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热词
    • 7. 发明授权
    • Optical attachment for viewing a focusing screen of a camera
    • 用于查看摄像机聚焦屏幕的光学附件
    • US3701582A
    • 1972-10-31
    • US3701582D
    • 1971-01-08
    • SINAR AG SCHAFFHAUSEN
    • KOCH CARL
    • G03B19/12G02B27/04G02B23/18G02B23/20
    • G03B19/12
    • AN OPTICAL ATTACHMENT FOR VIEWING THE FOCUSING SCREEN OF A LARGE-SIZE FOCUSING SCREEN CAMERA. THE ATTACHMENT COMPRISES A LIGHT-TIGHT BELLOWS STRUCTURE INCLUDING A PAIR OF SPACED, OPPOSED END FRAMES INTERCONNECTED BY A FLEXIBLE BELLOWS. ONE OF HE FRAMES IS ADAPTED TO BE RELEASABLY ATTACHED TO A FOCUSING SCREEN AND A PLATE HAVING A VIEWING WINDOW THEREIN IS MOUNTED ON THE OTHER FRAME. A BINOCULAR OPTICAL MAGNIFYING SYSTEM IS MOUNTED ON THE PLATE ADJACENT THE VIEWING WINDOW. THE BINOCULAR SYSTEM IS SELECTIVELY SWINGABLE ON THE PLATE BETWEEN AN OPERATIVE VIEWING POSITION IN FRONT OF SAID WINDOW AND AN INOPERATIVE POSITION AWAY FROM THE WINDOW. THE OPTICAL ATTACHMENT INCLUDES AN EXTERNAL LEVER WHICH IS OPERABLY CONNECTED WITH THE BINOCULAR SYSTEM FOR MOVING THE BINOCULAR SYSTEM BETWEEN ITS OPERATIVE AND INOPERATIVE POSITIONS. THE ATTACHMENT ALSO INCLUDES A TUNNEL-SHAPED SHIELD HAVING SPACED, OPPOSED OPEN ENDS. ONE OF THE ENDS OF THE SHIELD BEING RELEASABLY SECURED TO THE PLATE IN SURROUNDING RELATIONSHIP TO THE WINDOW AND THE OTHER END BEING SHAPED TO COMPLEMENTALLY ACCOMODATE THE HEAD OF A PHOTOGRAPHER. THE BELLOWS IS RELATIVELY SELF-SUPPORTING AND LATERALLY AND LONGITUDINALLY FLEXIBLE TO ALLOW BOTH PERPENDICULAR AND PARALLEL MOVEMENT OF THE PLATE AND THE SHIELD RELATIVE TO THE FOCUSING SCREEN.