Videoscope—A High-Gain, Color Television Screen-Process System

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: For broadcasting monochrome TV programs, Japan Broadcasting Corp. (NHK) has been using a screen process in which video signals are projected by Eidophor. When these programs were to be rebroadcast in color, it was found that the screen brightness was insufficient for the color camera; therefore, color slides were used. However, this method also proved inadequate, because, although it required considerable time and effort to improve the brightness, the pictures turned out unsatisfactory in other respects. To overcome this, the “Lumiscope” was developed in 1967. The Lumiscope is a 1010- × 1320-mm lens made of sheet plastic which is capable of focusing the light from the projector into the camera without reducing the side-edge luminance. At the same time, it ensures a gain some hundreds of times greater than that obtainable from a conventional screen. This high-gain screen has been incorporated in a system called the “Videoscope,” consisting of camera, lens screen, and a projection-type color TV receiver which contains three picture tubes (one for each primary color) and red- and blue-reflecting dichroic mirrors. With the Videoscope system, it is possible to project any arbitrary color video signal with high brightness, at low cost, and under stable operation.
Publication Date: 1970-06-01
DOI: 10.5594/J10680
Link: https://doi.org/10.5594/J10680
Author(s): Tanji Kishino

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Tanji Kishino; Videoscope—A High-Gain, Color Television Screen-Process System, Journal of the SMPTE ( Volume: 79, Issue: 6, June 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J10680

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Tanji Kishino; Videoscope—A High-Gain, Color Television Screen-Process System, Journal of the SMPTE ( Volume: 79, Issue: 6, June 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J10680

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Tanji Kishino; Videoscope—A High-Gain, Color Television Screen-Process System, Journal of the SMPTE ( Volume: 79, Issue: 6, June 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J10680

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<span class="citation">Tanji Kishino; <cite>Videoscope—A High-Gain, Color Television Screen-Process System</cite>, Journal of the SMPTE ( Volume: 79, Issue: 6, June 1970); SMPTE, 1970. Available at <a href="https://doi.org/10.5594/J10680" target="_blank" rel="noopener">https://doi.org/10.5594/J10680</a></span>

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Tanji Kishino; Videoscope—A High-Gain, Color Television Screen-Process System, Journal of the SMPTE ( Volume: 79, Issue: 6, June 1970); SMPTE, 1970
doi: 10.5594/J10680
url: https://doi.org/10.5594/J10680

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Tanji Kishino; <cite id="bib-10-5594-j10680">Videoscope—A High-Gain, Color Television Screen-Process System</cite>, Journal of the SMPTE ( Volume: 79, Issue: 6, June 1970); SMPTE, 1970
<span class="doi">10.5594/J10680</span>
</li>