Preset diaphragm for interchangeable lenses of single-lens mirror reflex cameras
Abstract
Abstract A PRESET DIAPHRAGM FOR AN INTERCHANGEABLE LENS OF A SINGLE-LENS MIRROR REFLEX CAMERA IN WHICH THE DIAPHRAGM IS CONTROLLED BY A MECHANISM IN THE CAMERA BODY HAVING A SHAFT DETACHABLY COUPLED IN THE EDGES OF THE LENS MOUNT WHICH ROTATES IN ONE DIRECTION DURING RELEASE OF THE CAMERA AND IN THE OPPOSITE DIRECTION DURING FILM TRANSPORT AND THIS ROTATIONAL MOVEMENT IS TRANSFERRED TO A SHAFT IN THE LENS WHICH OPENS AND CLOSES THE PRESET DIAPHRAGM BY TURNING THE DIAPHRAGM COVER. SPECIFICALLY, THE SHAFT IN THE LENS CARRIES A CAM DISC WHICH IS SPRING-LOADED AND PIVOTALLY MOUNTED ON ONE LEG OF AN ANGLE LEVER. THE OTHER LEG OF THE ANGLE LEVER IS RESILIENTLY CONNECTED WITH A GUIDE PLATE FOR THE DIAPHRAGM COVER. IN OPERATION, THE ANGLE LEVER AND GUIDE PLATE ARE TURNED RELATIVE TO ONE ANOTHER WHEN THE GUIDE PLATE MOVEMENT IS STOPPED AT THE PRESET APERTURE VALUE THUS ALLOWING THE CAM DISC TO COMPLETE ITS ROTATION BY THE MECHANISM IM THE CAMERA BODY.
Inventors
- 👤 A Alfredsson
Bibliographic Details
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