Lens drive mechanism using an electro-mechanical transducer

Details Lens drive mechanism using an electro-mechanical transducer Lens drive mechanism using an electro-mechanical transducer

1995-07-06

1997-05-27

Ben, Loha

Optical: systems and elements

Lens

With support

359824, 359826, 359601, G02B 702

Patent

active

056337639

ABSTRACT:
An apparatus for driving a collapsible lens mount having several telescoping segments includes, for each movable segment, a transducer that expands and contracts responsive to a wave pulse and a drive shaft coupled to the transducer. By varying the wave pulse conditions, the expansion and contraction are made to occur at different rates. A coupling member on each segment frictionally engages the drive shaft and transmits movement of the drive shaft during relatively slow drive shaft movements to the lens segment. The apparatus may also include a lens hood driven by the transducer and drive shaft apparatus of the invention.

REFERENCES:
patent: 4195243 (1980-03-01), Thaxter
patent: 4607913 (1986-08-01), Jansen
patent: 4894579 (1990-01-01), Higuchi et al.
patent: 4912493 (1990-03-01), Tanaka
patent: 5225941 (1993-07-01), Saito et al.
patent: 5272567 (1993-12-01), Inoue
patent: 5365373 (1994-11-01), Tanaka
patent: 5406417 (1995-04-01), Denvenyi

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