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Instantaneous Theater Projection Television System
By VICTOR TRAD and RIGARDO MUNIZ
A new, inexpensive, instantaneous dual theater projection television system of the Schmidt type is described. A simple control box providing almost instantaneous change-over, in the event of breakdown, and mechanical arrangements facilitating ease of installation and maintenance are discussed.
STUDY of the needs of the motion picture theater owner and operator made over a period of many years, in connection with the development of this and earlier projection television units, has revealed the need for a thoroughly satisfactory and reliable theater projection television unit which will, at the same time, be substantially lower in cost than those others currently available, and which will be amenable to relatively simple installation techniques, and which can be supplied and kept in adjustment easily by the motion picture projection machine operator. This paper presents some of the technical and operational features of the present Trad theater television unit.
It will be seen that, in this typical installation (Fig. 1), the Trad dual unit rests upon a simple support bracket
Presented on April 21, 1952, at the Society's Convention at Chicago, 111., by Frank H. Riffle for the authors, Victor Trad and Ricardo Muniz, Trad Television Corp., 1001 First Ave., Asbury Park, NJ.
which, in turn, has been attached to the main balcony support of the theater.
This places the unit in the proper operating position with respect to the theater screen, and also provides maximum accessibility from the balcony of all adjustments and chassis for routine operation and maintenance.
Figure 2 shows how the two chassis, the low-voltage power supply with video amplifier and the high-voltage sweep chassis, are mounted with relation to the projection optical system, and also how accessible the units can be from the balcony without the use of ladders or scaffolding.
The various electronic adjustments are located in the rear of the highvoltage sweep chassis and, once made, need be checked only at infrequent intervals, but which are conveniently accessible from the balcony since they are on the side of the chassis nearest the balcony. It is important to note that this is the only place in the entire installation where any high voltage exists. It is not necessary to have elaborate high-voltage transmission sys
August 1952 Journal of the SMPTE Vol. 59
125