Method of fabricating an electrode for a discharge lamp and the

Details Method of fabricating an electrode for a discharge lamp and the Method of fabricating an electrode for a discharge lamp and the

1992-11-16

1993-10-26

Rowan, Kurt C.

Electric lamp or space discharge component or device manufacturi

Process

With start up, flashing or aging

445 26, 445 51, 313345, 313491, 427 77, H01J 904

Patent

active

052560953

ABSTRACT:
An electrode of a discharge lamp which has an improved adhesion between an emitter material and a filament is formed in accordance with the following method. That is, a Fe-Cr-Al alloy is used as the filament. The filament is placed in a heated oxidizing environment to precipitate an aluminum oxide layer uniformly in a surface thereof. Thus precipitated aluminum oxide layer has good adhesion with the filament without flaking thereof. The aluminum oxide layer is coated with triple carbonates consisting of barium carbonate, calcium carbonate and strontium carbonate, so that a carbonate coated filament is obtained. And then, the coated filament is heated in vacuum to reduce the carbonates to their alkaline earth oxides of the emitter material, and also to form a complex oxide consisting of the aluminum oxide and the alkaline earth oxides. Adhesion between the emitter material and the aluminum oxide layer is improved by the formation of the complex oxide, so that a lamp life of the discharge lamp is remarkably increased. On the other hand, since the Fe-Cr-Al alloy has a much higher specific resistance value than tungsten, the discharge lamp using the filament of the Fe-Cr-Al alloy can be operated by a small current, which in turn enables a lamp driving circuit to be reduced in size and weight.

REFERENCES:
patent: 1699639 (1929-01-01), Van Gessel
patent: 3612828 (1971-10-01), Siegla
patent: 4582980 (1986-04-01), Izzi
patent: 4836816 (1989-06-01), Bouchard et al.

Affiliated with

Also associated with

Rating

Method of fabricating an electrode for a discharge lamp and the does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of fabricating an electrode for a discharge lamp and the , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of fabricating an electrode for a discharge lamp and the will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-955170