formed on one main surface of a foldable single electric insulation film or sheet 14 folded at the center of the spiral 13a, a film-like, foil-like, sheet-like or flat plane-like core member 12 is provided between the folded film or sheets 14. Both-end connection parts piecing the other main surface of the film or sheet 14 to mutually connect one end of the series of first conductors 13 and the other end are formed of a second conductor 15 on the other main surface of the film or sheet 14. The core member is preferably a magnetic paint film formed by applying ink or paint containing a magnetic powder to the main surface of the insulation film or sheet 14 and drying it.