| 摘要 |
<p>Provided is a near-infrared reflective film that suppresses reflection peaks such as ripples that can arise in the visible region and shows an excellent reflection peak in the near-infrared region. A near-infrared reflective film having a support, and a dielectric multilayer film disposed on the support, in which a high-refractive index layers and a low-refractive index layer are alternately layered, wherein any of the high-refractive index layer and the low-refractive index layer adjacent to said high-refractive index layer satisfy: 1.1 ‰¥ (dH × nH)/(dL × nL) > 1 or 1 > (dH × nH)/(dL × nL) ‰¥ 0.9, wherein dH represents the thickness of the high-refractive index layer, nH represents the refractive index of the high-refractive index layer, dL represents the thickness of the low-refractive index layer, nL represents the refractive index of the low-refractive index layer, dH × nH represents the optical film thickness of the high-refractive index layer, and dL × nL represents the optical film thickness of the low-refractive index layer, the dielectric multilayer film has a dielectric film group set including a first dielectric film group including at least three high-refractive index layers (refractive index n 1 H, thickness d 1 H) and at least three low-refractive index layers (refractive index n 1 L, thickness d 1 L), respectively, and a second dielectric film group including at least three high-refractive index layers (refractive index n 2 H, thickness d 2 H) and at least three low-refractive index layers (refractive index n 2 L, thickness d 2 L), respectively, which is adjacent to the opposite surface of the support of the first dielectric film group, wherein the dielectric film group set satisfies 1.10 ‰¥ d 2 H/d 1 H > 1 and 1.10 ‰¥ d 2 L/d 1 L > 1.</p> |
