Lens driving device employing vibration motor with backlash comp

Details Lens driving device employing vibration motor with backlash comp Lens driving device employing vibration motor with backlash comp

1994-09-29

1996-02-20

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

354400, H02N 214, G03B 300

Patent

active

054931630

ABSTRACT:
A driving device drives a movable member, such as a lens barrel, using a vibration motor through a gear train. The scanning speed of the driving frequency of a periodic signal applied to the motor when the motor is activated is varied according to a backlash of the gear train. In this manner, a movable member can be driven to effect a fine focus adjustment regardless of the existence or non-existence of a backlash in the gear train.

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