Canon Ultrasonic Motors (USMs)

11 August, 2004 - 14:00 — Chris

Article Url:

www.canon.com/technology/canon_tech/explanation/usm.html

(Link updated March 2008)

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.

Supplier link:

Canon Inc

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