INFRARED FILTER
First Claim
Patent Images
1. An infrared filter comprisinga transparent substrate;
- andan infrared-filtering multilayer film, wherein the infrared-filtering multilayer film is coated on the transparent substrate, and the infrared-filtering multilayer film comprises;
a plurality of the first kind of film layers;
a plurality of the second kind of film layers;
a plurality of the third kind of film layers; and
a plurality of the fourth kind of film layers;
wherein the four kinds of film layers are arranged in order of gradient refractive indexes, at least two kinds of film layers are made of composite material, a refractive index of the first kind of film layers is NA, a refractive index of the second kind of film layers is NB, a refractive index of the third kind of film layers is NC, a refractive index of the fourth kind of film layers is ND, a total number of the film layers of the infrared-filtering multilayer film is TL, and the following conditions are satisfied;
2.2≦
NA<
2.4;
1.9≦
NB<
2.2;
1.6≦
NC<
1.9;
1.4≦
ND<
1.6; and
80≦
TL.
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Abstract
An infrared filter includes a transparent substrate, and an infrared-filtering multilayer film. The infrared-filtering multilayer film is coated on the transparent substrate, and the infrared-filtering multilayer film includes a plurality of the first kind of film layers, a plurality of the second kind of film layers, a plurality of the third kind of film layers and a plurality of the fourth kind of film layers, wherein the four kinds of film layers are arranged in order of gradient refractive indexes. At least two kinds of film layers are made of composite materials.
-
Citations
6 Claims
-
1. An infrared filter comprising
a transparent substrate; - and
an infrared-filtering multilayer film, wherein the infrared-filtering multilayer film is coated on the transparent substrate, and the infrared-filtering multilayer film comprises; a plurality of the first kind of film layers; a plurality of the second kind of film layers; a plurality of the third kind of film layers; and a plurality of the fourth kind of film layers; wherein the four kinds of film layers are arranged in order of gradient refractive indexes, at least two kinds of film layers are made of composite material, a refractive index of the first kind of film layers is NA, a refractive index of the second kind of film layers is NB, a refractive index of the third kind of film layers is NC, a refractive index of the fourth kind of film layers is ND, a total number of the film layers of the infrared-filtering multilayer film is TL, and the following conditions are satisfied; 2.2≦
NA<
2.4;1.9≦
NB<
2.2;1.6≦
NC<
1.9;1.4≦
ND<
1.6; and80≦
TL. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification