| 摘要 |
A distance-measuring device of this invention is characterized in that the distance measured by the PSDs is corrected on the basis of the direction and the amount of a spot light deviation obtained by a combination of three light-receiving elements that receives an asymmetrical spot, in order to prevent erroneous distance measuring due to spot light deviations in an infrared projection trigonometrical measurement system. With the present invention, the IRED projects a spot with protruding portions symmetrical and perpendicular to the base length, onto the subject. Then, the SPD of a first light-receiving section of a light-receiving element located the base length away from the IRED receives the protruding portions of the spot, and the SPD of a second light-receiving section receives the protruding portions. This allows the incident position of the reflected light from the object to be sensed. Based on the output of the SPDs of the light-receiving element, the AFIC computes the distance to the object.
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