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[* black] To oscillate the mirror, alternating electrical current at high frequency is passed through a copper coil attached to the mirror. AnA stationary iron core is attached to the display unit, forming a [link|http://en.wikipedia.org/wiki/Solenoid|solenoid] to produce the motive force needed for oscillation.
[* black] To oscillate the mirror, alternating electrical current at high frequency is passed through a copper coil attached to the mirror. AnA stationary iron core is attached to the display unit, forming a [link|http://en.wikipedia.org/wiki/Solenoid|solenoid] to produce the motive force needed for oscillation.
[* black] To tell the oscillator circuitry how fast the mirror is moving, an arm attached to the mirror passes back and forth through an optical sensor attached to the lower circuit board.