申请人:Asahi Glass Company, Limited
公开号:US20170017024A1
公开(公告)日:2017-01-19
A near-infrared cut filter has an absorption layer and a reflection layer and satisfies following requirements:
average transmittance (R) of 620-750 nm is ≦20%, average transmittance (G) of 495-570 nm is ≧90%, and a ratio (R)/(G) is ≦0.20;
|T
0(600-725)
−T
30(600-725)
| is ≦3%·nm where T
0(600-725)
is a transmittance integral value of 600-725 nm in a spectral transmittance curve (0°), and T
30(600-725)
is a transmittance integral value of 600-725 nm in a spectral transmittance curve (30°);
wavelengths λIR
T(80)
, λIR
T(50)
, and λIR
T(20)
where transmittance becomes 80%, 50%, and 20% respectively in 550-750 nm in the spectral transmittance curve (0°) normalized by maximum transmittance in 450-650 nm satisfy following formulae: 0≦λIR
T(80)
−λ
T(80)
≦30 nm, 0≦λIR
T(50)
−λ
T(50)
≦35 nm, and 0≦λIR
T(20)
−λ
T(20)
≦37 nm where λ
T(80)
, λ
T(50)
, and λ
T(20)
are wavelengths on a long wavelength side where relative visibility of 0.8, 0.5 and 0.2 is exhibited in a relative visibility curve.