Electrode for discharge lamp

Details Electrode for discharge lamp Electrode for discharge lamp

1979-12-28

1982-03-09

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313311, 313213, 313218, 252521, H01J 114, H01J 1906, H01K 104

Patent

active

043191584

ABSTRACT:
An electrode for a discharge lamp such as high pressure metal vapor lamps and fluorescent lamps is improved by using an electron emission material comprising lanthanum oxide and yttrium oxide. The electron emission material can be a combination of lanthanum oxide and yttrium oxide with barium.strontium.calcium tungstate or an alkaline earth metal oxide including at least barium oxide.
When the electrode is used in a high pressure metal vapor discharge lamp, luminous flux maintenance percent in an initial lightening period is highly improved without forming a black deposition at an end of an arc tube.
When the electrode is used in a fluorescent lamp, a formation of a black deposition is prevented and a starting voltage is lowered.

REFERENCES:
patent: 4052634 (1980-09-01), Dekok

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