Laminated capacitive touch-pad
First Claim
1. A capacitive touch-pad comprising:
- a first layer of dielectric material having first and second surfaces, said first surface being outwardly facing and exposed to an external environment;
a first electrode fabricated upon said first surface to be exposed to said external environment and responsive to contact with a human body member;
a pair of spatially separated second and third electrodes fabricated upon said second surface substantially within the boundaries of said first electrode; and
a second layer of rigid dielectric material laminated to said second surface in abutment with said second and third electrodes;
said first layer having a thickness predeterminately selected to cause an electrical capacitance between each of said second and third electrodes and said first electrode to be greater than the parasitic capacitance between said first and second electrodes.
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Accused Products
Abstract
A laminated capacitive touch-pad having a thin film touch-plate electrode deposited upon a first (exterior) surface of a first, relatively thin dielectric layer and having spaced transmitter and receiver electrodes deposited upon a second surface of the first layer within the outline of and opposite to the touch electrode, with a relatively thick backing layer of dielectric material laminated upon the second surface to provide a total thickness, as measured between the furthest opposed surfaces of the first and second layers, as required for high voltage insulation purposes and to provide additional impact strength. The touch, transmitter and receiver electrodes may be of thin film construction.
39 Citations
9 Claims
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1. A capacitive touch-pad comprising:
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a first layer of dielectric material having first and second surfaces, said first surface being outwardly facing and exposed to an external environment; a first electrode fabricated upon said first surface to be exposed to said external environment and responsive to contact with a human body member; a pair of spatially separated second and third electrodes fabricated upon said second surface substantially within the boundaries of said first electrode; and a second layer of rigid dielectric material laminated to said second surface in abutment with said second and third electrodes; said first layer having a thickness predeterminately selected to cause an electrical capacitance between each of said second and third electrodes and said first electrode to be greater than the parasitic capacitance between said first and second electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification