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1. (WO2016050687) A LIGHT CONCENTRATOR FOR USE IN A LIGHTING DEVICE

Pub. No.:    WO/2016/050687    International Application No.:    PCT/EP2015/072252
Publication Date: Fri Apr 08 01:59:59 CEST 2016 International Filing Date: Tue Sep 29 01:59:59 CEST 2015
IPC: G02B 6/00
F21V 8/00
F21K 99/00
Applicants: PHILIPS LIGHTING HOLDING B.V.
Inventors: VAN BOMMEL, Ties
HIKMET, Rifat Ata Mustafa
Title: A LIGHT CONCENTRATOR FOR USE IN A LIGHTING DEVICE
Abstract:
A light concentrator (1 1) is disclosed which comprises at least one lighting element (1) configured to emit light (32), an optical filter (3) arranged so as to receive light having a wavelength within a selected wavelength emission band via a light in-coupling surface (4) and configured to selectively transmit light incident on the light in-coupling surface through the optical filter and output the light via a light out-coupling surface (5), on a condition that the light incident on the light in-coupling surface has a wavelength within a selected wavelength transmission band, a light-redirection element (6) having a light- redirection surface (7) arranged substantially parallel in relation to the light out-coupling surface (5) of the optical filter so as to receive at least some of the light out-coupled via the light out-coupling surface (5), and configured to redirect light impinging on the light- redirection surface, and a light-guiding region (8), which is delimited at least by the light- redirection surface and the light out-coupling surface (5) of the optical filter, for guiding light out-coupled via the light out-coupling surface towards at least one light-exiting region (9) arranged substantially perpendicular to the light out-coupling surface (5) via which light may leave the light concentrator. The optical filter (3) is configured such that characteristics of the wavelength transmission band depend at least in part on the angle of incidence of light incident on the light in-coupling surface (4), and wherein the optical filter (3) is configured such that the wavelength transmission band for a selected angle or angles of incidence of light incident on the light in-coupling surface (4) at least in part overlaps with the wavelength emission band, whereby light incident on the light in-coupling surface (4) with an angle of incidence equal to or within the selected angle or angles of incidence of light is transmitted through the optical filter (3).