Lens apparatus

Details Lens apparatus Lens apparatus

1998-06-22

2000-06-13

Adams, Russell

Photography

Having variable focal length of camera objective

Power zoom

396133, 396135, 396136, 396261, G03B 1700

Patent

active

060759453

ABSTRACT:
The present invention relates to a lens apparatus employed in a video camera. The present invention provides a lens apparatus, suited to manipulation of an operator, using a vibratory wave motor as a driving source for driving a photographing lens of the lens apparatus, wherein on the occasion of change of a driving direction, application of cyclic signals to a piezoelectric device of the motor is suspended and thereafter application of cyclic signals to the piezoelectric device is restarted.

REFERENCES:
patent: 4794294 (1988-12-01), Shimizu et al.
patent: 4896179 (1990-01-01), Watanabe et al.
patent: 4984000 (1991-01-01), Watanabe et al.

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