| CPC H05K 1/028 (2013.01) [H05K 1/0269 (2013.01); H05K 1/186 (2013.01); H05K 2201/09918 (2013.01)] | 6 Claims |
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1. A flexible printed board comprising:
a base film with an optical transmissivity;
a copper foil pattern on a first face of the base film, all regions of a face of the copper foil pattern facing the base film being in contact with the base film, wherein the copper foil pattern is configured to function as a recognition mark;
a first face coverlay covering the copper foil pattern and bonded to the first face of the base film; and
a second face coverlay having a larger opening formed therein than the copper foil pattern, wherein the second face coverlay is bonded to a second face of the base film such that the copper foil pattern is contained within the opening when viewed through the base film,
wherein the copper foil pattern has a hollow shape with an outer circumferential section and an inner circumferential section,
wherein the first face coverlay has an opening formed therein and covers the outer circumferential section of the copper foil pattern such that an edge of the opening is positioned between the outer circumferential section and the inner circumferential section of the copper foil pattern, and
wherein at least as much of the copper foil pattern is uncovered from the first face coverlay than is covered by the first face coverlay.
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