| 摘要 |
An automatic focusing device for cameras projects from the camera to an object to be photographed a spot of light whose intensity is modulated. The light reflected by the object is received by a range-finding lens and this received light is divided to form two images on two photoelectric effect elements, respectively, through an optical system which produces the two images with an apparent parallax except when the object is sharply in focus. The range-finding lens is movable with the phototaking lens and is shifted back and forth by the signal output from the photoelectric effect elements which signal varies depending upon whether or not the images on both photoelectric effect elements are free from apparent parallax.
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