Position detection of mechanical resonant scanner mirror

Details Position detection of mechanical resonant scanner mirror Position detection of mechanical resonant scanner mirror

1996-09-25

1997-12-02

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359212, 359213, 359223, 359900, 250234, G02B 2608

Patent

active

056942370

ABSTRACT:
Two piezoelectric sensors are mounted on the back of a spring-plate of a mechanical resonance scanner on respective sides of a center line coinciding with an axis of rotation. As the scanner mirror rotates back and forth the two sensors are accelerated and decelerated at a 180.degree. phase difference. Each sensor's output voltage crosses a zero level when the acceleration is unchanging. A differential amplifier detects the zero crossings for motion along the axis of rotation. Common mode rejection eliminates the non-rotational accelerations associated with external vibrations and shocks, and prevents masking the mirror's zero-crossings.

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