Automatic focus adjusting apparatus for camera

Details Automatic focus adjusting apparatus for camera Automatic focus adjusting apparatus for camera

1981-05-21

1984-01-10

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250214B, G03B 300, G01J 146

Patent

active

044250312

ABSTRACT:
The active automatic focusing apparatus disclosed scans the object to be photographed with light from a light projector and includes a sensor sensing reflected light, a peak detector for detecting the peak value of the signal sensed by the sensor, a control producing a stop signal suitable for stopping focusing movement of the objective lens in accordance with the output of the peak detector, and a stop device for stopping the movement of the objective lens on the basis of the output of the control. A comparator compares the level of the detected signal with that of a preset noise signal so as to produce a first control signal when the level of the detected signal is higher than that of the noise signal. A given distance detector produces a second control signal when the objective lens is moved to a predetermined position corresponding to a distance at which a peak of the detected signal can be detected by the peak detector. An arrangement applies a second stop signal to the stop device to stop the movement of the objective lens when the first and the second stop signals are produced.

REFERENCES:
patent: 3602826 (1971-08-01), List
patent: 3678835 (1972-07-01), Takishima
patent: 3988747 (1976-10-01), Lermann et al.
patent: 3999192 (1976-12-01), Hosoe et al.
patent: 4032934 (1977-06-01), Hendrickson

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