Patent ID: 8292443

Claim:
A mirror structure to be used under an environment that the maximum irradiance of incident light is 5 kW/m 2 or more, comprising: a mirror having an area of 0.2 m 2 or more; a supporting member to support the mirror; and a resin-made adhesive sheet to glue the mirror to the supporting member; wherein the mirror comprises a plate-shaped substrate, and a dielectric multilayer formed on at least an incident light side surface of the substrate and the mirror has an average reflectance ratio of 95% or more for incident light having a wavelength in a range of 400 to 1000 nm, and wherein the resin-made adhesive sheet includes plural resin-made adhesive sheets arranged in a discrete arrangement on the supporting member so as to form plural gluing regions, and wherein when a shortest distance between two neighboring gluing regions among the plural gluing regions is D, a specific gravity of the substrate is Sρ, a Young's modulus of the substrate is E, and a thickness of the substrate is t, the following conditional formula is satisfied: 0.05× 3 √( Et 2 /S ρ)< D< 0.2× 3 √( Et 2 /S ρ).