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

A Higher-Efficiency Condensing System for Picture Projectors

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
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
Link
https://doi.org/10.5594/J12947
Author(s)
F. E. Carlson
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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
Snippet:
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
Snippet:
<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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Preview:
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
doi: 10.5594/J12947
url: https://doi.org/10.5594/J12947
Snippet:
<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>