Patent ID: 7808167

Claim:
A high-pressure discharge lamp comprising: a luminescent material; an envelope including an arc tube portion having a first internal space in which the luminescent material is encapsulated, a pair of seal portions respectively extending from opposite ends of the arc tube portion and having second internal spaces, and a pair of base portions provided at borders of the seal portions for isolating the first internal space and the second internal spaces; a mount inserted in the second internal space of one of the seal portions, the mount including a metal foil, an electrode having one end protruding into the first internal space and the other end connected to one end of the metal foil through one of the base portions, an external lead pin having one end connected to the other end of the metal foil and the other end protruding outside of the one of the seal portions, and a pre-seal glass embedded in the second internal space of the one of the seal portions, the pre-seal glass including a metal foil sheathing portion in which the metal foil is sheathed, an electrode sheathing portion sheathing a portion of the electrode extending from the one end of the metal foil toward the one of the base portions and fused to the one of the base portions, and an external lead pin sheathing portion sheathing a portion of the external lead pin extending outwardly from the other end of the metal foil and hermetically fused to an internal surface of the one of the seal portions, and a clearance defined between the metal foil sheathing portion and the one of the seal portions; a conductor arranged around an outer periphery of the one of the seal portions for generating discharge between the conductor and the metal foil; an inert gas encapsulated in the clearance hermetically sealed between the electrode sheathing portion and the external lead pin sheathing portion; and a metal piece arranged within the clearance.