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WO2011039005A1 - Feu de circulation à led - Google Patents

Feu de circulation à led Download PDF

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Publication number
WO2011039005A1
WO2011039005A1 PCT/EP2010/062415 EP2010062415W WO2011039005A1 WO 2011039005 A1 WO2011039005 A1 WO 2011039005A1 EP 2010062415 W EP2010062415 W EP 2010062415W WO 2011039005 A1 WO2011039005 A1 WO 2011039005A1
Authority
WO
WIPO (PCT)
Prior art keywords
traffic signal
leds
led traffic
led
signal according
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/EP2010/062415
Other languages
German (de)
English (en)
Inventor
Peter Brick
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.)
Ams Osram International GmbH
Original Assignee
Osram Opto Semiconductors GmbH
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 Osram Opto Semiconductors GmbH filed Critical Osram Opto Semiconductors GmbH
Publication of WO2011039005A1 publication Critical patent/WO2011039005A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes

Definitions

  • the invention relates to an LED traffic signal.
  • Traffic signals such as traffic lights require a homogeneous illumination of the signal surface, a defined bundling of the emitted radiation and a high intensity of the emitted light beam.
  • the light source and its optical elements must be designed in such a way that they fulfill legal minimum requirements with regard to the aforementioned properties.
  • LEDs which are characterized by a long service life Le ⁇ and a comparatively low power consumption.
  • LEDs are used in Radialgeophu ⁇ sen, comprise the wire leads and a reflector on ⁇ .
  • LED light sources very many discrete LEDs are needed to achieve the Necessary to traffic signals ⁇ Liche light intensity. Due to tolerances in the manufacture of the reflector and in the assembly, an undesired asymmetric radiation of the light ⁇ source may occur. Furthermore, dissipation of the heat generated in operation from the plurality of LEDs is difficult.
  • an object to be solved is to specify an LED traffic signal which is distinguished by an improved homogeneous illumination processing the signal area, a defined bundling emit ⁇ oriented radiation as well as a high radiation intensity from ⁇ distinguished.
  • This object is achieved by an LED traffic signal with the Merk ⁇ paint of claim 1.
  • Advantageous embodiments and modifications of the invention are the subject of the dependent claims.
  • the LED traffic signal comprises at least one LED light source with multiple devis perennialmonierbaren LEDs, each having a light exit ⁇ surface.
  • the LED traffic signal advantageously contains a pre-collimating unit arranged downstream of the light exit surfaces of the LEDs and a collimating unit arranged downstream of the pre-collimating unit.
  • the light exit surfaces of the LEDs subsequent Vorkolli ⁇ minimizing unit serves to reduce the divergence of the oriented emit light from the LEDs in order to achieve a homogeneous illumination of the subsequent collimation.
  • the beam shaping of the signal light emitted by the LED traffic signal takes place.
  • the number of surface-mountable LEDs of the LED light source is preferably not more than five.
  • surface-mountable LEDs are here and in particular to be understood as LEDs hereinafter which have no Drahtan ⁇ circuits for a push-through assembly, but ⁇ can be soldered directly by means of solderable pads ge on a circuit board. Such LEDs are also referred to as SMD (Surface Mounted Device) LEDs.
  • Such surface mount LEDs which are not only the electrical pads are located on the underside of the device, but also a thermal interface ⁇ surface over which the heat emitted by the LED heat can be derived.
  • the pre-collimating unit following the light exit surfaces of the LEDs in the beam direction of the light emitted by the LEDs serves to achieve the most homogeneous possible illumination of the following collimating unit.
  • the Vorkollimieriki is adapted to reduce the divergence of the light emitted by the LEDs to direct as much as possible of all the radiation emitted by the LEDs radiation to the following ⁇ collimating unit.
  • Vorkollimierillon of collimation is used for beam shaping of the emit from the LED traffic signal ⁇ formatted signal light.
  • the collimation is used in particular to adjust a predetermined radiation angle of the LED traffic signal, which may be predetermined, for example by ge ⁇ statutory provisions.
  • the LED light source comprises only a few, preferably not more than five surface-mountable LEDs.
  • the LED light source comprises only two, three or four LEDs.
  • a distance between the light exit surfaces of the LEDs ⁇ and a light exit surface of the traffic signal ⁇ not more than 1.5 times the radius of the light exit surface of the traffic signal.
  • the distance between the light exit surfaces of the LEDs and the light exit surface of the traffic signal is not more than the radius of the light exit surface of the traffic signal.
  • the light exit surface of the traffic signal has advantageous ⁇ way to a radius of 75 mm or more, preferably of 100 mm or more, or even more preferably of 150 mm or more.
