Low-E coating with high visible transmission

• US 7,455,910 B2
• Filed: 06/29/2006
• Issued: 11/25/2008
• Est. Priority Date: 12/21/2001
• Status: Expired due to Term

• Current Assignee: Guardian Glass LLC (KOCH Industries Incorporated)
• Original Assignee: Guardian Industries Corporation (KOCH Industries Incorporated)
• Inventors: Stachowiak, Grzegorz
• Primary Examiner(s): Xu; Ling
• Application Number:
  US11/476,608
• Publication Number:
  US 20060246301A1
• Time in Patent Office: 880 Days
• Field of Search: 428/428, 428/432, 428/698, 428/699, 428/701, 428/702, 428/704
• US Class Current: 428/432
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• 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 17/3626 one layer at least containing a nitride, oxynitride, boronitride or carbonitride
• 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 2217/73 Anti-reflective coatings with specific characteristics
• CPC Class Codes: C03C 2217/734 comprising an alternation of high and low refractive indexes

Abstract

Coated articles are provided with an anti-reflection system(s) which enables high visible transmission and/or low visible reflection. Neutral color is also achievable in certain example embodiments. In certain example embodiments, the anti-reflection system(s) is used in conjunction with a double silver (Ag) layer stack which provides low sheet resistance and/or emissivity.

Claims

1. A coated article including a coating supported by a glass substrate, the coating comprising, from the glass substrate outwardly:

a first dielectric layer comprising niobium oxide;

a first contact layer comprising at least one of NiCr, an oxide of NiCr and a nitride of NiCr located over and contacting the first dielectric layer comprising niobium oxide;

a first IR reflecting layer comprising Ag located over and contacting the first contact layer;

a second dielectric layer comprising niobium oxide;

a third dielectric layer having an index of refraction n less than an index of refraction of at least one of the first and second dielectric layers;

a second contact layer comprising at least one of NiCr, an oxide of NiCr and a nitride of NiCr;

a second IR reflecting layer comprising Ag;

a fourth dielectric layer comprising silicon oxide; and

wherein the coated article has a visible transmission of at least 70% and a sheet resistance (R_s) of no greater than 10 ohms/square.

2. The coated article of claim 1, wherein the coated article has a visible transmission of at least 75%, and neutral transmissive and/or glass side reflective color.

3. The coated article of claim 1, wherein the third dielectric layer comprises tin oxide.

4. The coated article of claim 1, wherein the coated article has a visible transmission of at least 76.5%.

5. The coated article of claim 1, further comprising another dielectric layer comprising tin oxide provided between the fourth dielectric layer comprising silicon oxide and the second IR reflecting layer.

6. The coated article of claim 5, further comprising another dielectric layer comprising niobium oxide provided between the another dielectric layer comprising tin oxide and the second IR reflecting layer.

7. The coated article of claim 1, further comprising a contact layer comprising at least one of NiCr, an oxide of NiCr and a nitride of NiCr provided directly above and in contact with at least one of the IR reflecting layers.

8. The coated articles of claim 1, wherein each of the dielectric layers comprising niobium oxide includes Nb₂O₅.

9. The coated article of claim 1 wherein said first dielectric layer comprising niobium oxide is directly on and contacting the glass substrate.

10. A coated article including a coating supported by a glass substrate, the coating comprising, from the glass substrate outwardly:

a first dielectric layer comprising niobium oxide;

a first contact layer located over the first dielectric layer comprising niobium oxide;

a first IR reflecting layer comprising at least one of Ag and Au located over and contacting the first contact layer;

a second dielectric layer comprising niobium oxide;

a third dielectric layer having an index of refraction n less than an index of refraction of at least one of the first and second dielectric layers;

a second contact layer located over the third dielectric layer;

a second IR reflecting layer comprising Ag;

a fourth dielectric layer comprising at least one of tin oxide and silicon nitride; and

wherein the coated article has a visible transmission of at least 70% and a sheet resistance (R_s) of no greater than 10 ohms/square.

11. The coated article of claim 10, further comprising a contact layer including at least one of NiCr, an oxide of NiCr and a nitride of NiCr provided directly in contact with at least one of said IR reflecting layers.

12. The coated article of claim 10 wherein said first dielectric layer comprising niobium oxide is directly on and contacting the glass substrate.