DE202008009797U1 - LED-based lighting fixture - Google Patents

Abstract

LED-based lighting (1), comprising at least one module (2), which is an optical System (3) and a light transparent cover (4), wherein the optical system (3) at least one LED (5) and the one Light output cone of the LED (5) spanning Reflector (6) with facets (6.1), which in such a way certain angles to each other, that of the LED (5) emitted light substantially over the facets (6.1) of Reflektors (6) is directed to the light utility plane.

Description

LED, the long time due to the low light output and the lack of availability of all Light colors mainly only as an indicator lamp in seven segment and dot matrix displays use found, open up increasingly also other applications, eg. B. in lighting technology.

By the constantly progressive development of the LED, in particular by their cost-effective Production and improvement of their efficiency, solve them conventional bulbs, such as incandescent lamps or halogen lamps and are for some time u. a. as LED bundle in Traffic control systems, in flashlights or headlights of Vehicles used as mobile lighting or in LED-based televisions.

Problematic however, the use of the LED for LED-based lighting fixtures appears in Street lighting equipment, because the LED, in contrast to the conventional bulbs, the Light not on all sides, but only in shape at its light exit surface of a narrow cone of light, which in connection with the Cooperation of a previously known from the prior art reflector optics with a view to a uniform light distribution did not lead to an acceptable illumination of a large area of usable light.

Also the use of special mirrors, glass prisms or other lighting control systems led due to the specific structure of the LED and the resulting Photometric properties to no appreciable quality leap.

Out The prior art is also LED-based Street lighting concepts previously known, in which per LED module only a simple reflector optics is used, with the further beam shaping in the all modules downstream central luminaire optics was relocated. These solutions show however, they have the disadvantage that they are very costly size Require space and still not illuminate the light utility field homogeneously.

In summary can be determined that currently no LED-based street lights available in the market are those that meet the requirements in terms of energy saving and the illumination of streets according to applicable Standardization.

The The object of the invention is now a LED-based To propose lighting fixtures, the one for the achievement of the street lighting equipment required illuminance has suitable reflector optics, which has a nearly homogeneous clearance profile generated on the Lichtwendzebene and of an efficient relationship between Luminous flux and inserted power supplies.

According to the invention the LED-based lighting fixture at least from a module, which is an optical system and a having light transparent cover, wherein the optical system at least one LED and a light exit cone of the LED spanning Includes reflector with facets that are so in a specific Angles extend to each other that the light emitted by the LED essentially about the Facets of the reflector is directed to the Lichtwendzebene.

at A particularly preferred embodiment of the invention is the light emitted by the LED exclusively and thus only indirectly via the facets of the reflector directed to the light utility plane. This is achieved by by the reflector almost the LED in the relatively small area of its light exit surface Completely shields.

Of the the light exit cone of the LED spanning Reflector is sufficient to form a gap of the light exit surface of the LED spaced so that the light emitted by the LED in the area the light exit surface the LED unhindered and complete can illuminate the reflector.

Of the reflector according to the invention is to generate a different from the light exit cone of the LED Beam shape formed. In a particularly preferred embodiment According to the invention, the reflector has a cross-section substantially Double T-shape with two opposing flanges and a web extending between the flanges. The two Flanges and the web extending between the flanges each of several facets that are in more than two levels to each other extend. For generating a preferably indirect light beam of the LED-based lighting fixture the reflector extends over the LED such that the light exit cone the LED is essentially spanned by the bridge.

In principle, it is possible either to manufacture the reflector completely from a reflective material or from a reflector carrier with a reflective coating applied thereto. For cost reasons and for reasons of weight reduction would be in practice preferably use a plastic reflector carrier, on the LED pointing side a reflector layer or mirror layer is brought to the facets.

