EP4364127A1 - Dispositif d'éclairage de sortie de secours pourvu d'un élément de guidage de lumière - Google Patents

Dispositif d'éclairage de sortie de secours pourvu d'un élément de guidage de lumière

Info

Publication number
EP4364127A1
EP4364127A1 EP22738382.5A EP22738382A EP4364127A1 EP 4364127 A1 EP4364127 A1 EP 4364127A1 EP 22738382 A EP22738382 A EP 22738382A EP 4364127 A1 EP4364127 A1 EP 4364127A1
Authority
EP
European Patent Office
Prior art keywords
light
guiding element
escape
pictogram
luminaire 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.)
Pending
Application number
EP22738382.5A
Other languages
German (de)
English (en)
Inventor
Andreas Machate
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.)
Zumtobel Lighting GmbH
Original Assignee
Zumtobel Lighting 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 Zumtobel Lighting GmbH filed Critical Zumtobel Lighting GmbH
Publication of EP4364127A1 publication Critical patent/EP4364127A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/18—Edge-illuminated signs
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0409—Arrangements for homogeneous illumination of the display surface, e.g. using a layer having a non-uniform transparency
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0418—Constructional details
    • G09F13/0436—Signs, boards or panels attached to ceilings
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0418—Constructional details
    • G09F13/0445—Frames
    • G09F13/0448—Frames double face
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0418—Constructional details
    • G09F13/049—Edge illuminated signs, boards or panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0418—Constructional details
    • G09F2013/05—Constructional details indicating exit way or orientation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/18—Edge-illuminated signs
    • G09F2013/1804—Achieving homogeneous illumination
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/18—Edge-illuminated signs
    • G09F2013/184—Information to display

