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:
Nov. 01, 2016
Filed:
May. 28, 2013
Koninklijke Philips N.v., Eindhoven, NL;
Erik Paul Boonekamp, Utrecht, NL;
Shufen Tsoi, Weert, NL;
Andreas Aloysius Henricus Duijmelink, Aarle-Rixtel, NL;
Gerardus Wilhelmus Gerbe Van Dreumel, Nijmegen, NL;
KONINKLIJKE PHILIPS ELECTRONICS N.V., Eindhoven, NL;
Abstract
According to an aspect of the present invention, a lighting device () is provided. The lighting device () comprises a wavelength converting layer () having a curved shape and a light source () arranged to emit light towards the wavelength converting layer (). The wavelength converting layer () intersects a plane extending through the light source () and being parallel with the optical axis of the light source (), at a curve given, in a polar coordinate system centered at the light source (), by the equation: R(φ)=k·I(φ)±D, wherein k is a constant, 0 is an angle with respect to said optical axis, /(φ) is a function defining a luminous intensity profile of the light source and D is a deviation ranging from zero to 20% of the maximum value of said curve, R. The present invention is advantageous in that the lighting device () has a more uniform color distribution of emitted light across the wavelength converting layer () and the risk of color gradients and artifacts is reduced.