An Aspheric Lens for Motion-Picture Projection

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: SMPTE J
Volume: 64, No. 8, pp. 409–412
Abstract: An aspheric lens is described which is designed to be added to the elliptical mirror-type projection optical system commonly used with carbon-arc light sources. The aspheric lens is designed to reduce the effects of the inherent foreshortening of those crater images formed by the outer zones of an elliptical mirror of large collection angle. Measurements using a sample aspheric lens with an f/2.25 mirror showed an increased uniformity of both screen color and brightness distribution at the expense of a reduction in light on the screen. The addition of the lens substantially reduced the variations in screen color that accompany changes in crater position. The aspheric lens can be combined with a faster mirror to give the same screen light as with a slower mirror alone, but with an improved color and brightness distribution.
Publication Date: 1955-08-01
DOI: 10.5594/J11307
ISSN: Print: 0898-0438
Link: https://doi.org/10.5594/J11307
Author(s): R. E. HarringtonNational Carbon Co., Box 6087, Cleveland, Ohio
Copyright: © 1955 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

Color Measurement of Motion Picture Screen Illumination [Active]
Motion Picture Screen Light as a Function of Carbon-Arc-Crater Brightness Distribution [Active]
3. Bowditch F. T. Null M. R. , “Selected ordinates for computing trichromatic coefficients and candlepower of a light source,” J. Opt. Soc. Am. , 28 : 500 , 1938 . EXTERNAL
4. Judd D. B. , “A Maxwell Triangle yielding uniform chromaticity scales,” J. Opt. Soc. Am. , 25 : 24 , 1935 . EXTERNAL
5. Judd D. B. , “Estimation of chromaticity differences and nearest color temperature on the Standard ICI Colorimetric Coordinate System,” J. Opt. Soc. Am. , 26 : 421 , 1936 . EXTERNAL

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R. E. Harrington; An Aspheric Lens for Motion-Picture Projection, SMPTE Journal ( Volume: 64, Issue: 8, August 1955); SMPTE, 1955. Available at https://doi.org/10.5594/J11307

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R. E. Harrington; An Aspheric Lens for Motion-Picture Projection, SMPTE Journal ( Volume: 64, Issue: 8, August 1955); SMPTE, 1955. Available at https://doi.org/10.5594/J11307

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R. E. Harrington; An Aspheric Lens for Motion-Picture Projection, SMPTE Journal ( Volume: 64, Issue: 8, August 1955); SMPTE, 1955. Available at https://doi.org/10.5594/J11307

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<span class="citation">R. E. Harrington; <cite>An Aspheric Lens for Motion-Picture Projection</cite>, SMPTE Journal ( Volume: 64, Issue: 8, August 1955); SMPTE, 1955. Available at <a href="https://doi.org/10.5594/J11307" target="_blank" rel="noopener">https://doi.org/10.5594/J11307</a></span>

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R. E. Harrington; An Aspheric Lens for Motion-Picture Projection, SMPTE Journal ( Volume: 64, Issue: 8, August 1955); SMPTE, 1955
doi: 10.5594/J11307
url: https://doi.org/10.5594/J11307

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R. E. Harrington; <cite id="bib-10-5594-j11307">An Aspheric Lens for Motion-Picture Projection</cite>, SMPTE Journal ( Volume: 64, Issue: 8, August 1955); SMPTE, 1955
<span class="doi">10.5594/J11307</span>
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