Reflective mirror for light concentrating system, and light concentrating system

Abstract

A reflective mirror for a light concentrating system, having high reflectance and superior durability; and a light concentrating system including this reflective mirror for a light concentrating system. The reflective mirror includes a substrate and a reflective layer provided on the substrate, in which the reflective layer includes a material having a refractive index at a wavelength of 2500 nm of no less than 2.5 and having a Mohs hardness of 12 to 15. The light concentrating system includes the reflective mirror and a light receiving part that receives light reflected by the reflective mirror.

What is claimed is: 
     
         1 . A reflective mirror, comprising a substrate and a reflective layer provided on the substrate, wherein the reflective layer is composed of material having a refractive index at a wavelength of 2500 nm of no less than 2.5 and having a Mohs hardness of 12 to 15. 
     
     
         2 . The reflective mirror according to  claim 1 , wherein the reflective mirror is a surface reflective mirror. 
     
     
         3 . The reflective mirror according to  claim 1 , wherein the reflective mirror is used for a sunlight concentrating system. 
     
     
         4 . A light concentrating system comprising: the reflective mirror according to  claim 1 ; and a light receiving part that receives light reflected by the reflective mirror. 
     
     
         5 . The light concentrating system according to  claim 4 , further comprising a driving part that changes an orientation of the reflective mirror by following the solar motion. 
     
     
         6 . The reflective mirror according to  claim 1 , wherein the reflective mirror is used for a light concentrating system.