An Electronically Controlled Additive Lamp House for Optical Printers

Metadata

Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The J-K Camera Engineering LH-3 additive lamp house employs closed-loop electronic control circuitry to regulate color balance and overall exposure for optical printers. The closed-loop control system automatically compensates for errors due to aging, dust accumulation, and manufacturing variations. Additive lamp house opto-mechanical design is simplified, resulting in lower costs. The electronic circuits have interfaces to allow control by an exernal computer. A dichroic mirror assembly is used to separate and recombine the three primary colors from three projection lamps. Neutral density wedges positioned by a motor are used to regulate overall exposure. Color is adjusted by varying voltage applied to the lamps by circuits which compare the light output intensity, measured with photosensors, to the desired intensity values, entered on switches or directly as input from a computer. Overall light is controlled in a similar manner, the light intensity being varied by the motorized wedges. The LH-3 utilizes linear scales for color and exposure values. Logarithmic scales may be converted to linear by straightforward calculations. When controlled by a computer, these conversions are made automatically, and the unit may be made to emulate any color and exposure system.
Publication Date: 1980-09-01
DOI: 10.5594/J00445
Link: https://doi.org/10.5594/J00445
Author(s): Howard S. Moscovitz

Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J00445.json

Reference this Doc

Plain text (ISO 690 compliant)

Preview:

Howard S. Moscovitz; An Electronically Controlled Additive Lamp House for Optical Printers, SMPTE Journal ( Volume: 89, Issue: 9, September 1980); SMPTE, 1980. Available at https://doi.org/10.5594/J00445

Snippet:

Howard S. Moscovitz; An Electronically Controlled Additive Lamp House for Optical Printers, SMPTE Journal ( Volume: 89, Issue: 9, September 1980); SMPTE, 1980. Available at https://doi.org/10.5594/J00445

HTML (ISO 690 compliant)

Preview:

Snippet:

<span class="citation">Howard S. Moscovitz; <cite>An Electronically Controlled Additive Lamp House for Optical Printers</cite>, SMPTE Journal ( Volume: 89, Issue: 9, September 1980); SMPTE, 1980. Available at <a href="https://doi.org/10.5594/J00445" target="_blank" rel="noopener">https://doi.org/10.5594/J00445</a></span>

SMPTE's HTML Pub

Preview:

Howard S. Moscovitz; An Electronically Controlled Additive Lamp House for Optical Printers, SMPTE Journal ( Volume: 89, Issue: 9, September 1980); SMPTE, 1980
doi: 10.5594/J00445
url: https://doi.org/10.5594/J00445

Snippet:

<li>
Howard S. Moscovitz; <cite id="bib-10-5594-j00445">An Electronically Controlled Additive Lamp House for Optical Printers</cite>, SMPTE Journal ( Volume: 89, Issue: 9, September 1980); SMPTE, 1980
<span class="doi">10.5594/J00445</span>
</li>