Camera focus adjusting device for moving an imaging unit

Details Camera focus adjusting device for moving an imaging unit Camera focus adjusting device for moving an imaging unit

1999-01-15

2000-05-23

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Lens drive circuit or motor structure

G03B 1334

Patent

active

060674210

ABSTRACT:
A focus adjusting device which includes an imaging unit, such as a lens group, a film, a charge coupled device, a CMOS sensor, etc., and at least one electrostriction unit deforming based on an applied voltage and configured to move the imaging unit from the deforming. Further, positioned between the imaging unit and the at least one electrostriction unit is a mechanism for increasing or accumulating the deforming of the at least one electrostriction unit. The electrostriction unit can take the form of a laminate piezoelectric device. In one specific embodiment, the mechanism provided between the imaging unit and the at least one electrostriction unit is a lever which increases the deforming of the at least one electrostriction unit. In another embodiment, at least two electrostriction units are utilized and the mechanism provided between the at least two electrostriction units and the imaging unit is a coupling between the at least two electrostriction units which accumulates the deforming of each of the at least two electrostriction units. According to a further embodiment, the mechanism provided between the imaging unit and the at least one electrostriction unit is an elastic member with curved portions which increase the deforming of the at least one electrostriction unit in a direction perpendicular to a direction of the deforming of the at least one electrostriction unit.

REFERENCES:
patent: 4291958 (1981-09-01), Frank et al.
patent: 4601539 (1986-07-01), Watanabe et al.
patent: 4868597 (1989-09-01), Tanaka et al.

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