Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 2, August 1938)

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A Higher-Efficiency Condensing System for Picture Projectors

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 31, No. 2, pp. 187–193
Abstract: In motion picture projection optical systems for tungsten-filament sources, the condenser design is such that the source is imaged well ahead of the picture aperture. This position is dictated by considerations of uniformity of screen brightness. It is not the optimal position from the standpoint of utilization of light, for it entails losses at the aperture. At the best position for efficiency, the degree of brightness uniformity is inacceptable because of the non-uniform brightness of the source. The paper describes a method for reducing such losses without sacrificing picture quality.
Publication Date: 1938-08-01
DOI: 10.5594/J12947
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J12947
Author(s): F. E. CarlsonGeneral Electric Co., Cleveland, Ohio.
Copyright: © 1938 Society of Motion Picture and Television Engineers, Inc.

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F. E. Carlson; A Higher-Efficiency Condensing System for Picture Projectors, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 2, August 1938); SMPTE, 1938. Available at https://doi.org/10.5594/J12947

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F. E. Carlson; A Higher-Efficiency Condensing System for Picture Projectors, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 2, August 1938); SMPTE, 1938. Available at https://doi.org/10.5594/J12947

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<span class="citation">F. E. Carlson; <cite>A Higher-Efficiency Condensing System for Picture Projectors</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 2, August 1938); SMPTE, 1938. Available at <a href="https://doi.org/10.5594/J12947" target="_blank" rel="noopener">https://doi.org/10.5594/J12947</a></span>

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<li>
F. E. Carlson; <cite id="bib-10-5594-j12947">A Higher-Efficiency Condensing System for Picture Projectors</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 2, August 1938); SMPTE, 1938
<span class="doi">10.5594/J12947</span>
</li>