Focusing system and method with adjustment for lens depth of foc

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G03B 310

Patent

active

043623727

ABSTRACT:
A focusing system and method for a photographic camera providing an automatic adjustment in the focus setting of the camera lens with aperture size to exploit the increased depth of focus available with a reduction in aperture size. In the illustrated embodiment, the aperture size is determined in accordance with scene light level, and the focus setting of the lens for a given camera/subject distance, as determined by an acoustical range finder, is adjusted automatically one or more positional increments toward the infinity focus setting of the lens to shift the in-focus field of the lens farther from the camera, in response to available subject illumination.

REFERENCES:
patent: 3522764 (1970-08-01), Biber et al.
patent: 3618499 (1971-11-01), Harvey
patent: 4065778 (1977-12-01), Harvey
patent: 4157217 (1979-06-01), Isono
patent: 4167316 (1979-09-01), Johnson et al.
patent: 4199244 (1980-04-01), Shenk
patent: 4199246 (1980-04-01), Muggli
"Automatic Focusing by Echo Ranging in SX70 Cameras" by G. Crawley, Brit. Journal of Photography, Apr. 13, 1979.

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