Patent ID: 7550708

Claim:
A photoelectric sensor having a photoelectric element which generates an electrical signal corresponding to amount of receiving light, the photoelectric sensor comprising: a main casing 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 an 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, projecting along an optical axis of the light, and disposed apart from each other whereby the transparent plate assembles 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 affixed surface of the transparent plate, for pressing the transparent plate to the main casing.