Transactions of the Society of Motion Picture Engineers ( Volume: 7, Issue: 16, May 1923)

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A Split Aspheric Condensing Lens

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: Trans. SMPE
Volume: 7, No. 16, pp. 212–224
Abstract: One of the immediate results of the introduction of the high current incandescent lamp into the motion picture industry has been the emphasis placed upon an old problem of applied optics; that is, the production of a field of uniform illumination from a non-uniform light source. The crater of the carbon are, which preceded the incandescent lamp in projection service, is sufficiently uniform in brilliancy from edge to edge to give an almost constant illumination at all parts of the screen, but the incandescent filament not only varies in brightness in different parts but it has open spaces of about half the filament area in extent. The illumination at the aperture and on the screen has a natural tendency to show an image of the filament, and the suppression of this image is the problem with which we are here concerned.
Publication Date: 1923-05-01
DOI: 10.5594/J11639
ISSN: Print: 0096-6460
Link: https://doi.org/10.5594/J11639
Author(s): Frank BenfordPhysicist, Illuminating Engineering Laboratory. General Electric Co.
Copyright: © 1923 Society of Motion Picture and Television Engineers, Inc.

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Frank Benford; A Split Aspheric Condensing Lens, Transactions of the Society of Motion Picture Engineers ( Volume: 7, Issue: 16, May 1923); SMPTE, 1923. Available at https://doi.org/10.5594/J11639

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Frank Benford; A Split Aspheric Condensing Lens, Transactions of the Society of Motion Picture Engineers ( Volume: 7, Issue: 16, May 1923); SMPTE, 1923. Available at https://doi.org/10.5594/J11639

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Frank Benford; A Split Aspheric Condensing Lens, Transactions of the Society of Motion Picture Engineers ( Volume: 7, Issue: 16, May 1923); SMPTE, 1923. Available at https://doi.org/10.5594/J11639

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<span class="citation">Frank Benford; <cite>A Split Aspheric Condensing Lens</cite>, Transactions of the Society of Motion Picture Engineers ( Volume: 7, Issue: 16, May 1923); SMPTE, 1923. Available at <a href="https://doi.org/10.5594/J11639" target="_blank" rel="noopener">https://doi.org/10.5594/J11639</a></span>

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Frank Benford; A Split Aspheric Condensing Lens, Transactions of the Society of Motion Picture Engineers ( Volume: 7, Issue: 16, May 1923); SMPTE, 1923
doi: 10.5594/J11639
url: https://doi.org/10.5594/J11639

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Frank Benford; <cite id="bib-10-5594-j11639">A Split Aspheric Condensing Lens</cite>, Transactions of the Society of Motion Picture Engineers ( Volume: 7, Issue: 16, May 1923); SMPTE, 1923
<span class="doi">10.5594/J11639</span>
</li>