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:
Jun. 07, 2016
Filed:
Jan. 14, 2013
Koninklijke Philips N.v., Eindhoven, NL;
Lorenzo Feri, Eindhoven, NL;
Stephanus Joseph Johannes Nijssen, Eindhoven, NL;
Tommaso Gritti, Eindhoven, NL;
Ruben Rajagopalan, Neuss, DE;
Frederik Jan De Bruijn, Eindhoven, NL;
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Abstract
The possibility to emit and detect coded light, whereby data is modulated into the light, is known. According to one aspect of the present disclosure, to reduce the risk of the modulation going undetected due to possible frequency blind spots in the detection spectrum, the lighting device () is arranged such that the frequency of its emitted modulated light () shivers around a base, or center, frequency. For example the modulated light (,,) may be transmitted using pulse-width-modulation, and the resulting pulse-width-modulation light signal () may thus have a period that fluctuates around the base period (T). The parameters determining the shivering of the modulated light () may be chosen such that visible flicker in the emitted modulated light () is avoided. According to another aspect, the lighting device () emits with a plurality of different modulation frequencies simultaneously.