| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antireflection film having a band from visible light to a near infrared region. <P>SOLUTION: An antireflection film comprises a laminate of 12 layers, in which a high refractive index substance having a refractive index nH of 1.95 to 2.32 and a low refractive index substance having a refractive index nL of 1.35 to 1.46 are alternately layered. Moreover, the antireflection film shows a reflectance of 1.5% or less in the wavelength range from 400 nm to 680 nm and a reflectance of 2.0% or less in the wavelength range from 680 nm to 1350 nm. In the laminate, a first, a third, a fifth, a seventh, a ninth and an eleventh layers, from a substrate side where the laminate is formed, are high refractive index layers, while a second, a fourth, a sixth, an eighth, a tenth and a twelfth layers are low refractive index layers. In each layer of the laminate, an optical film thickness that is a product of the refractive index and a physical film thickness d satisfies a predetermined formula. <P>COPYRIGHT: (C)2013,JPO&INPIT |
