Variable angle flash with linear motor drive

Details Variable angle flash with linear motor drive Variable angle flash with linear motor drive

1994-03-21

1996-01-23

Mathews, A. A.

Illumination

Supported by vehicle structure

Condition responsive

362 18, 362285, G03B 1505

Patent

active

054868866

ABSTRACT:
A variable angle flash for a photographic camera has a flash tube and a reflector that are relatively movable along an optical axis. A linear motor in the camera drives a follower connected with one of the flash tube and reflector members for moving the flash tube (or reflector) along the axis to vary the illumination angle of the flash. Optionally, the motor is a linear form of ultrasonic wave motor of which the follower forms a movable portion. An elastic body engaging the follower and fixed to the camera case carries piezoelectric elements that undulate the body when subjected to ultrasonic alternating currents, causing the body to move the follower and drive the flash tube (or reflector) along the optical axis and thereby vary the illumination angle.

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New Ideas in Motion; PCIM, Apr. 1987, pp. 37-39.
Akiyama, Dr. Yuji; Present State of Ultrasonic Motors in Japan; Journal of Electrical Engineering (JEE), Apr. 1987, pp. 76-80, Dempa Publications, N.Y.
Ise. Yukihiko; Traveling Wave Ultrasonic Motors Offer High Conversion Efficiency. (Date Unknown).
Ultrasonic Motor, 17 pages, (Author and Date unknown).

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