Non-contact IC card
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorKenichi Takahira
Life of this patent
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Abstract
A non-contact IC card has a high mechanical strength with respect to bending and twisting, although thin, yet allows the mounting area of a circuit board to be effectively used. A highly rigid, electrically-conducting reinforcing frame is disposed on the outer edge of a circuit board to increase the mechanical strength of the card with respect to bending and twisting. Further, the reinforcing frame is electrically connected to conductor patterns of a spiral coil on the circuit board having an inductance L in an antenna circuit.
Claims4
A non-contact IC card for exchanging signals with an external apparatus by means of electromagnetic waves comprising:
- a circuit board;
- circuitry centrally mounted on said circuit board for data processing, control, and storage;
- an electrically-conductive reinforcing frame along an outer edge of said circuit board around said circuitry, said electrically-conductive reinforcing frame having a gap;
- an antenna circuit electrically connected to said circuitry and comprising a spiral coil along said outer edge of said circuit board and electrically connected in series with said electrically-conductive reinforcing frame and a capacitor on said circuit board at said circuitry, said spiral coil and said electrically-conductive reinforcing frame together having an inductance L and said capacitor having a capacitance C;
- and
- a casing of a non-electrically-conductive material encapsulating said circuit board, circuitry, and reinforcing frame.
Dependencies are inferred from the claim text.