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:
Jul. 30, 2013
Filed:
Aug. 03, 2009
Peter Tjin Sjoe Kong Tsang, Eindhoven, NL;
Constantin Alexandru Opran, Eindhoven, NL;
Stuart Ronald Pill, Cramlington, GB;
Daniel Karl Pezzutti, Eindhoven, NL;
Peter Tjin Sjoe Kong Tsang, Eindhoven, NL;
Constantin Alexandru Opran, Eindhoven, NL;
Stuart Ronald Pill, Cramlington, GB;
Daniel Karl Pezzutti, Eindhoven, NL;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
The invention provides a lighting device comprising a housing. The housing comprises visible-light sources () arranged to generate visible light (), UV-lightsources () arranged to generate UV-light (), a light exit window () positioned to allow transmission of the visible light (), a photochromic layer () positioned upstream of the light exit window () and downstream of the visible light sources (), the photochromic layer () comprising at least one area with UV-photochromic material (), the UV-photochromic material () having a first color state and a second color state, and a control unit () connected to the UV-light sources () for controlling the UV-light sources (), wherein the UV-light sources are arranged to illuminate the photochromic layer (). The invention makes it possible to obtain dynamic light effects.