Actuator built-in apparatus with ultrasonic wave actuators drive

Details Actuator built-in apparatus with ultrasonic wave actuators drive Actuator built-in apparatus with ultrasonic wave actuators drive

1995-08-25

1997-10-14

Mathews, A. A.

Photography

Camera shake sensing

Having stabilization system

396133, 396261, 396358, 396387, 310316, 310323, 318116, G03B 100, G03B 500, G03B 708, H01L 4108

Patent

active

056780702

ABSTRACT:
An apparatus such as a camera, etc. incorporates at least first and second ultrasonic wave actuators driven at predetermined frequencies for driving the apparatus. The first and second ultrasonic wave actuators are drive-controlled at different frequencies by first and second actuator drive portions controlled by an apparatus control portion. The first and second ultrasonic wave actuators are constructed to satisfy a relationship such as .vertline.f1-f2.vertline.>4000, where f1 (Hz) is the drive frequency of the first ultrasonic wave actuator, and f2 (Hz) is the drive frequency of the second ultrasonic wave actuator. Prevented thus are drawbacks caused when simultaneously driving the plurality of ultrasonic wave actuators for driving the apparatus, i.e., a resonance in an apparatus structural body and a resultant "beat" phenomenon.

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patent: 5371427 (1994-12-01), Goto et al.
patent: 5440212 (1995-08-01), Fukui
patent: 5467158 (1995-11-01), Murashima et al.

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