Capacitive card module

Details Capacitive card module Capacitive card module

1989-09-25

1991-07-23

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 22, 307116, H03K 1794, H01H 3500

Patent

active

050347403

ABSTRACT:
A capacitive card module is composed of a plurality of capacitive switch elements arranged on a carrier layer. In order to reduce parasitic coupling capacitances, the carrier layer is provided with a first shielding surface fashioned as an interconnect grid and connected to a voltage potential, and second shielding surfaces are located in the grid regions of the first shielding surface. The first shielding surface is composed of a conductor material that is electrically more conductive than that of the second shielding surfaces.

REFERENCES:
patent: 3240885 (1966-03-01), Grunfelder et al.
patent: 3668417 (1972-08-01), Sessler et al.
patent: 4090092 (1978-05-01), Serrano
patent: 4326195 (1982-04-01), Seki et al.
patent: 4336529 (1982-06-01), Buan
patent: 4405917 (1983-09-01), Chai
patent: 4539554 (1985-09-01), Jarvis et al.
patent: 4876461 (1989-10-01), Gratke

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