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2. 发明授权

US3868702A Mirror reflex camera 失效
标题翻译：镜反射相机
公开(公告)号：US3868702A
公开(公告)日：1975-02-25
申请号：US41635573
申请日：1973-11-16
申请人： ROLLEI WERKE FRANKE HEIDECKE
发明人： STRAUSS KARL-PETER , WEISS RICHARD
IPC分类号： G03B7/085 , G03B9/02
CPC分类号： G03B7/085
摘要： A mirror reflex camera of the type in which a diaphragm adjusting member is driven from maximum diaphragm aperture position toward minimum aperture position, and in which a photocell receiving light through the lens and the diaphragm is part of an electronic circuit which stops the closing down movement of the diaphragm aperture adjusting member when the photocell senses that the diaphragm has reached the proper aperture for the intended photographic exposure. The invention relates particularly to the brake which stops the movement of the diaphragm adjusting mechanism when the aperture is at the proper point. A rotating disk which is part of the adjusting mechanism normally has a very small air gap from the poles of an electromagnet. When the magnet is energized, it draws the disk into actual contact with the poles of the magnet, forming an effective quick-acting brake. The electronic circuit is adjusted to energize the electro-magnet shortly before the diaphragm reaches the desired aperture, to compensate for the unavoidable time lag in operation of even a quick-acting brake of this kind, so that when the movement is stopped by the brake, the aperture will be at the desired value.
摘要翻译：一种镜面反光照相机，其中膜片调节构件从最大光阑孔径位置朝向最小孔径位置驱动，并且其中通过透镜和隔膜接收光的光电管是停止关闭运动的电子电路的一部分当光电管感测到光阑已经到达用于预期照相曝光的适当光圈时，光阑孔径调节部件。本发明尤其涉及当孔径在适当位置时阻止膜片调节机构运动的制动器。作为调整机构的一部分的旋转盘通常具有与电磁体的磁极非常小的气隙。当磁体通电时，它将磁盘吸入与磁体的极实际接触，形成有效的快速制动。电子电路被调节以在光阑到达期望的孔之前不久激励电磁体，以补偿即使是这种快速制动的操作中不可避免的时间滞后，使得当制动器停止运动时，光圈将处于所需的值。

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