Modified spectrum incandescent lamp

Patent metadata

Field	Value
Publication number	US-9607821-B2
Application number	US-201213476452-A
Country	US
Kind code	B2
Filing date	May 21, 2012
Priority date	Sep 13, 2011
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

There is herein described a lamp having a light-transmissive envelope, a tungsten-halogen capsule and a coating disposed on the surface of the light-transmissive envelope or doped in the light-transmissive material. The light-transmissive envelope may comprise a light-transmissive material. The tungsten-halogen capsule can be positioned inside the light-transmissive envelope.

First claim

What is claimed is:

1. A lamp having a rated wattage, the lamp comprising:
a light-transmissive envelope comprising a light-transmissive material;
a tungsten-halogen capsule housing a tungsten filament, wherein said tungsten-halogen capsule is housed inside the light-transmissive envelope; and
a coating being disposed on a surface of the light-transmissive envelope or doped in the light-transmissive material, a concentration of the coating being arranged so that the lamp has a color rendering index of at least 50, the lamp has a correlated color temperature from 2400K to 2800K, and the lamp has a lumen per watt of at least 75% of a general service incandescent lamp having the rated wattage's lumen per watt wherein the coating decreases the correlated color temperature of the lamp and wherein the coating comprising about 67.5-66% precipitated silica, 30.5-29.5% aluminum silicate pigment, 0.35-2.44% CrSn pink, 0.05-0.36% red iron oxide, and 1.6-1.75% coupling agents.

2. The lamp of claim 1 , wherein the tungsten-halogen capsule comprises:
an inert gas and
a halogen gas.

3. The lamp of claim 1 , wherein the rated wattage is 72 watts.

4. The lamp of claim 1 , wherein the rated wattage is 42 watts.

5. The lamp of claim 1 , wherein the lamp has the color rendering index between 97-100.

6. The lamp of claim 1 , wherein the lamp produces between 1100-1500 lumens.

7. The lamp of claim 1 , wherein the coating colorant comprising aluminum silicate pigment, titanium dioxide, CrSn pink, and red iron oxide.

8. The lamp of claim 1 , wherein the coating comprising precipitated silica, aluminum silicate pigment, titanium dioxide, CrSn pink, red iron oxide, and coupling agents.

9. The lamp of claim 1 , wherein the coating comprising about 66.75% precipitated silica, 30% aluminum silicate pigment, 1.4% CrSn pink, 0.2% red iron oxide, and 1.68% coupling agents.

10. The lamp of claim 1 , wherein the concentration of the coating is arranged so that the lamp has a correlated color temperature at 2800K.

11. The lamp of claim 2 , wherein the halogen gas is an iodine or a bromine.

12. A lamp having a rated wattage, the lamp comprising:
a light-transmissive envelope comprising a light-transmissive material;
a tungsten-halogen capsule having within said tungsten-halogen capsule a filament adapted to emit light wherein said tungsten-halogen capsule is housed inside the light-transmissive envelope; and
a coating being disposed on a surface of the light-transmissive envelope or doped in the light-transmissive material, a concentration of the coating being arranged so that the lamp has a color rendering index of at least 50, reduces a correlated color temperature of light emitted from the tungsten-halogen capsule to between 2400K and 2800K, the lamp has a color point with (x,y) chromaticity coordinates on a CIE 1931 chromaticity diagram that lies below a black-body locus, and the color point with (x,y) chromaticity coordinates on the CIE 1931 chromaticity diagram lies at least 4 MacAdam steps distant from a color point of the filament-emitted light and wherein the coating comprising about 675-66% precipitated silica, 30.5-29.5% aluminum silicate pigment, 0.35-244% CrSn pink, 0.05-0.36% red iron oxide, and 1.6-1.75% coupling agents.

13. The lamp of claim 12 , wherein the coating colorant comprising aluminum silicate pigment, CrSn pink, and red iron oxide.

14. The lamp of claim 12 , wherein the coating comprising about 66.75% precipitated silica, 30% aluminum silicate pigment, 1.4% CrSn pink, 0.2% red iron oxide, and 1.68% coupling agents.

15. The lamp of claim 12 , wherein the concentration of the coating is arranged so that the lamp has a correlated color temperature at 2800K and the lamp has a lumen per watt of at least 75% of a general service incandescent lamp having the rated wattage's lumen per watt.

16. A lamp having a rated wattage, the lamp comprising:
a light-transmissive envelope comprising a light-transmissive material;
a tungsten-halogen capsule housing a tungsten filament, wherein said tungsten-halogen capsule is inside the light-transmissive envelope; and
a coating being disposed on a surface of the light-transmissive envelope or doped in the light-transmissive material, the coating being arranged to increase a y coordinate of a color point of the lamp to greater than 0.40 for (x,y) chromaticity coordinates on a CIE 1931 chromaticity diagram and the lamp has a lumen per watt of at least 75% of a general service incandescent lamp having the rated wattage's lumen per watt and wherein a concentration of the coating colorant between 15% and 20% wherein the coating comprising about 675-66% precipitated silica, 30.5-29.5% aluminum silicate pigment, 0.35-2.44% CrSn pink, 0.05-0.36% red iron oxide, and 1.6-1.75% coupling agents.

17. The lamp of claim 16 , wherein the lamp has a correlated color temperature from 2400K to 2800K.

Assignees

• Levin Robert E
• Blose Ronald
• Comtois Richard
• Osram Sylvania Inc

Inventors

• Levin Robert E
• Blose Ronald
• Comtois Richard

Classifications

• H01J5/08

  provided with coatings on the walls thereof; Selection of materials for the coatings (luminescent coatings H01J1/62) · CPC title

• Y02B20/125

  Cross-Sectional Technologies · mapped topic

• H01K1/32 Primary

  provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof · CPC title

• H01K1/34

  Double wall vessels · CPC title

• H01J61/40

  by light filters; by coloured coatings in or on the envelope · CPC title