FR2784739A1 - Lighting unit for deploying at height, comprises a diode assembly and a transparent barrel assembly to transmit the light - Google Patents

Lighting unit for deploying at height, comprises a diode assembly and a transparent barrel assembly to transmit the light Download PDF

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Publication number
FR2784739A1
FR2784739A1 FR9813227A FR9813227A FR2784739A1 FR 2784739 A1 FR2784739 A1 FR 2784739A1 FR 9813227 A FR9813227 A FR 9813227A FR 9813227 A FR9813227 A FR 9813227A FR 2784739 A1 FR2784739 A1 FR 2784739A1
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France
Prior art keywords
cavity
diodes
bar
lighting device
height
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Granted
Application number
FR9813227A
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French (fr)
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FR2784739B1 (en
Inventor
Jean Pierre Valancogne
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3SA
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3SA
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Priority to FR9813227A priority Critical patent/FR2784739B1/en
Publication of FR2784739A1 publication Critical patent/FR2784739A1/en
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Publication of FR2784739B1 publication Critical patent/FR2784739B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
    • G02B6/0006—Coupling light into the fibre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • 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
    • F21S8/08—Lighting devices intended for fixed installation with a standard
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
    • G02B6/0008—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type the light being emitted at the end of the fibre
    • 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
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • 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]

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The lighting unit comprises a diode array (5) located within a base unit (3). A transparent barrel (7) is placed on top of the diode array with one of its extreme faces (7a) in close proximity. The barrel is topped with a mirror (10) that reflects the light back down the barrel but through a ground glass lens or prism array (9). Th barrel is secured to the base unit with a collar (6).

Description

La présente invention concerne un dispositif d'éclairage destiné à tre placé en hauteur, notamment en haut d'un mât ou d'un poteau en site urbain. The present invention relates to a lighting device intended to be placed at a height, in particular at the top of a mast or a pole in an urban site.

II est usuel de réaliser un éclairage de ce type en plaçant des diodes électroluminescentes à l'intérieur d'un cabochon en verre dépoli. De telles diodes ont pour avantage, par rapport à des ampesà incandescence, de ne requérir que très peu d'entretien, ce qui est important dans le cas d'éclairages peu accessibles. Les dispositifs existants ont toutefois pour inconvénient de fournir un éclairage peu homogène compte tenu des faisceaux lumineux ponctuels que produisent les diodes. It is usual to produce lighting of this type by placing light-emitting diodes inside a frosted glass cabochon. Compared to incandescent bulbs, such diodes have the advantage of requiring very little maintenance, which is important in the case of inaccessible lighting. However, existing devices have the drawback of providing inconsistent lighting given the point light beams produced by the diodes.

II peut tre envisagé de placer les diodes selon plusieurs plateaux circulaires empilés, avec décalage angulaire des diodes d'un plateau par rapport aux diodes d'un plateau adjacent, comme décrit dans le brevet français n 2 714 956, en vue d'additionner plusieurs faisceaux de diodes dans une direction donnée. L'éclairage produit reste toutefois moyennement homogène, et le nombre de diodes complexifie et renchérit excessivement le dispositif pour une utilisation en site urbain, dans un but avant tout décoratif. It can be envisaged to place the diodes according to several stacked circular plates, with angular offset of the diodes of a plate relative to the diodes of an adjacent plate, as described in French patent No. 2,714,956, in order to add several diode beams in a given direction. However, the lighting produced remains moderately homogeneous, and the number of diodes excessively complicates and increases the cost of the device for use on urban sites, with a primarily decorative aim.

La présente invention vise à remédier aux inconvénients précités, en fournissant un dispositif simple, peu onéreux, ne requérant pas d'entretien et susceptible de produire, avec un nombre de diodes limité, un signal lumineux visible de façon sensiblement homogène par un observateur situé à une hauteur inférieure à celle de ce dispositif. The present invention aims to remedy the aforementioned drawbacks, by providing a simple, inexpensive device, requiring no maintenance and capable of producing, with a limited number of diodes, a light signal visible in a substantially homogeneous manner by an observer located at a height less than that of this device.

