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1 June 1991 New design of the illuminating system for transmission film copy
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There are a number of illuminating system for film copy based on the well known dichroic mirrors and electromagnetic slits -- valves. Light of a lamp illuminator is reflected separately on two mirrors (red and blue) and thus the third green channel is subtracted. Intensity of light in each channel is controlled by electromagnetic valve and then the final color is formed in the exit slit behind a tappered lightguide by mixing of the three principal colors. The new design of an illuminator working in a pulse mode being introduced in this paper is maintained with no mechanically moving parts. Principal part of the new illuminator is a cube-formed electro- optic modulator. The new illuminator operates at higher frequency of color modulation, with higher energy transmission (by 50% over the classical illuminator), and with the setting of greater number of color modes (73 intensity levels of each principal color). Moreover there is more compact design of the illuminating module over the one with mirrors and the new module can be easily connected with a computer control.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ales A. Pesl "New design of the illuminating system for transmission film copy", Proc. SPIE 1448, Camera and Input Scanner Systems, (1 June 1991);

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