Transparent substrate provided with a stack of thin layers, application to thermal insulation and/or solar control glazings

• US 20010053439A1
• Filed: 07/20/2001
• Published: 12/20/2001
• Est. Priority Date: 08/12/1993
• Status: Active Grant

• Current Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Vitrage
• Inventors: Guiselin, Olivier, Petit, Pascal, Brochot, Jean-Pierre
• Granted Patent: US 6,673,427 B2
• Time in Patent Office: Days
• US Class Current: 428/213
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3613 Coatings of type glass/inorganic compound/metal/inorganic compound/metal/other
• CPC Class Codes: C03C 17/3618 Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3652 the coating stack containing at least one sacrificial layer to protect the metal from oxidation
• CPC Class Codes: C03C 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: C03C 2217/78 Coatings specially designed to be durable, e.g. scratch-resistant
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/2495 Thickness [relative or absolute]
• CPC Class Codes: Y10T 428/24967 Absolute thicknesses specified
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick

Abstract

The invention relates to a transparent substrate, more particularly of glass and having multiple thin layers on which are successively deposited;

i) a first dielectric material layer,

ii) a first layer having infrared reflection properties, particularly based on metal,

iii) a second dielectric material layer,

iv) a second layer having infrared reflection properties, particularly based on metal,

v) a third dielectric material year,

characterized in that the thickness of the first layer having infrared reflection properties corresponding to about 50 to 80%, particularly 55 to 75% and preferably 60 to 70% of that of the second layer having infrared reflection properties.

Claims

1. A transparent substrate having multiple thin layers comprising successively:

i) a first dielectric material layer;

ii) a first layer having infrared reflection properties;

iii) a second dielectric material layer;

iv) a second layer having infrared reflection properties;

v) a third dielectric material layer,

wherein a thickness of said first layer having infrared reflection properties is 50 to 80% of that of said second layer having infrared reflection properties.

2. The transparent substrate of

claim 1

, wherein the optical thickness of said second dielectric material layer is equal to or greater than 110% of the sum of the optical thicknesses of said first and third dielectric material layers.

3. The transparent substrate of

claim 2

, wherein the optical thicknesses of said first dielectric material layer and said third dielectric material layer are about equal.

4. The transparent substrate of

claim 1

, wherein the optical thickness of said first dielectric material layer is greater than the optical thickness of said third dielectric material layer;

and

wherein the optical thickness of said first layer corresponds to at least 110% of the optical thickness of said third layer.

5. The transparent substrate of

claim 4

, wherein the optical thickness of said second dielectric material layer is about equal to the sum of the optical thicknesses of said first and third dielectric layers.

6. The transparent substrate of any one of

claims 1

to

5

, wherein each of said layers having infrared reflection properties is surmounted by a thin, partly oxidized, barrier metal layer.

7. The transparent substrate of any one of

claims 1

to

5

, wherein each of said layers having infrared reflection properties are based on silver.

8. The transparent substrate of any one of

claims 1

to

5

, wherein at least one of said three dielectric material layers is a material selected from the group consisting of tantalum (V) oxide, tin (IV) oxide, zinc oxide, niobium (V) oxide, titanium (IV) oxide or mixtures of said oxides, or is constituted by oxide or mixtures of said oxides, or is constituted by a first tin (IV) oxide layer surmounted by a second layer of tantalum (V) oxide, niobium (V) oxide or titanium (IV) oxide.

9. The transparent substrate of any one of

claims 1

to

5

, wherein the thickness of said first layer having infrared reflection properties is between 7 and 9 nanometers.

10. The transparent substrate of any one of

claims 1

to

5

, wherein the thickness of said second layer having infrared reflection properties is between 11 and 13 nanometers.

11. The transparent substrate of any one of

claims 1

to

5

, wherein the optical thickness of said first and third dielectric material layers is between 60 and 90 nanometers;

and

wherein the optical thickness of said second dielectric material layer is between 140 and 170 nanometers.

12. The transparent substrate of

claim 1

wherein the thickness of said first layer having infrared reflection properties is 55 to 75% of that of said second layer having infrared reflection properties.

13. The transparent substrate of

claim 1

wherein a thickness of said first layer having infrared reflection properties is 60 to 70% of that of said second layer having infrared reflection properties.

14. The transparent substrate of

claim 1

, wherein the optical thickness of said second dielectric material layer is between about 110% to 120% of the sum of the optical thicknesses of said first and third dielectric material layers.

15. The transparent substrate of

claim 1

, wherein the optical thickness of said first dielectric material layer corresponds to at least 110% to 140% of the optical thickness of said third dielectric material layer.

16. The transparent substrate of

claim 1

, wherein the optical thickness of said first dielectric material layer corresponds to about 125% of the optical thickness of said third dielectric material layer.

17. The transparent substrate of

claim 6

, wherein said barrier metal layer is based on a material selected from the group consisting of titanium and nickel-chromium alloy.

18. The transparent substrate of

claim 6

, wherein said barrier metal layer has a thickness of from 1 to 3 nanometers.

19. A laminated glazing comprising the transparent substrate of any one of

claims 1

to

5

, wherein said laminated glazing has a light transmission T_L of about 70% and a color in external reflection in the blues or greens.

20. A multiple glazing comprising the transparent substrate according of any one of

claims 1

to

5

, wherein said multiple glazing has a light transmission (T_L) between 60 and 70% and a solar factor of 0.32 to 0.42.

21. The multiple glazing of

claim 20

, wherein said multiple glazing is a double glazing.

22. A multiple glazing comprising the transparent substrate according of any one of

claims 1

to

5

, wherein said multiple glazing has a color in external reflection in the blues.

23. The multiple glazing of

claim 22

, wherein said multiple glazing has a color in external transmission in the blues.

24. The multiple glazing of

claim 22

, wherein said dielectric material layers are tantalum (V) oxide.

25. The multiple glazing of

claim 22

, wherein said multiple glazing is a double glazing.

26. The multiple glazing according to

claim 22

, wherein said multiple glazing has an optical appearance in external reflection which remains virtually identical no matter what the incidence angle, the values of a* and b* in the colorimetry system remaining unchanged and below 3 and having a negative sign.