Regressive reflection type photoelectric switch
AssigneeKeyence Corporation
InventorsTomoki Deguchi, Shinichi Tsukigi
Life of this patent
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Abstract
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.
Claims10
A regressive reflection type photoelectric switch which receives a reflected light from a regressive reflection plate comprising:
- a light emitting element which irradiates laser light;
- a light receiving element which receives the reflected light of the laser light, which is reflected by the regressive reflection plate;
- and
- a light emitting lens which converts the laser light into nearly parallel light, the light emitting lens having a light inputting surface to which the laser right, which is irradiated from the light emitting element, is inputted, and a light emitting surface which emits the laser light,
- wherein a concave curved surface is formed on the light inputting surface, and a convex curved surface is formed on the light emitting surface.
Dependencies are inferred from the claim text.