Motion Based Capacitive Sensor System
First Claim
1. A proximity sensing system comprising:
- a conductive first trace; and
a conductive second trace adjacent to, interleaved with, and electrically isolated from the first trace, wherein a density of the traces varies along a first axis such that rates of change of capacitance between the traces associated with movement, through an electric field, of an object in a direction of the first axis at a constant velocity are indicative of the direction.
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Abstract
A proximity sensing system may include a conductive first trace and a conductive second trace adjacent to, interleaved with, and electrically isolated from the first trace. A density of the traces varies along a first axis such that rates of change of capacitance between the traces associated with movement, through an electric field, of an object in a direction of the first axis at a constant velocity are indicative of the direction. The sensing system may further include a conductive third trace adjacent to, interleaved with, and electrically isolated from the first trace. A first area between the first trace and second trace is independent of and isolated from a second area between the first trace and the third trace. Also, a density of the first and third traces may vary along the first axis.
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Citations
19 Claims
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1. A proximity sensing system comprising:
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a conductive first trace; and a conductive second trace adjacent to, interleaved with, and electrically isolated from the first trace, wherein a density of the traces varies along a first axis such that rates of change of capacitance between the traces associated with movement, through an electric field, of an object in a direction of the first axis at a constant velocity are indicative of the direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A controller-implemented method comprising:
outputting by the controller a first signal based on rates of change of capacitance between a first and second trace of a capacitive sensor pad having a first trace density gradient along a first axis within a first area such that the first signal is indicative of a direction of movement of an object through an electric field associated with the capacitive sensor pad at a constant velocity along the first axis. - View Dependent Claims (10, 11, 12, 13)
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14. A proximity sensing system comprising:
first and second traces electrically isolated from each other and defining a pattern having a trace density that varies along an axis perpendicular to an axis of asymmetry of the pattern such that rates of change of capacitance between the first and second traces associated with movement through an electric field of an object at a constant velocity in a direction perpendicular to the axis are indicative of the direction. - View Dependent Claims (15, 16, 17, 18, 19)
Specification