AUTONOMOUS HEAT REGULATION WINDOW

To provide an environment consideration type autonomous heat regulation window of a self-active method, having excellent visible light transmissivity and being able to regulate the transmissivity of infrared light in accordance with ambient temperature.SOLUTION: An autonomous heat regulation window 10 with a region having a visible light transmissivity of 70% or more includes a first transparent substrate 1, a second transparent substrate 2 disposed on an outside air side and disposed to face the first transparent substrate 1 with a space therebetween, and a heat regulation layer 3 held between these substrates. The heat regulation layer 3 includes a liquid crystal component 31 whose orientation is displaced reversibly with respect to a predetermined temperature or a predetermined temperature range, and a shape anisotropic component 32 diffused in the liquid crystal component 31 and having the anisotropy for at least one of absorption and reflection of infrared light. The heat regulation layer 3 has lower infrared light transmissivity in a high-temperature region compared to the predetermined temperature or the predetermined temperature range than in a low-temperature region. On both sides of the heat regulation layer 3, the heat conductivity in the thickness direction on the first transparent substrate 1 side is lower than the heat conductivity in the thickness direction on the second transparent substrate 2 side.SELECTED DRAWING: Figure 1 【課題】セルフアクティブ方式において、可視光透過率に優れ、且つ、外気温に応じて赤外光の透過率を調整できる環境配慮型の自律型調熱窓を提供する。【解決手段】可視光透過率が７０％以上の領域を有する自律型調熱窓１０であって、第一透明基板１と、外気側に配置され、第一透明基板１と間隙を持って対向配置された第二透明基板２と、これらに挟持された調熱層３とを備える。調熱層３は、所定の温度または所定の温度範囲に対して可逆的に配向が変位する液晶成分３１と、液晶成分３１に分散され、赤外光の吸収および反射の少なくとも一方に異方性を有する形状異方性成分３２とを有する。調熱層３は、所定の温度または所定の温度範囲に対して高温領域では、低温領域よりも赤外光の透過率が低くなる。また、調熱層３の両側において、第一透明基板１側の厚み方向の熱伝導率が第二透明基板２側の厚み方向の熱伝導率より低い。【選択図】図１