Metal halide lamp with gas-tight seal
AssigneeKoninklijke Philips Electronics N.V.
InventorHenricus Peter Maria Gubbels
Life of this patent
Estimating the term…
Abstract
The invention relates to a metal halide lamp provided with a discharge vessel having a ceramic wall, which vessel encloses a discharge space in which an electrode is positioned. The discharge vessel is closed off by a plug in which a lead-through element is sealed in a gastight manner by means of a sealing ceramic. The lead-through element forms an electrical connection from the electrode inside the discharge vessel to a current supply conductor outside the vessel. According to the invention, the lead-through element has a ceramic core which is sealed to the plug in a direct joint in a gastight manner by means of sealing ceramic. The core is provided with a metal envelope at either side of the direct joint, which envelopes are interconnected by a small metal strip.
Claims16
A metal halide lamp, comprising:
- a discharge vessel with a ceramic wall which encloses a discharge space in which an electrode is arranged, which discharge vessel is sealed off by a ceramic plug in which a lead-through element is fastened in a gastight manner by a sealing ceramic, said lead-through element serving to form an electrical connection between said electrode and a conductor outside said discharge vessel,
- wherein said lead-through element includes a ceramic core which is connected in a gastight manner to said ceramic plug by sealing ceramic in a direct joint and which is provided with metal envelopes on either side of said direct joint, which metal envelopes are interconnected by a strip-shaped connecting part.
A discharge vessel employed in a metal halide lamp, said discharge vessel comprising:
- a ceramic wall defining a discharge space;
- ceramic plug connected to one end of said ceramic wall;
- a ceramic core disposed within said ceraimic plug, said ceramic core including a first metal envelope connected to an electrode arranged in the discharge space;
- and
- a sealing ceramic connecting said first metal envelope to said ceramic plug in a gastight manner.
A discharge vessel employed in a metal halide lamp, said discharge vessel comprising:
- a ceramic wall defining a discharge space;
- a ceramic plug connected to one end of said ceramic wall;
- and
- a ceramic core connected to said ceramic plug, said ceramic core including an interconnection of a first metal envelope and a second metal envelope, said first metal envelope further connected to an electrode arranged in the discharge space, said second metal envelope further connected to a conductor arranged outside of the discharge space, and
- a sealing ceramic connecting said ceramic core to said ceramic plug in a gastight manner.
Dependencies are inferred from the claim text.