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Journal of the Society of Motion Picture Engineers ( Volume: 51, Issue: 5, November 1948)
[ACTIVE]

Variable-Area Light-Valve Modulator

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
A variable-area modulator is described which employs a ribbon light valve as the basic modulating element. Double-width push-pull, variable-area sound track or standard width dulateral sound track may be recorded at will by inserting the appropriate light valve into the modulator. The light valve is registered in place in the modulator by indexing dowels and securely locked by means of lever-controlled clamping springs. The light-valve ribbons are oriented so as to be parallel to the direction of motion of the film. The ribbon edges are projected at ten times magnification onto the film to define the amplitude co-ordinate of the recording image while the image height is determined by a narrow rectangular stop which is imaged onto the film at a 70:1 reduction in height by a cylindrical lens system. The modulator is a completely self-contained unit embodying the basic components for the recording optical system, an optical system for rear projecting an enlarged image of the ribbon aperture onto a viewing screen, a photoelectric monitoring system, and an exposure meter.
Publication Date
1948-11-01
DOI
10.5594/J11723
Link
https://doi.org/10.5594/J11723
Author(s)
Lewis B. Browder
Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J11723.json

Reference this Doc

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Lewis B. Browder; Variable-Area Light-Valve Modulator, Journal of the Society of Motion Picture Engineers ( Volume: 51, Issue: 5, November 1948); SMPTE, 1948. Available at https://doi.org/10.5594/J11723
Snippet:
Lewis B. Browder; Variable-Area Light-Valve Modulator, Journal of the Society of Motion Picture Engineers ( Volume: 51, Issue: 5, November 1948); SMPTE, 1948. Available at https://doi.org/10.5594/J11723

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Lewis B. Browder; Variable-Area Light-Valve Modulator, Journal of the Society of Motion Picture Engineers ( Volume: 51, Issue: 5, November 1948); SMPTE, 1948. Available at https://doi.org/10.5594/J11723
Snippet:
<span class="citation">Lewis B. Browder; <cite>Variable-Area Light-Valve Modulator</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 51, Issue: 5, November 1948); SMPTE, 1948. Available at <a href="https://doi.org/10.5594/J11723" target="_blank" rel="noopener">https://doi.org/10.5594/J11723</a></span>

SMPTE Icon SMPTE's HTML Pub

Preview:
Lewis B. Browder; Variable-Area Light-Valve Modulator, Journal of the Society of Motion Picture Engineers ( Volume: 51, Issue: 5, November 1948); SMPTE, 1948
doi: 10.5594/J11723
url: https://doi.org/10.5594/J11723
Snippet:
<li>
Lewis B. Browder; <cite id="bib-10-5594-j11723">Variable-Area Light-Valve Modulator</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 51, Issue: 5, November 1948); SMPTE, 1948
<span class="doi">10.5594/J11723</span>
</li>