Reflector material for artificial light source

• US 4,933,823 A
• Filed: 06/19/1989
• Issued: 06/12/1990
• Est. Priority Date: 06/19/1989
• Status: Expired due to Term

• Current Assignee: CPFilms Inc. (Eastman Chemical Company)
• Original Assignee: Martin Processing, Inc. (Eastman Chemical Company)
• Inventors: Taylor, Alan
• Primary Examiner(s): Husar, Stephen F.
• Assistant Examiner(s): Cariaso, Alan
• Application Number:
  US07/367,612
• Time in Patent Office: 358 Days
• Field of Search: 350/641, 350/642, 428/458, 362/219, 362/260, 362/296, 362/307, 362/341, 362/347
• US Class Current: 362/341
• CPC Class Codes: F21V 17/101 permanently, e.g. welding, gluing or riveting
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21V 7/24 characterised by the material
• CPC Class Codes: F21V 7/28 characterised by coatings
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes
• CPC Class Codes: F21Y 2113/00 Combination of light sources
• CPC Class Codes: Y10T 428/31681 Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]

Abstract

A dust-resistant mirrored surface reflector for use with a source of artificial light is provided. The reflector comprises (i) a planar transparent substrate (such as a sheet of glass or plastic), (ii) a reflective metal layer coated onto one side of the substrate, and (iii) a transparent, conductive material layer (such as indium oxide, tin oxide, zinc oxide or indium-tin oxide) coated onto the other side of the substrate. The conductive material layer has an electrical resistance less than about 10¹² ohms per square.

Claims

1. The combination comprising:

(a) a source of artificial light;

(b) a reflector support having a front surface and a back surface;

(c) structural means for maintaining the reflector support in spatial relationship to the source of artificial light such that the front surface of the reflector support faces the source of artificial light; and

(d) a reflective composite material disposed on the front surface of the reflector support, the reflective composite material comprising;

(i) a planar, transparent substrate having first and second planar surfaces;

(ii) a reflective metal layer disposed on the first planar surface of the substrate; and

(iii) a transparent, conductive material layer disposed on the second surface of the substrate, the transparent conductive layer having an electrical resistance less than about 10¹² ohms per square;

the reflective composite material being disposed on the front surface of the reflector support such that the transparent conductive layer faces away from the reflector support and towards the source of artificial light.

2. The combination of claim 1 wherein the transparent conductive layer has an electrical resistance less than about 10⁹ ohms per square.

3. The combination of claim 1 wherein the source of artificial light is one or more fluorescent bulbs.

4. The combination of claim 1 wherein the substrate is a glass.

5. The combination of claim 1 wherein the substrate is a polymer.

6. The combination of claim 1 wherein the substrate is selected from the group of materials consisting of polyesters, polycarbonates and polymethylmethacrylates.

7. The combination of claim 1 wherein the substrate is PET polyester.

8. The combination of claim 1 wherein the reflective metal layer consists essentially of aluminum.

9. The combination of claim 1 wherein the reflective metal layer consists essentially of silver.

10. The combination of claim 1 wherein the reflective metal layer is between about two and about twelve microinches thick.

11. The combination of claim 1 wherein the transparent conductive material layer is comprised of a wide band-gap metal oxide semiconductor.

12. The combination of claim 1 wherein the transparent conductive material layer is chosen from the group of materials consisting of indium oxide, tin oxide, zinc oxide and indium-tin oxide.

13. The combination of claim 1 wherein the transparent conductive material layer is between about 0.1 and about one microinches thick.

14. The combination of claim 1 wherein the substrate and transparent conductive material layer together transmit greater than about 85% of visible light.

15. The combination of claim 1 wherein the reflective composite material reflects greater than about 90% of visible light.

16. The combination of claim 14 wherein the reflective composite material reflects greater than about 90% of visible light.

17. The combination comprising:

(a) a source of artificial light;

(b) a reflector support having a front surface and a back surface;

(c) structural means for maintaining the reflector support in spatial relationship to the source of artificial light such that the front surface of the reflector support faces the source of artificial light; and

(d) a reflective composite material disposed on the front surface of the reflector support, the reflective composite material comprising;

(i) a planar, transparent polymer sheet substrate having first and second planar surfaces and being between about 0.0005 and about 0.003 inches thick;

(ii) a reflective layer of silver having a thickness between about two and about twelve microinches and disposed on the first planar surface of the substrate;

(iii) a transparent, conductive material layer selected from the group of materials consisting of indium oxide, tin oxide, zinc oxide and indium-tin oxide, such transparent conductive material being disposed on the second surface of the substrate and having a thickness between about 0.1 and about one microinches thick;

the reflective composite material being disposed on the front surface of the reflective support such that the transparent conductive layer faces away from the reflector support and towards the source of artificial light.

18. A method of reflecting artificial light comprising the step of reflecting rays of article light with a reflective surface which is comprised of:

(a) a planar, transparent substrate having first and second planar surfaces;

(b) a reflective metal layer disposed on the first planar surface of the substrate; and

(c) a transparent, conductive material layer disposed on the second surface of the substrate, the transparent conductive material layer having an electrical resistance less than about 10¹² ohms per square;

the reflective surface being disposed relevant to the rays of artificial light such that the rays of artificial light first strike the transparent conductive material layer, pass through the transparent conductive layer and the transparent substrate and are reflected by the reflective metal layer.

19. The method of claim 18 wherein the transparent conductive material layer has an electrical resistance less than about 10⁹ ohms per square.