Pressure dependent capacitive sensing circuit switch construction
First Claim
1. A user interface for a product, wherein the user interface comprises a construction including a projected, charge transfer based capacitance measurement circuit connected to at least first and second sense plates of a sense plate structure for measuring the projected capacitance between said first and second sense plates, said sense plate structure being covered by an electrically conductive and electrically floating cover member, that at least forms an area above said sense plate structure, and the construction is such that force applied to the conductive cover member or a layer of material, that is attached to the conductive cover member, causes a deflection that changes a distance between the sense plate structure and the conductive cover member under the point of the applied force, wherein the projected capacitance measurement circuit provides measurement data to identify and differentiate between the following events:
- a. an object coming into proximity of the conductive cover member, without making physical contact therewith or said object coming into contact with the conductive cover member or material attached to the conductive cover member, and causing a decrease in the magnitude of the projected capacitance of the sense plate structure between the first and second sense plates measured by the projected capacitance measurement circuit; and
b. an object coming into contact with and applying more than a minimum force to the conductive cover member or material attached to the conductive cover member so that the conductive cover member or the material attached to the conductive cover member deflects and comes within a predetermined distance or makes contact with the sense plate structure in a way that causes an increase in the magnitude of the projected capacitance of the sense plate structure between the first and second sense plates measured by the projected capacitance measurement circuit.
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Accused Products
Abstract
A user interface which includes a capacitive measurement circuit with a sense plate covered by an electrically conductive cover member, and wherein said circuit may sense two types of events, said types distinguished by an inverse change in measured capacitance, and wherein user proximity and touches with less than a minimum required force constitute one event type, and touches with more than said minimum force constitute the other event type.
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Citations
20 Claims
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1. A user interface for a product, wherein the user interface comprises a construction including a projected, charge transfer based capacitance measurement circuit connected to at least first and second sense plates of a sense plate structure for measuring the projected capacitance between said first and second sense plates, said sense plate structure being covered by an electrically conductive and electrically floating cover member, that at least forms an area above said sense plate structure, and the construction is such that force applied to the conductive cover member or a layer of material, that is attached to the conductive cover member, causes a deflection that changes a distance between the sense plate structure and the conductive cover member under the point of the applied force, wherein the projected capacitance measurement circuit provides measurement data to identify and differentiate between the following events:
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a. an object coming into proximity of the conductive cover member, without making physical contact therewith or said object coming into contact with the conductive cover member or material attached to the conductive cover member, and causing a decrease in the magnitude of the projected capacitance of the sense plate structure between the first and second sense plates measured by the projected capacitance measurement circuit; and b. an object coming into contact with and applying more than a minimum force to the conductive cover member or material attached to the conductive cover member so that the conductive cover member or the material attached to the conductive cover member deflects and comes within a predetermined distance or makes contact with the sense plate structure in a way that causes an increase in the magnitude of the projected capacitance of the sense plate structure between the first and second sense plates measured by the projected capacitance measurement circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of implementing a touch sensing user interface comprising a projected, charge transfer based capacitance measurement circuit and at least one floating electrically conductive cover member, said cover member forming an area over at least first and second sense plates of a sense plate structure connected to said projected capacitance measurement circuit, and a surface to be touched by a user, and wherein the method further requires that force applied to a point on the touch surface results in a deflection that decreases the distance between the sense plate structure and the conductive cover member under the point of the applied force, and wherein the method includes the step of having the measurement data from the projected capacitance measurement circuit interpreted to identify and differentiate between the following events:
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a. an object coming into proximity of the conductive cover member without making physical contact with the conductive cover member or material attached to the conductive cover member or said object coming into physical contact with the conductive cover member or material attached to the conductive cover member; and
wherein said object causes a decrease in the magnitude of the projected capacitance of the sense plate structure between the first and second sense plates measured by the projected capacitance measurement circuit; andb. an object coming into physical contact with the conductive cover member or material attached to the conductive cover member and such object exerting more than a minimum force to result in the conductive cover member or the material attached thereto deflecting and the conductive member coming within a predetermined distance of or in contact with the sense plate structure to cause an increase in the magnitude of the projected capacitance of the sense plate structure between the first and second sense plates measured by the projected capacitance measurement circuit. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification