Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2011-08-02
2011-08-02
Phan, James (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S199300, C359S213100, C359S214100, C359S198100
Reexamination Certificate
active
07990596
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.
REFERENCES:
patent: 2007/0035799 (2007-02-01), Gomi et al.
patent: 09-97305 (1997-04-01), None
Ishida Daisuke
Shimizu Takeshi
Harness & Dickey & Pierce P.L.C.
Phan James
Seiko Epson Corporation
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