Optical element, window material, fitting, and insolation shielding device

Abstract

The invention provides an optical element, a window material, a fitting, and an insolation shielding device. The optical element has a first optical layer; a reflective layer; and a second optical layer. The reflective layer includes at least five layers of high refractive-index layers and metal layers alternately laminated. When a thickness L of the entire reflective layer is 80 nm, a ratio [alpha] of an optical thickness of the entire metal layers to that of the entire high refractive-index layers and a ratio [beta] of an optical thickness of a third high refractive-index layer to that of a first high refractive-index layer are included in a first region, when the thickness L is 90 nm, the ratios [alpha] and [beta] are included in a second region, and when the thickness L is 80 to 90 nm, the ratios [alpha] and [beta] are included in a space enclosed by the first region, the second region, and straight lines derived from these regions.

Description

technical field [0001] The present invention relates to an optical element, a window material, a housing fitting, and a solar shading device, each of which can suppress a change in color tone. Background technique [0002] In recent years, architectural glazing of skyscrapers or high-rise houses and window panes of vehicles have increasingly been provided with layers which absorb or reflect some of the sunlight. The above-mentioned glass is used as an energy-saving measure aimed at preventing global warming, and is intended to reduce the load on the air-conditioning system by increasing the indoor temperature when light energy emitted from the sun enters the indoor space through the window. Light energy emitted from sunlight mainly includes light in the visible region with a wavelength ranging from 380 nm to 780 nm and light in the near-infrared region having a wavelength ranging from 780 nm to 2100 nm. In particular, the transmittance of a window in the wavelength range of...

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Problems solved by technology

Therefore, around a building in which the above-mentioned reflective layer is attached to all windows, various problems occur, namely, for example, since a local

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