Definitions

  • the present invention relates to an escape sign luminaire, which has a plate-shaped light-guiding element, via which an escape route symbol is illuminated over a large area.
  • escape sign luminaires There are various types of escape sign luminaires, with modern and durable escape sign luminaires usually having an external light guide and usually at least one escape sign or safety sign with a pictogram displayed on it, for example an escape route direction, is attached to the flat sides of this light guide.
  • the external light guide is exposed to the influences of the environment, and thus also the pictogram, which is attached to the flat sides of the light guide.
  • the chemical resistance of an escape sign luminaire has usually been achieved by manufacturing the luminaire for the respective application from a material that has the desired chemical resistance. This can be realized in a simple manner by means of different plastics.
  • the greater challenge is presented by surfaces printed with pictograms, such as those used in escape sign luminaires.
  • pictograms such as those used in escape sign luminaires.
  • the escape signs are used in the form of a printed film in a transparent housing part of a lamp, which together with another housing part of the lamp forms a closed space that seals tightly to the outside. In this way, the printed surface can be protected from both chemical and mechanical external influences.
  • an additional component is required in order to achieve the required chemical and mechanical resistance, and the manufacturing process of such an escape sign luminaire is complex, since the film printed with the escape route symbol has to be inserted into the multi-part housing.
  • the invention is based on the object of specifying an escape sign luminaire which has a high level of chemical and mechanical resistance, similar to a moisture-proof luminaire, for example, without using an additional housing part that is necessary for this purpose, with the production process being simplified.
  • an escape sign luminaire which has a plate-shaped light-guiding element and lighting means which are arranged on a narrow side of the light-guiding element which forms a light coupling side of the light-guiding element.
  • the light guide element is designed to emit the light emitted by the lamps and radiated in via the light coupling side via at least one flat side arranged essentially perpendicularly to the light coupling side, with an escape route symbol being provided on the flat side of the light guide element intended for light emission.
  • the escape route symbol is applied, preferably printed, to a pictogram foil, which is attached to the light guide element in a frame-like manner with its surface containing the escape route symbol facing the light guide element in such a way that the escape route symbol is sealed between the pictogram foil and the light guide element.
  • the escape sign luminaire created in this way has both the desired chemical and the required mechanical resistance to environmental influences, with a corresponding separate component provided for this purpose being able to be dispensed with.
  • This is possible due to the corresponding frame-like attachment of the pictogram film to the light-guiding element, since the escape route symbol, which is applied to the surface of the pictogram film that faces the light-guiding element, is sealed between the pictogram film and the light-guiding element.
  • the escape route symbol applied to the pictogram film is shielded from the environment on one side by the pictogram film itself and on the other side by the light guide element to which the pictogram film is attached like a frame.
  • the pictogram film is attached to the light-guiding element like a frame in such a way that the escape route symbol is sealed between the pictogram film and the light-guiding element, so that the escape route symbol is completely protected from chemical and mechanical influences on all sides environment is protected.
  • the frame-like attachment of the pictogram film to the light-guiding element simplifies the production of an escape sign light according to the invention, since no additional component is required for the chemical and mechanical resistance of the escape sign light, and therefore only the work step of frame-like attachment of the pictogram film to the light-guiding element provides adequate protection from the outside influences can be achieved.
  • the pictogram film be attached to the light guide element in a sealed manner in a frame-like manner by means of a welding process.
  • a welding process e.g., laser welding, friction welding or ultrasonic welding are possible here, but other welding methods are also conceivable.
  • the materials of the pictogram film and the light-guiding element are fused together, so that the two components merge directly into one another in the connection area.
  • the pictogram foil and/or the light guide element consist of PMMA. Due to the use of polymethyl methacrylate as the material for the pictogram foil and/or the light guide element, the chemical and mechanical resistance of the escape sign luminaire to external influences can be increased. The use of other materials such as PC and/or PA12 would also be conceivable, provided they have the required resistance.
  • the light guide element has light decoupling structures, such as scattering or prism structures, on the flat side provided for light decoupling. In this way, the uniform and effective emission of light can be improved over the entire flat side of the light-guiding element provided for light extraction.
  • light decoupling structures such as scattering or prism structures
  • the surface of the pictogram film is printed using digital printing. This is a technically proven and consistent method of attaching the escape route symbol to the pictogram foil.
  • a micro-gap is formed between the pictogram film and the light-guiding element, so that no flat Adhesion of the pictogram film to the light-conducting element occurs, except in the area of the frame-like attachment.
  • the microgap has a maximum thickness of 1mm, preferably it is thinner than 0.1mm and is therefore not visible to the naked eye.
  • the microgap is produced by the roughness on the surface(s) of the light-guiding element and the pictogram film that face one another.
  • the pictogram film rests at most on the roughness points of the light-guiding element at certain points, as a result of which the micro-gap is produced.
