Patent ID: 8298651

Claim:
A hollow structure forming substrate, comprising: a surface on which a plastic-deformation film is formed by using a plastic-deformable material; a plurality of regularly-arranged gas-retaining spaces each retaining gas therein; a plurality of gas leading-out parts each having a first opening which faces a corresponding one of the gas-retaining spaces and a second opening which faces the surface, the gas leading-out parts leading out the gas retained in the gas-retaining spaces toward the surface under a depressurized environmental condition; and a plurality of infiltration preventing spaces each provided in a space between a corresponding one of the first openings and a corresponding one of the second openings, the infiltration preventing spaces preventing infiltration of the plastic-deformable material from the surface into the gas-retaining spaces, wherein the plastic-deformation film is deformed and expanded on the surface by expanding pressure of the gas led-out from the gas-retaining spaces to the gas leading-out parts through the infiltration preventing spaces so as to form a hollow structure having regularly-arranged hollow parts, wherein each of the gas retaining spaces has a volume larger than that of each of the infiltration preventing spaces.