| 摘要 |
A concave curved surface 95 is formed on a light inputting surface 93 of a light emitting lens 43 , and a convex curved surface 96 is formed on a light emitting surface 94 . Only laser light close to an optic axis A is inputted to the concave curved surface 95 , and a spread angle is enlarged, and thereby, it is possible to make intensity distribution more uniform, and to reduce an error on the occasion of comparing a received light amount of reflected light with a threshold value, and therefore, even if a light receiving surface is small, it is possible to detect an object with high accuracy.
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