  • the surface emitting LEDs of the LED light source advantageously have a luminous flux of at least 50 Im. Before Trains t ⁇ , the luminous flux of the surface-mounted LEDs 100. In at least more preferably at least 150 In. Due to the comparatively high luminous flux of the individual surface mountable LEDs, it is possible to meet the legal requirements for the intensity of a traffic signal even with a few LEDs, in particular with no more than five LEDs.
  • the precollimating unit has at least one optical concentrator.
  • the optical concentrator is preferably designed as a CPC, CEC or CHC-type optical concentrator, which here and hereinafter means a concentrator whose reflective side surfaces at least partially and / or at least ⁇ largely the shape of a composite para ⁇ bolischen concentrator (Compound Parabolic Concentrator, CPC), a composite elliptical concentrator
  • the surface facing the LEDs is the actual concentrator output, so that radiation, in comparison with the conventional use of a concentrator for focusing, runs in the opposite direction through it and thus does not concentrate, but leaves the concentrator with reduced divergence through the opposite surface.
  • the optical concentrator is a composite parabolic concentrator (CPC).
  • each of the LEDs is followed by an optical concentrator.
  • the beam of each LED can be particularly well mapped to the following after ⁇ collimation.
  • the LEDs have a common optical concentrator.
  • the LEDs may have a common lens or each of the LEDs be ⁇ vorzugt a single lens as Vorkollimie ⁇ purity.
  • Particularly suitable lenses are, in particular, TIR (Total Internal Reflection) lenses.
  • combinations of the aforementioned optical elements for example a combination of a TIR lens and a CPC-like optical concentrator, can also be used as the precollimating unit.
  • the collimating unit is preferably a Fresnel lens.
  • a per se known Fresnel lens structure is formed by a central convex lens area and annular steps surrounding the central lens area with step surfaces and step flanks.
  • At least a part of the step surfaces is provided with microlenses.
  • at least a part of the step flanks is provided with microlenses.
  • both a part of the step flanks and part of the step surfaces are provided with microlenses.
  • the step surfaces are provided with microlenses in a subregion adjoining the central lens region, in which light rays of the light source impinge on the step surfaces. Furthermore, in a further subregion, in which Light rays of the light source hit the Fresnel lens structure so flat that they do not impinge on the step surfaces, but on the step edges, the step edges provided with microlenses.
  • the Fresnel lens structure can be arranged on the surface of the collimating unit facing the light source or on the surface of the collimating unit facing away from the light source.
  • the LED traffic signal has a predetermined emission angle which in particular satisfies legal requirements.
  • Preference ⁇ example is the full width at half maximum (FWHM, full width at half maximum) of the light emitted from the traffic signal light intensity as a function of the radiation angle in the horizontal
  • the traffic signal comprises a cover window.
  • the cover window is arranged downstream of the collimating unit in the beam direction, so that a surface of the cover window facing away from the light source can form the light exit surface of the traffic signal.
  • at least one surface of the cover window has a roughening or a microlens array.
  • the collimator unit for example a Fresnel lens, out ⁇ forms one piece with the cover window, or itself acts as a cover window.
  • the side facing away from the light source surface of the collimator unit forms the light exit surface of scholarsig ⁇ Nals.
  • at least one surface of the collimating unit has a roughening, scattering particle or a microlens array.
  • the roughening, the scattering particles or the microlens array improves the homogeneity of the illuminance E at the light exit surface of the traffic signal. Under the illuminance is the luminous flux per unit area to understand.
  • FIG. 1 shows a schematic sectional view of an exemplary embodiment of the LED traffic signal
  • Figure 2 is a schematic plan view of the ⁇ is asked in Figure 1 embodiment of an LED traffic signal
  • Figure 3 is a graphical representation of the emitted light intensity of the LED traffic signal in dependence ei ⁇ nes horizontal angle x
  • Figure 4 is a graphical representation of the emitted light intensity of the LED traffic signal in dependence ei ⁇ nes vertical angle v
  • Figure 5 is a schematic representation of a cross section through the collimating unit and the cover window are respectively a schematic for a further embodiment of the LED traffic signal
  • FIG. 16 is a schematic representation of a cross section through the collimating unit and the cover window, in a further embodiment of the LED traffic signal.
  • Identical or equivalent elements are provided in the figures with the same reference numerals.
  • the sizes of the components and the proportions of the ingredients underein ⁇ the other should not be regarded as true to scale.
