Range finder for still or moving picture cameras
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 8, 1981
Grant Date -
N/A
app pub date -
Nov 29, 1979
filing date -
Dec 14, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To measure the distance to a selected object, the range finder transmits infrared light in a beam having a straight limiting edge on one side. The object reflects light back from the illuminated region and a lens receives part of the light and creates an image of the illuminated region including the straight limiting edge on a plane inclined at an angle to the optical axis of the lens. A detector, including a photoelectric transducer part of which is masked by a mask having a straight edge, is moved along the plane until the edge of the mask and the edge of the image are aligned as closely as possible. The position of the detector when this alignment takes place is indicative of the distance of the object from the range finder.
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