High pressure discharge lamp and luminaire

Abstract

A high pressure discharge lamp comprises a light-transmissive ceramic discharge vessel having a swollen portion defining a discharge space and a pair of slender cylindrical portions formed in integral with the swollen portion and communicating with the swollen portion at opposite ends of the swollen portion, wherein the inner surface of the boundary portion between the swollen portion and the each slender cylindrical portion defines a discontinuous inflection, and a pair of the electrodes which penetrate the slender cylindrical portions of the light-transmissive ceramic discharge vessel and lie in the swollen portion of the light-transmissive ceramic discharge vessel at their distal ends, lead-conductors connected to the proximal ends of the electrodes, sealed in the light-transmissive ceramic discharge vessel at least at their mid-portions and exposing outside from the light-transmissive ceramic discharge vessel at their proximal ends, and a filling filled in the light-transmissive ceramic discharge vessel.

Dependencies are inferred from the claim text.