Reflector

• US 20070002569A1
• Filed: 07/01/2005
• Published: 01/04/2007
• Est. Priority Date: 07/01/2005
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Ulmer, Kurt, Wu, Kuohua
• Granted Patent: US 7,507,002 B2
• Time in Patent Office: Days
• US Class Current: 362/345
• CPC Class Codes: C23C 28/00 Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
• CPC Class Codes: F21V 7/24 characterised by the material
• CPC Class Codes: F21V 7/28 characterised by coatings
• CPC Class Codes: H01J 61/025 Associated optical elements
• CPC Class Codes: H01J 61/35 provided with coatings on the walls thereof; Selection of materials for the coatings using coloured coatings H01J61/40; using luminescent coatings H01J61/42

Abstract

A method for forming a reflector includes depositing a decoupling material on an ultraviolet light and infra-red light absorption layer that is supported by a substrate which is spun.

Claims

1. A reflector comprising:

a substrate;

an ultraviolet light and infra-red light absorption layer on the substrate;

a de-coupling layer on the absorption layer, wherein the de-coupling layer is selected from a group of materials consisting of;

spun-on glass, methylsiloxane silicate, sodium silicate, TEOS and sol-gel material; and

an optical coating on the de-coupling layer.

2. The reflector of claim 1, wherein the substrate comprises a metal.

3. The substrate of claim 1, wherein the substrate comprises aluminum.

4. The reflector of claim 1, wherein the de-coupling layer is spin coated on the absorption layer.

5. The reflector of claim 1, wherein the de-coupling layer has a substantially uniform thickness across the absorption layer.

6. The reflector of claim 1, wherein the de-coupling layer has an outer surface having a smoothness of at least about 20 nanometers.

7. The reflector of claim 1, wherein the de-coupling layer has an extinction coefficient near zero.

8. The reflector of claim 1, wherein the de-coupling layer has a refractive index of between about 1.35 and about 1.55.

9. The reflector of claim 1, wherein the de-coupling layer has a thickness of between 2 microns and 10 microns.

10. The reflector of claim 1, wherein the absorption layer has a surface roughness about 1 micrometer.

11. The reflector of claim 1, wherein the absorption layer is selected from a group of materials consisting of:

carbon-based pigment, black anodized aluminum.

12. A lamp comprising:

a reflector including;

a substrate;

an ultraviolet and infra-red light absorption on the substrate;

a de-coupling layer on the absorption layer, wherein the de-coupling layer is selected from a group of materials consisting of;

spun-on glass, methylsiloxane silicate, sodium silicate, TEOS and sol-gel material; and

an optical coating on the de-coupling layer; and

a burner proximate the reflector.

13. The lamp of claim 12, wherein the light source comprises a high pressure arc burner.

14. A projector comprising:

a lamp including;

an ellipsoidal substrate;

an ultraviolet light and infra-red light absorption on the substrate;

a de-coupling layer on the absorption layer, wherein the de-coupling layer is selected from a group of materials consisting of;

spun-on glass, methylsiloxane silicate, sodium silicate, TEOS and sol-gel material; and

an optical coating on the de-coupling layer;

a burner proximate the reflector;

a light modulator; and

a color wheel through which light from the lamp passes before impinging the modulator.

15. A reflector comprising:

means for absorbing ultraviolet and infra-red light;

means for reflecting visible light; and

means for interfacing between the absorbing means and the reflecting means and for providing a smooth surface against the reflecting means wherein the means for interfacing comprises a material selected from a group of materials consisting of;

spun-on glass, methylsiloxane silicate, sodium silicate, TEOS and sol-gel material.

16. A method comprising:

emitting light including ultraviolet light, infra-red light and visible light within an envelope;

reflecting the visible light off an optical coating;

passing the infra-red light through the optical coating and through an interface layer having a smooth surface against the multilayer optical coating the interface layer selected from a group of materials consisting of;

spun-on glass, methylsiloxane silicate, sodium silicate, TEOS and sol-gel material; and

absorbing the ultraviolet light and infra-red light while in the envelope.

17. A method of forming a reflector comprising:

depositing a de-coupling material on an ultraviolet light and infra-red light absorption layer supported by substrate; and

spinning the substrate.

18. The method of claim 17 further comprising forming an optical coating on the de-coupling layer.

19. The method of claim 17, wherein comprising forming the absorption layer on the ellipsoidal substrate.

20. The method of claim 17 further comprising plugging an aperture extending through the substrate.

21. The method of claim 17, wherein spinning the substrate includes:

spinning the substrate at a first speed until the de-coupling material coats the absorption layer; and

spinning the substrate at a second greater speed after the de-coupling material has coated the absorption layer.

22. The method of claim 17 further comprising vertically orienting the substrate while spinning the substrate.

23. The method of claim 17 further comprising tilting the substrate while spinning the substrate.

24. The method of claim 17, wherein the de-coupling layer has a smoothness of at least about 20 nanometers.

25. The method of claim 17, wherein the de-coupling layer has an extinction coefficient of near zero.

26. The method of claim 17, wherein the substrate comprises a metal.