1 January 1992 New illuminating system design for transmission film copying
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A number of illuminating systems for film copying are based on well-known dichroic mirrors and electromagnetic slitsvalves. Light from a lamp iiluminator is reflected separately on two mirrors (red and blue) and the third green channel is subtracted. The intensity of the light in each channel is controlled by an electromagnetic valve, and the final color is formed in the exit slit behind a tapered lightguide by mixing of the three principal colors. A new design for an iiluminator that works in a pulse mode and has no mechanical moving parts is introduced. The principal part of the new illuminator is a cube-formed electro-optic modulator. The new illuminator operates at a higher frequency of color modulation, with higher energy transmission (higher by 50% than classical illuminators), and with a greater number of color modes (73 intensity levels for each principal color). Moreover the design of this new illuminating module is more compact than the one with mirrors, and the new module can be easily connected via computer control.
Ales A. Pesl, Ales A. Pesl, } "New illuminating system design for transmission film copying," Journal of Electronic Imaging 1(1), (1 January 1992). https://doi.org/10.1117/12.55175 . Submission:

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