EP2924345B1 - Lighting devices with asymmetrical light distribution - Google Patents
Lighting devices with asymmetrical light distribution Download PDFInfo
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- EP2924345B1 EP2924345B1 EP14162432.0A EP14162432A EP2924345B1 EP 2924345 B1 EP2924345 B1 EP 2924345B1 EP 14162432 A EP14162432 A EP 14162432A EP 2924345 B1 EP2924345 B1 EP 2924345B1
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- Prior art keywords
- lens
- light
- optical system
- lens plate
- led
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Classifications
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- 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
- F21V5/00—Refractors for light sources
- F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
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- 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
- F21V13/02—Combinations of only two kinds of elements
- F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
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- 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
- F21V5/00—Refractors for light sources
- F21V5/08—Refractors for light sources producing an asymmetric light distribution
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- 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
- F21Y2105/00—Planar light sources
- F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
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- 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 invention relates to a lens plate optics for LED lights with asymmetric light distribution according to the preamble of claim 1 and the WO 2013 / 152199A1 ,
- This document shows a deflection of the light emitted to the rear by means of an optically effective rib, which is located within the optics and deflects light falling thereon by means of total reflection in a more favorable angular range.
- the geometric boundary conditions in particular a shared lens outer surface, however, only allow the utilization of a small portion of the light emitted to the rear, because many light rays are outside the total reflection angle or missing this area altogether, or are directed to irrelevant areas and in this way many light distribution wishes can not be operated efficiently.
- the CN 103471033A describes in particular with reference to FIG. 25, the beam path of such optics, which reflects the rear light on the road side with a totally reflecting surface. It is also shown here, that light is still lost to the rear. Also the US 2014 / 0085905A1 (Broughton) shows a similar operation, in Fig. 28, the light loss can be seen to the rear.
- the object of the invention is to design a suitable optics, which deflects the entire against the mast or house walls (the back) directed and thus far lost and disturbing part of the LED light so far that this light is fully usable for the desired light distribution is and even in multiple arrangement in a lens plate allows a simple, inexpensive production of transparent plastic.
- LEDs Light-emitting diodes, or LEDs for short, have established themselves as efficient light sources in lighting technology. Although they have different designs and light qualities, but differ in their lighting properties but relatively little of each other. Most LEDs are so-called cosine emitters, because they represent optimum light output and efficiency with low production costs and small size. The light output per LED is different depending on the inner structure and size of the semiconductor, but the LED sizes differ externally only slightly. Therefore, you can Optics are developed, which are suitable in their essential parameters for a variety of marketed LED types or easily adaptable. Depending on the lighting design task, however, the optics are subject to very different demands on the light distribution to be generated.
- a light source in the form of a horizontal, planar printed circuit board offers, on which the LEDs are arranged at more or less regular intervals from one another and emit their light downwards.
- the light is distributed as desired by lenses placed in front of the LEDs, which are integrated in a common plate of transparent material, a so-called lens plate, which at the same time forms the protection against moisture and weather.
- CN 201764411 U or CN 101699148 A show such optics, which distribute the light especially in the street longitudinal direction, the oblique radiation is generated by a corresponding oblique cavity for the LED, but for a sufficiently oblique illumination in addition the lamp itself must be addressed as in CN 102102851A what is no longer wanted in Europe for reasons of glare and light pollution.
- the object of the invention is to design a suitable optics, which deflects the entire directed against the mast or house walls and thus previously lost and disturbing part of the LED light to the extent that this light is fully usable for the desired light distribution and also in multiple arrangement in a lens plate a simple, inexpensive production made of transparent plastic allowed. This is achieved by the features specified in the characterizing part of claim 1 features.
- Fig. 1 shows the basic structure of a single optic 10.
- the semiconductor 3 represents the actual light source.
- an LED lens is set over it for protection, medium power LEDs have a recess in which the semiconductor is located and potted.
- a hemispherical light emission is produced with an outwardly zero intensity, commonly known as Lambertian or cosine distribution.
- the LED is surrounded by a cavity of the optics, which is subdivided by a lens bar 4 into a main cavity 5, which accommodates the LED 2, and a secondary cavity 6.