A cet effet, ce dernier comprend :
-une série de diodes placées au voisinage les unes des autres et émettant leurs faisceaux sensiblement dans une mme direction ;
-un barreau en matériau transparent, dont une face d'extrémité est placée à proximité immédiate des diodes et dont l'autre extrémité comporte une cavité aménagée en elle, cette cavité étant délimitée par une paroi dépolie.To this end, the latter includes:
a series of diodes placed in the vicinity of each other and emitting their beams substantially in the same direction;
a rod made of transparent material, one end face of which is placed in the immediate vicinity of the diodes and the other end of which has a cavity arranged in it, this cavity being delimited by a frosted wall.

Les faisceaux émis par les diodes traversent ainsi le barreau jusqu'à rencontrer la paroi dépolie délimitant ladite cavité, qui provoque une diffusion de la lumière émise et une homogénéisation des faisceaux. The beams emitted by the diodes thus pass through the bar until they meet the frosted wall delimiting said cavity, which causes a diffusion of the light emitted and a homogenization of the beams.

L'ensemble de cette paroi est ainsi éclairé de manière homogène et constitue par conséquent une zone lumineuse clairement visible par un observateur situé à une hauteur inférieure à celle du dispositif.The whole of this wall is thus homogeneously lit and therefore constitutes a luminous zone clearly visible by an observer located at a height lower than that of the device.

Le barreau a de préférence une section circulaire et la cavité a une forme de révolution, pour l'obtention d'une totale homogénéité de l'éclairage sur 360 .  The bar preferably has a circular section and the cavity has a shape of revolution, to obtain a total homogeneity of the lighting on 360.

De préférence, au moins une portion de la paroi délimitant la cavité est inclinée de l'intérieur vers l'extérieur du barreau, en allant dans le sens du passage de la lumière émise par les diodes. Preferably, at least a portion of the wall delimiting the cavity is inclined from the inside towards the outside of the bar, going in the direction of the passage of the light emitted by the diodes.

L'inclinaison de cette paroi permet d'augmenter la quantité de lumière réfléchie par la paroi, et donc l'intensité de l'éclairage produit. The inclination of this wall makes it possible to increase the amount of light reflected by the wall, and therefore the intensity of the lighting produced.

La cavité peut notamment avoir une forme conique. The cavity may in particular have a conical shape.

Avantageusement, le barreau est surmonté d'un miroir dont la face réfléchissante est tournée en direction de la cavité. Ce miroir constitue un amplificateur de l'éclairage produit par le dispositif. De préférence, ce miroir est fixé sur l'extrémité supérieure du barreau, de manière étanche. Le volume de la cavité est ainsi fermé, ce qui empche toute introduction de salissures diverses, particulièrement pour une utilisation en extérieur. Advantageously, the bar is surmounted by a mirror whose reflecting face is turned towards the cavity. This mirror constitutes an amplifier of the lighting produced by the device. Preferably, this mirror is fixed to the upper end of the bar, in a sealed manner. The volume of the cavity is thus closed, which prevents any introduction of various soils, particularly for outdoor use.

Pour sa bonne compréhension, l'invention est à nouveau décrite ci-après, en référence au dessin schématique annexé représentant, titre d'exemples non limitatifs, plusieurs variantes de réalisation du dispositif qu'elle concerne. For a good understanding, the invention is again described below, with reference to the appended schematic drawing representing, by way of nonlimiting examples, several alternative embodiments of the device which it relates to.

La figure 1 est une vue en coupe du dispositif selon une forme de réalisation, et
les figures 2 à 7 sont des vues partielles, en coupe, du dispositif selon différentes variantes.FIG. 1 is a sectional view of the device according to one embodiment, and
Figures 2 to 7 are partial views, in section, of the device according to different variants.

Par simplification, les éléments similaires qui se retrouvent d'une variante à une autre sont définis par les mmes références numériques. For simplification, similar elements which are found from one variant to another are defined by the same reference numerals.

