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:
Mar. 18, 2008
Filed:
Dec. 19, 2003
Georg Henninger, Aachen, DE;
Georg Von Blanckenhagen, Aachen, DE;
Georg Henninger, Aachen, DE;
Georg Von Blanckenhagen, Aachen, DE;
Koninklijke Philips Electronics, N.V., Eindhoven, NL;
Abstract
The invention relates to a non-automotive-headlight lamp () comprising a lighting element () and a transparent bulb (), which is at least partly equipped with an interference coating () for e.g. changing the color or color temperature of the lamp (), and to a lighting unit () comprising such a lamp () being mounted in a reflector (). But the invention is also related to lighting units () where the interference coating () is not applied to the lamp () but to the reflector (). In these lamps () or lighting units () light components () not appropriately filtered by the interference coating () lead to undesired wavelengths in the illumination beam and/or to a compromised color uniformity of the beam. Such light components () may stem from missing or insufficient filters on part of the lamp (), from non-normal incidence of the rays () on the filter (), and, in reflectors () with interference coating (), from direct light () not hitting the reflector (). The invention adds a blocking device () to the lamp () or lighting unit () to substantially prevent these light components () to enter the illumination beam. Whereas constructively similar blocking devices () are known from automotive headlight lamps for preventing glare their benefits in the context of interference coatings () were overlooked in the prior art.