Optical filter for screening out infrared and ultraviolet light
First Claim
1. An optical filter for screening out infrared and ultraviolet light, comprising:
- a transparent substrate having a first surface and an opposite second surface;
a first film stack formed on the first surface of the substrate; and
a second film stack formed on the second surface of the substrate, the first and second film stacks each comprising a plurality of high refractive index layers and a plurality of low refractive index layers alternately stacked one on another, wherein the first film stack is defined as follows;
(HL)7(0.76H0.76L)6 wherein H represents a high refractive index layer having a base optical thickness equal to one fourth of a first reference wavelength associated with the optical filter, L represents a low refractive index layer having a base optical thickness equal to one fourth of a first reference wavelength associated with the optical filter, the expression enclosed in each parenthesis represents a filter cavity, and superscripts represent the number of repetitions of the expression enclosed in the parenthesis;
the second film stack is defined as follows;
0.5(HL)(1.3H1.3L)9(HL)8 wherein, H represents a high refractive index layer having a base optical thickness equal to one fourth of a second reference wavelength associated with the optical filter, L represents a low refractive index layer having a base optical thickness equal to one fourth of a second reference wavelength associated with the optical filter, the expression enclosed in each parenthesis represents a filter cavity, and the superscript represents the number of repetitions of the expression enclosed in the parenthesis.
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Accused Products
Abstract
An optical filter includes a transparent substrate, a first film stack and a second film stack. The first and second film stacks each includes a number of high refractive index layers and a number of low refractive index layers alternately stacked one on another. The first film stack is defined as (HL)7(0.76H0.76L)6, and the second film stack is defined as 0.5(HL)(1.3H1.3L)9(HL)8, wherein, H represents a high refractive index layer having a base optical thickness equal to one fourth of a first reference wavelength associated with the optical filter, L represents a low refractive index layer having a base optical thickness equal to one fourth of a first reference wavelength associated with the optical filter, the expression enclosed in each parenthesis represents a filter cavity, and the superscript represents the number of repetition of the expression enclosed in that parenthesis.
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Citations
8 Claims
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1. An optical filter for screening out infrared and ultraviolet light, comprising:
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a transparent substrate having a first surface and an opposite second surface;
a first film stack formed on the first surface of the substrate; and
a second film stack formed on the second surface of the substrate, the first and second film stacks each comprising a plurality of high refractive index layers and a plurality of low refractive index layers alternately stacked one on another, wherein the first film stack is defined as follows;
(HL)7(0.76H0.76L)6wherein H represents a high refractive index layer having a base optical thickness equal to one fourth of a first reference wavelength associated with the optical filter, L represents a low refractive index layer having a base optical thickness equal to one fourth of a first reference wavelength associated with the optical filter, the expression enclosed in each parenthesis represents a filter cavity, and superscripts represent the number of repetitions of the expression enclosed in the parenthesis;
the second film stack is defined as follows;
0.5(HL)(1.3H1.3L)9(HL)8wherein, H represents a high refractive index layer having a base optical thickness equal to one fourth of a second reference wavelength associated with the optical filter, L represents a low refractive index layer having a base optical thickness equal to one fourth of a second reference wavelength associated with the optical filter, the expression enclosed in each parenthesis represents a filter cavity, and the superscript represents the number of repetitions of the expression enclosed in the parenthesis. - View Dependent Claims (2, 4, 5, 6, 7, 8)
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3. An optical filter for screening out infrared and ultraviolet light, comprising:
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a transparent substrate having a first surface and an opposite second surface;
a first film stack formed on the first surface of the substrate; and
a second film stack formed on the second surface of the substrate, the first and second film stacks each comprising a plurality of high refractive index layers and a plurality of low refractive index layers alternately stacked one on another, each high refractive index layer is made of TiO2, each low refractive index layer is made of SiO2, wherein the first film stack is defined as follows;
(a1Ha2L)7(b1Hb2L)6wherein, H represents a high refractive index layer having a base optical thickness equal to one fourth of a first reference wavelength associated with the optical filter, L represents a low reference index layer having a base optical thickness equal to one fourth of the first reference wavelength associated with the optical filter, the expression enclosed in each parenthesis represents a filter cavity, and the superscript represents the number of repetitions of the expression enclosed in the parenthesis;
the second film stack is defined as follows;
0.5(c1Hc2L)(d1Hd2L)9(e1He2L)8wherein, H represents a high refractive index layer having a base optical thickness equal to one fourth of a first reference wavelength associated with the optical filter, L represents a low reference index layer having a base optical thickness equal to one fourth of the first reference wavelength associated with the optical filter, a1 is in the range from 0.372 to 1.064, a2 is in the range from 0.962 to 1.203, b1 is in the range from 0.477 to 0.946, b2 is in the range from 0.389 to 2.183, c1 is 0.130, c2 is 0.274, d1 is in the range from 1.217 to 1.312, d2 is in the range from 1.231 to 1.372, e1 is in the range from 0.940 to 1.069, e2 is in the range from 0.544 to 1.105, the expression enclosed in each parenthesis represents a filter cavity, and the superscript represents the number of repetitions of the expression enclosed in the parenthesis.
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Specification