Patent · US Expired

High pressure discharge lamp with improved arc tube retention structure

US4837477A · kind A · utility

3Cited by

3References

22Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Joachim Dassler · Berlin, DE
Detlef Girod · Berlin, DE
Klaus Krämer · Baudenbach, DE
Ingrid Liesch · Berlin, DE

Key dates

Filing date	Feb 5, 1988
Grant date	Jun 6, 1989
Priority date	—
Expiry date	Feb 5, 2008

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/34
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

To retain an arc tube (6, 16) in precise position with respect to an opti system (R) within an outer envelope (2, 12), the arc tube is retained at both ends by spiral springs (23) which have a cylindrical portion fitted in a sleeve-like current supply (7, 17) to the arc tube and having a conically expanding portion (25), terminating in an end portion (26) which is welded to a central guide pin (27) fitted and movable within the cylindrical portion (24) of the spring. The guide pin (27) can form part of an internal current supply (FIG. 3: 19) or be secured to an internal current supply lead (FIGS. 1, 2: 9).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.