Keyence Corporation

Tomoki Deguchi

Shinichi Tsukigi

Katsunari Koyama

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. According to the present invention, a main casing is described in which a plurality of photoelectric elements are included along a first direction; a first opening formed on the main casing for passing through a light corresponding to the photoelectric element between the inside and outside of the main casing; a transparent plate affixed on a pair of first surfaces of the main casing so as to cover the first opening, for passing through the light between the inside and outside of the main casing; a first adhesive member disposed between the transparent plate and the pair of first surfaces, for affixing the transparent plate on the pair of first surfaces; a pair of projections formed on the main casing along the first direction, outstanding along to an optical axis of the light, and disposed apart from each other whereby the transparent plate is accessible from the outside of the main casing to the pair of first surfaces; a pair of channels formed on the main casing along the first direction and between the pair of first surfaces and the pair of projections of the main casing; and a pair of first pressing members fixed in the pair of channels and contacting an opposite side of the surface where the transparent plate is located, for pressing the transparent plate to the main casing.

Photoelectric sensor and emitting device for photoelectric sensor

A circuit substrate is divided into a light emitting circuit substrateand a light receiving circuit substrateand they are disposed in a first casingin a two-tier fashion, and the light emitting circuit substratewhich is disposed on an upper side, is overlapped with at least a part of an optical systemBy 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 systemmore than necessity, simply by changing a disposal configuration of components other than components of the optical systemin the switch main body, and therefore, it is possible to prevent lowering of detection accuracy which goes with miniaturization of the optical systemand it is possible to detect an object with high accuracy.

Reflection type photoelectric switch

A concave curved surfaceis formed on a light inputting surfaceof a light emitting lens, and a convex curved surfaceis formed on a light emitting surface. Only laser light close to an optic axis A is inputted to the concave curved surface, 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.

Growing community of inventors

Osaka, Japan

Tomoki Deguchi