Substrate holding case

A substrate holding case for holding a substrate of a rectangular plate shape having opposite major surfaces, four corners and four side edges, comprising:

• a case body including a top cover and a bottom cover, said top and bottom covers each having an inner surface, each inner surface opposing the other substrate holding means adapted for holding a substrate inside the case body with its major surfaces in confronting relation with said inner surfaces of the top and bottom covers, respectively, said substrate holding means comprising a plurality of holding protrusions extending from each of said inner surfaces toward respective confronting major surfaces of a held substrate, said protrusions including first protrusions disposed in a rectangular configuration on each of said inner surfaces of the covers, said first protrusions being positioned at the four corners of the rectangular configuration, and second protrusions disposed at positions adjacent to, and displaced toward the center of the rectangular configuration from said first protrusions;
• substrate positioning means provided on at least one of said inner surfaces, said substrate positioning means comprising positioning projections extending toward a held substrate inside the case body and being disposed for abutment with said four side edges of a held substrate so as to position the substrate with respect to directions along the major surfaces of the substrate;
• and
• said projections being provided in pairs, each of the pairs being disposed on two adjoining side edges adjacent to each corner of the rectangular configuration, each of said projections of each pair being of an angled shaped having a first portion extending along the associated side edge of the rectangular configuration and a second portion integrally extending angularly from the first portion in a direction away from the associated side edge of the rectangular configuration and parallel to a diagonal line, subtending each corner of the rectangular configuration, said first portion being adapted to abut a side edge of a first substrate corresponding in size and orientation to said rectangular configuration, said second portion being adapted to abut a side edge of a second substrate of a size different from a said first substrate and of an orientation turned, in the plane of a held substrate, by 45.degree. relative to the orientation of a held first substrate.