Canon developed the world's first ultrasonic motor (USM) as the drive motor for the autofocus function incorporated in its EF lenses for EOSseries single-lens reflex cameras.
Ultrasonic motors work on the principle that a stator (the elastic body) subject to vibration results in friction that turns a rotor (the moving body). Small vibrations are repeatedly employed to induce motion, making possible low-speed movement with considerable force without needing a reduction gear mechanism. This type of motor produces higher torque than a similar-sized conventional electromagnetic motor, and provides the same amount of torque with smaller dimensions. Major features of ultrasonic motors include highly precise operation and low noise.

In addition to ring-type ultrasonic motors, Canon has also developed pencil-type micro motors, which are also used in digital camera zoom lenses. Canon aims to use ultrasonic motors in a variety of products, capitalizing on their special characteristics, which include compact size, quiet operation, and high precision.