Automatic lap dissolve for motion picture cameras
Abstract
Abstract AUTOMATIC LAP DISSOLVE MECHANISMS ARE PROVIDED IN MOTION PICTURE CAMERAS HAVING AN ELECTRONIC FILM DRIVE, A DIAPHRAGM WITH LEAVES POSITIONED IN THELIGHT PATH OF THE CAMERA, CURRENT CONTROLLED DIAPHRAGM CONTROL MEANS COUPLED TO THE DIAPHRAGM AND PHOTO RESISTOR MEANS POSITIONED IN THE LIGHT PATH FROM AN OBJECT TO BE PHOTOGRAPHED AND CONNECTED TO THE DIAPHRAGM CONTROL MEANS FOR VARYING THE MAGNITUDE OF CURRENT IN THE DIAPHRAGM CONTROL MEANS AND THEREBY VVARYING THE OPENING OF THE DIAPHRAGM IN ACCORDANCE WITH THE INTENSITY OF LIGHT IN THE LIGHT PATH FROM THE OBJECT TO BE PHOTOGRAPHED. THE AUTOMATIC LAP DISSOLVE MECHANISM INCLUDES: (A) TWWO ELECTRICAL CONTACTS ACTUATED BY THE DIAPHRAGM LEAVES MOVING INTO THEIR CLOSED POSITION TO EFFECT A REVERSAL OF THE POLARITY OF THE CAMERA MOTOR, (B) SWITCHING MEANS ARRANGED IN THE CIRCUIT OF THE CAMERA MOTOR, AND (C) A TIMER WHICH IS ACTUATED AT THE BEGINNING OF THE CAMERA MOTOR REVERSAL OF POLARITY AND OPERATES THE SWITCHING MEANS AFTER A PREDETERMINED PERIOD OF TIME HAS ELAPSED TO INTERRUPT THE CURRENT FLOW TO THE CAMERA MOTOR.
Inventors
- 👤 Heinz Keiner
Bibliographic Details
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