Automatic focus adjusting device

Details Automatic focus adjusting device Automatic focus adjusting device

1978-02-02

1979-05-29

Hix, L. T.

Optics: motion pictures

Removable film strip magazine type

352140, 250201, G03B 310, G01J 120

Patent

active

041565630

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 present invention relates to improvements in an automatic focusing system for use with an optical instrument having a focusable objective. More particularly, the improvement relates to driving the focusing system to a preset fixed focus setting when the system senses difficult conditions for focus detection as those having low contrast or complex subject matter.

REFERENCES:
patent: 3958117 (1976-05-01), Stauffer
patent: 4002899 (1977-01-01), Stauffer
patent: 4045805 (1977-08-01), Saito

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