Of the Shape of the reflector, in particular its facets, was (n) in elaborate measuring and calculating methods with regard to their shape and size. The generated by the facets of the reflector on the Lichtwendzebene Clearance profile or the beam shape generated by the reflector essentially has a butterfly shape. Compared to the be known from the prior art LED-based lighting fixtures with the LED-based according to the invention lighting generated almost homogeneous light spaces without dark spots; when without for User visible peaks or valleys of light waves. This is especially true advantageous if required to be illuminated homogeneously Lichtünzebenen are.

Of the LED-based according to the invention lighting can be just one module and for the purpose of a higher illuminance several Include modules. Independently of the number of interconnected modules corresponds to the thereby resulting common beam shape or the total light space profile essentially a butterfly shape that appears on the Lichtwendzebene. Remains according to the invention when forming an LED-based lighting fixture with several Modules, in case of failure of one of these modules, that of the remaining ones Modules generated overall clear space profile unchanged.

The optical system of the LED-based lighting fixture is preferably arranged within a base unit, which for receiving an LED carrier board formed with the LED arranged thereon and the reflector is. For targeted and better heat dissipation, the optical system one at the back the LED carrier board, respectively the LED side facing away from the LED carrier board, arranged arranged Wärmeleitschicht. This heat conducting layer is preferred as a heat conducting foil formed in the form of a metal foil.

Of the LED-based lighting fixtures is both for the illumination and illumination of interiors as well as for outdoor applications designed accordingly. To avoid dirt deposits and aging is that of the optical system and The light-transparent cover module built gas-tight encapsulated.

Provided, As already mentioned, several modules are used within an LED-based lighting fixture These are preferably matrix-like in columns and rows arranged to each other and interconnected.

To the Switching on and off of individual modules or groups of modules a control or regulating device is provided. Furthermore, the LED-based lighting Several sensors are included for energy saving, for customization in different light conditions and to implement user requests, for example, for switching on and off, are used. These sensors are as sensors for color control and / or designed for personal identification and / or for brightness control and coupled to the controller or controller. It's about it found to be particularly advantageous if, for example, the illuminance and / or illumination color of the LED depending on weather and user Use of these aforementioned sensors and the control / regulation are formed controllable.

Further the LED of each module has contrast-changing properties, thereby reducing the efficiency and significantly increase the performance of the new LED-based lighting fixture.

One suitable field of application of the LED-based lighting fixture is the streets- and space lighting, in the homogeneously illuminating Lichtünzebenen not only desired without dark spots, but also required by law. Dependent on the lighting height the for the street lighting used LED-based lighting fixture can its modules in number be either variable or at an unchanged number of modules, the terminal voltage adapted to the modules, d. H. increased or decreased. It is also possible Control modules only in groups.

A particularly preferred embodiment of such an LED-based lighting fixture for street lamps has an elliptical shape in cross section, wherein a plurality of elliptical elements placed one above the other together form the housing provided for receiving a plurality of modules. For this purpose, smaller and larger elliptical elements are arranged alternately in cross-section, wherein the larger in cross section and outwardly projecting elements are used for optimal heat dissipation. The preferably made of aluminum and the housing of the street lamp forming ellipses have only a very low construction height in a range between 7 cm and 15 cm. This extremely flat design is achieved using the particularly space-saving reflection optics of the LED-based lighting fixture according to the invention. The beam shaping of the emitted light takes place in each case in the modules by means of the reflector. One of the respective modules Downstream beam forming common to all modules by means of a central luminaire optics is no longer necessary according to the invention.

