EP2511595B1 - Phare doté d'un angle de diffusion à demi-intensité réduit - Google Patents

Phare doté d'un angle de diffusion à demi-intensité réduit Download PDF

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Publication number
EP2511595B1
EP2511595B1 EP11003198.6A EP11003198A EP2511595B1 EP 2511595 B1 EP2511595 B1 EP 2511595B1 EP 11003198 A EP11003198 A EP 11003198A EP 2511595 B1 EP2511595 B1 EP 2511595B1
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EP
European Patent Office
Prior art keywords
reflector
light
floodlight
shield
optical axis
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.)
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Application number
EP11003198.6A
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German (de)
English (en)
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EP2511595A1 (fr
Inventor
Heiko Römelt
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.)
Bega Gantenbrink Leuchten KG
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Bega Gantenbrink Leuchten KG
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Publication date
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Priority to EP11003198.6A priority Critical patent/EP2511595B1/fr
Publication of EP2511595A1 publication Critical patent/EP2511595A1/fr
Application granted granted Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V1/00—Shades for light sources, i.e. lampshades for table, floor, wall or ceiling lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/16—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using sheets without apertures, e.g. fixed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/12—Combinations of only three kinds of elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/06—Optical design with parabolic curvature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a headlamp, in particular a downlight, according to the preamble of the independent claims 1 and 7.
  • Such a headlamp comprises a reflector with a light inlet opening, a light exit opening and an optical axis. Furthermore, the headlamp comprises a light source arranged at the light inlet opening of the reflector and a tubular aperture.
  • the aperture is disposed within the reflector and concentric with the optical axis and has a first end and a second end. The first end of the tubular aperture faces the light entrance opening of the reflector. The first end of the tubular aperture is thus closer to the light entrance aperture of the reflector than the second end of the tubular aperture.
  • headlamps with a wide variety of light distributions are required.
  • headlamps are used for various lighting purposes, which radiate a highly concentrated light with a nearly parallel beam path or merely lightly opening beam path.
  • an ideal symmetrical, ie circular, light distribution is desired, such headlights can be described by the so-called half-beam angle. This angle indicates at which angle apart from the optical axis of the headlamp half of the maximum light intensity is reached. The smaller this angle, the closer the headlamp focuses the light.
  • the invention is therefore based on a headlamp with inner tubular aperture.
  • the obliquely emitted by the light source light which would otherwise be emitted through the light exit opening of the reflector, is absorbed by the inner panel. Due to the finite axial extent of the tubular aperture not all unwanted light can be absorbed. It goes without saying that the bundling of the headlight is better, the longer the reflector and aperture are made.
  • the bundling of the headlight of such known from the prior art headlight is relatively good even with relatively short reflectors or short overall length of the headlamp, the luminous efficacy and thus the efficiency of such headlights is not optimal, as a significant part of the light emitted from the light source Light is absorbed through the tubular aperture.
  • a light guide which plays the function of bundling.
  • a system is for example off DE 10340039 B4 known.
  • the light source shown there an LED
  • the light guide is solid and made of transparent plastic.
  • the light exit surface of the optical waveguide is convex, so that the obliquely emitted by the LED light is aligned almost parallel. Outside this central region, the light exit surface of the light guide body is conical.
  • the outer shape of the optical waveguide corresponds to the shape of a parabolic reflector and is embodied such that a total reflection of the light emitted by the light source takes place on this lateral surface.
  • the light is therefore deflected at this lateral surface obliquely in the direction of the optical axis and also diffracted at the exit from the conical light exit surface to a parallel beam path.
  • the US 2010/0254128 A1 discloses a radiator equipped with LEDs of different colors.
  • the spotlight has an outer reflector, in whose focal point an inner reflector is arranged.
  • the light emitted by the LEDs light is passed through a tubular light guide to the inner reflector, reflected there, and finally emitted from the outer reflector through the light exit opening of the radiator.
  • the headlight according to the invention should also be easy and inexpensive to manufacture.
  • the converging lens By the converging lens, a large part of the light emitted by the light source, which would be absorbed in headlamps of the type mentioned on the inside of the tubular aperture, be bundled so that it leaves the tubular aperture as a focused spotlight. As a result, far less light is absorbed by the diaphragm compared to the known from the prior art headlamps of the type mentioned. Thus, the light emitted by the light source can be better utilized, which significantly increases the efficiency of the headlamp according to the invention over that of the known from the prior art headlights.
  • the bundling lens also improves the focusing of the headlight.
  • the headlight according to the invention can be made extremely inexpensive and easy.
  • the following embodiments relate to the inventive solution with converging lens.
  • the converging lens is arranged at the first end of the diaphragm.
  • the first end of the aperture is along the optical axis of the headlamp or reflector at some distance from the light source, but the first end of the aperture is closer to the light source than the second end.
  • the condenser lens is disposed at the first end of the aperture, much of the light passing through the aperture can be diffracted such that it leaves the aperture as collimated spotlight.
  • the arrangement of the converging lens at the first end of the shutter thus prevents a significant portion of the light from being absorbed by the shutter. By this arrangement, therefore, a very good efficiency is achieved.
  • the converging lens is made plano-convex, with the flat side of the condenser lens facing the light source. As a result, the effective light output is further improved.
  • the plane side of the converging lens terminates with the first end of the diaphragm. This ensures on the one hand a simple installation and on the other hand a high efficiency.
