Sputtered multi-layer color compatible solar control coating

• US 5,332,888 A
• Filed: 11/07/1988
• Issued: 07/26/1994
• Est. Priority Date: 08/20/1986
• Status: Expired due to Term

• Current Assignee: Libbey-Owens-Ford Co. (Eaton Corporation PLC.)
• Original Assignee: Libbey-Owens-Ford Co. (Eaton Corporation PLC.)
• Inventors: Tausch, Peter J., Goodman, Ronald D.
• Primary Examiner(s): Albritton, C. L.
• Application Number:
  US07/267,988
• Time in Patent Office: 2,087 Days
• Field of Search: 219/547, 219/522, 219/552, 219/553, 219/203, 219/548, 204/192.21, 427/163
• US Class Current: 219/547
• CPC Class Codes: B32B 17/10005 laminated safety glass or glazing
• CPC Class Codes: B32B 17/10018 comprising only one glass sheet
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10064 comprising at least two glass sheets, only one of which being an outer layer
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/1033 Laminated safety glass or glazing containing temporary protective coatings or layers
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B60S 1/026 using electrical means
• 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 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3642 the multilayer coating containing a metal layer
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3655 the multilayer coating containing at least one conducting layer
• CPC Class Codes: C03C 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3673 specially adapted for use in heating devices for rear window of vehicles
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: G02B 6/4457 Bobbins; Reels
• CPC Class Codes: H05B 2203/013 Heaters using resistive films or coatings
• CPC Class Codes: H05B 3/86 : the heating conductors being embedded in the transparent or reflecting material H05B3/845 takes precedence

Abstract

A glazing unit having incorporated therewith a solar control filter, comprising combinations of layers of transparent films adhered to the surface of a transparent glass sheet. A protective covering is provided over the coating stack. The coating stack includes at least three layers of zinc oxide and at least two layers of silver deposited alternately one upon another, with each layer of silver between two layers of zinc oxide. The glazing unit exhibits color compatibility in environments, where normally employed. The electrically conducting silver layers enable the coating stack to optionally be utilized as a defogging and deicing system for the unit.

Claims

1. A transparent, laminated window having improved defrosting capability comprising, in combination:

A) an optical element having a sheet resistivity of less than about 3 ohms per square containing;

(i) at least two electrically conductive metal layers;

(ii) at least one dielectric spacing layer between said conductive layers; and

(iii) a transparent substrate; and

(B) a bus bar electrically conductively associated with each conductive layer.

2. The window of claim 1 wherein the optical element has a sheet resistivity of less than 2.5 ohms per square.

3. The window of claim 2 wherein the transparent substrate for the optical element is glass.

4. The window of claim 2 having a visible transmission of at least 70%.

5. The window of claim 2 having a visible reflection of no more than 16%.

6. The window of claim 2 having a solar rejection of at least 50%.

7. A transparent, laminated window capable of transmitting at least 70% of visible light, rejecting at least 50% of solar radiation and having improved defrosting capability, said window comprising:

A) an optical element having a sheet resistivity less than 3 ohms per square containing;

(i) at least two electrically conductive metal layers;

(ii) at least one dielectric spacing layer between said conductive layers; and

(iii) a transparent substrate; and

(B) a bus bar electrically conductively associated with each conductive layer.

8. A transparent, laminated window having improved defrosting capability and reduced oblique viewing angle color reflectance comprising:

(A) an optical element having a sheet resistivity less than about 6 ohms per square and less than about 11% normal incidence reflection of at any wavelength between 400 and 700 nm, containing;

(i) at least two transparent, electrically conductive metal layers, each having a thickness of less than 150 angstroms;

(ii) at least one dielectric layer between said conductive layers;

(iii) a transparent substrate; and

(B) a bus bar electrically conductively associated with each conductive layer.

9. The window of claim 8 wherein sheet resistivity is less than about 3 ohms per square.

10. The window of claims 8 or 9 wherein each conductive layer is silver.

11. The window of claim 10 wherein the dielectric layers are titanium oxide.

12. A transparent, laminated window capable of transmitting at least 70% of visible light and having improved defrosting capability and reduced oblique viewing angle color reflectance comprising:

A) an optical element having a sheet resistivity less than 3 ohms per square and less than 11% normal incidence reflection at any wavelength between 400 and 700 nm light, said optical element comprising;

(i) at least two silver layers, each having a thickness of 100-130 angstroms;

(ii) at least one dielectric layer between said silver layers;

(iii) at least one dielectric layer against the exterior surfaces of the silver layers opposite to those in contact with the layers of (ii);

(iv) a transparent substrate; and

(B) a bus bar electrically conductively associated with each silver layer.