Equalizing reference surface capacitance with uneven thickness
First Claim
1. A capacitive sensing apparatus comprising:
- a capacitive sensor configured to sense an object proximate to a physical capacitive sensing reference surface; and
a plurality of dielectric materials disposed between the capacitive sensor and the physical capacitive sensing reference surface, at least one of said plurality of dielectric materials having non-uniform thickness, wherein said plurality of dielectric materials is configured such that capacitive coupling between said capacitive sensor and said object proximate to said physical capacitive sensing reference surface is substantially constant across said physical capacitive sensing reference surface.
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Abstract
One embodiment in accordance with the invention includes a capacitive sensing apparatus that includes a capacitive sensor configured to sense an object proximate to a physical capacitive sensing reference surface. The capacitive sensing apparatus also includes a plurality of dielectric materials disposed between the capacitive sensor and the physical capacitive sensing reference surface. Note that at least one of the plurality of dielectric materials has a non-uniform thickness. The plurality of dielectric materials can be configured such that capacitive coupling between the capacitive sensor and the object proximate to the physical capacitive sensing reference surface is substantially constant across the physical capacitive sensing reference surface.
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Citations
22 Claims
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1. A capacitive sensing apparatus comprising:
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a capacitive sensor configured to sense an object proximate to a physical capacitive sensing reference surface; and
a plurality of dielectric materials disposed between the capacitive sensor and the physical capacitive sensing reference surface, at least one of said plurality of dielectric materials having non-uniform thickness, wherein said plurality of dielectric materials is configured such that capacitive coupling between said capacitive sensor and said object proximate to said physical capacitive sensing reference surface is substantially constant across said physical capacitive sensing reference surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A capacitive sensing apparatus comprising:
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a two-dimensional capacitive sensor configured to sense an object proximate to a tangible capacitive sensing reference surface; and
a plurality of layers of dielectric material disposed between said two-dimensional capacitive sensor and said tangible capacitive sensing reference surface, at least one of said plurality of layers of dielectric material having varying thickness, wherein said plurality of layers of capacitive material is configured such that the specific capacitance per unit area between said two-dimensional capacitive sensor and said conductive object proximate to said tangible capacitive sensing reference surface remains approximately constant across said tangible capacitive sensing reference surface. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method comprising:
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disposing a first dielectric material having varying thickness above a capacitive sensor; and
disposing a second dielectric material adjacent to said first dielectric material;
wherein capacitive coupling of said capacitive sensor through said first and second dielectric materials to an object proximate to a physical capacitive sensing reference surface is approximately constant across said physical capacitive sensing reference surface. - View Dependent Claims (19, 20, 21, 22)
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Specification