High pressure discharge lamp
AssigneeUshio Denki Kabushiki Kaisha
InventorsTakuya Tsukamoto, Takashi Yamashita, Hirohisa Iwabayashi
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Abstract
A high pressure discharge lamp comprises a pair of electrodes that face each other in an electric discharge container, wherein an electrode axis of each electrode is buried in a sealing portion, each electrode axis is joined to a metallic foil, two or more grooves are formed in an axis direction on a portion of the electrode axis, which corresponds to the sealing portion, an upper shoulder portion of each groove is formed in a shape of a curved surface, a diameter of the electrode axis is 0.3 mm to 1 mm, and a curvature radius of the curved surface upper shoulder portion is 5 μm-50 μm.
Claims3
A high pressure discharge lamp comprising:
- a pair of electrodes that face each other in an electric discharge container, each electrode having a cylindrical shape defining an outer cylindrical surface extending radially from and along a cylindrical axis,
- wherein an electrode axis of each electrode is buried in a sealing portion,
- wherein each electrode axis is joined to a metallic foil,
- wherein two or more grooves are formed in the outer cylindrical surface along an axis direction on a portion of the electrode axis, which contacts a silica glass sealing portion,
- wherein each groove extends in the longitudinal axis direction of the electrode,
- wherein an upper shoulder portion of each groove is formed in a shape of a curved surface,
- wherein a diameter of the electrode axis is 0.3 mm to 1 mm,
- wherein a curvature radius of the curved surface upper shoulder portion is 5 μm-50 μm,
- wherein the two or more grooves are spaced-apart from one another as viewed in radial cross-section such that an incremental section of the outer cylindrical surface spans juxtaposed ones of the two or more grooves and interconnects respective ones of the upper shoulder portions and
- wherein a plurality of the incremental sections of the outer cylindrical surface as viewed in radial cross-section extend radially equidistantly from the cylindrical axis.
Dependencies are inferred from the claim text.