  • the refractive power of the condenser lens is dimensioned such that the beam path of the light passing through the aperture of the light source corresponds in its extension transverse to the optical axis of the inner contour of the aperture.
  • the converging lens is arranged at a distance from the light source, which corresponds to the focal length of the converging lens.
  • the auxiliary reflector is arranged at the first end of the diaphragm.
  • the first end of the aperture is along the optical axis of the headlamp or reflector at some distance from the light source, but the first end of the aperture is closer to the light source than the second end. If the auxiliary reflector is arranged at the first end of the diaphragm, a large part of the light entering the diaphragm can be reflected by the additional reflector in such a way that it leaves the diaphragm as focused headlight light.
  • the arrangement of the additional reflector at the first end of the shutter thus prevents a considerable portion of the light from being absorbed by the shutter. By this arrangement, therefore, a very good efficiency is achieved.
  • the additional reflector is designed as a parabolic reflector. This achieves a very good bundling effect.
  • the additional reflector comprises a focal point, wherein the light source is located in the focal point of the additional reflector. Since the light source has a finite extent, it is to be understood that the light center of gravity of the light source should be in focus. Thus, much of the light emitted by the light source can be effectively used. The efficiency is particularly high in this case.
  • the following embodiments relate both to the solution according to the invention with additional reflector and to the solution according to the invention with condenser lens.
  • the tubular diaphragm is cylindrical. This shape of the aperture is particularly suitable for a strong focusing headlamp with extremely low half-beam angle and high efficiency.
  • the diaphragm is provided on its outer, the reflector-facing side with a light-absorbing coating.
  • the diaphragm is also provided internally with a light-absorbing coating.
  • the light source is an LED light source.
  • the optical properties of the headlight according to the invention or its arrangement can be used optimally.
  • FIG. 1 shows an oblique view of a headlamp 1 according to the invention, wherein the headlamp 1 is shown cut lengthwise.
  • the light source of the headlamp 1 is an LED 6, which is located in the light entrance opening 3 of the parabolic reflector 2.
  • the optical axis of the parabolic reflector 2 is designated by the reference numeral 5.
  • the LED 6 is located in the focal point of the parabolic reflector. 2
  • a tubular cylindrical aperture 7 is provided within the reflector and concentric with this arranged.
  • the diaphragm 7 is held by suitable struts 11 concentric with the reflector 2 and its optical axis 5.
  • the struts 11 extend between the reflector and the diaphragm and, as in the case shown, can be designed, for example, as radially extending struts. However, it is also possible to perform the struts parallel to the optical axis 5, in which case they are connected, so to speak, as an extension of the cylindrical aperture 7 with the lower end of the reflector at the light inlet opening 3.
  • a plano-convex converging lens 10 is arranged, the plane side with the first end 8 of the tubular aperture 7 terminates.
  • the distance of the converging lens 10 from the LED 6 and the refractive power of the converging lens 10 are dimensioned such that the LED 6 is located at the focal point of the converging lens 10.
  • the plano-convex converging lens 10 is bordered with its edge in the cylindrical tubular aperture 7.
  • the second end 9 of the tubular aperture 7 terminates for aesthetic reasons with the light exit opening 4 of the reflector 2 from.
  • the tubular diaphragm 7 protrudes beyond the light exit opening 4 of the reflector 2. This version may be desired for aesthetic reasons. Since the tubular diaphragm 7 is arranged concentrically to the reflector 2, the optical axis of the converging lens 10 coincides with the optical axis of the reflector.
  • FIG. 2 the effect of the optical system of the headlamp 1 according to the invention is illustrated.
  • the light emitted by the LED 6 is divided into an inner beam path 12. 1, 12. 2 and an outer beam path 13.
  • the beam path 12. 1 widening by the LED 6 is converted by the convergent lens 10 into a nearly parallel beam path 12.
  • On the way between the converging lens 10 and the the second end 9 and the light exit opening 4, a large part of the undesired obliquely emitted to the optical axis 5 light is absorbed on the inner wall of the tubular aperture 7.
  • the inner wall of the tubular diaphragm 7 is provided for this purpose with a light-absorbing coating.
  • the outer beam path 13 is in FIG. 2 symbolized by the rays 13.1, 13.2 and 13.3.
  • the light component of the light emitted by the LED 6, which does not enter the converging lens 10 or the tubular diaphragm 7, but at the lower first end 8 of the tubular diaphragm passes, reflected and almost parallel to the optical axis. 5 radiated.
  • the light emitted by the LED 6 can not escape directly through the light exit opening 4 of the parabolic reflector 2. All light of the outer beam path 13 is therefore reflected on the inner wall of the reflector 2.
  • the tubular diaphragm 7 is also provided on the outside with an absorbent coating.
  • the light-absorbing coating consists of a deep black matt finish both inside and out.
  • FIG. 3 shows a longitudinal section of a headlight according to the invention with additional reflector 14.
  • the headlight 1 is substantially the same structure as the headlight from the Figures 1 and 2 , wherein instead of the converging lens, an additional reflector 14 is used.
  • This is, as well as the condenser lens in the Figures 1 and 2 illustrated embodiment, arranged at the first end 8 of the tubular aperture 7, so that the light inlet opening 15 of the additional reflector 14 terminates with the first end 8 of the tubular aperture 7.
  • the additional reflector 14 is designed as a parabolic reflector, and widens along the optical axis 5, so that the light exit opening 16 of the additional reflector 14 corresponds in diameter to the diameter of the tubular aperture 7.
  • the additional reflector 14 designed as a parabolic reflector is designed in such a way that the light source 6 is at its focal point.
  • the inner beam path 12.1 is in accordance with the inventive headlight Fig. 3 in a bundled beam path 12.2, but here by reflection of the emitted light from the light source 6 on the wall of the reflector 14 illustrates the effect of the additional reflector 14 on the basis of the light beam 12.3, starting from the LED 6 obliquely impinges on the inner wall of the additional reflector 14 and is reflected there to a nearly paraxial beam.
  • the focal point of the main reflector 2 and the focal point of the additional reflector 14 coincide, namely in the location of the light source or its light center.
  • headlights according to the invention are also suitable for light sources other than the LED 6 shown.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (14)