- the lens land 4 has on the side of the main cavity 5 acting as a convex converging lens 4 a optical surface, the side of the secondary cavity 6 is here a flat surface 4 b, but could also be arbitrarily curved.
- the main cavity 5 is limited on the one hand by the converging lens 4a, on the other hand by a differently curved free-form surface 5a, which contributes particularly effective by partial scattering and collecting the light to form the desired light distribution.
- the subsequent surface 5b has no optical tasks, it only includes the Hauptkavtician 5 to the circuit board 1 down.
- the Superkavtician 6 is formed on the one hand by the surface 4b of the lens land, on the other hand by a mostly light scattering acting concave lens surface 6a.
- the adjoining surface 6b has no visual concern, it only closes off the secondary cavity 6 to the printed circuit board 1 from.
- the outside of the optic 10 consists of a lens cap 7 with variable curvature, which extends substantially over the cavity of the optics.
- a mostly crooked appearing light steering rib 8 which usually something protrudes into the lens cap 7, but could also be deducted entirely from it. It extends over the Maukavtician 6 and protrudes clearly beyond them.
- the light-guiding rib 8 consists of a convex lens surface 8a on the side of the lens barrel 7 and a freeform reflection surface 8b, mainly for total reflection, on the other side.
- the optic 10 adjoins on all sides a lens plate 9 of generally constant thickness, in which it is integrated.
- the semiconductor 3 of the LED 2 radiates hemispherical light 11, which falls either on the free-form surface 5a or on the converging lens 4a of the lens bar 4.
- the incident on the free-form surface 5a light 11a is wholly directed to the lens cap 7, from where it radiates into the room. Its intensity and direction is determined by the interaction of the free-form surface 5a and the lens cap 7.
- the incident on the converging lens 4a of the lens web 4 light 11b exits through the surface 4b of the lens land, where it was mainly focused vertically and parallel, so that it completely meets the concave lens surface 6a. There it is deflected and scattered so that it is completely totally reflected during the subsequent impact on the reflection surface 8b and emerges at the lens surface 8a of the light guide rib.
- the light undergoes 11b mostly a considerable deflection of mostly over 90 ° to almost 180 °, the four lens surfaces 4a, 4b, 6a and 8a and the reflection surface 8b additionally provide for a favorable distribution result.
- each ray of light is usefully guided through the optics and directed into the desired distribution area, towards the mast or house facade, almost no light is emitted, which also results in a very efficient solution. It is obvious, that the precise coordination of the two light paths and thereby achieved light distributions to each other, the possibilities of light control within this optics and the design variables of the free-form surfaces are only to be determined in a simulatory way. Likewise, it is clear that an optical system according to the invention can achieve very different light distributions if some geometries are changed only slightly, while retaining the functional principle.
- Fig. 2 shows the presented optics in an illustrative representation, right from front or outside, left from behind or the PCB side.
- Fig. 3 shows the light distribution obtained by photometric simulation of the illustrated optical geometry in two common representations.
- the upper graph is a common polar cross-section through the cone of light along and across the street, the lower graph shows the total light distribution in an Isocandela diagram.
- Fig. 4 shows a section through a lens plate 9 with optics 10 according to the invention.
- the smallest possible distance of adjacent optics is determined by the mutual shading, which is also safest also identifiable by simulation. It depends on the light distribution, the exact beam path and the position of the neighboring optics. Both optics must be checked for mutual shading.
- limit light beams 11c determine the minimum distance of the optics in the direction shown.
- the presented optics has no undercuts and is perfectly demoldable both by the outer mold 12a and the inner mold 12b.
- the tool costs remain low.
- the wall thickness differences are limited, so that the lens surfaces can also be formed sufficiently precise, even with large lens plates.
- different optics can be provided in a lens plate to achieve about a light distribution by mixing existing optical geometries.
- the light distribution also changes.
