Optical: systems and elements – Deflection using a moving element – By moving a reflective element
Patent
1998-01-20
1999-11-09
Phan, James
Optical: systems and elements
Deflection using a moving element
By moving a reflective element
359198, 359199, 359213, 359214, 359223, G02B 2608
Patent
active
059825286
ABSTRACT:
A piezoelectric circuit drives mirror movement along a scan path. The scanner includes a support, a reflective surface and a piezoelectric circuit. The support alternately rotates about an axis of rotation in a first direction and a second direction. The reflective surface moves with the support. The piezoelectric circuit is mechanically coupled to the support, and includes a first piezoelectric volume and a second piezoelectric volume. During a first portion of a drive cycle drive signals of opposite polarity cause the volumes to deform in opposing manner. The deformation causes the support to rotate in the first direction. During a second portion of the drive cycle the polarity of the drive signals switches again causing the volumes to deform, but in opposite manner than during the first portion of the drive cycle. The deformation causes the support to rotate in the second direction.
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Koda Steven P.
Phan James
University of Washington
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