Focus detecting system

Details Focus detecting system Focus detecting system

1974-11-01

1976-12-21

Hartary, Joseph W.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, 352140, 356 4, G03B 300

Patent

active

039991920

ABSTRACT:
In the system disclosed, a cylindrical lens or mirror compresses the image of an object illuminated by a beam, and a movable mirror coupled to the lens barrel of a lens system reflects the compressed image onto the dividing line between two photosensors. The unbalance between the outputs of the photosensors indicates the defocus of the lens system. A servo responds to the unbalance to refocus the system by moving the lens barrel and the mirror until the photosensor outputs are balanced.

REFERENCES:
patent: 3249006 (1966-05-01), Stauffer
patent: 3442193 (1969-05-01), Pagel
patent: 3603800 (1971-09-01), Andres et al.
patent: 3610934 (1971-10-01), Turner
patent: 3652784 (1972-03-01), Wupper et al.
Camera's Infrared Eye Focuses on New Vistas for Ranging; Electronics, vol. 43, No. 9, Apr. 1970, pp. 102-105.

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