Camera with means for coordinating aperture and focus adjustment

Details Camera with means for coordinating aperture and focus adjustment Camera with means for coordinating aperture and focus adjustment

1977-09-07

1979-05-15

Gellner, Michael L.

354196, 354198, G03B 708, G03B 1318

Patent

active

041545176

ABSTRACT:
A camera is provided that has an automatic focus detector and a manually operable focus adjustment device, in which the focus adjustment device can be set at a predetermined position or range falling outside of an ordinary focus adjusting range. At the same time a coordinating device is provided which functions to secure an appropriate depth of field (or a hyper focal range) by coordinating the focus adjustment and the exposure aperture adjustment when the focus adjustment device is set at the predetermined position or range. Thus even in a case when the focus detector can not function effectively, practically satisfactory photographing can be done by the action of the coordinating device.
In a preferred example of the present invention the focusing condition of a photo-taking lens system is automatically adjusted according to an exposure aperture value (i.e. f-stop value) by the action of the coordinating device in a condition in which the focus adjustment device is set at the predetermined position.
In another preferred example of the present invention, the size of the exposure aperture is automatically limited to a predetermined aperture size or smaller according to the set position of the lens system by the action of the coordinating device in a condition in which the focus adjustable device is set at a predetermined position or range.

REFERENCES:
patent: 3618499 (1971-11-01), Harvey
patent: 3962707 (1976-06-01), Galbraith, Jr.

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