La figure 1 représente un dispositif d'éclairage 1 destiné à tre placé en hauteur, notamment en haut d'un mât 2 ou d'un poteau en site urbain. Dans l'exemple montré, le dispositif 1 comprend une platine 3 retiée au mât 2 par tous moyens de fixation appropriés, non représentés. FIG. 1 represents a lighting device 1 intended to be placed at a height, in particular at the top of a mast 2 or of a pole on an urban site. In the example shown, the device 1 comprises a plate 3 retained on the mast 2 by any suitable fixing means, not shown.

La platine 3 comprend un alésage central 4 logeant une série de diodes électroluminescentes 5, et reçoit un couvercle 6, fixé sur elle, dans lequel est montée l'extrémité inférieure d'un barreau 7 en matière transparente, notamment en polyméthacrylate. The plate 3 comprises a central bore 4 housing a series of light-emitting diodes 5, and receives a cover 6, fixed on it, in which is mounted the lower end of a bar 7 made of transparent material, in particular polymethacrylate.

Les diodes 5 sont de type classique, et sont reliées à une alimentation (non représentée). Ainsi que cela apparaît sur la figure, elles sont placées au voisinage les unes des autres et émettent leurs faisceaux, schématisés par les flèches 8, sensiblement dans la mme direction. The diodes 5 are of the conventional type, and are connected to a power supply (not shown). As shown in the figure, they are placed in the vicinity of each other and emit their beams, shown diagrammatically by the arrows 8, substantially in the same direction.

Le barreau 7 présente une forme générale cylindrique ; sa face inférieure 7a est placée à proximité immédiate des diodes 5 et son autre extrémité comporte une cavité 9 de forme conique aménagée en elle. The bar 7 has a generally cylindrical shape; its lower face 7a is placed in the immediate vicinity of the diodes 5 and its other end comprises a cavity 9 of conical shape arranged in it.

Cette cavité 9 est délimitée par une paroi dépolie 7b. Le dépoli peut simplement résulter de l'usinage du barreau 7 pour aménager la cavité 9. This cavity 9 is delimited by a frosted wall 7b. The frosting can simply result from the machining of the bar 7 to arrange the cavity 9.

Un miroir 10 dont la face réfléchissante est tournée en direction de la cavité 9 est fixé sur l'extrémité supérieure du barreau 7, de manière étanche. A mirror 10, the reflecting face of which is turned towards the cavity 9 is fixed to the upper end of the bar 7, in a sealed manner.

Les faisceaux émis par les diodes 5 traversent ainsi le barreau 7 jusqu'à rencontrer la paroi 7b, qui provoque une diffusion de la lumière émise et une homogénéisation des faisceaux, tandis que le miroir 10 constitue un amplificateur de l'éclairage produit. The beams emitted by the diodes 5 thus pass through the bar 7 until they meet the wall 7b, which causes a diffusion of the emitted light and a homogenization of the beams, while the mirror 10 constitutes an amplifier of the lighting produced.

L'invention permet ainsi de fournir un dispositif simple, peu onéreux, ne requérant pas d'entretien et propre à produire, avec un nombre limité de diodes, un signal lumineux visible de façon homogène par un observateur situé à une hauteur inférieure à celle de ce dispositif.  The invention thus makes it possible to provide a simple, inexpensive, maintenance-free device capable of producing, with a limited number of diodes, a light signal visible in a homogeneous manner by an observer located at a height lower than that of these measures.

Claims (6)

