Low-pressure discharge lamp

US7385353B2 · kind B2 · utility

Assignee

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

Inventors

• Richard C. Gamer · Arlington, US
• Achim Hilscher · Friedberg, DE
• Gerd H. Lieder · Pfaffenhofen an der Ilm, DE
• Viktor Malik · Brno, CZ
• Thomas Noll · Kipfenberg, DE
• Klaus Pankratz · Kandern, DE

Key dates

• Filing date: Jul 30, 2004
• Grant date: Jun 10, 2008
• Expiry date: Jul 30, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J61/0672
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

The invention relates to a low-pressure discharge lamp comprising a glass discharge vessel (1) which is substantially tubular in form and which is closed in a gas-tight manner on the ends thereof, a filling consisting of an inert gas mixture and quicksilver, in addition to an optional luminous coating on the inner wall of the discharge vessel (1). Two current supply inlets are respectively melted into the two ends of the discharge vessel (1), with a helical electrode secured thereto (5). The invention is characterized in that in order to increase the switching resistance of the lamp in a cold start operation, at least one other electrode (7,8) made of a conductive material is arranged in the region between the helical electrode (5) and the connecting end of the discharge vessel (1) and one end of said other electrode (7, 8) is electrically connected to one of the two current supply inlets (3,4).