| 摘要 |
An optical product has, on one or both of surfaces of a base, an optical multilayer film that has a seven-layer structure where low refractive index layers and high refractive index layers are alternately layered. The low refractive index layers are formed by using SiO2. The high refractive index layers are formed by using a material where a refractive index for light having a wavelength of 500 nm is greater than or equal to 2.145. When a layer closest to the base is a first layer, a fifth layer is one of the low refractive index layers, and a physical film thickness of the fifth layer is greater than or equal to 145 nm and not greater than 165 nm. A total of optical film thicknesses of a fourth layer, the fifth layer, and a sixth layer is greater than or equal to 1.3λ and not greater than 1.5λ. |
| 主权项 |
1. An optical product having, on one or both of surfaces of a base, an optical multilayer film that satisfies each of the following conditions.
(1) a seven-layer structure in which low refractive index layers and high refractive index layers are alternately layered, is formed, (2) the low refractive index layers are formed by using SiO2, (3) the high refractive index layers are formed by using a material in which a refractive index for light having a wavelength of 500 nm is greater than or equal to 2.145, (4) when a layer closest to the base is a first layer, a fifth layer is one of the low refractive index layers, and a physical film thickness of the fifth layer is greater than or equal to 145 nm and not greater than 165 nm, and (5) a total of optical film thicknesses (λ=500 nm) of a fourth layer, the fifth layer, and a sixth layer is greater than or equal to 1.3λ and not greater than 1.5λ. |
