Antenna coil for IC card and manufacturing method thereof
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United States of America Patent
Stats
-
Jun 4, 2002
Grant Date -
Feb 7, 2002
app pub date -
Jun 21, 2001
filing date -
Jun 23, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An antenna coil for an IC card includes a base material of a resin film having the thickness of at least 15 .mu.m and at most 70 .mu.m, and a circuit pattern layer formed on a surface of the base material, having the thickness of at least 7 .mu.m and at most 60 .mu.m formed of an aluminum foil containing aluminum by at least 97.5 mass % and at most 99.7 mass %. On the surface of the resin film base material, an aluminum foil containing aluminum is fixed by using a polyurethane based adhesive layer containing an epoxy resin, a resist ink layer having a prescribed pattern is printed on the foil, the foil is etched using the resist ink layer as a mask to form a circuit pattern layer, and the resist ink layer is removed.
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