| 摘要 |
PROBLEM TO BE SOLVED: To provide a low reflection glass article coated with optical multi- layer film which can reduce reflectance in a wide range of visible light area. SOLUTION: In this article, a first layer with an intermediate refractive index (n1) of 1.60-1.95 and a film thickness of (60-130 nm)/n1, a second layer with a high refractive index (n2) which is within a range of 1.91-2.60 and also not less than 0.20 bigger than the refractive index of the first layer mentioned above and a film thickness of (140-230 mn)/n2 and a third layer with a low refraction index (n3) which is within a range of 1.35-1.59) and not less than 0.20 smaller than the refractive index of the first layer and a film thickness of (110-150 nm)/n3 are laminated in this order on a transparent glass base substance with a refractive index of 1.47-1.53, and the second layer contains titanium oxide and other metal oxide for not less than 70 mol.%, in total, the third layer contains silicon oxide for 50-100 mol.% and other metal oxide for 0-10 mol.% in total and the first layer contains silicon oxide for 15-80 mol.% and other metal oxide for 20-70 mol.% in total. |
