Luminous body

• US 20140293647A1
• Filed: 06/16/2014
• Published: 10/02/2014
• Est. Priority Date: 02/11/2004
• Status: Abandoned Application

• Current Assignee: Philips Lighting Holding BV (Signify N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: GREINER, Horst
• Application Number:
  US14/305,109
• Publication Number:
  US 20140293647A1
• Time in Patent Office: Days
• US Class Current: 362/610
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/004 Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources

Abstract

A luminous body is described, in particular in the form of a planar lighting device for general lighting or for backlighting of displays, which luminous body comprises a plurality of light sources, for example LED elements, arranged in a housing, in particular an optical waveguide plate. The optical waveguide plate forms a first optical medium with a first optical scattering power, into which the light of the light sources is coupled. Furthermore, at least one second optical medium with a second optical scattering power is provided, such that the light propagating in the second optical medium is at least substantially coupled in from the first optical medium, and the scattering power of at least one of the media is chosen for the purpose of influencing the flow of light in the housing such that a given brightness distribution of the light on the light emission surface is achieved.

Claims

1. A luminous body comprising a housing with a light emission surface and a plurality of light sources arranged in the housing, wherein the housing comprises at least a first optical medium with a first optical scattering power, into which medium the light of the light sources is coupled, and at least a second optical medium with a second optical scattering power, such that the light propagating in the second optical medium is at least substantially coupled thereinto from the first optical medium, and wherein the scattering power of at least one of the media is chosen with a view to influencing the flow of light in the housing such that a predefinable brightness distribution of the light over the light emission surface is achieved.

2. A luminous body as claimed in claim 1, with at least one layer by means of which the second optical medium is screened off at least substantially against a direct incidence of the light originating from a light source.

3. A luminous body as claimed in claim 2, wherein the layer is a layer that reflects on both sides.

4. A luminous body as claimed in claim 1, wherein the second optical medium is introduced into a region between at least one light source and the light emission surface (4).

5. A luminous body as claimed in claim 1, wherein the first optical medium is an optical waveguide plate, and the light sources are arranged in at least one cavity of said optical waveguide plate.

6. A luminous body as claimed in claim 5, wherein the scattering power of the second optical medium is chosen such that it compensates at least substantially for the reduction in the flow of light in the first optical medium caused by at least one of the cavities provided in the first optical medium.

7. A luminous body as claimed in claim 5, wherein the second optical medium is introduced into at least one region between at least one cavity and the light emission surface.

8. A luminous body as claimed in claim 1, wherein the second optical medium comprises light-scattering particles.

9. A luminous body as claimed in claim 8, wherein the light-scattering particles are globules with an optical refractive index different from that of the surrounding material.

10. A luminous body as claimed in claim 8, wherein the light-scattering particles are regions created by a material change caused by the action of at least one laser beam.