G - Physics – 08 – B
Patent
G - Physics
08
B
340/124.2
G08B 1/08 (2006.01) H03K 17/96 (2006.01)
Patent
CA 1152603
ABSTRACT In capacitive systems for touch control switching comprising a dielectric sheet having a first electrode on one side thereof, and on the other side thereof in capacitive relation with the first elec- trode, second and third electrodes which are mutually spaced, one of the second and third electrodes being adapted for connection to a current signal source and the other of them being adapted for connection to an output signal circuit, it is desired to achieve a favorable compromise between high capacitance modifi- cation as between touched and untouched condition of the first electrode, and the total amount of material used to form the electrodes. To this end, of the second and third electrodes, one constitutes an inner electrode and the other constitutes an outer electrode and is shaped to surround at least the major part of the periphery of the inner electrode, and the ratio of the area of the inner electrode to the area of the outer electrode is greater than 0.25 to 1. By arranging the second and third electrodes in this way, it is possible for a given dimension of a capacitive system to have the best compromise between capacitance, capacitance modification and quantity of material used for the electrodes.
357113
Bfg Glassgroup
Swabey Ogilvy Renault
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