Low-E coating with high visible transmission

• US 20060246301A1
• Filed: 06/29/2006
• Published: 11/02/2006
• Est. Priority Date: 12/21/2001
• Status: Active Grant

• Current Assignee: Guardian Glass LLC (KOCH Industries Incorporated)
• Original Assignee: Guardian Industries Corporation (KOCH Industries Incorporated)
• Inventors: Stachowiak, Grzegorz
• Granted Patent: US 7,455,910 B2
• Time in Patent Office: Days
• 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

1-34. -34. (canceled)

35. 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 contact layer comprising at least one of NiCr, NiCrO_x and NiCrN_x;

a first IR reflecting layer comprising Ag;

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 contact layer comprising at least one of NiCr, NiCrO_x and NiCrN_x;

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.

36. The coated article of claim 35, wherein the coated article has a visible transmission of at least 75%, and neutral transmissive and/or glass side reflective color.

37. The coated article of claim 35, wherein the third dielectric layer comprises tin oxide.

38. The coated article of claim 35, wherein the coated article has a visible transmission of at least 76.5%.

39. The coated article of claim 35, further comprising another dielectric layer comprising tin oxide provided between the fourth dielectric layer comprising silicon oxide and the second IR reflecting layer.

40. The coated article of claim 39, further comprising another dielectric layer comprising niobium oxide provided between the another dielectric layer comprising tin oxide and the second IR reflecting layer.

41. The coated article of claim 35, further comprising a contact layer comprising at least one of NiCr, NiCrO_x and NiCrN_x provided directly above and in contact with at least one of the IR reflecting layers.

42. The coated articles of claim 35, wherein each of the dielectric layers comprising niobium oxide includes Nb₂O₅.

43. 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 IR reflecting layer comprising at least one of Ag and Au;

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 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.

44. The coated article of claim 43, further comprising a contact layer including at least one of NiCr, NiCrO_x and NiCrN_x provided directly in contact with at least one of said IR reflecting layers.

45. 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 IR reflecting layer comprising at least one of Ag and Au;

a second dielectric layer comprising niobium oxide;

a second IR reflecting layer comprising Ag;

a third dielectric layer comprising niobium oxide;

a fourth dielectric layer comprising at least one of silicon oxide, silicon oxynitride, 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.

46. The coated article of claim 45, further comprising a contact layer including at least one of NiCr, NiCrO_x and NiCrN_x provided directly in contact with at least one of said IR reflecting layers.

47. The coated article of claim 45, further comprising another dielectric layer comprising tin oxide located between the second IR reflecting layer and the second dielectric layer.

48. The coated article of claim 45, wherein the fourth dielectric layer comprises SiO₂.

49. The coated article of claim 45, wherein the fourth dielectric layer comprises silicon oxynitride.

50. The coated article of claim 49, wherein the fourth dielectric layer comprising silicon oxynitride is at least one of oxidation graded and nitrogen graded, so that an index of refraction n of the fourth dielectric layer comprising silicon oxynitride changes from a first value in a first portion of the fourth dielectric layer to a smaller second value in a second portion of the fourth dielectric layer, wherein the second portion of the fourth dielectric layer comprising silicon oxynitride with the smaller index of refraction n is further from the IR reflecting layers than is the first portion of the fourth dielectric layer.

51. The coated article of claim 45, wherein the fourth dielectric layer comprises silicon nitride.

52-60. -60. (canceled)