Improvements in authentication cards

Details Improvements in authentication cards Improvements in authentication cards

G - Physics

06

K

G06K 19/00 (2006.01) G06K 19/07 (2006.01) G06K 19/077 (2006.01) G07F 7/10 (2006.01)

Patent

CA 2290184

This invention relates to authentication cards, that is, cards usually of the dimensional format established for "smart cards" which provide data to a terminal for the purpose of establishing the authorization of the holder of the card to use the terminal. An aspect of the invention is a card incorporating a microcontroller, a contact interface in accordance with ISO 7816, and an acoustic interface for outputting FSK modulated data using telephone voice-based frequencies, wherein the microcontroller generates an internal clock signal, but the contact interface is synchronized by an external clock signal received through the interface, when communicating through the latter, and the microcontroller utilizes the internally generated clock signal to generate frequencies used when communicating through the acoustic interface, the FSK modulation being characterized by the ratio of the frequencies used rather than the absolute frequencies. Another aspect of the invention is a membrane switch comprising three superposed membranes supported within a recess in the card such that the inner membrane and substantial portions of the peripheries of the outer and spacer membranes are independently supported by the material of the card. Another aspect of the invention is the mounting of a disk-type acoustic transducer element within a cavity defined within a core layer of the card (the core being sandwiched between two outer layers, using conductive elastomeric bodies to provide electric connections to the transducer element without substantially dampening resonance of the transducer. A still further aspect of the invention provides programmable non-volatile memory in the microcontroller and additional contacts connected to programming leadouts of the microcontroller for use in programming that memory.

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