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Journal of the SMPTE ( Volume: 78, Issue: 1, January 1969)
[ACTIVE]

An Automatic Rangefinder and Focus Control System

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
A method has been developed for automatic focusing. A light source emits a very narrow modulated beam of infrared rays toward the subject on which the lens is to be focused. The radiation diffused by the subject is caught by a receiver that forms an annular image, the axial position of which depends on the distance between the diffusing subject and the lens. That position is detected in the classical way by means of a pair of photoresistors tending to establish a state of mutual balance. The contrivance with the two photoresistors is linked to the focusing device of the lens through a simple cam and lever mechanism.
Publication Date
1969-01-01
DOI
10.5594/J06972
Link
https://doi.org/10.5594/J06972
Author(s)
Jean-Pierre Lavanchy, Giovanni B. Odone
Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J06972.json

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Jean-Pierre Lavanchy and Giovanni B. Odone; An Automatic Rangefinder and Focus Control System, Journal of the SMPTE ( Volume: 78, Issue: 1, January 1969); SMPTE, 1969. Available at https://doi.org/10.5594/J06972
Snippet:
Jean-Pierre Lavanchy and Giovanni B. Odone; An Automatic Rangefinder and Focus Control System, Journal of the SMPTE ( Volume: 78, Issue: 1, January 1969); SMPTE, 1969. Available at https://doi.org/10.5594/J06972

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Jean-Pierre Lavanchy and Giovanni B. Odone; An Automatic Rangefinder and Focus Control System, Journal of the SMPTE ( Volume: 78, Issue: 1, January 1969); SMPTE, 1969. Available at https://doi.org/10.5594/J06972
Snippet:
<span class="citation">Jean-Pierre Lavanchy and Giovanni B. Odone; <cite>An Automatic Rangefinder and Focus Control System</cite>, Journal of the SMPTE ( Volume: 78, Issue: 1, January 1969); SMPTE, 1969. Available at <a href="https://doi.org/10.5594/J06972" target="_blank" rel="noopener">https://doi.org/10.5594/J06972</a></span>

SMPTE Icon SMPTE's HTML Pub

Preview:
Jean-Pierre Lavanchy and Giovanni B. Odone; An Automatic Rangefinder and Focus Control System, Journal of the SMPTE ( Volume: 78, Issue: 1, January 1969); SMPTE, 1969
doi: 10.5594/J06972
url: https://doi.org/10.5594/J06972
Snippet:
<li>
Jean-Pierre Lavanchy and Giovanni B. Odone; <cite id="bib-10-5594-j06972">An Automatic Rangefinder and Focus Control System</cite>, Journal of the SMPTE ( Volume: 78, Issue: 1, January 1969); SMPTE, 1969
<span class="doi">10.5594/J06972</span>
</li>