- adjustments to different road widths or mast conditions are possible without having to make changes to the optical geometry of the lens plate and thus the injection mold.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Led Device Packages (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Description
Die Erfindung betrifft eine Linsenplatten-Optik für LED-Leuchten mit asymmetrischer Lichtverteilung entsprechend dem Oberbegriff des Anspruches 1 und der
Diese Druckschrift zeigt eine Umlenkung des nach hinten abgestrahlten Lichts mittels einer optisch wirksamen Rippe, welche sich innerhalb der Optik befindet und darauf fallendes Licht mittels Totalreflexion in einen günstigeren Winkelbereich umlenkt. Die geometrischen Randbedingungen, insbesonders einer gemeinsam genutzten Linsen-Außenfläche gestatten allerdings nur die Nutzbarmachung eines geringen Anteils des nach hinten abgestrahlten Lichts, weil viele Lichtstrahlen außerhalb der Totalreflexionswinkel liegen oder diese Fläche überhaupt verfehlen, oder in irrelevante Bereiche gelenkt werden und auf diese Weise viele Lichtverteilungswünsche nicht effizient bedient werden können.This document shows a deflection of the light emitted to the rear by means of an optically effective rib, which is located within the optics and deflects light falling thereon by means of total reflection in a more favorable angular range. The geometric boundary conditions, in particular a shared lens outer surface, however, only allow the utilization of a small portion of the light emitted to the rear, because many light rays are outside the total reflection angle or missing this area altogether, or are directed to irrelevant areas and in this way many light distribution wishes can not be operated efficiently.
Große Lichtablenkungen benötigen eine Optik aus mehreren Linsen oder eine Totalreflexion zur Lichtumlenkung. Die
Die Aufgabe der Erfindung besteht darin, eine geeignete Optik zu gestalten, welche den gesamten gegen den Mast oder Hauswände (die Rückseite) gerichteten und damit bisher verlorenen und störenden Teil des LED-Lichts soweit umlenkt, dass dieses Licht zur Gänze für die gewünschte Lichtverteilung nutzbar wird und auch in vielfacher Anordnung in einer Linsenplatte eine einfache, kostengünstige Herstellung aus transparentem Kunststoff erlaubt.The object of the invention is to design a suitable optics, which deflects the entire against the mast or house walls (the back) directed and thus far lost and disturbing part of the LED light so far that this light is fully usable for the desired light distribution is and even in multiple arrangement in a lens plate allows a simple, inexpensive production of transparent plastic.
Allgemein kann gesagt werden: Leuchtdioden, kurz LEDs, haben sich in der Beleuchtungstechnik als effiziente Lichtquellen durchgesetzt. Sie weisen zwar verschiedene Bauformen und Lichtqualitäten auf, unterscheiden sich in ihren lichttechnischen Eigenschaften aber relativ wenig voneinander. Die meisten LEDs sind sogenannte Cosinus-Strahler, weil diese ein Optimum an Lichtleistung und Effizienz bei geringem Herstellungsaufwand und geringer Baugröße darstellen. Die Lichtleistung pro LED ist unterschiedlich je nach innerem Aufbau und Größe des Halbleiters, trotzdem unterscheiden sich die LED-Größen äußerlich nur wenig. Daher können Optiken entwickelt werden, welche in ihren wesentlichen Parametern für eine Vielzahl von auf dem Markt befindlichen LED-Typen geeignet oder leicht adaptierbar sind. An die Optiken werden jedoch je nach Lichtplanungsaufgabe stark unterschiedliche Anforderungen an die zu erzeugende Lichtverteilung gestellt.In general it can be said: Light-emitting diodes, or LEDs for short, have established themselves as efficient light sources in lighting technology. Although they have different designs and light qualities, but differ in their lighting properties but relatively little of each other. Most LEDs are so-called cosine emitters, because they represent optimum light output and efficiency with low production costs and small size. The light output per LED is different depending on the inner structure and size of the semiconductor, but the LED sizes differ externally only slightly. Therefore, you can Optics are developed, which are suitable in their essential parameters for a variety of marketed LED types or easily adaptable. Depending on the lighting design task, however, the optics are subject to very different demands on the light distribution to be generated.
