公开(公告)号：US4209238A

公开(公告)日：1980-06-24

申请号：US900352

申请日：1978-04-26

申请人： David G. Stites ,  John R. Flint ,  Michael L. Kreuser

发明人： David G. Stites ,  John R. Flint ,  Michael L. Kreuser

IPC分类号： G03B21/11 ,  G03B21/20 ,  G03B23/12

CPC分类号： G03B21/113

摘要： A film transport mechanism moves film from area to area and then stops it to project an image. During the period while the film is being transported, the lens is shuttered and glass flats on either side of the film are opened. This way, the viewer does not see a blurred montage of images being moved across a screen at a high rate of speed, and there is a much less chance of scratching film. The shutter may be either a mechanical blade which cuts across a beam of light or an electrical circuit which dims a light supply to darken the screen. Dimming is preferred to switching a lamp off or on since it is much less damaging to a filament if it remains continuously energized.

摘要翻译： 电影传输机制将影片从一个区域移动到另一个区域，然后停止投影影像。 在胶片运输期间，镜头被关闭，胶片两侧的玻璃平板打开。 这样，观众看不到以高速率在屏幕上移动的图像的模糊蒙太奇，并且刮擦电影的机会要少得多。 快门可以是切割光束的机械叶片或者使灯光变暗以使屏幕变暗的电路。 将灯关闭或打开时，优选调光，因为如果灯丝保持连续通电，则对灯丝的损坏要小得多。