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1. 发明授权

US4498747A Motion picture camera 失效
标题翻译：电影摄影机
公开(公告)号：US4498747A
公开(公告)日：1985-02-12
申请号：US519484
申请日：1983-08-01
申请人： Bennie R. Brothers
发明人： Bennie R. Brothers
IPC分类号： G03B1/22 , G03B9/10 , G03B41/04
CPC分类号： G03B1/22 , G03B9/10
摘要： A motion picture camera includes a film pull down mechanism and shutter in which film is moved from one frame to the next in a 360.degree. operating cycle made up of a pull down time and a dwell time. The film pull down mechanism is designed to pull the film down in a period less than the dwell time of the film so that film exposure is increased over that occurring when the pull down time and dwell times are equal. The shutter has an opaque sector less than 180.degree. and an open sector greater than 180.degree. responsive to operation of the pull down mechanism to eclipse the film from exposure during the pull down time. The film pull down mechanism further includes a means for varying the length of film pulled down so that film frames of different vertical dimensions can be properly exposed by the same motion picture camera.
摘要翻译：电影摄像机包括胶片下拉机构和快门，其中胶片在由下拉时间和停留时间组成的360度操作周期中从一帧移动到下一帧。膜下拉机构被设计成在小于膜的停留时间的时间内将膜下拉，使得当下拉时间和停留时间相等时，胶片曝光增加。快门具有小于180度的不透明扇区和响应于下拉机构的操作的大于180度的开口扇区，以在下拉时间期间遮盖膜曝光。胶片下拉机构还包括用于改变下拉的胶片的长度的装置，使得具有不同垂直尺寸的胶卷框可以通过相同的运动相机适当曝光。

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