Power focus device for a camera

Details Power focus device for a camera Power focus device for a camera

1996-12-23

1997-10-14

Adams, Russell E.

Photography

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

Manually actuated power focus

396 86, G03B 310, G03B 1334

Patent

active

056780745

ABSTRACT:
A power focus device for a camera provides a user-friendly lever interface allowing efficient camera operation. A lever, located outside a camera cover, is movable in two opposing directions but is biased to remain at a neutral position between two extremes of movement. Moving the lever from the neutral position initiates driving the camera lens to focus in either a first or a second direction according to a direction of a displacement of the lever from the neutral position. A speed of focusing is proportional to an amount of displacement of the lever from the neutral position, thus permitting variable high and low speed focusing in both directions for rapid and accurate close-up and infinity focussing. Incorporating a seal into the device permits use in underwater camera applications.

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