Force sensor with uniform response in an axis
First Claim
Patent Images
1. An input device comprising:
- an input surface having a first axis and a second axis, the input surface having a non-uniform bending response when a force is applied; and
a plurality of force sensor electrodes, the plurality of force sensor electrodes having a cumulative capacitive sensor response to the force on the input surface,wherein deflections of the plurality of force sensor electrodes in response to the force are non-uniform due to the non-uniform bending response of the input surface,wherein the cumulative capacitive sensor response is, within a specified tolerance, uniform along the first axis based on a plurality of sizes of the plurality of force sensor electrodes,wherein the cumulative capacitive sensor response is a weighted sum of a plurality of force measurements obtained from the plurality of force sensor electrodes along the first axis, the weighted sum being independent from a positional coordinate of the force being applied with respect to the first axis, andwherein the independency from the positional coordinate results from a first subset of the plurality of force sensor electrodes being of heterogeneous sizes to compensate for the non-uniform deflections.
3 Assignments
0 Petitions
Accused Products
Abstract
An input device includes an input surface having a first axis and a second axis, and force sensor electrodes. The force sensor electrodes have a cumulative capacitive sensor response to a force on the input surface. The cumulative capacitive sensor response is, within a specified tolerance, uniform along the first axis based on the plurality of sizes of the plurality of force sensor electrodes.
77 Citations
18 Claims
-
1. An input device comprising:
-
an input surface having a first axis and a second axis, the input surface having a non-uniform bending response when a force is applied; and a plurality of force sensor electrodes, the plurality of force sensor electrodes having a cumulative capacitive sensor response to the force on the input surface, wherein deflections of the plurality of force sensor electrodes in response to the force are non-uniform due to the non-uniform bending response of the input surface, wherein the cumulative capacitive sensor response is, within a specified tolerance, uniform along the first axis based on a plurality of sizes of the plurality of force sensor electrodes, wherein the cumulative capacitive sensor response is a weighted sum of a plurality of force measurements obtained from the plurality of force sensor electrodes along the first axis, the weighted sum being independent from a positional coordinate of the force being applied with respect to the first axis, and wherein the independency from the positional coordinate results from a first subset of the plurality of force sensor electrodes being of heterogeneous sizes to compensate for the non-uniform deflections. - View Dependent Claims (2, 3, 4, 5)
-
-
6. An input device comprising:
-
an input surface having a first axis, a second axis substantially orthogonal to the first axis, and a corner, the input surface having a non-uniform bending response when a force is applied; and a plurality of force sensor electrodes, the plurality of force sensor electrodes comprising; a first sensor electrode adjacent to the corner, and a second sensor electrode located farther from the corner along the first axis than the first sensor electrode, the second sensor electrode being smaller than the first sensor electrode, wherein a deflection of the first sensor electrode in response to the force is different from a deflection of the second sensor electrode, due to the non-uniform bending response of the input surface, and wherein sizes of the first and second sensor electrodes are selected to obtain a uniform cumulative capacitive sensor response in presence of the non-uniform deflections, wherein the cumulative capacitive sensor response is a weighted sum of force measurements obtained from at least the first and the second sensor electrodes along the first axis, the weighted sum being independent from a positional coordinate of the force being applied with respect to the first axis, and wherein the independency from the positional coordinate results from the first and the second sensor electrodes being of heterogeneous sizes to compensate for the non-uniform deflections. - View Dependent Claims (7, 8, 9, 10, 11)
-
-
12. A processing system for an input device, the processing system comprising:
-
sensor circuitry configured to be coupled to a plurality of positional sensor electrodes, and a plurality of force sensor electrodes, the sensor circuitry configured to; obtain a plurality of force measurements from the plurality of force sensor electrodes, wherein deflections of the plurality of force sensor electrodes in response to a force being applied to an input surface of the input device are non-uniform due to a non-uniform bending response of the input surface, and obtain a plurality of positional measurements from the plurality of positional sensor electrodes, wherein the plurality of force sensor electrodes has a cumulative capacitive sensor response that is substantially uniform along a first axis of the input surface, wherein the cumulative capacitive sensor response is a weighted sum of the plurality of force measurements along the first axis, the weighted sum being independent from a positional coordinate of the force being applied with respect to the first axis, and wherein the independency from the positional coordinate results from a first subset of the plurality of force sensor electrodes being of heterogeneous sizes to compensate for the non-uniform deflections; and a processing circuitry configured to; determine, using the plurality of force measurements, the cumulative capacitive sensor response, and determine, using the cumulative capacitive sensor response, force information. - View Dependent Claims (13, 14, 15, 16, 17, 18)
-
Specification