Patent ID: 7826113

Claim:
A joined optical member comprising a plurality of part optical members joined together with adhesive, each of the part optical members having exterior surfaces and joined surfaces separate from exterior surfaces, wherein the joined optical member is formed by forming, before the part optical members are joined together, a surface coating layer on the exterior surfaces of the part optical members, then joining together the part optical members with the adhesive applied on joined surfaces thereof so that the joined surfaces are positioned in opposition with respect to each other with the adhesive disposed therebetween, then hardening the adhesive until a superfluous part thereof that has oozed from between the joined surfaces loses fluidity, and then wiping off the superfluous part of the adhesive, and wherein a relationship in adhesion strength among different pairs of materials is such that (adhesion strength between the surface coating layer and the part optical members)>(adhesion strength between the surface coating layer and the adhesive) and simultaneously (adhesion strength between the part optical members and the adhesive)>(adhesion strength between the surface coating layer and the adhesive).