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本文提出一种补偿式高速摄影机用的新原理——双反射镜补偿原理,这种新的补偿原理是R.R.Campbell发明的专利的改进。它的优点是: (1) 对摄影物镜的固有像质无影响; (2) 像面中心在理论上无像移和离焦,扫描像点和胶片完全同步,在最大理论快门系数为1:1时,可以做到完全补偿。 (3) 易于实现补偿转鼓和输片轮的同轴结构,使机构产生的有损像质的因素减至最小。根据这原理设计的补偿式高速摄影机,当快门系数为1:1,胶片鉴别率为85对线/毫米时,在画幅中心部份可得到摄影鉴别率为60线/毫米,画幅边缘像高H=9毫米处的摄影鉴别率为30对线/毫米。
This paper presents a new principle for compensated high-speed cameras - the principle of double mirror compensation. This new compensation principle is an improvement of the patent invented by R.R. Campbell. Its advantages are: (1) It has no influence on the intrinsic quality of the photographic objective; (2) The center of the image plane is theoretically free of image shift and defocusing. The scanning image point and the film are completely synchronized. The maximum theoretical shutter coefficient is 1: 1, can be completely compensated. (3) It is easy to compensate the coaxial structure of the drum and the sprocket to minimize the damage to the image quality caused by the mechanism. According to this principle, the compensated high-speed camera designed with the shutter speed of 1: 1 and the film discrimination rate of 85 pairs / mm can obtain the photograph discrimination rate of 60 lines / mm at the center of the frame, Photographic identification rate = 9 mm at 30 pairs of lines / mm.