Light absorptive film having an anti-reflecting property

Claim 2

A light absorptive film comprising a first sub-film comprising a first dielectric layer and a first metallic layer, a second sub-film comprising a second dielectric layer and a second metallic layer, and a third dielectric layer, said first and second sub-films being arranged oppositely on both the sides of said third dielectric layer and said light absorptive film having the following numerical data: ______________________________________ n.sub.0 = 1.52 (glass plate) n.sub.1 = 2.33 d.sub.1 = 30 nm n.sub.2 = 1.97-3.33i d.sub.2 = 10.2 nm n.sub.3 = 1.33 d.sub.3 = 300.9 nm n.sub.4 = 1.97-3.33i d.sub.4 = 10.2 nm n.sub.5 = 2.33 d.sub.5 = 30 nm n.sub.6 = 1.52 (glass plate) ______________________________________

Claim 3

A light absorptive film comprising a first sub-film comprising a first dielectric layer and a first metallic layer, a second sub-film comprising a second dielectric layer and a second metallic layer, and a third dielectric layer, said first and second sub-films being arranged oppositely on both the sides of said third dielectric layer and said light absorptive film having the following numerical data: ______________________________________ n.sub.0 = 1.52 (glass plate) n.sub.1 = 2.33 d.sub.1 = 38.6 nm n.sub.2 = 1.97-3.33 i d.sub.2 = 10.2 nm n.sub.3 = 1.33 d.sub.3 = 142.9 nm n.sub.4 = 1.97-3.33 i d.sub.4 = 10.2 nm n.sub.5 = 2.33 d.sub.5 = 30 nm n.sub.6 = 1.52 (glass plate) ______________________________________

Claim 4

A light absorptive film comprising a first sub-film comprising a first dielectric layer and a first metallic layer, a second sub-film comprising a second dielectric layer and a second metallic layer, and a third dielectric layer, said first and second sub-films being arranged oppositely on both the sides of said third dielectric layer and said light absorptive film having the following numerical data: ______________________________________ n.sub.0 = 1.52 (glass plate) n.sub.1 = 2.33 d.sub.1 = 38.6 nm n.sub.2 = 1.97-3.33 i d.sub.2 = 10.2 nm n.sub.3 = 1.33 d.sub.3 = 142.9 nm n.sub.4 = 1.97-3.33 i d.sub.4 = 10.2 nm n.sub.5 = 2.33 d.sub.5 = 30 nm n.sub.6 = 1.52 (glass plate) ______________________________________

Claim 5

A light absorptive film comprising a first sub-film comprising a first dielectric layer and a first metallic layer, a second sub-film comprising a second dielectric layer and a second metallic layer and a third dielectric layer, said first and second sub-films being arranged oppositely on both the sides of said third dielectric layer and said light absorptive film having the following numerical data: ______________________________________ n.sub.0 = 1.52 (glass plate) n.sub.1 = 2.33 d.sub.1 = 30 nm n.sub.2 = 1.97-3.33 i d.sub.2 = 9.1 nm n.sub.3 = 1.33 d.sub.3 = 127.8 nm n.sub.4 = 1.97-3.33 i d.sub.4 = 12.7 nm n.sub.5 = 2.33 d.sub.5 = 30 nm n.sub.6 = 1.52 (glass plate) ______________________________________

Claim 6

A light absorptive film comprising a first sub-film comprising a first dielectric layer and a first metallic layer, a second sub-film comprising a second dielectric layer and a second metallic layer and a third dielectric layer, said first and second sub-films being arranged oppositely on both the sides of said third dielectric layer and said light absorptive film having the following numerical data: ______________________________________ n.sub.0 = 1.52 (glass plate) n.sub.1 = 2.33 d.sub.1 = 30 nm n.sub.2 = 1.97-3.33 i d.sub.2 = 9.1 nm n.sub.3 = 1.33 d.sub.3 = 127.8 nm n.sub.4 = 1.97-3.33 i d.sub.4 = 12.7 nm n.sub.5 = 2.33 d.sub.5 = 30 nm n.sub.6 = 1.52 (glass plate) ______________________________________

Claim 7

A light absorptive film comprising a first sub-film having a light absorptive function when used independently, and comprising a first dielectric layer and a first metallic layer, and a second sub-film having a light absorptive function when used independently, and comprising a second dielectric layer and a second metallic layer, and a third dielectric layer, said first and second sub-films being arranged oppositely on both the sides of said third dielectric layer, said first and second dielectric layers being made of the same material, and said first and second metallic layers being made of different materials.

Claim 8

A light absorptive film comprising a first sub-film having a light absorptive function when used independently, and comprising a first dielectric layer and a first metallic layer, and a second sub-film having a light absorptive function when used independently, and comprising a second dielectric layer and a second metallic layer, and a third dielectric layer, said first and second sub-films being arranged oppositely on both the sides of said third dielectric layer, said first and second dielectric layers being made of the same material, and said first and second metallic layers being made of different materials.

