发明名称 |
NEAR-INFRARED CUT FILTER |
摘要 |
A near-infrared cut filter has an optical multilayer provided on at least one main surface of a transparent substrate, in which the optical multilayer is formed of a high-refractive index layer having a refractive index of 2.0 or more, and a low-refractive index layer having a refractive index of 1.6 or less at a wavelength of 500 nm, and the optical multilayer has a repeating structure of (anQH, bnQL, cnQn, dnQL)̂n when a QWOT at the wavelength of 500 nm of the high-refractive index layer is set to QH, and a QWOT at the wavelength of 500 nm of the low-refractive index layer is set to QL, in which an average value of the an is not less than 1.5 nor more than 2.5, and a value obtained by averaging average values of the respective bn, cn, and dn is 1.0 or less. |
申请公布号 |
US2015160386(A1) |
申请公布日期 |
2015.06.11 |
申请号 |
US201514621899 |
申请日期 |
2015.02.13 |
申请人 |
ASAHI GLASS COMPANY, LIMITED |
发明人 |
TAKEMURA Mitsuyuki |
分类号 |
G02B5/28 |
主分类号 |
G02B5/28 |
代理机构 |
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代理人 |
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主权项 |
1. A near-infrared cut filter, comprising:
a transparent substrate; and an optical multilayer provided on at least one main surface of the transparent substrate, wherein: the optical multilayer is formed of a high-refractive index layer having a refractive index of 2.0 or more, and a low-refractive index layer having a refractive index of 1.6 or less at a wavelength of 500 nm; and the optical multilayer has a repeating structure of (anQH, bnQL, cnQH, dnQL)̂n when a QWOT at the wavelength of 500 nm of the high-refractive index layer is set to QH, and a QWOT at the wavelength of 500 nm of the low-refractive index layer is set to QL, in which an average value of the an is not less than 1.5 nor more than 2.5, and a value obtained by averaging average values of the respective bn, cn, and dn is 1.0 or less. |
地址 |
Tokyo JP |