  1. Projecteur (1), notamment du type "Downlight", comprenant un réflecteur (2) avec une ouverture d'entrée de lumière (3), une ouverture de sortie de lumière (4) et un axe optique (5), une source de lumière (6) agencée au niveau de l'entrée de lumière (3), et comprenant un diaphragme (7) de forme tubulaire, projecteur dans lequel le diaphragme (7) est agencé à l'intérieur du réflecteur (2) et de manière concentrique à l'axe optique (5), et présente une première extrémité (8) ainsi qu'une deuxième extrémité (9), et
    dans lequel la première extrémité (8) est dirigée vers l'ouverture d'entrée de lumière (3) du réflecteur (2), caractérisé en ce qu'il est par ailleurs prévu une lentille convergente (10) agencée dans le diaphragme (7), et dont l'axe optique coïncide avec l'axe optique (5) du réflecteur (2).
  2. Projecteur (1) selon la revendication 1, caractérisé en ce que la lentille convergente (10) est agencée au niveau de la première extrémité (8) du diaphragme (7).
  3. Projecteur (1) selon l'une des revendications 1 ou 2, caractérisé en ce que la lentille convergente (10) est d'une configuration convexe-plane, la face plane de la lentille convergente (10) étant dirigée vers la source de lumière (6).
  4. Projecteur (1) selon la revendication 1, caractérisé en ce que la face plane de la lentille convergente (10) arrive au ras de la première extrémité (8) du diaphragme (7).
  5. Projecteur (1) selon l'une des revendications 1 à 4, caractérisé en ce que la puissance optique de la lentille convergente (10) est dimensionnée de manière telle que la marche des rayons (12.2) de la lumière de la source de lumière (6) passant à travers le diaphragme (7), correspond quant à son étendue transversalement à l'axe optique (6), au contour intérieur du diaphragme (7).
  6. Projecteur (1) selon l'une des revendications 1 à 5, caractérisé en ce que la lentille convergente (10) est agencée à une distance de la source de lumière (6) qui correspond à la distance focale de la lentille convergente (10).
  7. Projecteur (1), notamment du type "Downlight", comprenant un réflecteur (2) avec une ouverture d'entrée de lumière (3), une ouverture de sortie de lumière (4) et un axe optique (5), une source de lumière (6) agencée au niveau de l'entrée de lumière (3), et comprenant un diaphragme (7) de forme tubulaire, projecteur dans lequel le diaphragme (7) est agencé à l'intérieur du réflecteur (2) et de manière concentrique à l'axe optique (5), et présente une première extrémité (8) ainsi qu'une deuxième extrémité (9), et
    dans lequel la première extrémité (8) est dirigée vers l'ouverture d'entrée de lumière (3) du réflecteur (2), caractérisé en ce qu'il est par ailleurs prévu un réflecteur additionnel (14) de focalisation agencé dans le diaphragme (7), et dont l'axe optique coïncide avec l'axe optique (5) du réflecteur (2).
  8. Projecteur (1) selon la revendication 7, caractérisé en ce que le réflecteur additionnel (14) est agencé au niveau de la première extrémité (8) du diaphragme (7).
  9. Projecteur selon l'une des revendications 7 ou 8, caractérisé en ce que le réflecteur additionnel (14) est réalisé sous forme de réflecteur parabolique.
  10. Projecteur selon l'une des revendications 7 à 9, caractérisé en ce que le réflecteur additionnel (14) présente un foyer, la source de lumière (6) se trouvant au niveau du foyer du réflecteur additionnel (14).
  11. Projecteur (1) selon l'une des revendications 1 à 10, caractérisé en ce que le diaphragme tubulaire (7) est de configuration cylindrique.
  12. Projecteur (1) selon l'une des revendications 1 à 11, caractérisé en ce que le diaphragme (7) est pourvu, sur son côté extérieur dirigé vers le réflecteur (2), d'un revêtement absorbant la lumière.
  13. Projecteur (1) selon l'une des revendications 1 à 12, caractérisé en ce que le diaphragme (7) est pourvu, à l'intérieur, d'un revêtement absorbant la lumière.
  14. Projecteur (1) selon l'une des revendications 1 à 13, caractérisé en ce que la source de lumière (6) est une source de lumière à LED (diode électroluminescente).
EP11003198.6A 2011-04-15 2011-04-15 Phare doté d'un angle de diffusion à demi-intensité réduit Active EP2511595B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11003198.6A EP2511595B1 (fr) 2011-04-15 2011-04-15 Phare doté d'un angle de diffusion à demi-intensité réduit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11003198.6A EP2511595B1 (fr) 2011-04-15 2011-04-15 Phare doté d'un angle de diffusion à demi-intensité réduit