Claim 9

A light absorptive film according to claim 4 having the following numerical data. ______________________________________ n.sub.0 = 1.52 (glass plate) n.sub.1 = 2.33 d.sub.1 = 30 nm n.sub.2 = 1.97-3.33 i d.sub.2 = 10.2 nm n.sub.3 = 1.33 d.sub.3 = 103 nm n.sub.4 = 0.89-1.51 i d.sub.4 = 31.5 nm n.sub.5 = 2.33 d.sub.5 = 23.9 nm n.sub.6 = 1.52 (glass plate) ______________________________________

Claim 10

A light absorptive film according to claim 4 wherein wavelength dependency of phase variation of transmission light of said first metallic layer is made opposite to that of said second metallic layer.

Claim 11

A light absorptive film comprising a first sub-film having a light absorptive function when used independently, and comprising a first dielectric layer and a first metallic layer, a second sub-film having a light absorptive function when used independently, and comprising a second dielectric layer and a second metallic layer, and a third dielectric layer, said first and second sub-films being arranged oppositely on both the sides of said third dielectric layer, said first and second dielectric layers being made of different materials, and said first and second metallic layers being made of different materials.

Claim 12

A light absorptive film comprising a first sub-film having a light absorptive function when used independently, and comprising a first dielectric layer and a first metallic layer, a second sub-film having a light absorptive function when used independently, and comprising a second dielectric layer and a second metallic layer, and a third dielectric layer, said first and second sub-films being arranged oppositely on both the sides of said third dielectric layer, said first and second dielectric layers being made of different materials, and said first and second metallic layers being made of different materials.

Claim 13

A light absorptive film according to claim 7 wherein wvelength dependency of phase variation of transmission light of the first metallic layer is opposite to that of said second metallic layer.

Claim 14

A light absorptive film according to claim 7 wherein each of said first and second sub-film consists of a dielectric layer, a metallic layer and a dielectric layer.

Claim 15

A light absorptive film comprising a first sub-film consisting of a first dielectric layer and a first metallic layer, a second sub-film consisting of a second dielectric layer and a second metallic layer, and a third dielectric layer, said first and second sub-films are arranged oppositely on both the sies of said third dielectric layer, said light absorptive film satisfying a condition of |r 0 |+|r 2 |e - γ <|r 1 | and said third dielectric layer has an optical thickness equal to λ/4 multiplied by an odd integer, wherein the reference symbol r 0 represents reflectance of the incidence surface of said first dielectric component layer, the reference symbol r 1 designates reflectance of the boundary surface between said first dielectric layer and said first metallic layer, and the reference symbol r 2 denotes reflectance of the boundary surface between said first metallic layer and said third dielectric layer.

Claim 16

A light absorptive film comprising a first sub-film consisting of a first dielectric layer and a first metallic layer, a second sub-film consisting of a second dielectric layer and a second metallic layer, and a third dielectric layer, said first and second sub-films are arranged oppositely on both the sies of said third dielectric layer, said light absorptive film satisfying a condition of |r 0 |+|r 2 |e - γ <|r 1 | and said third dielectric layer has an optical thickness equal to λ/4 multiplied by an odd integer, wherein the reference symbol r 0 represents reflectance of the incidence surface of said first dielectric component layer, the reference symbol r 1 designates reflectance of the boundary surface between said first dielectric layer and said first metallic layer, and the reference symbol r 2 denotes reflectance of the boundary surface between said first metallic layer and said third dielectric layer.

Claim 17

A light absorptive film comprising a first sub-film consisting of a first dielectric layer and a first metallic layer, a second sub-film consisting of a second dielectric layer and a second metallic layer, and a third dielectric layer, said first and second sub-films being arranged oppositely on both the sides of said third dielectric layer, said light absorptive film satisfying a condition of |r 0 |+|r 2 |e - γ >|r 1 | and said third dielectric layer having an optical thickness equal to λ/4 multiplied by an even integer, wherein the reference symbol r 0 represents reflectance of the incidence surface of said first dielectric component layer, the reference symbol r 1 designates reflectance of the boundary surface between said first dielectric layer and said first metallic layer, and the reference symbol r 2 denotes reflectance of the boundary surface between said first metallic layer and said third dielectric layer.

Claim 18

A light absorptive film comprising a first sub-film consisting of a first dielectric layer and a first metallic layer, a second sub-film consisting of a second dielectric layer and a second metallic layer, and a third dielectric layer, said first and second sub-films being arranged oppositely on both the sides of said third dielectric layer, said light absorptive film satisfying a condition of |r 0 |+|r 2 |e - γ >|r 1 | and said third dielectric layer having an optical thickness equal to λ/4 multiplied by an even integer, wherein the reference symbol r 0 represents reflectance of the incidence surface of said first dielectric component layer, the reference symbol r 1 designates reflectance of the boundary surface between said first dielectric layer and said first metallic layer, and the reference symbol r 2 denotes reflectance of the boundary surface between said first metallic layer and said third dielectric layer.