REVENDICATIONS 1-Dispositif d'éclairage (1) destiné à tre placé en hauteur, notamment en haut d'un mat (2) ou d'un poteau en site urbain, caractérisé en ce qu'il comprend : 1-Lighting device (1) intended to be placed at a height, in particular at the top of a mast (2) or of a pole on an urban site, characterized in that it comprises: -une série de diodes (5) placées au voisinage les unes des autres et émettant leurs faisceaux sensiblement dans une mme direction ; a series of diodes (5) placed in the vicinity of each other and emitting their beams substantially in the same direction; -un barreau (7) en matériau transparent, dont une face d'extrémité (7a) est placée à proximité immédiate des diodes (5) et dont l'autre extrémité comporte une cavité (9) aménagée en elle, cette cavité (9) étant délimitée par une paroi dépolie (7b). a rod (7) made of transparent material, one end face (7a) of which is placed in the immediate vicinity of the diodes (5) and the other end of which has a cavity (9) arranged in it, this cavity (9) being delimited by a frosted wall (7b). 2-Dispositif d'éclairage selon la revendication 1, caractérisé en ce que le barreau (7) a une section circulaire et en ce que la cavité (9) a une forme de révolution. 2-Lighting device according to claim 1, characterized in that the bar (7) has a circular section and in that the cavity (9) has a shape of revolution. 3-Dispositif d'éclairage selon la revendication 1 ou la revendication 2, caractérisé en ce qu'au moins une portion de la paroi (7b) délimitant la cavité (9) est inclinée de l'intérieur vers l'extérieur du barreau (7), en allant dans le sens du passage de la lumière émise par les diodes (5). 3-Lighting device according to claim 1 or claim 2, characterized in that at least a portion of the wall (7b) delimiting the cavity (9) is inclined from the inside to the outside of the bar (7 ), going in the direction of the passage of the light emitted by the diodes (5). 4-Dispositif d'éclairage selon la revendication 3, caractérisé en ce que la cavité (9) a une forme conique. 4-Lighting device according to claim 3, characterized in that the cavity (9) has a conical shape. 5-Dispositif d'éclairage selon l'une des revendications 1 à 4, caractérisé en ce que le barreau (7) est surmonté d'un miroir (10) dont la face réfléchissante est tournée en direction de la cavité (9). 5-Lighting device according to one of claims 1 to 4, characterized in that the bar (7) is surmounted by a mirror (10) whose reflecting face is turned towards the cavity (9). 6-Dispositif d'éclairage selon la revendication 5, caractérisé en ce que le miroir (10) est fixé sur l'extrémité supérieure du barreau (7), de manière étanche.  6-A lighting device according to claim 5, characterized in that the mirror (10) is fixed on the upper end of the bar (7), sealingly.
FR9813227A 1998-10-19 1998-10-19 LIGHTING DEVICE FOR PLACEMENT AT HEIGHT Expired - Fee Related FR2784739B1 (en)

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Application Number Priority Date Filing Date Title
FR9813227A FR2784739B1 (en) 1998-10-19 1998-10-19 LIGHTING DEVICE FOR PLACEMENT AT HEIGHT

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FR2784739B1 FR2784739B1 (en) 2004-12-17

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002040917A2 (en) * 2000-11-15 2002-05-23 Teledyne Lighting & Display Products, Inc. Strip lighting apparatus and method
GB2387220A (en) * 2002-03-26 2003-10-08 William John Wilkinson Belisha beacon
WO2005095848A1 (en) * 2004-03-27 2005-10-13 Graham Morton An illumination device
EP2251589A3 (en) * 2009-04-28 2013-11-27 Burri public elements AG External light with pulling and reflector rod
WO2015042183A1 (en) * 2013-09-17 2015-03-26 Quarkstar Llc Illumination device for direct-indirect illumination
US9028120B2 (en) 2011-08-08 2015-05-12 Quarkstar Llc Illumination devices including multiple light emitting elements
US9081125B2 (en) 2011-08-08 2015-07-14 Quarkstar Llc Illumination devices including multiple light emitting elements
CZ305927B6 (en) * 2015-08-03 2016-05-04 Hella Autotechnik Nova, S.R.O. Light guide, especially for lights of means of conveyance
US9746173B2 (en) 2012-09-13 2017-08-29 Quarkstar Llc Illumination devices including enclosure panels with luminaire modules
US9846272B2 (en) 2012-09-13 2017-12-19 Quarkstar Llc Illumination systems providing direct and indirect illumination
US10132988B2 (en) 2013-07-18 2018-11-20 Quarkstar Llc Luminaire module with multiple light guide elements
US10180240B2 (en) 2013-04-19 2019-01-15 Quarkstar Llc Illumination devices with adjustable optical elements

