Patent
1980-03-24
1982-08-17
Wintercorn, Richard A.
354199, G03B 1318, G03B 1302
Patent
active
043446868
ABSTRACT:
A photographic still or motion-picture camera has a viewfinder and a manually moved focus adjuster, such as a focussing ring. When the user peers into the viewfinder, there is a visible indication of the direction in which the focus adjuster should be manually moved to reduce the state-of-focus error, for example two curved illuminated errors, one pointing clockwise and the other counterclockwise, only one of which lights up to indicate the direction in which the focussing ring should be manually turned. When the state-of-focus error has been reduced to zero or a minimum, this is likewise indicated, for example because neither curved arrow is illuminated. To control the activation of the indicating elements, use can be made of components of a conventional completely automatic focussing system, but minus the adjusting motor of such system and minus superfluous motor-energization control circuitry. In this way, the user is provided a simple and unequivocal guide when manually focussing, without the cost, complexity, bulkiness and power consumption of a complete automatic focussing system including an adjusting motor and motor-energization control circuitry.
REFERENCES:
patent: 3682071 (1972-08-01), Hosoe
patent: 3906389 (1975-09-01), Matsumoto
patent: 4117325 (1978-09-01), Holle et al.
Cocron Istvan
Lermann Peter
Stemme Otto
Agfa-Gevaert Aktiengesellschaft
Striker Michael J.
Tarcza Thomas H.
Wintercorn Richard A.
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