Transparent substrate with multilayer film and image display device
The present invention relates to a transparent substrate with a multilayer film including: a transparent substrate having two main surfaces; and a multilayer film obtained by laminating at least two or more layers having refractive indices different from each other, and disposed on or above at least one main surface of the transparent substrate, in which the multilayer film includes one or more silicon oxide layers, and at least one layer of the one or more silicon oxide layers has a refractive index of 1.460≤n<1.478 at a wavelength of 550 nm.
1 . A transparent substrate with a multilayer film comprising:
a transparent substrate having two main surfaces; and
a multilayer film obtained by laminating at least two or more layers having refractive indices different from each other, and disposed on or above at least one main surface of the transparent substrate, wherein
the multilayer film comprises
one or more silicon oxide layers;
one or more first metal oxide layers; and
at least two second metal oxide layers,
at least one layer of the one or more first metal oxide layers is sandwiched and laminated between two second metal oxide layers,
the second metal oxide layers sandwiching the first metal oxide layer each have a film thickness of 8 nm or more,
the one or more first metal oxide layers are each a layer being mainly formed of a mixed oxide comprising Mo and Nb and having an extinction coefficient k of 0.004 to 0.029 at a wavelength of 550 nm,
the second metal oxide layers are each a layer being mainly formed of a mixed oxide comprising Mo and Nb and having an extinction coefficient k of 0.004 or less at the wavelength of 550 nm, and
at least one layer of the one or more silicon oxide layers has a refractive index of 1.460≤n<1.478 at a wavelength of 550 nm.
2 . The transparent substrate with a multilayer film according to claim 1 , wherein
the first metal oxide layer has a total content of Si, Nb, Ti, Zr, Ta, Al, Sn, and In of less than 80 mass % with respect to a total mass of Si, Nb, Ti, Zr, Ta, Al, Sn, In, Mo, and W contained in the first metal oxide layer.
3 . The transparent substrate with a multilayer film according to claim 1 , further comprising an antifouling film on or above the multilayer film.
4 . The transparent substrate with a multilayer film according to claim 1 , wherein the transparent substrate is a glass substrate or a resin substrate.
5 . The transparent substrate with a multilayer film according to claim 1 , wherein the transparent substrate is a laminate comprising a glass and a resin substrate.
6 . The transparent substrate with a multilayer film according to claim 5 , wherein the glass is chemically strengthened.
7 . The transparent substrate with a multilayer film according to claim 1 , wherein the transparent substrate is subjected to an anti-glare treatment on the main surface having the multilayer film.
8 . An image display device comprising the transparent substrate with a multilayer film according to claim 1 .