WO2005024478A1 - Lamp system - Google Patents

Lamp system Download PDF

Info

Publication number
WO2005024478A1
WO2005024478A1 PCT/IB2004/051652 IB2004051652W WO2005024478A1 WO 2005024478 A1 WO2005024478 A1 WO 2005024478A1 IB 2004051652 W IB2004051652 W IB 2004051652W WO 2005024478 A1 WO2005024478 A1 WO 2005024478A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
lamp system
optical waveguide
light source
scattering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2004/051652
Other languages
French (fr)
Inventor
Robert Peter Scholl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Intellectual Property and Standards GmbH
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Intellectual Property and Standards GmbH, Koninklijke Philips Electronics NV filed Critical Philips Intellectual Property and Standards GmbH
Priority to JP2006525972A priority Critical patent/JP2007505461A/en
Priority to EP04769908A priority patent/EP1673644A1/en
Priority to US10/570,543 priority patent/US7441934B2/en
Publication of WO2005024478A1 publication Critical patent/WO2005024478A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources

Definitions

  • the optical component comprises an optical waveguide with two different scattering centers.
  • First scattering centers scatter light from the first light source and second scattering centers scatter light from the second light source.
  • Light can be mixed as desired in this manner. Light mixing thus takes place by coupling-in into a planar optical waveguide. In such a waveguide, the light is totally reflected until it hits a scattering center, also denoted scattering point hereinafter.
  • the scattering center may be on the surface of the planar optical waveguide or in the interior thereof.
  • a homogeneous luminance distribution is achieved in that the density of the scattering points varies. It increases with an increasing distance from the first light source, a fluorescent lamp in this case.
  • the second scattering center 9 is arranged in an interior

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

The invention relates to a lamp system (21) with a first light source (23) which radiates light of a first chromaticity coordinate and with a second light source which radiates light of a second chromaticity coordinate, and with an optical component (22) for additively mixing the light of the two light sources (23, 24 to 28). According to the invention, the optical component (22) comprises an optical waveguide (22) with two different kinds of scattering centers (29, 30). The light can be mixed thereby as desired.

