Distance measurement apparatus for camera, and distance measurem

Details Distance measurement apparatus for camera, and distance measurem Distance measurement apparatus for camera, and distance measurem

1992-05-27

1994-05-03

Perkey, W. B.

G03B 1336

Patent

active

053090721

ABSTRACT:
An auto-focus apparatus for a camera includes a distance measurement unit for projecting infrared light toward an object, receiving the infrared light reflected by the object, and outputting a signal according to an object distance. A control unit operates the distance measurement unit twice at a predetermined time interval. A discrimination unit discriminates on the basis of two output signals output from the distance measurement unit whether or not the object is moving to the near distance side by an amount equal to or larger than a predetermined amount. An arithmetic unit converts the output signals from the distance measurement unit into an extension amount of a photographing lens. The arithmetic unit adds a predetermined value to the extension amount when the discrimination unit discriminates that the object is moving to the near distance side.

REFERENCES:
patent: 5136148 (1992-08-01), Nonaka

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