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Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 1, January 1949)
[ACTIVE]

Wide-Track Optics for Variable-Area Recorders

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
Wide variable-area sound tracks that meet Academy Research Council dimensional specification1 RC-5001 have the advantage that they yield an improvement in ratio of signal to noise. The optical system for the new RCA Type PR-31 de luxe recording machine is equipped to make sound tracks to this standard. RCA recorders of earlier types can also be converted to record tracks to this standard. The optics that provide this feature are confined to the slit and objective lens assembly and involve no extensive changes in the optical system. They consist primarily of an objective lens of new design that provides additional magnification in the direction of the slit length to meet the RC-5001 standard. When systems of earlier types are converted, a new slit and objective-lens barrel are installed, but no other optical changes are required. The converted system will produce all types of area tracks that could be made before conversion, and may be equipped for phototube monitoring.
Publication Date
1949-01-01
DOI
10.5594/J12571
Link
https://doi.org/10.5594/J12571
Author(s)
L. T. Sachtleben
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L. T. Sachtleben; Wide-Track Optics for Variable-Area Recorders, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 1, January 1949); SMPTE, 1949. Available at https://doi.org/10.5594/J12571
Snippet:
L. T. Sachtleben; Wide-Track Optics for Variable-Area Recorders, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 1, January 1949); SMPTE, 1949. Available at https://doi.org/10.5594/J12571

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L. T. Sachtleben; Wide-Track Optics for Variable-Area Recorders, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 1, January 1949); SMPTE, 1949. Available at https://doi.org/10.5594/J12571
Snippet:
<span class="citation">L. T. Sachtleben; <cite>Wide-Track Optics for Variable-Area Recorders</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 1, January 1949); SMPTE, 1949. Available at <a href="https://doi.org/10.5594/J12571" target="_blank" rel="noopener">https://doi.org/10.5594/J12571</a></span>

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Preview:
L. T. Sachtleben; Wide-Track Optics for Variable-Area Recorders, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 1, January 1949); SMPTE, 1949
doi: 10.5594/J12571
url: https://doi.org/10.5594/J12571
Snippet:
<li>
L. T. Sachtleben; <cite id="bib-10-5594-j12571">Wide-Track Optics for Variable-Area Recorders</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 1, January 1949); SMPTE, 1949
<span class="doi">10.5594/J12571</span>
</li>