Hier ist nun eine Optik betroffen, welche insbesonders in Straßenleuchten Verwendung findet. Diese Leuchten sind hauptsächlich am Straßenrand, Gehsteigbereich oder zwischen den Fahrbahnen auf geraden Masten ohne Ausleger angeordnet, auch um sie ohne Beeinträchtigung des Verkehrs warten zu können. Das bedingt jedoch eine schräge Lichtabstrahlung, um auch die gegenüberliegende Straßenseite oder eine breitere Straße ausleuchten zu können. Zusätzlich werden Anforderungen an Blendung und Lichtverschmutzung gestellt, weshalb ein einfaches Aufneigen der Leuchten für eine breitere Ausleuchtung heutzutage nicht mehr erwünscht ist. Ein nach hinten in Richtung Mast oder Hauswand abstrahlendes Licht ist dabei zu verhindern oder abzuschatten, um die Anrainer nicht zu stören. Die Summe dieser Anforderungen erfordert daher Leuchtensysteme, deren Lichtaustrittsfläche waagrecht angeordnet ist, wobei das Licht im Wesentlichen schräg weg vom Mast abstrahlen muss.Here is an optics affected, which is used especially in street lights. These lights are mainly on the roadside, sidewalk area or between the lanes on straight masts without boom, even to be able to wait without affecting the traffic. However, this requires an oblique light emission to illuminate the opposite side of the road or a wider street. In addition, requirements for glare and light pollution are made, which is why a simple tilting the lights for a wider illumination nowadays is no longer desirable. A light radiating to the rear in the direction of the mast or house wall is to be prevented or shaded in order not to disturb the neighbors. The sum of these requirements therefore requires lighting systems whose light exit surface is arranged horizontally, with the light having to emit substantially obliquely away from the mast.
Für eine solche Leuchte bietet sich eine Lichtquelle in Form einer waagrechten, ebenen Leiterplatte an, auf welcher die LEDs in mehr oder weniger regelmäßigen Abständen zueinander angeordnet sind und ihr Licht nach unten abstrahlen. Das Licht wird durch vor die LEDs gesetzte Linsen wunschgemäß verteilt, welche in einer gemeinsamen Platte aus transparentem Material, einer sogenannten Linsenplatte integriert sind, die gleichzeitig auch den Schutz vor Feuchtigkeit und Witterung bildet.For such a luminaire, a light source in the form of a horizontal, planar printed circuit board offers, on which the LEDs are arranged at more or less regular intervals from one another and emit their light downwards. The light is distributed as desired by lenses placed in front of the LEDs, which are integrated in a common plate of transparent material, a so-called lens plate, which at the same time forms the protection against moisture and weather.
Die technische Herausforderung besteht nun darin, eine Optik für diese LEDs zu entwickeln, welche die halbkugelförmige Lichtabstrahlung der LED vollständig erfasst und genau in die benötigte Lichtverteilung umlenkt. Je besser das gelingt, umso effizienter ist die Leuchte und damit kostengünstiger im Energieverbrauch. Eine solche Optik soll darüber hinaus auch so einfach zu fertigen sein, dass sie in dutzendfacher oder gar hundertfacher Anordnung in einer solchen gemeinsamen Linsenplatte durch Spritzgießen von transparentem Kunststoff wie Plexiglas oder Polykarbonat herstellbar ist, wobei auf möglichst gleichmäßige Wandstärke mit nur geringen Masse-Anhäufungen bei den Optiken und einfache Entformbarkeit geachtet werden muss.The technical challenge now is to develop an optic for these LEDs, which completely captures the hemispherical light emission of the LED and redirects it exactly into the required light distribution. The better this succeeds, the more efficient the luminaire is and thus less expensive in terms of energy consumption. Such an appearance should also be so easy to manufacture that it can be produced in a doubled or even hundredfold arrangement in such a common lens plate by injection molding of transparent plastic such as Plexiglas or polycarbonate, with as uniform wall thickness with only small mass accumulations at the optics and easy demolding must be respected.
Bisher bekannte Optiken erfüllen diese Anforderungen nur ungenügend. Eine einfache Linsengeometrie ist nicht in der Lage, Licht so weit umzulenken wie wünschenswert. Es wird daher ein relativ großer Lichtverlust in Kauf genommen.Previously known optics meet these requirements only insufficient. A simple lens geometry is unable to redirect light as much as desirable. It is therefore a relatively large loss of light accepted.
Die chinesischen Anmeldungen
Andere Hersteller arbeiten mit teilweise sehr komplizierten Einzeloptiken, welche über die LED gesetzt werden und durch Verdrehen und Mischen die Lichtverteilung einer Leuchte verändern können.Other manufacturers work with sometimes very complicated individual optics, which are set via the LED and can change the light distribution of a luminaire by twisting and mixing.