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WO2014124285A2 (en) 2013-02-08 2014-08-14 Quarkstar Llc Illumination device providing direct and indirect illumination

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002040917A2 (en) * 2000-11-15 2002-05-23 Teledyne Lighting & Display Products, Inc. Strip lighting apparatus and method
WO2002040917A3 (en) * 2000-11-15 2004-02-26 Teledyne Lighting & Display Pr Strip lighting apparatus and method
GB2387220A (en) * 2002-03-26 2003-10-08 William John Wilkinson Belisha beacon
GB2387220B (en) * 2002-03-26 2005-07-27 William John Wilkinson Belisha beacon
WO2005095848A1 (en) * 2004-03-27 2005-10-13 Graham Morton An illumination device
EP2251589A3 (en) * 2009-04-28 2013-11-27 Burri public elements AG External light with pulling and reflector rod
US9081125B2 (en) 2011-08-08 2015-07-14 Quarkstar Llc Illumination devices including multiple light emitting elements
US9028120B2 (en) 2011-08-08 2015-05-12 Quarkstar Llc Illumination devices including multiple light emitting elements
US10859758B2 (en) 2011-08-08 2020-12-08 Quarkstar Llc Illumination devices including multiple light emitting elements
US11703631B2 (en) 2011-08-08 2023-07-18 Quarkstar Llc Illumination devices including multiple light emitting elements
US10190762B2 (en) 2012-09-13 2019-01-29 Quarkstar Llc Devices for workspace illumination having a panel forming an enclosure and a plurality of light emitters with primary and secondary optics
US9746173B2 (en) 2012-09-13 2017-08-29 Quarkstar Llc Illumination devices including enclosure panels with luminaire modules
US9846272B2 (en) 2012-09-13 2017-12-19 Quarkstar Llc Illumination systems providing direct and indirect illumination
US10180240B2 (en) 2013-04-19 2019-01-15 Quarkstar Llc Illumination devices with adjustable optical elements
US10838138B2 (en) 2013-07-18 2020-11-17 Quarkstar Llc Luminaire module with multiple light guide elements
US10288798B2 (en) 2013-07-18 2019-05-14 Quarkstar Llc Illumination device in which source light injection is non-parallel to device's optical axis
US10132988B2 (en) 2013-07-18 2018-11-20 Quarkstar Llc Luminaire module with multiple light guide elements
US10094969B2 (en) 2013-09-17 2018-10-09 Quarkstar Llc Illumination device for direct-indirect illumination
US10203446B2 (en) 2013-09-17 2019-02-12 Quarkstar Llc Light guide illumination device with light divergence modifier
US9891371B2 (en) 2013-09-17 2018-02-13 Quarkstar Llc Light guide illumination device for direct-indirect illumination
CN110043874A (en) * 2013-09-17 2019-07-23 夸克星有限责任公司 For directly-indirect lighting lighting device
US10495807B2 (en) 2013-09-17 2019-12-03 Quarkstar Llc Light guide illumination device for direct-indirect illumination
CN110553165A (en) * 2013-09-17 2019-12-10 夸克星有限责任公司 Light guide illumination device for direct-indirect illumination
US10705284B2 (en) 2013-09-17 2020-07-07 Quarkstar Llc Luminaire with luminaire module
US10725229B2 (en) 2013-09-17 2020-07-28 Quarkstar Llc Illumination device for direct-indirect illumination
US9664839B2 (en) 2013-09-17 2017-05-30 Quarkstar Llc Illumination device for direct-indirect illumination
US11150400B2 (en) 2013-09-17 2021-10-19 Quarkstar Llc Illumination device for direct-indirect illumination
US11693174B2 (en) 2013-09-17 2023-07-04 Quarkstar Llc Illumination device for direct-indirect illumination
WO2015042183A1 (en) * 2013-09-17 2015-03-26 Quarkstar Llc Illumination device for direct-indirect illumination
CZ305927B6 (en) * 2015-08-03 2016-05-04 Hella Autotechnik Nova, S.R.O. Light guide, especially for lights of means of conveyance

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