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US 7,605,541 B2Granted
External-electrode discharge lamp with no light leakage from external electrode portion
AssigneeNEC Corporation
InventorsMaki Minamoto, Seiichiro Fujioka
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Abstract
An external-electrode discharge lamp has a light-permeable, electrically insulative outer casing having a closed hollow space defined therein. A discharge medium is sealed in the outer casing. An external electrode is disposed on an outer surface of the outer casing for causing a dielectric barrier discharge in the discharge medium. The external electrode comprises a plate of an electrically conductive material and is brazed to the outer surface of the outer casing by a brazing material disposed fully circumferentially on the outer surface of the outer casing.
Claims5
An external-electrode discharge lamp comprising:
- a cylindrical glass bulb having a closed hollow space defined therein;
- a discharge medium sealed in said closed hollow space defined in said glass bulb;
- an external electrode disposed on an outer surface of each of opposite ends of said glass bulb for causing a dielectric barrier discharge in said discharge medium, said external electrode comprising a metal strip extending circumferentially on and around an outer surface of said glass bulb and having a C-shaped structure with opposite ends of the metal strip being spaced circumferentially from each other so as to form a gap;
- and
- a brazing material disposed fully circumferentially on a portion of the outer surface of said glass bulb on which said external electrode is positioned, including the gap between the opposite ends of said external electrode,
- wherein an inside diameter of said external electrode is smaller than an outside diameter of said glass bulb.
3 more elements
Dependencies are inferred from the claim text.