| 摘要 |
<p>This near-infrared cutoff filter is provided with a transparent substrate and an optical multilayer film provided on at least one principal face of the transparent substrate, and is characterized in that the optical multilayer film is configured from a high-refractive-index film having a refractive index of 2.0 or higher and a low-refractive-index film having a refractive index of 1.6 or lower at a wavelength of 500 nm, the optical multilayer film has a repeating structure of (anQH, bnQL, cnQH, dnQL)^n, where QH is the QWOT of the high-refractive-index film at a wavelength of 500 nm and QL is the QWOT of the low-refractive-index film at a wavelength of 500 nm, the average value of an is 1.5 to 2.5, and the value obtained by averaging the average values of bn, cn, and dn is 1.0 or less.</p> |
