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公开(公告)号：US10365476B2
公开(公告)日：2019-07-30
申请号：US15643164
申请日：2017-07-06
Applicant: STMicroelectronics Ltd
Inventor： Guy Amor , Offir Duvdevany
Abstract: Mirror control circuitry described herein is for controlling a first micro-mirror of a micro-mirror apparatus that scans across a target area in a scan pattern. The mirror control circuitry includes a processor that determines a mechanical angle of the first micro-mirror for a given instant in time during scanning of the first micro-mirror between upper and lower rotational limits, the mechanical angle being such to maintain the scan pattern as being uniform while the micro-mirror apparatus scans across the target area between the upper and lower rotational limits. The processor also generates a driving signal for the first micro-mirror as a function of the determined mechanical angle for the first micro-mirror at the given instant in time.
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公开(公告)号：US10365474B2
公开(公告)日：2019-07-30
申请号：US15613455
申请日：2017-06-05
Applicant: STMicroelectronics Ltd
Inventor： Offir Duvdevany , Naomi Petrushevsky
Abstract: Disclosed herein is a mirror controller for an oscillating mirror. The mirror controller includes a processor configured to receive a mirror sense signal from the oscillating mirror and to determine a phase error between the mirror sense signal and a mirror drive signal. The processor determines the phase error by sampling the mirror sense signal at a first time, sampling the mirror sense signal at a second time at which the mirror sense signal is expected to be equal to the mirror sense signal as sampled at the first time, and generating the phase error as a function of a difference between the sample of the mirror sense signal at the second time and the sample of the mirror sense signal at the first time.
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公开(公告)号：US20190101744A1
公开(公告)日：2019-04-04
申请号：US15722444
申请日：2017-10-02
Applicant: STMicroelectronics Ltd
Inventor： Sivan Kinstlich , Offir Duvdevany
IPC: G02B26/08
Abstract: Described herein is a device including mirror control circuitry for controlling a movable mirror. The mirror control circuitry includes drive circuitry for providing a drive signal to the movable mirror, and a processor. The processor cause the drive circuitry to generate the drive signal so as to have pulses with leading edges occurring an offset period of time after a maximum opening angle of the movable mirror and trailing edges occurring an offset period of time before a zero crossing of the movable mirror. The processor may sample a mirror sense signal from the movable mirror at times at which a derivative of capacitance of the movable mirror with respect to time is zero, and then perform an action based upon the samples.
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公开(公告)号：US20180024351A1
公开(公告)日：2018-01-25
申请号：US15723529
申请日：2017-10-03
Applicant: STMicroelectronics Ltd
Inventor： Offir Duvdevany
CPC classification number: G02B26/0833 , G01D5/24 , G01D5/243 , G02B26/105
Abstract: A device disclosed herein includes a feedback measuring circuit to measure a signal flowing through a movable MEMS mirror. Processing circuitry determines a time at which the signal indicates that a capacitance of the movable MEMS mirror is substantially at a maximum capacitance. The processing circuitry also determines, over a window of time extending from the time at which the signal indicates that the capacitance of the movable MEMS mirror is substantially at the maximum to a given time, a total change in capacitance of the movable MEMS mirror compared to the maximum capacitance. The processor further determines the capacitance at the given time as a function of the total change in capacitance, and determines an opening angle of the movable MEMS mirror as a function of the capacitance at the given time.
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