Illuminant for an LED lamp, and LED lamp

Patent metadata

Field	Value
Publication number	US-10823339-B2
Application number	US-201716349488-A
Country	US
Kind code	B2
Filing date	Mar 6, 2017
Priority date	Nov 18, 2016
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A light fixture for an LED lamp having a glass bulb and at least one light-emitting diode. The glass bulb is filled with a heat-conducting gas and the at least one light-emitting diode is arranged inside the glass bulb. The heat-conducting gas in the glass bulb has a pressure of at least 2.2 bar at room temperature.

First claim

The invention claimed is:

1. A light fixture configured to be arranged inside a light-emitting diode (LED) lamp, the light fixture comprising:
a glass bulb filled with a heat-conducting gas having a higher thermal conductivity than air and a pressure of at least 2.2 bar at room temperature, wherein the glass bulb is vacuum-sealed by a press or pinch seal such that the heat-conducting gas cannot escape therefrom;
at least one light-emitting diode (LED) arranged inside the glass bulb; and
at least one electrical connector that extends through the glass bulb from inside to outside the glass bulb such that the at least one LED inside the glass bulb is electrically connectable with the LED lamp outside the glass bulb.

2. The light fixture according to claim 1 , wherein the glass bulb contains a gaseous getter material selected from the group consisting of oxygen, a silane, and a combination of oxygen and a silane.

3. The light fixture according to claim 1 , wherein the glass bulb contains a solid getter material provided as at least one of a coating and a sintering material inside the glass bulb.

4. The light fixture according to claim 1 , wherein the heat-conducting gas includes at least one of helium and hydrogen.

5. The light fixture according to claim 1 , further comprising a circuit board inside the glass bulb, wherein the at least one light-emitting diode is arranged on the circuit board.

6. The light fixture according to claim 1 , further comprising a plurality of circuit boards inside the glass bulb, wherein the at least one light-emitting diode is arranged on each circuit board.

7. The light fixture according to claim 6 , wherein the plurality of circuit boards includes at least three circuit boards, and wherein the plurality of circuit boards are arranged on the lateral surfaces of an imaginary straight prism having an equilateral base surface.

8. The light fixture according to claim 1 , wherein the at least one light-emitting diode is at least partially embedded in a conversion material.

9. The light fixture according to claim 1 , further comprising a glass support inside the glass bulb, wherein the at least one light-emitting diode is arranged on the glass support between the glass support and the glass bulb.

10. The light fixture according to claim 9 , wherein the glass support has the shape of a tube, wherein the at least one light-emitting diode is arranged on an outer lateral surface of the glass support.

11. The light fixture according to claim 1 , further comprising at least one LED filament arranged inside the glass bulb, wherein the at least one light-emitting diode comprises a plurality of light-emitting diodes arranged on the at least one LED filament.

12. The light fixture according to claim 9 , further comprising a plurality of LED filaments regularly spaced-apart on an outer lateral surface of the glass support, wherein a main extension direction of each LED filament extends along an extension direction of the glass support.

13. A light-emitting diode (LED) lamp comprising:
a glass shell filled with a first heat-conducting gas having a higher thermal conductivity than air and a pressure of at least 1 bar at room temperature; and
a light fixture arranged inside the glass shell and comprising:
a glass bulb filled with a second heat-conducting gas having a higher thermal conductivity than air and a pressure of at least 2.2 bar at room temperature, wherein the glass bulb is vacuum-sealed by a press or pinch seal such that the second heat-conducting gas cannot escape therefrom;
at least one light-emitting diode (LED) arranged inside the glass bulb; and
at least one electrical connector that extends through the glass bulb from inside to outside the glass bulb such that the at least one LED inside the glass bulb is electrically connectable with the LED lamp outside the glass bulb;

wherein the pressure of the first heat-conducting gas is at least 0.5 bar lower than the pressure of the second heat-conducting gas at room temperature.

14. The LED lamp according to claim 13 , wherein the pressure of the first heat-conducting gas is at least 1 bar lower than the pressure of the second heat-conducting gas at room temperature.

15. The light fixture according to claim 1 , wherein the heat-conducting gas in the glass bulb has a pressure of at least 5.1 bar at room temperature.

16. The light fixture according to claim 1 , wherein the heat-conducting gas in the glass bulb has a pressure greater than 5.1 bar but at most 10 bar at room temperature.

17. The light fixture according to claim 1 , wherein the glass bulb contains a solid getter material provided as a mass of either a pure metal or an alloy inside the glass bulb.

18. The light fixture according to claim 1 , wherein the at least one electrical connector is configured to be electrically connectable with the LED lamp via a solder connection inside the LED lamp.

19. The light fixture according to claim 1 , wherein the at least one electrical connector is configured to be electrically connectable with the LED lamp via a pin connection inside the LED lamp.

20. The light fixture according to claim 19 , wherein the pin connection is provided as a G4 or a G9 pin connection.

21. The light fixture according to claim 1 , wherein the at least one LED is of a chip-on-board (COB) configuration.

22. The light fixture according to claim 1 , wherein the getter material comprises a solid getter material comprising at least one of zirconium (Zr) and an alloy of zirconium.

23. The LED lamp according to claim 13 , wherein the first heat-conducting gas has a pressure of 1 bar at room temperature.

Assignees

• Ledvance Gmbh

Inventors

• Heil Thomas
• Lang Heinz
• Rosenbauer Georg

Classifications

• F21V23/06

  the elements being coupling devices {, e.g. connectors} · CPC title

• F21V23/001

  the elements being electrical wires or cables · CPC title

• F21K9/66

  Details of globes or covers forming part of the light source · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V29/503

  of light sources (cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H10H20/858) · CPC title