Claims
- 1. A gas discharge lamp comprising:
- a light transmissive envelope including an inwardly extending ridge, a fluorescent coating disposed within the inner surface of said envelope, first and second electrodes disposed within said envelope, an ionizable gas filling said envelope, said gas becoming a charged plasma when a current flows between said first and second electrodes and causing fluorescence of said fluorescent coating;
- a conductive grid of at least 50 mesh/inch disposed within said envelope and in contact with said ridge, said grid being positioned so as to intercept substantially all of the current flowing between said first and second electrodes; and
- means for electrical connection to said grid.
- 2. The gas discharge lamp as claimed in claim 1 wherein said grid comprises a tungsten mesh of 50 to 180 mesh/inch.
- 3. The gas discharge lamp as claimed in claim 1 wherein said first and second electrodes comprise an anode and a cathode, said grid being disposed closer to said cathode than said anode.
- 4. A gas discharge lamp as claimed in claim 1 wherein said ridge in said envelope comprises an indentation in said envelope.
- 5. A gas discharge lamp as claimed in claim 1 further including an end cap having means for electrical connection to at least one of said electrodes and means for electrical connection to said grid.
- 6. The gas discharge lamp as claimed in claim 1 wherein said ionizable gas comprises mercury vapor.
- 7. A low pressure gas discharge lamp for generating visible light in an illumination system and having a light transmissive envelope, first and second electrodes disposed within said envelope, sodium vapor filling said envelope, conductive grid means of more than 50 mesh/inch disposed within said envelope so as to intercept substantially all of the electrons flowing between said electrodes and means for electrical connection to said grid and means for generating light of primarily the visible spectrum.
- 8. The lamp as claimed in claim 7 wherein said grid is formed of tungsten wire.
- 9. A gas discharge lamp comprising;
- a light transmissive envelope, a fluorescent coating disposed within the inner surface of said envelope, an anode and a cathode disposed within said envelope, an ionizable gas filling said envelope, said gas becoming a charged plasma when a current flows between said first and second electrodes and causing fluorescence of said fluorescent coating;
- a conductive grid disposed within said envelope said grid being disposed closer to said cathode than said anode, said grid being positioned so as to intercept substantially all of the current flowing between said first and second electrodes; and
- means for electrical connection to said rid.
- 10. The gas discharge lamp as claimed in claim 9 wherein said grid comprises a mesh of 50 to 180 mesh/inch.
- 11. A gas discharge lamp as claimed in claim 9 wherein said envelope includes an inwardly disposed indentation, said grid being disposed in contact with said indentation.
- 12. A gas discharge lamp as claimed in claim 9 further including an end cap having means for electrical connection to at least one of said electrodes and means for electrical connection to said grid.
- 13. The gas discharge lamp as claimed in claim 9 wherein said ionizable gas comprises mercury vapor.
Parent Case Info
This is a continuation of application Ser. No. 07/634,370, filed Dec. 27, 1990, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (4)
Number |
Date |
Country |
685386 |
Apr 1964 |
CAX |
8505489 |
Dec 1985 |
WOX |
554573 |
Oct 1977 |
SUX |
854597 |
Nov 1960 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
634370 |
Dec 1990 |
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