Patent ID: 11880031
Assignee: APPLE INC.
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 10:
11. A method for rotational control, comprising:
attaching a gimbal to a frame by first hinges disposed along a first axis so that the gimbal rotates on the first hinges about the first axis relative to the frame;
attaching a rotating element to the gimbal by second hinges disposed along a second axis, perpendicular to the first axis, so that the rotating element rotates on the second hinges about the second axis relative to the gimbal;
disposing one or more strain sensors on at least one of the first hinges so as to provide a signal indicative of a rotation of the rotating element about the second axis relative to the gimbal; and
monitoring the rotation of the rotating element about the second axis responsively to the signal.