Vibration wave motor control apparatus, vibration wave motor...

Details Vibration wave motor control apparatus, vibration wave motor... Vibration wave motor control apparatus, vibration wave motor...

2007-08-13

2008-09-09

Dougherty, Thomas M (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S317000

Reexamination Certificate

active

07423361

ABSTRACT:
A vibration wave motor control apparatus which has a simplified construction and is reduced in cost. In a photographic apparatus including a lens, a lens position controller controls the position of the lens using a vibration wave motor driven by a drive voltage of a set frequency, and a drive-frequency controller controls the set frequency. The drive-frequency controller determines an estimated frequency based on a change in the position of a movable unit of the vibration wave motor determined from data inputted from an encoder, and based on the estimated frequency, calculates an updated value of the set frequency and inputs the same to the lens position controller.

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