Invention Grant
- Patent Title: Mirror device drive control apparatus and projector
- Patent Title (中): 镜面装置驱动控制装置和投影机
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Application No.: US12749549Application Date: 2010-03-30
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Publication No.: US07990596B2Publication Date: 2011-08-02
- Inventor: Takeshi Shimizu , Daisuke Ishida
- Applicant: Takeshi Shimizu , Daisuke Ishida
- Applicant Address: JP
- Assignee: Seiko Epson Corporation
- Current Assignee: Seiko Epson Corporation
- Current Assignee Address: JP
- Agency: Harness, Dickey & Pierce, P.L.C.
- Priority: JP2009-088718 20090401; JP2010-033236 20100218
- Main IPC: G02B26/08
- IPC: G02B26/08

Abstract:
A mirror device drive control apparatus adapted to perform drive control of a mirror device having a hysteresis characteristic, includes: a drive section adapted to drive the mirror device with a drive signal; a detection section adapted to detect a displacement of a movable section of the mirror device, and to generate and then output a detection signal corresponding to the detection; a control section adapted to perform control of a frequency of the drive signal so that the movable section is displaced in a predetermined range; and an abnormality detection section adapted to detect abnormal vibration of the movable section during the control by the control section, wherein the abnormality detection section detects, in response to change in frequency of the drive signal, a frequency of an envelope included in the abnormal vibration of the movable section as a beat frequency based on a detection signal of the detection section, and obtains a frequency of the drive signal for performing a restoration process of driving of the mirror device based on the frequency of the drive signal changed and the beat frequency.
Public/Granted literature
- US20100253989A1 MIRROR DEVICE DRIVE CONTROL APPARATUS AND PROJECTOR Public/Granted day:2010-10-07
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