Double-ended high-pressure discharge lamp

US5304892A · kind A · utility

Assignee

• Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

• Bernd Lewandowski · Feldafing, DE
• Dieter Franke · Munich, DE
• Walter Kiele · Munich, DE
• Juergen Begemann · Munich, DE
• Joern Dierks · Berlin, DE

Key dates

• Filing date: Sep 26, 1991
• Grant date: Apr 19, 1994
• Expiry date: Sep 26, 2011

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J61/366
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

To permit high lamp currents to be applied to lamp electrodes (5, 6) of a discharge vessel (2) from which two elongated necks (3, 4) extend via current supply leads (23, 35), the discharge vessel is first made as a generally rotation-symmetrical element, to which tubular cylindrical neck tubes (17) are sealed. A cylindrical plug element (26, 40) is placed in the neck tube adjacent the discharge vessel. A subassembly is then made of a core element, which can be constructed as a single or a composite structure of quartz glass, for example by telescopically fitting quartz glass tubes over a central core, and melt-sealing the tubes and core together. Molybdenum disks (7, 8; 22) are placed against the end faces of the core element, and a plurality, for example four, molybdenum connecting foils (11-16, 27) are secured to the circumferences of the disks, to axially connect them together. The subassembly is then introduced into the neck tube through the plug element, a further quartz glass tube is placed over the current supply lead (23) and formed with a bulbous enlargement, which is sealed to the interior of the neck portion. The basic lamp structure is now complete. neck portion, with t…