Automatic focussing apparatus

Details Automatic focussing apparatus Automatic focussing apparatus

1977-11-30

1979-07-03

Demeo, Palmer C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G01J 136, G03B 708

Patent

active

041601599

ABSTRACT:
An automatic focussing apparatus comprises a first drive element for repeatedly oscillating a movable reflecting mirror of an optical system of the range finder type, a second drive element for moving a focussing lens, a first signal generating component for producing a first signal when the amounts of light received by a stationary reflecting mirror and the movable reflecting mirror of the optical system are equal to each other, a second signal generating component for producing a second signal indicative of the position of the focussing lens, and a decision component for deciding the direction in which the focussing lens is to be moved in accordance with the relative timing of the first and the second signals.

REFERENCES:
patent: 4080531 (1978-03-01), Stauffer
patent: 4085320 (1978-04-01), Wilwerding

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