Optical body, wall member, building fitting, and solar shading device

Abstract

An optical body includes a first optical layer having a random concave-convex surface, a reflecting layer formed on the concave-convex surface, and a second optical layer formed on the reflecting layer to embed the concave-convex surface, wherein the reflecting layer is a wavelength-selective reflecting layer for diffusely reflecting, of incident light, light in a specific wavelength band and transmitting light other than the specific wavelength band therethrough.

Description

technical field [0001] The invention relates to optical bodies, wall elements, building fittings and sun protection devices. More specifically, the present invention relates to optical bodies for diffusely reflecting incident light. Background technique [0002] There is a window film for shading on the market in consideration of reducing the air conditioning load. Films for reflecting sunlight are also marketed as an example of shading technology. To manufacture the thin film, various methods have been disclosed which employ optical multilayer films, metal-containing films, transparent conductive films as reflective layers (see, for example, International Publication No. 05 / 087680). [0003] However, this type of reflective layer is formed on flat window glass, and incident sunlight is only specularly (regularly) reflected. Thus, light from the sky and reflected by the mirror of the flat window glass reaches other nearby buildings and the ground outdoors, where it is abs...

AI Technical Summary

Problems solved by technology

In urban areas, this causes the problem that the heat island phenomenon is exacerbated and grass cannot grow in areas illuminated by this reflected light

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