Automatic focus adjusting system

Patent

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Details

G03B 708

Patent

active

041463161

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.
A warning device is included to be activated thereby cautioning the operator that the automatic focus system has reached its operational limit. However, the repeated occurrences of irregular or error signals must be present before the warning device will operate.

REFERENCES:
patent: 4091275 (1978-05-01), Wilwerding

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