High-pressure discharge lamp having a ceramic discharge vessel, sintered body suitable therefor, and method for producing the sintered body

US5625256A · kind A · utility

Assignees

• Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE
• NGK INSULATORS, LTD. · JP

Inventors

• Rita Tiedt · Mering, DE
• Helmut Weske · Berlin, DE
• Koichiro Maekawa · Ichinomiya, JP
• Junichi Doi · Hiroshima, JP

Key dates

• Filing date: Nov 29, 1994
• Grant date: Apr 29, 1997
• Expiry date: Nov 29, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/661
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A ceramic discharge vessel (6) for a high-pressure discharge lamp (1) made from a sintered body of optically translucent polycrystalline alumina ceramic which is doped with only 100-800 ppm MgO, only 200-1200 ppm ZrO.sub.2 and only 10-300 ppm Y.sub.2 O.sub.3 (by weight). This improves the loading capacity and operating characteristics of the vessel and of the lamp.