Automatic focusing apparatus

Details Automatic focusing apparatus Automatic focusing apparatus

1978-05-30

1979-06-26

Gellner, Michael L.

354 31, G03B 708, G03B 1302

Patent

active

041591690

ABSTRACT:
Disclosed is an improvement in an automatic focusing system for use with an ptical 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 optically correcting the images transmitted via the optical system to overcome problems of asymmetry of image position and/or intensity.

REFERENCES:
patent: 3614921 (1971-10-01), Yamanaka et al.
patent: 4002899 (1977-01-01), Stauffer

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