赤外遮蔽フィルム

Film anti-infrarouge

Infrared shielding film

Abstract

[Problem] To provide an infrared shielding film having a broad reflection band and with which there is no coloring regardless of the angle from which it is viewed. [Solution] The present invention provides an infrared shielding film having a laminated body formed by alternately layering a high-reflectivity layer and a low-reflectivity layer which respectively contain a high-reflectivity material and a low-reflectivity material having mutually different reflectivity. This infrared shielding film is equipped with: a primary reflection unit for which s(60) nm > 700 nm, when the wavelengths which respectively provide a primary reflection band with a reflectivity exceeding 60% in the near-infrared region in the reflection spectrum of the infrared shielding film for incident light angles of 0° and 60°, and which exhibit a reflectivity of 70% of the peak value of the primary reflection band on the short-wavelength side of the primary reflection band, are set respectively as s(0) nm and s(60) nm; and an auxiliary reflection unit, which provides an auxiliary reflection peak having a reflectivity of 30-60% of the peak value of the primary reflection band at 700-s(0) nm in the reflection spectrum for the incident light angle of 0°.
Le problème à résoudre dans le cadre de la présente invention consiste à proposer un film anti-infrarouge qui présente une large bande de réflexion et avec lequel il n'y a pas de coloration quel que soit l'angle à partir duquel il est regardé. La solution proposée par la présente invention consiste en un film anti-infrarouge qui comprend un corps stratifié qui est formé en disposant en couches alternées une couche à forte réflectivité et une couche à faible réflectivité qui contiennent respectivement un matériau à forte réflectivité et un matériau à faible réflectivité qui présentent une réflectivité mutuellement différente. Ce film anti-infrarouge est pourvu : d'une unité de réflexion primaire pour laquelle s(60) nm > 700 nm, où les longueurs d'onde qui donnent respectivement une bande de réflexion primaire ayant une réflectivité qui dépasse 60 % dans la région dans le proche infrarouge dans le spectre de réflexion du film anti-infrarouge pour des angles d'incidence de la lumière compris entre 0° et 60°, et qui présentent une réflectivité représentant 70 % de la valeur de pic de la bande de réflexion primaire sur le côté de courte longueur d'onde de la bande de réflexion primaire, sont respectivement établies à s(0) nm et à s(60) nm ; et d'une unité de réflexion auxiliaire qui donne un pic de réflexion auxiliaire qui présente une réflectivité comprise entre 30 et 60 % de la valeur de pic de la bande de réflexion primaire à 700-s(0) nm dans le spectre de réflexion pour un angle d'incidence de la lumière de 0°.
【課題】反射帯域が広く、どの視野角度から見ても色付きのない、赤外遮蔽フィルムを提供する。 【解決手段】本発明によれば、互いに屈折率の異なる高屈折率材料と低屈折率材料とをそれぞれ含む、高屈折率層と低屈折率層とを交互に積層してなる積層体を有する赤外遮蔽フィルムであって、前記赤外遮蔽フィルムの入射光角度0°および60°における反射スペクトル中、それぞれ近赤外線領域に反射率60%を超える主反射帯域を与え、前記主反射帯域の短波長側で、前記主反射帯域のピーク値の70%の反射率を示す波長をそれぞれs(0)nmおよびs(60)nmとしたときに、s(60)nm>700nmを示す主反射ユニットと、前記入射角度0°における反射スペクトル中、700~s(0)nmに前記主反射帯域のピーク値の30~60%の反射率を有する副反射ピークを与える、副反射ユニットと、を備える、赤外遮蔽フィルムが提供される。

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Cited By (1)

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