公开(公告)号：US10908361B2

公开(公告)日：2021-02-02

申请号：US16221523

申请日：2018-12-16

Applicant: APPLE INC.

Inventor： Sebastian Fluegel ,  Andrew J. Sutton ,  Bryce T Bradford ,  Yuval Gerson

IPC: G02B6/35 ,  G02B26/08 ,  G01P15/125

Abstract: An apparatus for driving and position sensing in a comb-drive actuator includes a generator, a driver circuit, sensing circuitry, and signal processing circuitry. The generator is configured to apply a sensing-voltage to a first electrode of the comb-drive actuator. The driver circuit is configured to apply a drive-voltage to a second electrode of the comb-drive actuator, having an opposite polarity relative to the first electrode. The sensing circuitry is configured to measure at the second electrode a sensed-waveform resulting from the sensing-voltage applied to the first electrode. The signal processing circuitry is configured to estimate a position of the first electrode relative to the second electrode based on the sensed-waveform.