Encapsulating a metal inlay with thermosetting resin and method for making a metal transaction card
Metal layers ( 650, 730, 750, 830, 850 ) of a smartcard (SC, 600, 700, 800 ) have module openings ( 614, 712, 714, 812, 814 ) for receiving a transponder chip module (TCM). Thermosetting resin (TR, 668 B, 768 A, 768 B, 868 A, 868 B) coats (encapsulates) the bottom surfaces and fills the module openings of the metal layers. A first metal layer ( 650, 750, 850 ) may have a slit (S; 620, 720 B, 820 ) which may also be filled by the thermosetting resin. A second metal layer (ML, 730 ) disposed above the first metal layer ( 750 ) may have a slit (S, 720 A) which may also be filled by the thermosetting resin. A booster antenna circuit (BAC, 844 ) may be disposed between the first and second metal layers, with magnetic shielding material ( 842 ) disposed between the booster antenna circuit and the second metal layer ( 730 ).
1. A smartcard (SC) comprising:
a first metal layer (ML) having a top surface, a bottom surface, and a module opening (MO) extending between the top and bottom surfaces for receiving a transponder chip module (TCM); and
a first layer of thermosetting resin encapsulating the bottom surface of the first metal layer and filling the module opening of the first metal layer;
further comprising:
a second metal layer (ML) having a top surface, a bottom surface, and a module opening (MO) extending between the top and bottom surfaces for receiving the transponder chip module; and
a second layer of thermosetting resin disposed on the bottom surface of the second metal layer and into the module opening of the second metal layer.
2. The smartcard (SC) of claim 1 , further comprising:
a first layer of inter-coat disposed between the first layer of thermosetting resin and at least the bottom surface of the first metal layer.
3. The smartcard (SC) of claim 1 , further comprising:
a second layer of thermosetting resin encapsulating the top surface of the first metal layer.
4. The smartcard (SC) of claim 1 , wherein:
the first metal layer is a discontinuous metal layer having a slit(S); and
the first layer of thermosetting resin encapsulates the bottom surface of the first metal layer also fills the slit in the first metal layer.
5. The smartcard (SC) of claim 1 , further comprising:
a second layer of inter-coat disposed between the second layer of thermosetting resin and the bottom surface of the second metal layer.
6. The smartcard (SC) of claim 1 , wherein:
the second metal layer is a discontinuous metal layer having a slit(S); and
the second layer of thermosetting resin on the bottom surface of the second metal layer also fills the slit in the second metal layer.
7. The smartcard (SC) of claim 1 , wherein:
the second metal layer is a continuous metal layer, not having a slit(S).
8. The smartcard (SC) of claim 7 , further comprising:
a booster antenna circuit (BAC) disposed between the second continuous metal layer and the first discontinuous metal layer; and
magnetic shielding material disposed between the second continuous metal layer and the booster antenna circuit.
9. The smartcard of claim 8 , wherein:
the second layer of thermosetting resin separates the booster antenna circuit a given distance from the magnetic shielding layer to achieve optimum shielding and RF functionality.
10. The smartcard (SC) of claim 1 , further comprising:
an adhesive layer disposed between the first resin encapsulated metal layer and the second resin encapsulated metal layer.
11. The smartcard (SC) of claim 1 , wherein:
the transponder chip module is a dual-interface module.