  • the exemplary embodiment of an LED traffic signal shown in FIG. 1 in a sectional view and that shown in FIG. 2 in a plan view contains a light source 10, which is formed from three LEDs 1.
  • the LEDs 1 are advantageously ⁇ surface mountable LEDs, which are also referred to as SMD LEDs.
  • the surface-mountable LEDs 1 advantageously have an LED housing with connecting surfaces on the underside or on the housing protruding connecting strips, so that the LEDs 1 on the terminal contact surfaces or - Lü ⁇ the connection strip with a circuit board (not illustrated ⁇ provides) can be electrically connected.
  • the surface-mountable LEDs 1 can be soldered to the printed conductors of a printed circuit board.
  • the LEDs 1 have light exit surfaces 2, which preferably lie in a common plane.
  • the light exit surfaces 2 of the LEDs 1 are arranged downstream of a Vorkollimierillon 3 in the beam direction.
  • the precollimating unit 3 is formed by three optical concentrators 4, wherein the optical concentrators 4 are preferably compound parabolic concentrators (CPCs - Compound Parabolic Concentrator).
  • the precollimating unit 3 serves to shape the light beams emitted by the LEDs 1 such that a collimating unit 5 is illuminated as uniformly as possible.
  • the collimating unit 5 follows the precollimating unit in FIG.
  • the light exit surface 7 of the LED traffic signal is formed in the embodiment by the side facing away from the light source 10 surface of a cover 6, the collimating unit 5 in
  • the collimating unit 5 is formed by a Fresnel lens.
  • the collimating unit 5 is used for beam shaping of the light bundle 11 emitted by the light source 10.
  • the beam shaping takes place in such a way that the light intensity emitted by the LED traffic signal has a full angle angle. value width of at least 28 °.
  • the light intensity is thus in an angular range of +/- 14 ° to a main beam direction at least half as large as their maximum.
  • the surface-mountable LEDs 1 preferably each have a luminous flux of at least 50 ⁇ m, preferably of at least 100 ⁇ m and particularly preferably of at least 150 ⁇ m.
  • the LEDs of the light source 1 are preferably the same ⁇ color LEDs, for example, have one of the three colors red, yellow or green of a traffic light.
  • the light ⁇ source 10 contains less than five LEDs, such as. B. three LEDs 1 in the embodiment shown in Figure 1.
  • a very small overall depth of the optical system used for beam shaping of the LEDs 1 can be achieved.
  • a distance t of the LEDs 1 and the light exit surface 7 of the periodic signal Ver ⁇ surfaces no longer 2 between the light exit than 1.5 times the radius r of the light exit surface 7 of the traffic signal.
  • the distance t between the light exit surfaces of the LEDs 1 and 2 of the light exit surface 7 of the traffic signal is not more than the radius r of the light exit surface 7 of the LED traffic signal.
  • one of the surfaces of the cover 6 or the collimating unit 5 is provided with a roughening or a micro lens array.
  • the surface 8 of the cover window 6 facing the LED light sources 1 may be provided with a roughening (not shown).
  • the homogeneity of the light beam emitted by the LED traffic signal is improved.
  • such a good homogeneity of the light emission can be achieved on the light exit surface 7 that the minimum illuminance E m i n applies to the maximum illumination level E max and the light from ⁇ exit surface 7 of the LED traffic signal:
  • the emitted light intensity I v is graphically represented as a function of a horizontal angle x and a vertical angle y .
  • the full half width of the curves is more than 28 ° in each case.
  • the light intensity at the maximum of the two curves is more than 480 cd in each case.
  • the descriptions herein ⁇ ne LED traffic signal is therefore particularly suitable to meet the legal requirements for traffic signals.
  • Fig. 5 shows a schematic representation of a cross section through an embodiment of the collimating unit 5 and the cover window 6 in one embodiment of the LED traffic signal.
  • the collimating unit 5 has a Fresnel lens structure 13.
  • the Fresnel lens structure 13 includes a central convex lens portion 14 and annular Fresnel stages having step surfaces 15 and step edges 16.
  • the Fresnel lens structure 13 advantageously has three zones, which differ in their optical function from each other.
  • Centrally incident light beams IIa strike the central lens area 14 of the Fresnel lens structure.
  • the central lens region 14 can be embodied as a spherical or aspherical lens.
  • Fig. 6 shows the upper portion of the collimating unit 5 and the cover window 6 in an embodiment of the LED traffic signal.
  • the collimating unit 5, as in the embodiment of FIG. 5, has a Fresnel lens structure 13. At least one or even all of the surfaces of packages ⁇ minimizing unit 5 are provided with scattering particles. 9 Furthermore, the light source facing surface 8 of the Ab ⁇ deck window 6 is provided with scattering particles 9.
  • the light output tread surface 7 of the cover window 6, which limits the LED traffic signal to the outside, is advantageously not provided with scattering particles, but preferably has a smooth surface. In this way, contamination of the light exit surface 7 is prevented.
