Abstract: A purpose of the present invention is to provide a photoelectric sensor and an emitting device for a photoelectric sensor which can improve resistance to liquids. A purpose of the present invention is also to provide a photoelectric sensor and an emitting device for a photoelectric sensor which can improve productivity.

Abstract: A purpose of the present invention is to provide a photoelectric sensor and an emitting device for a photoelectric sensor which can improve resistance to liquids. A purpose of the present invention is also to provide a photoelectric sensor and an emitting device for a photoelectric sensor which can improve productivity.

Abstract: A circuit substrate is divided into a light emitting circuit substrate 60 and a light receiving circuit substrate 70, and they are disposed in a first casing 21 in a two-tier fashion, and the light emitting circuit substrate 60, which is disposed on an upper side, is overlapped with at least a part of an optical system 40. By this means, it is possible to obtain a wider range mounting surface in a small space, and therefore, it is possible to miniaturize a switch main body. In addition, it is possible to miniaturize the switch main body without miniaturizing the optical system 40 more than necessity, simply by changing a disposal configuration of components other than components of the optical system 40 in the switch main body, and therefore, it is possible to prevent lowering of detection accuracy which goes with miniaturization of the optical system 40, and it is possible to detect an object with high accuracy.

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.

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.

Abstract: A circuit substrate is divided into a light emitting circuit substrate 60 and a light receiving circuit substrate 70, and they are disposed in a first casing 21 in a two-tier fashion, and the light emitting circuit substrate 60, which is disposed on an upper side, is overlapped with at least a part of an optical system 40. By this means, it is possible to obtain a wider range mounting surface in a small space, and therefore, it is possible to miniaturize a switch main body. In addition, it is possible to miniaturize the switch main body without miniaturizing the optical system 40 more than necessity, simply by changing a disposal configuration of components other than components of the optical system 40 in the switch main body, and therefore, it is possible to prevent lowering of detection accuracy which goes with miniaturization of the optical system 40, and it is possible to detect an object with high accuracy.