Mirror and a method of making the same

• US 6,457,836 B1
• Filed: 02/08/2002
• Issued: 10/01/2002
• Est. Priority Date: 07/02/2001
• Status: Expired due to Term

• Current Assignee: RPX Corporation
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Weld, John David, Chandross, Edwin Arthur
• Primary Examiner(s): SIKDER, MOHAMMAD YUNUS
• Application Number:
  US10/071,381
• Time in Patent Office: 235 Days
• Field of Search: 359/883, 359/884, 359/838, 359/850, 359/852, 359/867, 359/900, 359/846, 359/847, 428/312.6, 428/314.8, 428/317.1
• US Class Current: 359/883
• CPC Class Codes: G02B 5/08 Mirrors vehicle mirrors involving special optical features B60R1/08

Abstract

A reflective element, such as a mirror, includes a substrate and a reflective layer formed thereon. The substrate comprises at least one thixotropic metal alloy, which is injected into a mold to form the shape desired for the reflective element. The reflective element may also include an interface layer comprising a thermoset material, such as an epoxy resin, formed between the substrate and the reflective layer to increase the smoothness of the substrate.

Claims

1. A method comprising:

forming a reflective layer on a substrate comprising a shaped thixotropic metal alloy.

2. The method of claim 1, wherein the step of forming a reflective layer on a substrate comprising a shaped thixotropic metal alloy comprises:

forming the substrate by injecting a slurry from the at least one thixotropic metal alloy into a mold.

3. The method of claim 2, wherein the step of forming the substrate comprises:

forming a polymeric interface layer on the substrate such that the reflective layer is formed on the polymeric interface layer.

4. The method of claim 3, wherein the polymeric interface layer is formed on a surface of the substrate, the surface free of a microscopic irregularity greater than +/−

(¼

) of the wavelength of electromagnetic energy reflected by the reflective layer.

5. The method of claim 3, wherein the step of forming a polymeric interface layer comprises:

applying a pre-polymer onto the substrate, the pre-polymer comprising a thermoset material;

pressing an interface mold onto the pre-polymer; and

curing the pre-polymer to form the polymeric interface layer.

6. The method of claim 5, wherein the pre-polymer is applied to a curved surface of the substrate, the curved surface having a radius about the same as a radius of the interface mold.

7. The method of claim 5, wherein the step of forming a reflective layer comprises depositing a metal layer on the polymeric interface layer by evaporating a reflective metal.

8. The method of claim 7, wherein the at least one thixotropic metal alloy comprises at least one of zinc, aluminum and magnesium, the thermoset material comprises an epoxy resin, and the reflective metal comprises at least one of gold, silver and aluminum.

9. A method of making a mirror, the method comprising:

forming a substrate by injecting at least one thixotropic metal alloy slurry into a mold, the at least one thixotropic metal alloy comprising at least one of zinc, aluminum and magnesium;

forming a polymeric interface layer, the step of forming a polymeric interface layer comprising;

applying a pre-polymer to a curved surface of the substrate, the pre-polymer comprising a thermoset material;

pressing an interface mold onto the pre-polymer, the interface mold having a radius about the same as a radius of the curved surface; and

curing the pre-polymer to form the polymeric interface layer; and

forming a reflective layer by evaporating a reflective metal, the reflective metal comprising at least one of gold, silver and aluminum, the reflective layer formed on a surface of the polymeric interface layer, the surface of the polymeric interface layer free of a microscopic irregularity greater than +/−

(¼

) of the wavelength of electromagnetic energy reflected by the reflective layer.

10. A method comprising:

forming a reflective layer on a thixotropic metal alloy substrate.

11. The method of claim 10, wherein the step of forming a reflective layer on a thixotropic metal alloy substrate comprises:

forming the substrate by injecting a slurry from the at least one thixotropic metal alloy into a mold.

12. The method of claim 11, wherein the step of forming the substrate comprises:

forming a polymeric interface layer on the substrate, the reflective layer formed on the polymeric interface layer.

13. The method of claim 12, wherein the polymeric interface layer is formed on a surface of the substrate.

14. The method of claim 13, wherein the surface is free of a microscopic irregularity greater than about +/−

(¼

) of a wavelength of electromagnetic energy reflected by the reflective layer.

15. The method of claim 11, wherein the step of forming a polymeric interface layer comprises:

applying a pre-polymer onto the substrate, the pre-polymer comprises a thermoset material;

pressing an interface mold onto the pre-polymer; and

curing the pre-polymer to form the polymeric interface layer.

16. The method of claim 15, wherein the pre-polymer is applied to a curved surface of the substrate.

17. The method of claim 16, wherein the curved surface has a radius about the same as a radius of the interface mold.

18. The method of claim 15, wherein the step of forming a reflective layer comprises depositing a metal layer on the polymeric interface layer by evaporating a reflective metal.

19. The method of claim 18, wherein the at least one thixotropic metal alloy comprises at least one of zinc, aluminum and magnesium.

20. The method of claim 18, wherein the thermoset material comprises an epoxy resin.

21. The method of claim 18, wherein the reflective metal comprises at least one of gold, silver and aluminum.

22. A method of making a mirror, the method comprising:

forming a substrate by injecting at least one thixotropic metal alloy slurry into a mold;

forming a polymeric interface layer; and

forming a reflective layer by evaporating a reflective metal.

23. The method of claim 22, wherein the at least one thixotropic metal alloy comprising at least one of zinc, aluminum and magnesium.

24. The method of claim 22, wherein the step of forming a polymeric interface layer comprises:

applying a pre-polymer to a curved surface of the substrate, the pre-polymer comprising a thermoset material;

pressing an interface mold onto the pre-polymer, the interface mold having a radius about the same as a radius of the curved surface; and

curing the pre-polymer to form the polymeric interface layer.

25. The method of claim 22, wherein the reflective metal comprises at least one of gold, silver and aluminum.

26. The method of claim 22, wherein the reflective layer is formed on a surface of the polymeric interface layer.

27. The method of claim 26, wherein the surface of the polymeric interface layer is free of a microscopic irregularity greater than about +/−

(¼

) of a wavelength of electromagnetic energy reflected by the reflective layer.