  • the scattering particles 9 may contain, for example, glass, S1O 2 or T1O 2 . Through the scattering particles 9 a fürmi ⁇ tion of the light emitted by the LEDs 11 is achieved.
  • the at least one surface can also be provided with a roughening.
  • the roughness of the surface preferably has a Peak-to-Valley value between 10 nm and 10 ym in the case ⁇ sem.
  • the scattering particles 9 can also, as shown in FIG. 7, be introduced into the volume of the collimating unit 5 and / or the cover window 6.
  • the surface of the collimating unit 5 facing the light source has a Fresnel lens structure 13.
  • the surface of the collimating line 5 facing away from the light source is provided with microlenses 12.
  • the surface of the cover window facing the light source 6 also has microlenses 12.
  • the Fresnel lens structure 13 is formed in contrast to the embodiment of Figure 7 on the side facing away from the light source surface of the collimating unit 5.
  • the surface facing the light source has microlenses 12.
  • the microlenses 12 of the exemplary embodiments according to FIGS. 8 and 9 are used to beamform the light 11 emitted by the LED traffic signal.
  • the microlenses 12 are preferably aspherical lenses in order to achieve a desired beam profile.
  • the microlenses 12 may in particular comprise biconical lenses, ie lenses which have different radii of curvature in the horizontal and vertical directions. For example, in an LED traffic signal in ho ⁇ rizontaler towards a greater beam divergence than in comparable tikaler direction may be desirable. This can be realized by means of aspherical microlenses 12.
  • the collimating unit 5 is a Fresnel lens in which the Fresnel lens structure 13 is disposed on the surface facing the light source.
  • the Fresnel lens structure 13 has annular steps with step surfaces 15 and step flanks 16.
  • the step surfaces 15 or at least a part of the step surfaces 15 are advantageously provided with microlenses 12.
  • the collimating unit 5 also has a Fresnel lens structure 13, whose step surfaces 15 are provided with microlenses 12.
  • the Fresnel lens structure 13 is, however, arranged on the surface of the collimating unit 5 facing away from the light source.
  • the Fresnel lens structure 13 is arranged on the surface of the collimating unit 5 facing the light source, as in the exemplary embodiment illustrated in FIG.
  • This version differs from the exemplary embodiment of FIG. 10 in that not the step surfaces 15 but the step flanks 16 are provided with microlenses 12.
  • the microlenses 12 are applied in the regions of the Fresnel lens structure on the step edges 16, in which the angle of incidence of the light 11 is so large that the incident light 11 does not impinge on the Wegnober ⁇ surfaces 15, but on the stepped edges 16. This is the case in particular in the edge region of the Fresnel lens structure 13.
  • the collimating unit 5 and the cover window 6 are formed in one piece, as shown in FIGS. 13 to 15.
  • the purity Kollimie- 5 in the embodiment of FIG. 13 is a light source facing the Fresnel lens structure 13 and is fixedly connected at the side facing away from the light source surface with the Ab ⁇ deck window 6.
  • the Fresnel lens structure 13 may also be provided in the one-piece embodiment of the collimation and Abdeck donorss 6 having microlenses 12th
  • the conversnoberflä ⁇ surfaces 15 of the Fresnel lens structure 13 and in the embodiment of FIG. 14, the step flanks 16 with Mikrolin- sen 12 is provided.
  • FIG. 16 shows a particularly advantageous embodiment of the collimating unit 5.
  • the collimating unit 5 is constructed substantially like the collimating unit of FIG. In particular, it has a Fresnel lens structure 13 facing the light source. In a subregion adjoining the central lens region 14, in which light rays IIb impinge on the step surfaces 15, the step elements Surface 15 of the Fresnel lens structure 13 is provided with microlenses 12. In a further outer subarea, light beams 11 c strike the Fresnel lens structure 13 in such a flat manner that they do not impinge on the step surfaces 15 but on the stepped flanks 16. In this area of the Fresnel lens structure, the step flanks 16 are provided with microlenses 12.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Traffic Control Systems (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un feu de circulation à LED comprenant au moins une source lumineuse à LED (10) constituée de plusieurs LED (1) pouvant être montées en surface. Une unité de pré-collimation (3) est placée en aval des surfaces de sortie de lumière (2) des LED (1). Le feu de circulation à LED comprend également une unité de collimation (5) installée en aval de l'unité de pré-collimation (3). Le nombre de LED (1) montables en surface de la source lumineuse à LED (10) n'est pas supérieur à cinq.
PCT/EP2010/062415 2009-09-30 2010-08-25 Feu de circulation à led Ceased WO2011039005A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009047882.5 2009-09-30
DE102009047882A DE102009047882A1 (de) 2009-09-30 2009-09-30 LED-Verkehrssignal

