Automatic focusing system

Details Automatic focusing system Automatic focusing system

1978-07-06

1979-11-20

Hix, L. T.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250204, G03B 1320

Patent

active

041748921

ABSTRACT:
A method and apparatus for automatically focusing a camera is described in which the camera has a stationary optical path and a scanning optical path for developing focusing signals. The scanning optical path is caused to undergo a range-finding reciprocation in which it reciprocates between first and second limit positions, as between the minimum lens focusing position and the infinite lens focusing position. Two focusing signals are generated during the range-finding reciprocation and the interval between the focusing signals is used to derive the distance to the subject. The lens is then positioned in accordance with the derived distance to the subject.

REFERENCES:
patent: 4010479 (1977-03-01), Nobusawa
patent: 4059756 (1977-11-01), Wilwerding

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