Größere Lichtablenkungen benötigen eine Optik aus mehreren Linsen oder eine Totalreflexion zur Lichtumlenkung. Die bereits erwähnte
Die Aufgabe der Erfindung besteht darin, eine geeignete Optik zu gestalten, welche den gesamten gegen den Mast oder Hauswände gerichteten und damit bisher verlorenen und störenden Teil des LED-Lichts soweit umlenkt, dass dieses Licht zur Gänze für die gewünschte Lichtverteilung nutzbar wird und auch in vielfacher Anordnung in einer Linsenplatte eine einfache, kostengünstige Herstellung aus transparentem Kunststoff erlaubt. Das wird erfindungsgemäß durch die im kennzeichnenden Teil des Anspruches 1 angegebenen Merkmale gelöst.The object of the invention is to design a suitable optics, which deflects the entire directed against the mast or house walls and thus previously lost and disturbing part of the LED light to the extent that this light is fully usable for the desired light distribution and also in multiple arrangement in a lens plate a simple, inexpensive production made of transparent plastic allowed. This is achieved by the features specified in the characterizing part of
Die Erfindung wird nun anhand von Zeichnungen erläutert. Es zeigt
- die
Fig.1 die erfindungsgemäße Optik in Grund-, Auf- und Seitenriss samt Lichtstrahlen in Form einer Draht-Darstellung, - die
Fig. 2 die erfindungsgemäße Optik von vorne und hinten in axionometrischer Ansicht, - die
Fig. 3 die simulierte Lichtverteilung in zwei üblichen grafischen Darstellungen und - die
Fig. 4 einen Schnitt durch eine erfindungsgemäße Linsenplatte samt Leiterplatte und Formplattendetails des Spritzgusswerkzeugs.
- the
Fig.1 the optical system according to the invention in basic, top and side cracks together with light beams in the form of a wire representation, - the
Fig. 2 the optics according to the invention from the front and the rear in axionometric view, - the
Fig. 3 the simulated light distribution in two common graphs and - the
Fig. 4 a section through a lens plate according to the invention, including the circuit board and form plate details of the injection molding tool.
Die LED ist von einem Hohlraum der Optik umgeben, welcher durch einen Linsensteg 4 in eine Hauptkavität 5, welche die LED 2 aufnimmt, und eine Nebenkavität 6 unterteilt wird. Der Linsensteg 4 weist auf der Seite der Hauptkavität 5 eine als konvexe Sammellinse 4a wirkende optische Fläche auf, die Seite der Nebenkavität 6 ist hier eine ebene Fläche 4b, könnte aber auch beliebig gekrümmt sein. Die Hauptkavität 5 ist einerseits durch die Sammellinse 4a, andererseits durch eine unterschiedlich gekrümmte Freiformfläche 5a begrenzt, welche besonders wirksam durch partielles Streuen und Sammeln des Lichts zur Bildung der gewünschten Lichtverteilung beiträgt. Die anschließende Fläche 5b hat keine optischen Aufgaben, sie schließt lediglich die Hauptkavität 5 zur Leiterplatte 1 hin ab. Die Nebenkavität 6 ist einerseits durch die Fläche 4b des Linsensteges, andererseits durch eine zumeist lichtstreuend wirkende konkave Linsenfläche 6a gebildet. Die daran angrenzende Fläche 6b hat keinen optischen Belang, sie schließt lediglich die Nebenkavität 6 zur Leiterplatte 1 hin ab.The LED is surrounded by a cavity of the optics, which is subdivided by a
Die Außenseite der Optik 10 besteht aus einer Linsenkuppe 7 mit veränderlicher Krümmung, welche sich im Wesentlichen über den Hohlraum der Optik erstreckt. Unmittelbar daran anschließend befindet sich eine zumeist krumm erscheinende Lichtlenkungsrippe 8, welche meist etwas in die Linsenkuppe 7 hineinragt, aber auch gänzlich davon abgesetzt sein könnte. Sie erstreckt sich über der Nebenkavität 6 und ragt deutlich über sie hinaus. Die Lichtlenkungsrippe 8 besteht aus einer konvexen Linsenfläche 8a auf der Seite der Linsenkuppe 7 und einer hauptsächlich für Totalreflexion zuständigen Freiform-Reflexionsfläche 8b auf der anderen Seite.The outside of the optic 10 consists of a
