Heat ray absorbing lamp cover

Patent metadata

Field	Value
Publication number	US-10359171-B2
Application number	US-201515538871-A
Country	US
Kind code	B2
Filing date	Dec 18, 2015
Priority date	Dec 25, 2014
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

There is provided a heat ray absorbing lamp cover that exhibits excellent transparency and antifogging property to light sources that causes less temperature rise of a cover due to lamp irradiation, such as an LED light source and a semiconductor laser. The heat ray absorbing lamp cover has an average visible light transmittance of 75% or more, an average near-infrared light transmittance of 75% or less, and a haze of 3.0% or less.

First claim

The invention claimed is:

1. A heat ray absorbing lamp cover having an average visible light transmittance of 75% or more, an average near-infrared light transmittance of 75% or less, and a haze of 3.0% or less,
wherein the heat ray absorbing lamp cover comprises:
an inorganic infrared-ray shielding material comprising a composite tungsten oxide fine particle, and
at least one dye selected from the group consisting of a red dye, an orange dye and a yellow dye in a range of 0.1 to 10 parts by mass to 100 parts by mass of the composite tungsten oxide fine particle.

2. The heat ray absorbing lamp cover according to claim 1 , wherein the heat ray absorbing lamp cover is formed of a resin composition comprising the inorganic infrared-ray shielding material in a ratio of 1 to 5000 ppm by mass to 100 parts by mass of a thermoplastic resin.

3. The heat ray absorbing lamp cover according to claim 2 , wherein the thermoplastic resin is an acrylic resin and/or an aromatic polycarbonate resin.

4. The heat ray absorbing lamp cover according to claim 2 , wherein the composite tungsten oxide fine particle is represented by a general formula:
M x W y O z
where M represents at least one element selected from the group consisting of H, He, alkali metals, alkaline earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi and I,
x, y and z are numbers satisfying the following formulas:
0.01≤x≤1

0.001≤ x/y≤ 1 and

2.2≤ z/y≤ 3.0.

5. The heat ray absorbing lamp cover according to claim 3 , wherein the composite tungsten oxide fine particle represented by a general formula:
M x W y O z
where M represents at least one element selected from the group consisting of H, He, alkali metals, alkaline earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi and I,
x, y and z are numbers satisfying the following formulas:
0.01≤x≤1

0.001≤ x/y≤ 1 and

2.2≤ z/y≤ 3.0.

6. The heat ray absorbing lamp cover according to claim 4 , wherein the composite tungsten oxide fine particle has an average particle diameter of 1 nm to 800 nm.

7. The heat ray absorbing lamp cover according to claim 5 , wherein the composite tungsten oxide fine particle has an average particle diameter of 1 nm to 800 nm.

8. The heat ray absorbing lamp cover according to claim 4 , wherein the M represents at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba.

9. The heat ray absorbing lamp cover according to claim 5 , wherein the M represents at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba.

10. The heat ray absorbing lamp cover according to claim 6 , wherein the M represents at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba.

11. The heat ray absorbing lamp cover according to claim 7 , wherein the M represents at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba.

12. The heat ray absorbing lamp cover according to claim 4 , wherein the composite tungsten oxide particle is covered with a dispersant.

13. The heat ray absorbing lamp cover according to claim 5 , wherein the composite tungsten oxide particle is covered with a dispersant.

14. The heat ray absorbing lamp cover according to claim 6 , wherein the composite tungsten oxide particle is covered with a dispersant.

15. The heat ray absorbing lamp cover according to claim 7 , wherein the composite tungsten oxide particle is covered with a dispersant.

16. The heat ray absorbing lamp cover according to claim 8 , wherein the composite tungsten oxide particle is covered with a dispersant.

17. The heat ray absorbing lamp cover according to claim 9 , wherein the composite tungsten oxide particle is covered with a dispersant.

18. The heat ray absorbing lamp cover according to claim 10 , wherein the composite tungsten oxide particle is covered with a dispersant.

19. The heat ray absorbing lamp cover according to claim 11 , wherein the composite tungsten oxide particle is covered with a dispersant.

20. The heat ray absorbing lamp cover according to claim 1 , wherein the heat ray absorbing lamp cover is a lamp cover for covering a light source selected from one of an LED light source and a semiconductor laser.

Assignees

• Sumitomo Chemical Co

Inventors

• Wake Takao

Classifications

• C09K3/00 Primary

  Materials not provided for elsewhere · CPC title

• C08K2003/2258

  of tungsten · CPC title

• C08K3/22

  of metals · CPC title

• F21V3/04

  characterised by materials, surface treatments or coatings · CPC title

• F21S41/285

  Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805 · CPC title