| 摘要 |
PURPOSE:To provide a film pressing plate mechanism constituted so that a film is held at a photographing aperture part by fixed pressure regardless of the position of a movable block, the appearance of a camera is miniaturized and the loading and the exchanging operation of film is easily executed with the sense of a conventional camera as for a back focusing control system automatic focusing single lens reflex camera constituted so that the fixed block of a camera main body is constituted of a block box and the movable block is housed inside. CONSTITUTION:One end of a pressing plate holding plate 27 to which a pressing plate 19 is fixed is pivotally fixed to the spool 12 side of a main body movable part 11. Near the outside rails 46 and 47 of the aperture part, permanent magnets 32, 36, 39 and 43 and yokes 33, 34, 37, 38, 40, 41, 42 and 44 are embedded. Besides, the upper and the lower ends of the plate 19 are provided with attraction wave type electromagnetic iron pieces 35 and 20. In such a state that a back cover 26 is closed, the film is held at the aperture part by the plate 19 by the attraction force of the magnets. When the cover 26 is opened in order to exchange the film, the plate 19 is drawn apart from the aperture part with hinges 23 and 24 and the like. Then, the film can be exchanged. |
