High intensity discharge lamps with dosing aid

Patent metadata

Field	Value
Publication number	US-9437615-B2
Application number	US-201414296166-A
Country	US
Kind code	B2
Filing date	Jun 4, 2014
Priority date	Jun 4, 2014
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

A ceramic metal halide lamp according to various embodiments can include a discharge vessel and an ionizable fill. The ionizable fill is sealed within the discharge vessel. The ionizable fill includes an oxygen dispenser to introduce oxygen in a form of a pellet into the discharge vessel in a controlled manner to facilitate a tungsten halogen wall cleaning cycle. The pellet comprises aluminum-oxide and molybdenum-oxide.

First claim

We claim:

1. A ceramic metal halide lamp, comprising:
a discharge vessel; and
an ionizable fill sealed within the discharge vessel, the ionizable fill comprising:
an oxygen dispenser to introduce oxygen in a form of a pellet into the discharge vessel in a controlled manner to facilitate a tungsten halogen wall cleaning cycle; and
the pellet comprises aluminum-oxide and molybdenum-oxide.

2. The lamp of claim 1 , wherein the oxygen dispenser is controlled to accurately dose a concentration of the oxygen into the discharge vessel.

3. The lamp of claim 1 , wherein the molybdenum-oxide is molybdenum-trioxide (MoO 3 ).

4. The lamp of claim 1 , wherein the pellet comprises a spongy structure.

5. The lamp of claim 1 , wherein the pellet comprises a spongy aluminum-oxide structure defining a plurality of interstitial voids containing a dosing component, which comprises the molybdenum-oxide.

6. The lamp of claim 1 , wherein the pellet has a spheroidal configuration.

7. The lamp of claim 1 , wherein the pellet has a solid aluminum-oxide sphere configuration containing a dose component deposited on an external surface of the pellet and the dose component comprises the molybdenum-oxide.

8. The lamp of claim 1 , wherein the pellet further comprises an excess metal for gettering unwanted impurities in the discharge vessel.

9. The lamp of claim 1 , wherein the pellet is selected to have a diameter smaller than a diameter of a dosing tube connected to the discharge vessel.

10. A method of forming a ceramic halide lamp, comprising:
providing a discharge vessel; and
sealing an ionizable fill within the discharge vessel, the ionizable fill comprising:
an oxygen dispenser to introduce oxygen in a form of a pellet into the discharge vessel in a controlled manner to facilitate a tungsten halogen wall cleaning cycle; and
the pellet comprises aluminum-oxide and molybdenum-oxide.

11. A method of claim 10 , further comprising preparing the pellet using a pellet preparation process comprising the steps of:
mixing aluminum-oxide and molybdenum-oxide with a binder to form a mixture;
pressing the mixture to form a pellet;
heat treating the pellet to remove the binder from the pellet; and
grinding the pellet to form the pellet having a spheroidal shape.

12. The method of claim 10 , further comprising controlling the oxygen dispenser to accurately dose a concentration of the oxygen into the discharge vessel.

13. The method of claim 10 , wherein the molybdenum-oxide is molybdenum-trioxide (MoO 3 ).

14. The method of claim 10 , wherein the pellet has a spongy structure.

15. The method of claim 10 , wherein the pellet has a spongy aluminum-oxide structure defining a plurality of interstitial voids containing a dosing component, which comprises the molybdenum-oxide.

16. The method of claim 10 , wherein the pellet has a spheroidal configuration.

17. The method of claim 10 , wherein the pellet is formed having a solid aluminum-oxide sphere configuration containing a dose component deposited on an external surface of the pellet and the dose component comprises the molybdenum-oxide.

18. The method of claim 10 , further comprising selecting the pellet having a diameter smaller than a diameter of a dosing tube connected to the discharge vessel.

19. A method of preparing a dosing pellet, comprising:
mixing aluminum-oxide and molybdenum-oxide with a binder to form a mixture;
pressing the mixture to form a pellet;
heat treating the pellet to remove the binder from the pellet; and
grinding the pellet to form the pellet having a spheroidal shape.

Assignees

• Gen Electric

Inventors

• Boroczki Agoston
• Horvath Peter
• Kerenyi Istvan
• Sebok Sandor
• Inczedy Anna

Classifications

• C04B2235/94

  Products characterised by their shape · CPC title

• H01J61/302

  characterised by the material of the vessel · CPC title

• H01J61/26

  Means for absorbing or adsorbing gas, e.g. by gettering; Means for preventing blackening of the envelope · CPC title

• C04B2235/3256

  Molybdenum oxides, molybdates or oxide forming salts thereof, e.g. cadmium molybdate · CPC title

• H01J9/26

  Sealing together parts of vessels · CPC title