Die Optik 10 grenzt allseitig an eine Linsenplatte 9 mit im Allgemeinen konstanter Dicke, in welcher sie integriert ist.The optic 10 adjoins on all sides a
Der Halbleiter 3 der LED 2 strahlt halbkugelförmig Licht 11 aus, welches entweder auf die Freiformfläche 5a oder auf die Sammellinse 4a des Linsensteges 4 fällt. Das auf die Freiformfläche 5a einfallende Licht 11a wird zur Gänze auf die Linsenkuppe 7 gelenkt, von wo es in den Raum abstrahlt. Seine Intensität und Richtung wird durch das Zusammenspiel der Freiformfläche 5a und der Linsenkuppe 7 bestimmt.The
Das auf die Sammellinse 4a des Linsensteges 4 einfallende Licht 11b tritt durch die Fläche 4b aus dem Linsensteg aus, wobei es vor allem vertikal gebündelt und parallel gerichtet wurde, sodass es zur Gänze auf die konkave Linsenfläche 6a trifft. Dort wird es so abgelenkt und gestreut, dass es beim nachfolgenden Auftreffen auf die Reflexionsfläche 8b vollständig total reflektiert wird und bei der Linsenfläche 8a der Lichtlenkungsrippe austritt. So erfährt das Licht 11b großteils eine erhebliche Umlenkung von meist über 90° bis nahezu 180°, wobei die vier Linsenflächen 4a, 4b, 6a und 8a und die Reflexionsfläche 8b zusätzlich noch für ein günstiges Verteilungsergebnis sorgen.The incident on the converging
Wie man sieht, wird jeder Lichtstrahl nutzbringend durch die Optik geleitet und in den gewünschten Verteilungsbereich gelenkt, Richtung Mast oder Hausfassade wird nahezu kein Licht abgestrahlt, was insgesamt auch eine sehr effiziente Lösung ergibt. Es ist offensichtlich, dass die genaue Abstimmung der beiden Lichtpfade und dabei erzielten Lichtverteilungen zueinander, die Möglichkeiten der Lichtlenkung innerhalb dieser Optik und die Gestaltungsvariablen der Freiform-Oberflächen nur mehr auf simulatorischem Weg zu ermitteln sind. Ebenso ist einsichtig, dass eine erfindungsgemäße Optik stark unterschiedliche Lichtverteilungen erzielen kann, wenn manche Geometrien nur ein wenig verändert werden, unter Beibehaltung des Funktionsprinzips.As you can see, each ray of light is usefully guided through the optics and directed into the desired distribution area, towards the mast or house facade, almost no light is emitted, which also results in a very efficient solution. It is obvious, that the precise coordination of the two light paths and thereby achieved light distributions to each other, the possibilities of light control within this optics and the design variables of the free-form surfaces are only to be determined in a simulatory way. Likewise, it is clear that an optical system according to the invention can achieve very different light distributions if some geometries are changed only slightly, while retaining the functional principle.
Weiters ist hier zu erkennen, dass die vorgestellte Optik keine Hinterschneidungen aufweist und sowohl durch die Außenform 12a wie auch die Innenform 12b einwandfrei entformbar ist. Hierdurch bleiben die Werkzeugkosten gering. Ebenso halten sich die Wandstärke-Unterschiede in Grenzen, sodass die Linsenoberflächen auch hinreichend präzise ausgeformt werden können, selbst bei großen Linsenplatten.Furthermore, it can be seen here that the presented optics has no undercuts and is perfectly demoldable both by the
Im Allgemeinen weisen alle Optiken in einer Linsenplatte die gleiche Orientierung auf. Jedoch ergeben sich auch sinnvolle Anwendungen mit unterschiedlicher Orientierung, wenn etwa eine symmetrische Lichtverteilung benötigt wird, erzielbar durch Gegeneinanderstellen der Optiken. Ebenso kann mit einer kreisförmigen Anordnung der Optiken eine rotationssymmetrische Lichtverteilung, etwa zur Beleuchtung von Plätzen erzeugt werden.In general, all optics in a lens plate have the same orientation. However, useful applications with different orientations also result, if for example a symmetrical light distribution is required, achievable by juxtaposing the optics. Likewise, with a circular arrangement of the optics, a rotationally symmetrical light distribution, for example for the illumination of squares, can be generated.
