Multi-zone capacitive force sensing device and methods
First Claim
1. An apparatus comprising:
- a plurality of capacitors each having an upper conductive surface and a lower conductive surface substantially parallel to the upper conductive surface;
a housing with a top plate and a bottom plate to encompass the plurality of capacitors;
a sensor in the housing to generate a measurement based on a change in a distance between the upper conductive surface and the lower conductive surface of each of the plurality of capacitors when a contact zone of the top plate associated with the each of the plurality of capacitors is deflected by a force applied on the contact zone;
a reference capacitor having an upper reference surface and a lower reference surface in the housing to compensate an error in the measurement based on an environmental condition; and
at least one contact zone cavity formed on a bottom surface of the top plate, and wherein the upper conductive surface is formed on each of the at least one contact zone cavity.
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Accused Products
Abstract
A multi-zone capacitive force sensing apparatus/method is disclosed. In one embodiment, an apparatus includes one or more capacitors each having an upper conductive surface and a lower conductive surface substantially parallel to the upper conductive surface, a housing with a top plate and a bottom plate to encompass the capacitors, and a sensor in the housing to generate a measurement based on a change in a distance between the upper conductive surface and the lower conductive surface of each of the capacitors when a contact zone of the top plate associated with the each of the plurality of capacitors is deflected by a force applied on the contact zone. The apparatus may also include a comparison module associated with the sensor to generate a signal indicating unevenness of a force applied on the top plate when there is any significant difference between measurements of the capacitors.
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Citations
21 Claims
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1. An apparatus comprising:
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a plurality of capacitors each having an upper conductive surface and a lower conductive surface substantially parallel to the upper conductive surface; a housing with a top plate and a bottom plate to encompass the plurality of capacitors; a sensor in the housing to generate a measurement based on a change in a distance between the upper conductive surface and the lower conductive surface of each of the plurality of capacitors when a contact zone of the top plate associated with the each of the plurality of capacitors is deflected by a force applied on the contact zone; a reference capacitor having an upper reference surface and a lower reference surface in the housing to compensate an error in the measurement based on an environmental condition; and at least one contact zone cavity formed on a bottom surface of the top plate, and wherein the upper conductive surface is formed on each of the at least one contact zone cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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producing a deflection in each of a plurality of contact zones coupled to a top plate of a housing which encompasses a plurality of capacitors each having two parallel conductive surfaces when a load is applied on the plurality of contact zones; automatically generating a capacitance data from each of the plurality of capacitors when a distance between the two parallel conductive surfaces of the each of the plurality of capacitors is changed due to the deflection in the each of the plurality of contact zones; and modifying at least one attribute of the housing to change a deflection characteristic of the contact zones. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method in a form of a machine-readable medium embodying a set of instructions that, when executed by a machine, cause the machine to perform a method comprising:
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producing a deflection in each of a plurality of contact zones coupled to a top plate of a housing which encompasses a plurality of capacitors each having two parallel conductive surfaces when a load is applied on the plurality of contact zones; and automatically generating a capacitance data from each of the plurality of capacitors when a distance between the two parallel conductive surfaces of the each of the plurality of capacitors is changed due to the deflection in the each of the plurality of contact zones; and modifying at least one attribute of the housing to change a deflection characteristic of the contact zones.
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18. An apparatus comprising:
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a plurality of capacitors each having an upper conductive surface and a lower conductive surface substantially parallel to the upper conductive surface; a housing with a top plate and a bottom plate to encompass the plurality of capacitors; a sensor in the housing to generate a measurement based on a change in a distance between the upper conductive surface and the lower conductive surface of each of the plurality of capacitors when a contact zone of the top plate associated with the each of the plurality of capacitors is deflected by a force applied on the contact zone; a comparison module associated with the sensor to generate a signal data indicating unevenness of a force applied on the top plate when there is any significant difference between measurements of the plurality of capacitors; and an alarm module associated with the sensor to express a sensory data when a parameter of the signal data exceeds a threshold value.
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19. An apparatus comprising:
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a plurality of capacitors each having an upper conductive surface and a lower conductive surface substantially parallel to the upper conductive surface; a housing with a top plate and a bottom plate to encompass the plurality of capacitors, wherein the housing comprises three capacitors to form a three zone sensor to generate the measurement associated with at least one of the three capacitors; and a sensor in the housing to generate a measurement based on a change in a distance between the upper conductive surface and the lower conductive surface of each of the plurality of capacitors when a contact zone of the top plate associated with the each of the plurality of capacitors is deflected by a force applied on the contact zone.
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20. A method, comprising:
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producing a deflection in each of a plurality of contact zones coupled to a top plate of a housing which encompasses a plurality of capacitors each having two parallel conductive surfaces when a load is applied on the plurality of contact zones; automatically generating a capacitance data from each of the plurality of capacitors when a distance between the two parallel conductive surfaces of the each of the plurality of capacitors is changed due to the deflection in the each of the plurality of contact zones; comparing the capacitance data to determine a levelness of the load applied on the plurality of contact zones; and generating an alarm sound when the capacitance data is not substantially equal across the plurality of capacitors.
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21. A method, comprising:
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producing a deflection in each of a plurality of contact zones coupled to a top plate of a housing which encompasses a plurality of capacitors each having two parallel conductive surfaces when a load is applied on the plurality of contact zones; automatically generating a capacitance data from each of the plurality of capacitors when a distance between the two parallel conductive surfaces of the each of the plurality of capacitors is changed due to the deflection in the each of the plurality of contact zones; and creating a cavity on a bottom surface of the top plate opposite to each of the plurality of contact zones to form an upper conductive surface of the two parallel conductive surfaces.
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Specification