Capacitive sensing device comprising perforated electrodes
First Claim
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1. A capacitive sensing device, comprising:
- at least one capacitive electrode formed from a substantially conductive material; and
at least one guard component placed in proximity to the at least one capacitive electrode;
wherein the at least one guard component includes at least one first opening arranged within or at an edge of the at least one guard component, and the at least one first opening is configured to reduce a coupling capacitance between the at least one capacitive electrode and the at least one guard component.
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Abstract
This invention relates to a capacitive sensing device comprising (i) at least one capacitive electrode (12) with a substantially conductive material arranged so as to form a conductive surface (51); (ii) at least one guard component placed close to said at least one capacitive electrode (12); said capacitive electrode(s) (12) comprises(comprise) at least one opening (52) without conductive material arranged within or on the edge of the conductive surface (51) so as to reduce the coupling capacitance between said capacitive electrode(s) (12) and said guard component(s).
The invention also relates to an apparatus implementing the device.
84 Citations
17 Claims
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1. A capacitive sensing device, comprising:
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at least one capacitive electrode formed from a substantially conductive material; and at least one guard component placed in proximity to the at least one capacitive electrode; wherein the at least one guard component includes at least one first opening arranged within or at an edge of the at least one guard component, and the at least one first opening is configured to reduce a coupling capacitance between the at least one capacitive electrode and the at least one guard component. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for capacitive sensing, comprising:
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forming at least one capacitive electrode from a substantially conductive material; placing at least one guard component in proximity to the at least one capacitive electrode; forming at least one first opening within or at an edge of the at least one guard component; and forming the at least one first opening to reduce a coupling capacitance between the at least one capacitive electrode and the at least one guard component. - View Dependent Claims (8, 9, 10, 11)
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12. A capacitive sensing device, comprising:
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sensing means for detecting an object in proximity to the capacitive sensing device; guard means in proximity to the sensing means for shielding the sensing means; and first means, formed within or at an edge of the guard means, for reducing an area of the guard means, wherein the first means are configured for reducing a coupling capacitance between the sensing means and the guard means. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification