Automatic focus adjusting system

Details Automatic focus adjusting system Automatic focus adjusting system

1978-01-23

1979-06-05

Adams, Russell E.

Optics: motion pictures

Removable film strip magazine type

354195, 352140, G03B 300, G03B 708

Patent

active

041572173

ABSTRACT:
Disclosed is an improvement in an automatic focusing system for use with an optical instrument having a focusable objective which is adjustable in response to optical and electronic components of the system for determining object distance of a remote subject by comparing images of scanning and reference optical systems. The scanner of the optical system is driven oscillatably across an angle to detect a subject between infinity and the minimum focus condition of the objective lens. The scanner is adjustable in response to the focus condition of the lens for alignment of the angle scanned with the subject when the lens is in perfect focus by means of an electronic and mechanical interconnecting feedback between the lens focusing ring and the aiming device for the scanning system.
The present invention relates to improvements in an automatic focusing system's for use with an optical instrument having a focusable objective. More particularly, the improvement relates to controlling the focusing system sensitivity in accordance with the various camera conditions which define depth of field e.g. object luminance, film sensitivity, shutter speed, focal length and the like.

REFERENCES:
patent: 4093365 (1978-11-01), Isono

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