Patent ID: 8018078

Claim:
The combination of a semiconductor substrate and a photo key disposed on the semiconductor substrate, wherein: the photo key has a plurality of first regions spaced apart from one another in a given direction substantially parallel to the plane of the substrate, and a second region surrounding each of the first regions, one of the first regions and the second region constituting photo key regions spaced apart from one another in the given direction, and each of the photo key regions comprises first conductive patterns each of a first composition and arrayed in at least a first direction substantially parallel to the plane of the substrate, and second conductive patterns each of a second composition different from that of the first composition, respective ones of the second conductive patterns being interposed in the first direction between respective ones of the first conductive patterns, and wherein all of the first conductive patterns in the photo key region are sandwiched in the first direction between a set of the second conductive patterns such that the set of the second conductive patterns is disposed on the outside of the first conductive patterns.