Description

Lamp system
The invention relates to a lamp system with a first light source which radiates light of a first chromaticity coordinate and with a second light source which radiates light of a second chromaticity coordinate, and with an optical component for additively mixing the light of the two light sources.
Such a lamp system is known from DE 200 07 134 Ul. A homogeneous mixing of the radiation of the light sources is achieved in that the lamp system radiates indirect light from all light sources at least partly. The directly emitted light of all light sources is incident on a deflection means, for example on a reflector, diffuser, or simply on the inner wall of the housing of the luminaire, whereby the radiation path is modified. The invention accordingly has for its object to provide a simple possibility of light mixing.
This object is achieved by the characterizing features of claim 1. According to the invention, the optical component comprises an optical waveguide with two different scattering centers. First scattering centers scatter light from the first light source and second scattering centers scatter light from the second light source. Light can be mixed as desired in this manner. Light mixing thus takes place by coupling-in into a planar optical waveguide. In such a waveguide, the light is totally reflected until it hits a scattering center, also denoted scattering point hereinafter. The scattering center may be on the surface of the planar optical waveguide or in the interior thereof. A homogeneous luminance distribution is achieved in that the density of the scattering points varies. It increases with an increasing distance from the first light source, a fluorescent lamp in this case. If two light sources of different colors are at a distance from one another, mixing of the light of the light sources of different colors into a white, homogeneous light source now leads to the problem that the one color is indeed homogeneously coupled out by means of the difference in scattering point density, but the other color is inhomogeneously coupled out by this scattering point density. If two different scattering centers are introduced, the one kind of scattering center scattering only light from the first light source and the other one light from the second light source, a homogeneous distribution can be achieved, and in particular white light can also be coupled out. The second kind of scattering center may yet be formed by two sub-types if one of the light sources radiates light with two different wavelengths, such that the one sub-type scatters green by preference and the other one blue. A possible effect by which such a color-selective scattering can be achieved is the so-called Mie scattering. The Mie theory states that the scattering behavior changes strongly when the particle size approximates the value of the wavelength to be scattered, or is smaller than the wavelength of the light to be scattered. In this case, the scattering coefficient depends on the size and shape of the scattering centers.
The invention will now be explained in more detail below with reference to an embodiment and to the drawing, in which: Fig. 1 shows a planar optical waveguide with a light source in perspective view, Fig. 2 shows the optical waveguide with the light source and a scattering center in lateral cross-section, Fig. 3 shows the optical waveguide with the light source and a second scattering center in lateral cross-section, Fig.4 shows the optical waveguide with the light source and with scattering centers in perspective view, Fig. 5 shows the optical waveguide with two different light sources arranged at a distance from one another and with scattering centers in perspective view, and Fig. 6 shows the optical waveguide with two light sources and with different scattering centers in perspective view.
Fig. 1 shows a lamp system 1 with a planar optical waveguide 2 and a light source 3 which is constructed as a fluorescent lamp. Fig. 2 shows the lamp system 1 with the optical waveguide 2 and the fluorescent lamp 3, which emits a light ray 4 that is passed on by a scattering center 5 into a space 6 that is to be illuminated. The scattering center 5, also denoted scattering point below, is provided at a surface 7 of the optical waveguide 2. Fig. 3 shows the lamp system 1 with the optical waveguide 2 and the fluorescent lamp 3, which emits a second light ray 8 which is passed on by a scattering center
9 into the space 6 to be illuminated. The second scattering center 9 is arranged in an interior
10 of the optical waveguide 2. Fig. 4 shows the lamp system 1 with the optical waveguide 2 and the fluorescent lamp 3. The optical waveguide 2 comprises scattering centers 5 and 9, wherein a density of these scattering centers 5, 9 varies. The scattering center density increases with an increase in distance to the fluorescent lamp 3. It is possible in this manner to distribute the blue-green light of the fluorescent lamp 3 homogeneously. Fig. 5 shows the optical waveguide 2 with the fluorescent lamp 3 and a second light source 11, which is formed by four red light-emitting diodes or LEDs 12 to 15. Light rays 16 originate from the fluorescent lamp 3, and light rays 17 originate from the LEDs 12 to 15 of the light source 11. The inhomogeneous density distribution of the scattering points 5 and 9 leads to a homogeneous blue-green light distribution, but to an inhomogeneous red light distribution. The color red is inhomogeneously coupled out. Fig. 6 shows a lamp system 21 with an optical waveguide 22, a fluorescent lamp 23, and a second light source 24 comprising several red LEDs 25 to 28, and two different scattering centers 29 and 30. The scattering centers 29 deflect substantially blue- green light rays of the fluorescent lamp 23. The density of the scattering centers 29 increases with their distance to the fluorescent lamp 23. The scattering centers 30 deflect substantially red light rays from the red LEDs 25 to 28 of the light source 24. The density of the scattering centers 30 increases as their distance to the light source 24 increases. The light sources 23 and 24 are arranged at two mutually opposed sides 31 and 32 of the optical waveguide 22. The arrangement and the density of the scattering centers 29 and 30 are accordingly chosen such that the optical waveguide 22 radiates white light in a direction 33. LIST OF REFERENCE NUMERALS
1 lamp system
2 planar optical waveguide
3 fluorescent lamp
4 light ray
5 scattering center
6 space
7 surface
8 light ray
9 scattering center
10 interior
11 light source
12 LED
13 LED
14 LED
15 LED
16 light rays
17 light rays
18
19
20
21 lamp system
22 optical waveguide
23 fluorescent lamp
24 second light source
25 red LED
26 red LED
27 red LED
28 red LED
29 scattering center
30 scattering center
31 lateral side
32 lateral side
33 direction

Claims

CLAIMS:
1. A lamp system (1, 21) with a first light source (3, 23) which radiates light (4, 8, 16) of a first chromaticity coordinate and with a second light source (11 to 15, 24 to 28) which radiates light (17) of a second chromaticity coordinate, and with an optical component (2, 22) for additively mixing the light (4, 8, 16, 17) of the two light sources (3, 11 to 15, 23, 24 to 28), characterized in that the optical component (2, 22) comprises an optical waveguide (2, 22) with scattering centers (5, 9, 29, 30) of two different kinds.
2. A lamp system as claimed in claim 1, characterized in that the optical waveguide (2, 22) is of planar construction.
3. A lamp system as claimed in claim 1, characterized in that the light from the light source (3, 11 to 15, 23, 24 to 28) can be coupled into the optical waveguide (2, 22).
4. A lamp system as claimed in claim 1, characterized in that the scattering center (5) is arranged on the surface (7) of the optical waveguide (2).
5. A lamp system as claimed in claim 1, characterized in that the scattering center (9) is arranged in the interior (10) of the optical waveguide (2).
6. A lamp system as claimed in claim 1, characterized in that a density of the scattering centers varies.
7. A lamp system as claimed in claim 6, characterized in that the density of the scattering centers increases with an increasing distance to the light source (3, 11 to 15, 23, 24 to 28).
8. A lamp system as claimed in claim 1, characterized in that the first light source (3, 23) comprises a fluorescent lamp (3, 23), and the second light source (11, 24) comprises a light-emitting diode (12 to 15, 25 to 28).
9. A lamp system as claimed in claim 8, characterized in that the fluorescent lamp (3, 23) radiates blue-green light.
10. A lamp system as claimed in claim 8, characterized in that the light-emitting diode (12 to 15, 25 to 28) radiates red light.
PCT/IB2004/051652 2003-09-11 2004-09-01 Lamp system Ceased WO2005024478A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2006525972A JP2007505461A (en) 2003-09-11 2004-09-01 Lamp system
EP04769908A EP1673644A1 (en) 2003-09-11 2004-09-01 Lamp system
US10/570,543 US7441934B2 (en) 2003-09-11 2004-09-01 Lamp system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03103350 2003-09-11
EP03103350.9 2003-09-11

