The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 19, 2015
Filed:
Sep. 12, 2013
Koninklijke Philips N.v., Eindoven, NL;
Michael Haacke, Aachen, DE;
Martin Stroesser, Aachen, DE;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
In order to achieve a discharge lamp suited to operate under reduced nominal power of e.g. 20-30 W, a lamp is proposed with two electrodes () arranged at a distance in a discharge vessel () for generating an arc discharge. The discharge vessel () has a filling with a substantially free of mercury and comprises a metal halide and a rare gas. The lamp () further comprises an outer bulb () arranged around the discharge vessel at a distance (d). The outer bulb () is sealed and has a gas filling of a thermal conductivity (λ). The inner diameter (d) of the discharge vessel is preferably in a range from 2-2.7 mm. The wall thickness (w) is in a range from 1.4-2 mm. A heat transition coefficient (λ/d) is calculated as thermal conductivity (λ) at 800° C. of the outer bulb filling divided by the distance (d). The so-defined heattransition coefficient is below 150 W/(mK).