| abstract |
According to the present invention, a thermal barrier film, a thermal barrier coating, and such a thermal barrier film having high reflectivity even in a thin film, little temperature rise due to sunlight, high film thickness accuracy, and high wear resistance. Provided is an optical instrument. A thermal barrier film in which high refractive index particles having a d-line refractive index of 2.5 or more and 3.2 or less are dispersed in a resin matrix, the resin matrix comprising a urethane resin, an acrylic resin, an epoxy resin, and A heat-shielding film comprising pore-containing particles having an average particle diameter of 100 nm or less in a resin selected from these combinations, wherein the high-refractive-index particles have an average particle diameter of 2 μm to 5 μm . [Selection] Figure 3 |