Patent · US Expired

Lamp with improved lamp profile

US7649320B2 · kind B2 · utility

0Cited by

1References

24Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Lukas Kupper · Aachen, DE
Michael Haacke · Aachen, DE

Key dates

Filing date	Mar 1, 2005
Grant date	Jan 19, 2010
Priority date	—
Expiry date	Jul 9, 2025

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/30
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A lamp, containing ≦100 ppm Hg, includes a burner chamber having an axis, the axis having a section ≧0.05 mm. The burner chamber has a recess oriented toward a light arc produced in the burning chamber to suppress arc curvature. The lamp has an arc-luminescence profile of luminescence (measured in cd/m2)/mm with an average slope over that section which is ≧|300,000,000| (cd/m2)/mm. Preferably, the profile maximum value is ≧90,000,000 cd/m2. In one embodiment, the arc-making device includes two electrodes disposed for producing the light arc across their two tips, the depth of the recess being sufficiently small so as not to extend between the two tips.

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