Dual scanning focusing system

Details Dual scanning focusing system Dual scanning focusing system

1976-10-01

1978-02-21

Gonzales, John

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, G03B 708

Patent

active

040756394

ABSTRACT:
A mechanism is provided for producing a dual scan of a scene containing an object to be automatically focused upon by the image producing means of an optical system. A first mirror is caused to sweep through a scene containing the object in a first direction and then back through the scene in the opposite direction. Radiation from the scene is presented to the range determining apparatus of an automatic focusing system which produces an output signal during the scan in the opposite direction which output signal is representative of the distance to the object. The output signal is used to stop the image producing means of the optical system in the desired position for proper focus.

REFERENCES:
patent: 3367254 (1968-02-01), Townsley
patent: 3442193 (1969-05-01), Pagel
patent: 3618499 (1971-11-01), Harvey
patent: 3720148 (1973-03-01), Harvey

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