Publications (1)

Publication Number Publication Date
WO2005024478A1 true WO2005024478A1 (en) 2005-03-17

Family

ID=34259279

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2004/051652 Ceased WO2005024478A1 (en) 2003-09-11 2004-09-01 Lamp system

Country Status (7)

Country Link
US (1) US7441934B2 (en)
EP (1) EP1673644A1 (en)
JP (1) JP2007505461A (en)
KR (1) KR20060123720A (en)
CN (1) CN100383575C (en)
TW (1) TW200520261A (en)
WO (1) WO2005024478A1 (en)

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WO2006114748A1 (en) * 2005-04-27 2006-11-02 Koninklijke Philips Electronics N.V. Backlighting system
EP2348353A4 (en) * 2008-11-14 2012-05-09 Lg Innotek Co Ltd METHOD FOR MANUFACTURING LCD DEVICES AND LIGHT GUIDING PANEL

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US7543957B1 (en) 2008-01-29 2009-06-09 General Electric Company Thermal management of LEDS integrated to compact fluorescent lamps
US20100220497A1 (en) * 2009-01-14 2010-09-02 Ngai Peter Y Y Luminaire having floating luminous light source
US8651692B2 (en) * 2009-06-18 2014-02-18 Intematix Corporation LED based lamp and light emitting signage
US8197105B2 (en) * 2009-08-13 2012-06-12 Intematix Corporation LED-based lamps
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US9217826B2 (en) 2011-10-11 2015-12-22 Corning Incorporated Multi-wavelength light source using light diffusing fibers
US9869432B2 (en) 2013-01-30 2018-01-16 Cree, Inc. Luminaires using waveguide bodies and optical elements
US9366396B2 (en) 2013-01-30 2016-06-14 Cree, Inc. Optical waveguide and lamp including same
US9625638B2 (en) 2013-03-15 2017-04-18 Cree, Inc. Optical waveguide body
US9690029B2 (en) 2013-01-30 2017-06-27 Cree, Inc. Optical waveguides and luminaires incorporating same
US10436969B2 (en) 2013-01-30 2019-10-08 Ideal Industries Lighting Llc Optical waveguide and luminaire incorporating same
US9442243B2 (en) 2013-01-30 2016-09-13 Cree, Inc. Waveguide bodies including redirection features and methods of producing same
US9291320B2 (en) 2013-01-30 2016-03-22 Cree, Inc. Consolidated troffer
US9798072B2 (en) 2013-03-15 2017-10-24 Cree, Inc. Optical element and method of forming an optical element
US9366799B2 (en) 2013-03-15 2016-06-14 Cree, Inc. Optical waveguide bodies and luminaires utilizing same
US10502899B2 (en) * 2013-03-15 2019-12-10 Ideal Industries Lighting Llc Outdoor and/or enclosed structure LED luminaire
US10379278B2 (en) * 2013-03-15 2019-08-13 Ideal Industries Lighting Llc Outdoor and/or enclosed structure LED luminaire outdoor and/or enclosed structure LED luminaire having outward illumination
US10436970B2 (en) 2013-03-15 2019-10-08 Ideal Industries Lighting Llc Shaped optical waveguide bodies
US9920901B2 (en) 2013-03-15 2018-03-20 Cree, Inc. LED lensing arrangement
US10400984B2 (en) 2013-03-15 2019-09-03 Cree, Inc. LED light fixture and unitary optic member therefor
US10209429B2 (en) 2013-03-15 2019-02-19 Cree, Inc. Luminaire with selectable luminous intensity pattern
CN103885117B (en) * 2014-03-10 2018-02-06 京东方科技集团股份有限公司 Light guide plate, backlight module and liquid crystal module
US12372219B2 (en) * 2014-05-30 2025-07-29 Cree Lighting Usa Llc LED luminaire with a cavity, finned interior, and a curved outer wall extending from a surface on which the light source is mounted
US11719882B2 (en) 2016-05-06 2023-08-08 Ideal Industries Lighting Llc Waveguide-based light sources with dynamic beam shaping
US10416377B2 (en) 2016-05-06 2019-09-17 Cree, Inc. Luminaire with controllable light emission
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KR102862427B1 (en) 2020-03-31 2025-09-18 코닝 인코포레이티드 Light guide panel and lighting device having the same
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Also Published As

Publication number Publication date
CN1849536A (en) 2006-10-18
CN100383575C (en) 2008-04-23
EP1673644A1 (en) 2006-06-28
US7441934B2 (en) 2008-10-28
TW200520261A (en) 2005-06-16
US20070081780A1 (en) 2007-04-12
KR20060123720A (en) 2006-12-04
JP2007505461A (en) 2007-03-08

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