• • durch Einsatz eines speziell geformten und die LED überspannenden Reflektors mit vielen Facetten wird das von der LED emittierte Licht im Wesentlichen über die Facetten des Reflektors zur Lichtnutzebene gelenkt,
• • der im Querschnitt im Wesentlichen Doppel-T-förmig ausgebildete Reflektor generiert eine von dem Lichtaustrittskegel der LED verschiedene Strahlform,
• • die vom Reflektor erzeugte Strahlform weist im Wesentlichen eine auf der Lichtnutzebene erzeugte Schmetterlingsform bzw. ein im Querschnitt schmetterlingsartig ausgebildetes Lichtraumprofil auf,
• • der LED-basierende Beleuchtungskörper ist modulartig aufgebaut, was die Redundanz und die Ausfallzeiten wesentlich verringert,
• • bei Ausbildung eines LED-basierenden Beleuchtungskörpers mit mehreren Modulen bleibt im Defektfall eines oder mehrere dieser Module das von den verbleibenden Modulen erzeugte Gesamtlichtraumprofil unverändert,
• • jedes einzelne Modul ist werkseitig gasdicht gekapselt gefertigt, wodurch die die Leuchtstärke verringernden Ab- und Anlagerungen sowie die Alterungsprozesse vermieden werden und eine modulare Austauschbarkeit ermöglicht wird,
• • mittels der erstmals für die Straßenbeleuchtung tatsächlich nutzbaren LED mit ihren lichttechnischen Eigenschaften wird eine Harmonie zwischen eingesetzter Leistung und dem zur Verfügung stehenden Lichtstrom erreicht,
• • der vorzugsweise für die Straßenbeleuchtung entwickelte LED-basierende Beleuchtungskörper sichert hohe Standzeiten und verringert die Wartungsintervalle signifikant,
• • die Beleuchtungsstärke des LED-basierenden Beleuchtungskörpers kann problemlos unter Verwendung einer Regelung/Steuerung durch eine Zu- oder Abschaltung einzelner Module oder Modulgruppen oder durch eine Anpassung der Anschlussspannung variiert werden und
• • der LED-basierende Beleuchtungskörper kann durch einen Anwender gefahrenfrei und problemlos montiert werden.

The significant advantages and features of the invention over the prior art are essentially:

• By using a specially shaped and multi-faceted LED-spanning reflector, the light emitted by the LED is directed essentially to the light utility plane via the facets of the reflector.
• The reflector which has a substantially double T-shaped cross-section generates a beam shape which differs from the light-emitting cone of the LED,
• The beam shape generated by the reflector essentially has a butterfly shape generated on the light utility plane or a clearance profile formed in a butterfly-like manner in cross-section,
• • the LED-based lighting fixture is modular, which significantly reduces redundancy and downtime,
• If an LED-based lighting fixture with a plurality of modules is formed, if one or more of these modules is defective, the total light-space profile generated by the remaining modules remains unchanged;
• • each module is gas-tight encapsulated at the factory, eliminating the build-up and build-up that reduces luminance and aging processes, and allowing modular interchangeability;
• • by means of the LED, which can be used for street lighting for the first time, with its technical lighting properties, a harmony between the installed power and the available luminous flux is achieved
• • The LED-based lighting fixture, which was developed especially for street lighting, ensures a long service life and significantly reduces maintenance intervals.
• • The illuminance of the LED-based lighting fixture can easily be varied using a control / control by switching individual modules or groups of modules on or off, or by adapting the supply voltage
• • The LED-based lighting fixture can be mounted safely and easily by a user.

The The aims and advantages of this invention are, after careful study the following detailed Description of the preferred, non-limiting example embodiments herein the invention with the associated To better understand and evaluate drawings that show:

1 : an exploded view of the LED-based lighting fixture,

2 : the reflector in a perspective view from above and

3 : the reflector in a further perspective view, laterally.