Publications (1)

Publication Number Publication Date
WO2011039005A1 true WO2011039005A1 (fr) 2011-04-07

Family

ID=42768090

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/062415 Ceased WO2011039005A1 (fr) 2009-09-30 2010-08-25 Feu de circulation à led

Country Status (2)

Country Link
DE (1) DE102009047882A1 (fr)
WO (1) WO2011039005A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9599763B2 (en) 2012-09-14 2017-03-21 Thales Deutschland Gmbh Universal traffic light luminaire

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013202334B4 (de) * 2013-02-13 2016-11-10 Osram Gmbh Beleuchtungsvorrichtung zum Bereitstellen von Licht
DE102014205458A1 (de) * 2014-03-24 2015-09-24 Siemens Aktiengesellschaft Signalgeber zur Abgabe eines Lichtsignals

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EP0523927A2 (fr) * 1991-07-17 1993-01-20 Precision Solar Controls Inc Lampe à diodes électroluminescentes avec lentille
EP0905439A2 (fr) * 1997-09-24 1999-03-31 SWARCO FUTURIT Verkehrssignalsysteme Ges.m.b.H. Indicateur optique de signaux à sources lumineuses multiples
US6005722A (en) * 1998-09-04 1999-12-21 Hewlett-Packard Company Optical display system including a light valve
WO2001009859A1 (fr) * 1999-07-29 2001-02-08 Cooper Technologies Company Feux de circulation a diodes electroluminescentes pourvus de reflecteurs a del individuels
WO2002084749A2 (fr) 2001-04-10 2002-10-24 Osram Opto Semiconductors Gmbh Cadre conducteur et boitier pour un element emettant un rayonnement, element emettant un rayonnement ainsi que procede de fabrication dudit element
EP1541920A1 (fr) * 2003-12-10 2005-06-15 Sagem SA Feu de signalisation à diodes electroluminescentes

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EP1110027A1 (fr) * 1999-07-02 2001-06-27 Lumileds Lighting B.V. Eclairage et feux de signalisation
DE10022713B4 (de) * 2000-05-10 2004-02-05 Osram Opto Semiconductors Gmbh Signalgeber für Verkehrssignale
US6616299B2 (en) * 2001-02-02 2003-09-09 Gelcore Llc Single optical element LED signal
US7021807B2 (en) * 2003-02-25 2006-04-04 Tong Fatt Chew Signal lamp incorporating spatially separated clustered light emitting devices
US7237924B2 (en) * 2003-06-13 2007-07-03 Lumination Llc LED signal lamp
ITTO20030853A1 (it) * 2003-10-30 2005-05-01 Ct Ricerche Plast Optica S R L Dispositivo luminoso, in particolare pannello luminoso per segnaletica o informazione al pubblico, o fanale di autoveicolo.
US7490954B2 (en) * 2004-07-30 2009-02-17 Lumination Llc LED traffic signal
US7810963B2 (en) * 2006-03-10 2010-10-12 Dialight Corporation Light emitting diode module with improved light distribution uniformity
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523927A2 (fr) * 1991-07-17 1993-01-20 Precision Solar Controls Inc Lampe à diodes électroluminescentes avec lentille
EP0905439A2 (fr) * 1997-09-24 1999-03-31 SWARCO FUTURIT Verkehrssignalsysteme Ges.m.b.H. Indicateur optique de signaux à sources lumineuses multiples
US6005722A (en) * 1998-09-04 1999-12-21 Hewlett-Packard Company Optical display system including a light valve
WO2001009859A1 (fr) * 1999-07-29 2001-02-08 Cooper Technologies Company Feux de circulation a diodes electroluminescentes pourvus de reflecteurs a del individuels
WO2002084749A2 (fr) 2001-04-10 2002-10-24 Osram Opto Semiconductors Gmbh Cadre conducteur et boitier pour un element emettant un rayonnement, element emettant un rayonnement ainsi que procede de fabrication dudit element
EP1541920A1 (fr) * 2003-12-10 2005-06-15 Sagem SA Feu de signalisation à diodes electroluminescentes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9599763B2 (en) 2012-09-14 2017-03-21 Thales Deutschland Gmbh Universal traffic light luminaire

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