Publications (2)

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EP2511595A1 EP2511595A1 (fr) 2012-10-17
EP2511595B1 true EP2511595B1 (fr) 2013-12-11

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015106256U1 (de) * 2015-11-18 2017-02-22 Zumtobel Lighting Gmbh Blendarme Lichttechnik

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6547423B2 (en) 2000-12-22 2003-04-15 Koninklijke Phillips Electronics N.V. LED collimation optics with improved performance and reduced size
JP2004259541A (ja) * 2003-02-25 2004-09-16 Cateye Co Ltd 照明器具
DE10340039B4 (de) 2003-08-28 2011-01-05 Odelo Gmbh Beleuchtungseinheit mit Lichtquelle und dieser nachgeschaltetem transparentem Lichtleitkörper
DE102004004772B4 (de) 2004-01-30 2008-09-11 Osram Opto Semiconductors Gmbh Elektromagnetische Strahlung richtendes optisches Element und elektromagnetische Strahlung emittierendes Bauelement
ATE453930T1 (de) 2004-10-14 2010-01-15 Fiat Ricerche Optikelement und modul zur projektion eines lichtbündels, und kraftfahrzeugleuchte mit einer mehrzahl solcher modulen
US7125147B2 (en) * 2004-11-18 2006-10-24 Waring Patrick S Method and apparatus for directing light from a light source
US8529102B2 (en) * 2009-04-06 2013-09-10 Cree, Inc. Reflector system for lighting device

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