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The Fischer Large-Screen Projection System
By E. BAUMANN
The paper describes the Fischer system of large-screen television projection which makes use of an "Eidophor" liquid. Consideration is given to the brightness requirements, and the principles of the schlieren optical system are discussed together with the manner in which the Eidophor functions. The technical problems involved are dealt with and the results obtained with the third prototype examined.
1. Introduction
There are many possibilities for the solution of the difficult problem of large-screen projection of television pictures, and it would almost be foolish to consider one or the other method as absolutely best. The system which is to be discussed here has been influenced from its beginnings by a clear and definite aim: the television picture should, in every respect, be of the same quality as the modern motion picture, i.e., of equal brightness, size, definition and gradation. I realize of course that this is a very ambitious aim and I would byno means maintain that it has already been reached at present. On the other
Presented at the Fifth Session of the 1951 Radio Convention on August 25 in the Cavendish Laboratory, Cambridge, England, by Prof. E. Baumann, Institut fur technische Physik an der E.T.H., Gloriastrasse 35, Zurich 7, Switzerland. Reprinted from the Journal of the British Institution of Radio Engineers, 12 (new series}: 69-78, Feb. 1952.
hand, I should like to make it clear that all our work has always been done with this aim in view. And as the development proceeds, the fundamental difficulties that might hinder the final success grow smaller and smaller.
You will allow me a short summing up of how the system has been developed so far. Professor Dr. F. Fischer applied for a patent for his basic ideas in November, 1939, and started their practical development in the AFIF (Department of Applied Physics of the Swiss Federal Institute of Technology, Section of Industrial Research). With his almost unlimited courage he tackled the underlying problems that had never been treated before. He constructed the first prototype of the projector which was first operated in the year 1 944. The results of this construction, however, were by no means encouraging and did not by far fulfil the hopes that were put in it. The difficulties, it is true, were not of such nature as to render any further pursuit of the idea absolutely hope
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April 195* Journal of the SMPTE Vol.60