🚀 go-pugleaf

[ re: a question about a piezoelectric motor Canon built into the lens
  of a new camera]
In a recent issue of EE Times (I think...) there was a product announcement
of a small lightweight stepper motor that used a piezoelectric mechanism.
There was a picture that showed an inner and outer ring; no explanation but
from the looks of it I guessed that they used something conceptually similar
to a ratchet mechanism, where on each pulse of the transducer the ring moves
(say) clockwise, and something prevents it from ever moving CCW. Thus, even
a very small forward motion per pulse could add up to reasonable rotation
rates at ultrasonic modulation frequencies. Anyway, these doohickeys are
available off-the-shelf now. Seems like there could be *scads* of applications
for them.
	Doug