In Ausgestaltung der Erfindung können auch unterschiedliche Optiken in einer Linsenplatte vorgesehen werden, um etwa eine Lichtverteilung durch Mischung vorhandener Optik-Geometrien zu erzielen.In an embodiment of the invention, different optics can be provided in a lens plate to achieve about a light distribution by mixing existing optical geometries.
Durch Modifizieren der LED-Position in der Optik ändert sich auch die Lichtverteilung. Hierdurch sind Anpassungen etwa an unterschiedliche Straßenbreiten oder Mastverhältnisse möglich, ohne an der optischen Geometrie der Linsenplatte und damit am Spritzgießwerkzeug Änderungen durchführen zu müssen.By modifying the LED position in the optics, the light distribution also changes. As a result, adjustments to different road widths or mast conditions are possible without having to make changes to the optical geometry of the lens plate and thus the injection mold.
Es können auch mehrere LEDs unter einer erfindungsgemäßen Optik angeordnet sein, insbesonders geometrisch minimierte Chip-LEDs, oder LEDs mit mehreren Halbleitern, oder Leiterplatten mit COB (Chip-on-Board)-Ausführung. Hierdurch wird die Lichtleistung entsprechend gesteigert, die Lichtverteilung jedoch unschärfer. In vielen Anwendungen ergibt sich hierdurch eine bessere Wirtschaftlichkeit bei akzeptabler Beleuchtungsqualität.It is also possible to arrange a plurality of LEDs under an optical system according to the invention, in particular geometrically minimized chip LEDs, or LEDs with a plurality of semiconductors, or printed circuit boards with COB (chip-on-board) design. As a result, the light output is increased accordingly, the light distribution, however, blurred. In many applications, this results in a better economy at acceptable illumination quality.
Claims (11)
- Lens plate optical system, preferably for lights having asymmetrical light emission, comprising, as a light source, printed circuit boards (1) having SMD LEDs (2), with a lens plate (9) that is arranged immediately in front of said LEDs and is made of transparent material, in particular plastics material, in which plate an optical lens system is arranged in front of each LED for light direction, the optical system (10) abutting the printed circuit board (1), by the rear side of said system, so as to surround the LED (2) and comprising a cavity which is divided by a lens partition (4), arranged laterally with respect to the LED (2), into a main cavity (5) for receiving the LED (2) and an adjacent secondary cavity (6), and a convex lens dome (7) having a light-directing rib (8) that is preferably formed integrally thereon being formed on the outer side, characterised in that the part (11a) of the LED light (11) that enters via the free-form surface (5a) of the main cavity (5) is directed completely towards the convex lens dome (7) and exits therethrough into space, and in that the other part (11b) of the LED light (11) enters via the converging lens (4a) of the lateral lens partition (4) and exits via the opposite surface (4b), is focused in its entirety towards the lens surface (6a) of the secondary cavity (6) and, from there, strikes the reflection surface (8b) of the light-directing rib (8), is substantially completely reflected thereon and exits into space via the front lens surface (8a) of the light-directing rib (8).
- Lens plate optical system according to claim 1, characterised in that the light (11) of the LED (2), which light is divided up and emitted into space by the two mutually aligned lens systems of the optical system (10), produces the required light distribution cooperatively.
- Lens plate optical system according to either claim 1 or claim 2, characterised in that the lens partition (4) is formed by two lens surfaces (4a, 4b) that are at least partially adjacent to one another.
- Lens plate optical system according to either claim 1, 2 or 3, characterised in that the main cavity (5) for receiving the LED (2) is formed by two adjacent lens surfaces (4a, 5a).
- Lens plate optical system according to at least one of claims 1 to 4, characterised in that the secondary cavity (6) is formed by two adjacent lens surfaces (4b, 6a).
- Lens plate optical system according to at least one of claims 1 to 5, characterised in that the front lens surface (8a) of the light-directing rib (8), which surface faces the lens dome (7), and the rear reflection surface (8b) thereof are adjacent at an acute angle.
