Automatic focus control motive means

Details Automatic focus control motive means Automatic focus control motive means

1976-10-01

1977-05-03

Hix, L. T.

G03B 1318

Patent

active

040218210

ABSTRACT:
A mechanism is provided for driving the scanning device of an automatic optical focusing system and for moving the primary optical element of such system to the desired focus position. A cam and cam follower arrangement is connected between a drive motor and the scanning device to cause the scanning device to sweep through a scene containing an object to be focused upon and to transmit radiation from such scene to the correlation optics of the system. The output of the correlation optics is processed to produce a signal indicative of the direction which the primary optical element must be moved in order to achieve the desired focus position. A bidirectional moving device is connected between the drive motor and the primary optical element and is operable in accordance with the signal to move the primary optical element in the proper direction.

REFERENCES:
patent: 3435744 (1969-04-01), Stimson
patent: 3442193 (1969-05-01), Pagel
patent: 3639048 (1972-02-01), Heaney et al.
patent: 3958117 (1976-05-01), Stauffer

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