Patent
1987-11-23
1989-01-17
Adams, Russell E.
354402, 3541951, 35419511, G03B 300
Patent
active
047990775
ABSTRACT:
The shutter blades of a scanning blade shutter and the movable element of an adjustable focus lens in a single lens reflex camera are actuated by a single or common drive. The scanning blade shutter is coupled to the common drive by a rotatably mounted beam member. The movable lens element is also coupled to the common drive through a drive link assembly and the same beam member. Actuation of the beam member by the common drive simultaneously moves the shutter blades in the single lens reflex camera toward their closed positions and moves the lens element coupled thereto by a drive link assembly toward a rangefinder-determined lens focal position. A solenoid coupled to a drive link in the drive link assembly and responsive to rangefinder-derived object distance signals actuates the drive link to uncouple the movable lens element from the beam member when the movable lens element has been moved to a particular focal position determined by the rangefinder. The common drive then moves the shutter blades to their full closed positions after the movable lens element has been uncoupled. The drive link connection between the beam member and the movable lens element is re-established subsequent to film exposure to thereby enable the common drive to return the movable lens element to its initial focal position while moving the shutter of the single lens reflex camera to its full open position.
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Kaplan Jonathan I.
Pero Stephen M.
Adams Russell E.
Kelleher John J.
Polaroid Corporation
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