Optical: systems and elements – Deflection using a moving element – By moving a reflective element
Reexamination Certificate
2007-05-24
2008-11-04
Cherry, Euncha P (Department: 2872)
Optical: systems and elements
Deflection using a moving element
By moving a reflective element
Reexamination Certificate
active
07446920
ABSTRACT:
An optical deflector arranged to be relatively stably driven regardless of any environmental disturbance such as temperature, includes an oscillating system160having plural natural oscillation modes of different frequencies, a driving unit for driving the oscillating unit, and a drive control unit for supplying a driving signal to the driving unit, the oscillating system160including a first oscillator movable element11with a light deflecting element22, a first torsion spring12, a second oscillator movable element13, a second torsion spring12and a supporting member15, the optical deflector further including a distortion detecting element25aand25bfor detecting mechanical deformation of the first and/or second torsion spring and a heat generating element19, for stabilizing the frequencies of the natural oscillation modes and the state of scan to ensure stable sinusoidal-wave combined drive.
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Furukawa Yukio
Kato Takahisa
Shimada Yasuhiro
Canon Kabushiki Kaisha
Cherry Euncha P
Fitzpatrick ,Cella, Harper & Scinto
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