The 1 shows an exploded view of the LED-based lighting fixture according to the invention 1 , The LED lighting fixture 1 includes in the example shown only a single module 2 , The module 2 consists of an optical system 3 and a light transparent cover 4 with a transmittance of about 70%, preferably an anti-reflective glass. The optical system 3 and its transparent cover 4 are tightly interconnected for the purpose of forming a gas tight capsule using a gasket, represented by a dashed line. For assembly reasons, has proven particularly advantageous when the optical system 3 within a preferably metallic base unit 10 , as shown, is placed. The optical system 3 includes a yellow LED 5 and one the light exit cone of the LED 5 spanning reflector 6 with facets 6.1 , which extend at a certain angle to each other, that of the LED 5 emitted light exclusively and thus only indirectly via the facets 6.1 of the reflector 6 reaches the light utility plane. The cross-section substantially double-T-shaped reflector 6 is constructed of a reflector carrier made of plastic with a reflective coating applied thereto. Within the base unit 10 is also an LED carrier board 8th for receiving the LED arranged thereon 5 as well as the reflector 6 arranged. At the back of the LED carrier board 8th , respectively the LED 5 remote side of the LED carrier board 8th is provided for the purpose of better heat dissipation Wärmeleitschicht in the form of a copper or aluminum existing Wärmeleitfolie.

The 2 and 3 show one and the same reflector according to the invention 6 in a detailed perspective view from above and a lateral perspective view. The essentially in cross section double T-shaped reflector 6 corresponds to an irregularly shaped, but symmetrical body with two flanges 6.2 and a jetty 6.3 , The length is about 50 mm, the width about 40 mm and the height only 21 mm. The effectively available reflection surface is 7.5 × 10.1 mm ² . The symmetry axis of the reflector 6 is orthogonal to the light axis in the direction of the longitudinal axis of the web 6.3 , The two opposite flanges 6.2 and between the flanges 6.2 erstre clogging footbridge 6.3 each include the LED 5 pointing facets 6.1 , wherein in the example shown the light exit cone of the LED 5 completely off the jetty 6.3 of the reflector 6 is overstretched. The individual facets 6.1 extend in such a way at a certain angle to each other, that of the LED 5 emitted light exclusively only indirectly through the facets 6.1 of the reflector 6 reaches the light utility plane. As can be seen by the viewer, the footbridge tapers 6.3 of the reflector 6 starting from its top to the LED facing bottom. The facets 6.1 are designed as Oktagon different size, and extend from the top of the reflector 6 up to the wedge-shaped underside of the reflector 6 , Between the bottom of the reflector 6 and on an LED carrier board 8th arranged LED 5 is a gap 7 designed so that by the LED 5 Light emitted all facets unhindered 6.1 of the reflector 6 can illuminate. By means of the facets 6 a beam shape is generated which depends on the beam shape of the light exit cone of the LED 5 is different. The generated on the light utility plane clearance profile or the beam shape substantially corresponds to a butterfly shape with almost homogeneous light space fields without dark spots.

In an unillustrated matrix-like arrangement of 20 modules 2 with an arrangement of 4 × 5 modules for use as an LED-based street light, an electrical connection power of 100 watts is required. The of all modules 2 combined illuminance is 10 lx, resulting in an LED-based lighting fixture placed at an illumination height of 8 m 1 a Lichtwendzebene can illuminate homogeneously with an area of about 40 × 7.5 m ² .

1

LED-based lighting

2

module

3

optical system

4

cover

5

LED

6

reflector

6.1

facet

6.2

flange

6.3

web

7

gap

8th

LED carrier board

9

heat conducting

10

base unit

11

poetry

Claims (18)