- Lens plate optical system according to at least one of claims 1 to 6, characterised in that optical systems (10) according to the invention are arranged in any desired regular or irregular arrangement and even or uneven orientation inside the lens plate (9).
- Lens plate according to at least one of claims 1 to 7, characterised in that optical systems (10) according to the invention are arranged so as to be mixed with other optical systems in any desired regular or irregular arrangement inside the lens plate (9).
- Lens plate optical system according to at least one of claims 1 to 8, characterised in that a plurality of LEDs (2) are arranged beneath an optical system according to the invention.
- Lens plate optical system according to at least one of claims 1 to 9, characterised in that the printed circuit board (1) or the LEDs (2) thereof can adopt various positions with respect to the lens plate (9) and the light distribution properties can be altered as a result.
- Lens plate optical system according to at least one of claims 1 to 10, characterised in that, for the cost-effective manufacture of the lens plate (9) in an injection mould, the inclinations of all the surfaces do not form undercuts, which prevent direct demoulding.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14162432.0A EP2924345B1 (en) | 2014-03-28 | 2014-03-28 | Lighting devices with asymmetrical light distribution |
ES14162432.0T ES2691796T3 (en) | 2014-03-28 | 2014-03-28 | Luminaires with asymmetric light radiation |
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EP14162432.0A EP2924345B1 (en) | 2014-03-28 | 2014-03-28 | Lighting devices with asymmetrical light distribution |
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EP2924345A1 EP2924345A1 (en) | 2015-09-30 |
EP2924345B1 true EP2924345B1 (en) | 2018-07-18 |
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EP14162432.0A Not-in-force EP2924345B1 (en) | 2014-03-28 | 2014-03-28 | Lighting devices with asymmetrical light distribution |
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US10429035B2 (en) | 2017-01-25 | 2019-10-01 | Ledil Oy | Optical device for modifying light distribution |
US10274159B2 (en) | 2017-07-07 | 2019-04-30 | RAB Lighting Inc. | Lenses and methods for directing light toward a side of a luminaire |
DE102018103547A1 (en) * | 2018-02-16 | 2019-08-22 | Siteco Beleuchtungstechnik Gmbh | LAMP |
DE202019100380U1 (en) * | 2019-01-24 | 2020-04-27 | Zumtobel Lighting Gmbh | Arrangement for light emission with changeable light emission characteristics |
NL2025168B1 (en) * | 2020-03-19 | 2021-10-20 | Schreder Sa | Light emitting device with adaptable glare class |
AU2021238839A1 (en) * | 2020-03-19 | 2022-09-01 | Schreder S.A. | Light emitting device with adaptable glare class |
US11869358B2 (en) | 2021-10-29 | 2024-01-09 | Nortak Software Ltd. | System and method for warning of a presence of a mobile target |
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CN101699148A (en) | 2009-10-21 | 2010-04-28 | 苏州中泽光电科技有限公司 | Decentered lens for LED streetlight |
CN201764411U (en) | 2010-07-01 | 2011-03-16 | 雷笛克光学股份有限公司 | Polarizing streetlight optical lens |
CN102109132B (en) * | 2010-12-30 | 2013-11-13 | 北京朗波尔光电股份有限公司 | LED (Light Emitting Diode) light source assembly applied to low-order lighting and LED lamp applied to low-order lighting |
US9140430B2 (en) * | 2011-02-28 | 2015-09-22 | Cooper Technologies Company | Method and system for managing light from a light emitting diode |
CN102102851A (en) | 2011-03-24 | 2011-06-22 | 山东旭光太阳能光电有限公司 | Polarized lens suitable for power type LED (Light-Emitting Diode) streetlamp |
US20120307495A1 (en) * | 2011-06-06 | 2012-12-06 | Leotek Electronics Corporation | Optical lens and optical lens plate |
EP2834556B1 (en) * | 2012-04-06 | 2017-08-02 | Cree, Inc. | Multi-lens led-array optic system |
CN103471033B (en) | 2013-08-23 | 2015-06-10 | 中微光电子(潍坊)有限公司 | LED (light emitting diode) lens and lens module thereof |
-
2014
- 2014-03-28 EP EP14162432.0A patent/EP2924345B1/en not_active Not-in-force
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