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Canon Ultrasonic Motors (USMs)
11 August, 2004 - 14:00 — Chris
(Link updated Oct 2013)
Canon's brief description of their development of ultrasonic motors for use in camera auto-focus lenses. Their explanation of the arrangement of piezoelectric elements is particularly good. There are two sets of elements, offset by a quarter-wavelength, each generating a standing wave. Superimposing the offset standing waves creates a traveling wave that drives the rotor.
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