Differential haptic guidance for personal navigation
First Claim
1. An adaptive system for measuring the angular position of a rotating shaft, the system comprising:
- a field source configured to generate a measurable field;
a sensor configured to measure the generated field; and
a target that is configured to modify the generated field as measured by the sensor to have a shape (a) with at least one measurable feature for a zero angular reference, and (b) that varies throughout one or more angles such that a rotational position of the shaft is determined according to a selected angular interval;
the adaptive system having a first mode of operation for self-calibrating the adaptive system to identify minimum and maximum values of the generated field measured by the sensor; and
the adaptive system having a second mode of operation using the minimum and maximum values to determine a corresponding angular position of the shaft relative to a preselected position;
wherein the system is configured to output information of the identified values to a control device to control operation of the shaft.
3 Assignments
0 Petitions
Accused Products
Abstract
One aspect of the technology involves a system for measuring the rotational position of a rotating shaft, including a field source configured to generate a measurable field, a sensor configured to measure the generated field, and a target that is configured to modify the generated field as measured by the sensor to have a shape with (a) at least one measurable feature for a zero reference point, and (b) a shape that varies throughout one or more angles such that a rotational position of the shaft is determined with a selected angular accuracy. There is also a device that receives a query for the rotational position of the shaft a device that responds to the query. Another aspect involves generating multi-frequency vibrations with a single linear resonant actuator (LRA). This LRA can exhibit a beat pattern in response to being driven by the sum of two different sinusoidal functions.
19 Citations
14 Claims
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1. An adaptive system for measuring the angular position of a rotating shaft, the system comprising:
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a field source configured to generate a measurable field; a sensor configured to measure the generated field; and a target that is configured to modify the generated field as measured by the sensor to have a shape (a) with at least one measurable feature for a zero angular reference, and (b) that varies throughout one or more angles such that a rotational position of the shaft is determined according to a selected angular interval; the adaptive system having a first mode of operation for self-calibrating the adaptive system to identify minimum and maximum values of the generated field measured by the sensor; and the adaptive system having a second mode of operation using the minimum and maximum values to determine a corresponding angular position of the shaft relative to a preselected position;
wherein the system is configured to output information of the identified values to a control device to control operation of the shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An angular position measurement system, comprising:
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a field emitter; a field detector; and a rotating target attached to a shaft of an object, the target configured to affect transmission of a field from the field emitter to the field detector, such that as the target rotates, variations in one or more aspects of shape, size and material composition of the rotating target produce correspondingly measurable changes in the field as detected by the field detector;
wherein the system is configured to output the measurable angular changes to a control device to control rotation of the shaft. - View Dependent Claims (13, 14)
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Specification