LED-based lighting fixture ( 1 ), consisting of at least one module ( 2 ), which is an optical system ( 3 ) and a light transparent cover ( 4 ), wherein the optical system ( 3 ) at least one LED ( 5 ) and the light exit cone of the LED ( 5 ) spanning reflector ( 6 ) with facets ( 6.1 ), which extend at a certain angle to each other in such a way that that of the LED ( 5 ) emitted light substantially over the facets ( 6.1 ) of the reflector ( 6 ) is directed to the light utility plane. LED-based lighting fixture ( 1 ) according to claim 1, characterized in that that of the LED ( 5 ) emitted light exclusively and thus only indirectly via the facets ( 6.1 ) of the reflector ( 6 ) is directed to the light utility plane. LED-based lighting fixture ( 1 ) according to claim 1 or 2, characterized in that the light exit cone of the LED ( 5 ) spanning reflector ( 6 ) forming a gap ( 7 ) sufficiently from the light exit surface of the LED ( 5 ) is spaced. LED-based lighting fixture ( 1 ) according to one of claims 1 to 3, characterized in that the reflector ( 6 ) is designed to generate a beam shape that depends on the beam shape of the light exit cone of the LED ( 5 ) is different. LED-based lighting fixture ( 1 ) according to one of claims 1 to 4, characterized in that the generated on the Lichtwendzebene clearance profile or the beam shape substantially corresponds to a butterfly shape with almost homogeneous Lichtraumfeldern without dark spots. LED-based lighting fixture ( 1 ) according to one of claims 1 to 5, characterized in that both the beam shape of each individual module ( 2 ) as well as the interconnection of several modules ( 2 ) resulting common beam shape or the total light space profile substantially corresponds to a butterfly shape. LED-based lighting fixture ( 1 ) according to one of claims 1 to 6, characterized in that the reflector ( 6 ) are formed in cross-section substantially double-T-shaped, wherein the two flanges ( 6.2 ) and between the flanges ( 6.2 ) extending bridge ( 6.3 ) facets ( 6.1 ), and the light exit cone of the LED ( 5 ) essentially from the bridge ( 6.3 ) of the reflector ( 6 ) is spanned. LED-based lighting fixture ( 1 ) according to one of claims 1 to 7, characterized in that the reflector ( 6 ) consists either entirely of a reflective material or of a reflector support with a reflective coating applied thereto. LED-based lighting fixture ( 1 ) according to one of claims 1 to 8, characterized in that the optical system ( 3 ) arranged within a base unit, which for receiving an LED carrier board ( 8th ) with the LED arranged thereon ( 5 ) as well as the reflector ( 6 ) is trained. LED-based lighting fixture ( 1 ) according to one of claims 1 to 9, characterized in that the optical system ( 3 ) one on the back of the LED carrier board ( 8th ), respectively the LED ( 5 ) facing away from the LED carrier board ( 8th ), arranged Wärmeleitschicht ( 9 ) having. LED-based lighting fixture ( 1 ) according to one of claims 1 to 10, characterized in that the optical system ( 3 ) and the light transparent cover ( 4 ) module ( 2 ) is sealed gas-tight. LED-based lighting fixture ( 1 ) according to one of claims 1 to 11, characterized in that the LED-based lighting body ( 1 ) several modules ( 2 ), which are arranged in a matrix-like manner to each other and interconnected. LED-based lighting fixture ( 1 ) according to one of claims 1 to 12, characterized in that when forming an LED-based lighting fixture ( 1 ) with several modules ( 2 ) in case of failure of one or more of these modules ( 2 ), of the remaining modules ( 2 ) remains unchanged. LED-based lighting fixture ( 1 ) according to one of claims 1 to 13, characterized in that a control or regulating device is provided in order to 2 ) can be switched on or off individually or in groups. LED-based lighting fixture ( 1 ) according to one of claims 1 to 14, characterized in that sensors are provided for color control and / or personal identification and / or brightness control, which are coupled to the controller or controller. LED-based lighting fixture ( 1 ) according to one of claims 1 to 15, characterized in that the illuminance and / or illumination color of the LED ( 5 ) is weather-dependent or user-dependent using sensors and the control / control is controllable. LED-based lighting fixture ( 1 ) according to one of claims 1 to 16, characterized in that the LED used ( 5 ) have contrast-altering properties. LED-based lighting fixture ( 1 ) according to one of claims 1 to 17, characterized in that the LED-based lighting body ( 1 ) is used for street lights or space lighting, depending on the illumination height, the number of lighting fixtures for the LED ( 1 ) used modules ( 2 ) is either variable or, with an unchanged number of modules, the terminal voltage of the modules ( 2 ) is adjusted accordingly, ie increased or decreased.