Antenna coil for IC card and manufacturing method thereof
First Claim
1. An antenna coil for an IC card, comprising:
- a base material containing resin and having a thickness of at least 15 μ
m and at most 70 μ
m; and
a circuit pattern layer formed on a surface of said base material, having a thickness of at least 7 μ
m and at most 60 μ
m, formed of a foil containing aluminum of at least 97.5 mass % and at most 99.7 mass %.
1 Assignment
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Accused Products
Abstract
An antenna coil for an IC card includes a base material of a resin film having the thickness of at least 15 μm and at most 70 μm, and a circuit pattern layer formed on a surface of the base material, having the thickness of at least 7 μm and at most 60 μm 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.
128 Citations
20 Claims
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1. An antenna coil for an IC card, comprising:
-
a base material containing resin and having a thickness of at least 15 μ
m and at most 70 μ
m; and
a circuit pattern layer formed on a surface of said base material, having a thickness of at least 7 μ
m and at most 60 μ
m, formed of a foil containing aluminum of at least 97.5 mass % and at most 99.7 mass %. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20)
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16. A method of manufacturing an antenna coil for an IC card, comprising the steps of:
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fixing, on a surface of a base material containing resin and having a thickness of at least 15 μ
m and at most 70 μ
m, a foil containing aluminum by at least 97.5 mass % and at most 99.7 mass % and having a thickness of at least 7 μ
m and at most 60 μ
m by using an adhesive;
printing a resist ink layer having a prescribed pattern on said foil;
etching said foil using said resist ink layer as a mask to form a circuit pattern layer containing aluminum; and
after etching said foil, removing said resist ink layer.
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Specification