  • Such a micro-gap between the pictogram foil and the light-guiding element allows a homogeneous decoupling of the light to be optimized even with a small thickness of the light-guiding element.
  • the microgap between the pictogram foil and the light-guiding element prevents the light from being coupled out too quickly locally in the vicinity of the coupling-in area, i.e. the area of the light-guiding element facing the lamps, and thus an uneven brightness of the flat side of the light-guiding element intended for light emission.
  • the light guide element can have a smaller thickness in contrast to previous light guides of escape sign lights, whereby a material-optimized design of the light guide element with a thickness of less than 10 mm, particularly preferably with a thickness of 4 mm, can be achieved.
  • the microgap is formed by the frame-like attachment of the pictogram film to the light-guiding element.
  • the light guide element has a polygonal shape, in particular a rectangular shape.
  • the fencing guide element can be adapted to the shape of the escape route symbol.
  • the concept according to the invention can be applied to any shape for the wicker element.
  • the wicker element is arranged on a base trough used as a housing, which is designed to accommodate the dampening solution and possibly electrical and/or electronic components for operating the dampening solution.
  • the dampening solution and possibly the electrical and/or electronic components for operating the dampening solution are also protected from external influences and the chemical and mechanical resistance of the escape sign luminaire is improved.
  • the base tub has attachment areas for mounting on a support element, such as a ceiling. This ensures a safe and effective installation of the humidity at a suitable location. Provision can be made for mirror symmetry on both sides of the
  • a pictogram film is arranged on each of the two flat sides of the fichtleitlement, the fichtleitelement being designed in this case to emit ficht over both flat sides.
  • the escape sign luminaire can be used on both sides and thus a better possibility of adapting to the given circumstances can be achieved.
  • a variant in which ficht is only released via one side of the flint guide element would of course also be conceivable.
  • FIG. 1 shows a perspective view of a first exemplary embodiment of an escape sign luminaire according to the invention
  • FIG. 2 shows a perspective view of the first exemplary embodiment of an escape sign luminaire according to the invention, with the pictogram foil not yet being fastened to the fencing guide element like a frame;
  • FIG. 3 shows a side sectional illustration of the first exemplary embodiment of an escape sign luminaire according to the invention
  • FIG. 4 shows an enlarged area of the representation from FIG.
  • FIG. 5 shows a lateral schematic sectional illustration of a second exemplary embodiment of an escape sign luminaire according to the invention.
  • Figure 6 shows an enlarged portion of the representation of Figure 5, wherein the
  • the escape sign luminaire 1 according to the invention shown in FIGS. 1 to 4 has a plate-shaped light-guiding element 2 and lighting means 3 which are arranged on a narrow side of the light-guiding element 2 which forms a light coupling side 23 of the light-guiding element 2 .
  • the lighting means 3 can be formed, for example, by an elongated LED board, on which LEDs are arranged in such a way that the light emitted by the LEDs is coupled into the light-guiding element 2 as uniformly as possible over the entire length of the light-coupling side 23 of the light-guiding element 2.
  • the light-guiding element 2 can have special light-coupling structures facing the light sources—for example, lens-like light-coupling structures—through which the efficiency of the coupling and the uniform distribution of the light is optimized.
  • the light-guiding element 2 is designed in such a way that the light coupled in via the light-coupling side 23 is distributed homogeneously within the light-guiding element 2 in a known manner by means of total reflections, so that a uniform light density is achieved over the entire height. It is provided here that the light is coupled out via at least one flat side 21 of the light-guiding element 2 arranged essentially perpendicularly to the light coupling-in side 23, so that light is radiated flat and homogeneously via this flat side 21 of the light-guiding element 2.
  • An escape route symbol 6 is provided on the flat side 21 of the light-guiding element 2 intended for light emission, with the escape route symbol 6 being applied to a pictogram foil 4, which is attached with its surface having the escape route symbol facing the light-guiding element 2, so that the light emission via the flat side 21 of the light guide element 2 the escape route symbol is illuminated and can be recognized by an observer who looks at the escape sign luminaire 1 from the outside.
  • the pictogram film 4 is not flat on the light-guiding element 2 but instead is fastened to the light-guiding element 2 like a frame in such a way that the escape route symbol 6 is sealed between the pictogram film 4 and the light-guiding element 2 .
  • the ligure 1 shows a perspective view of a first exemplary embodiment of an escape sign luminaire 1 according to the invention designed in this way.
  • the ligures 2 and 3 show the same
  • Escape sign luminaire 1 wherein the pictogram film 4 is not yet attached to the light guide element 2 in Ligur 2 and Ligur 3 is a sectional view of the Escape sign luminaire 1 with an enlarged area A shown in FIG.
  • the escape sign luminaire 1 according to the invention is shown here in accordance with the mode of operation described above.
  • the pictogram film 4 is applied to a flat side 21 of the light-guiding element 2, the flat side 21 being designed to emit light and the pictogram film 4 being fastened to the light-guiding element 2 like a frame.
  • An escape route symbol 6 is provided on the pictogram film 4 in such a way that the escape route symbol 6 is printed on the surface of the pictogram film 4 facing the light-guiding element 2 and the escape route symbol 6 is thus accommodated between the pictogram film 4 and the light-guiding element 2.
  • the pictogram film 4 is completely circumferential at its edge area and is thus fastened to the light guide element 2 like a frame in such a way that the central area of the pictogram film 4, which is provided with the escape route symbol 6, is not connected to the light guide element 2, but is nevertheless completely enclosed and sealed and thus the printed escape route symbol 6 is protected from external influences.
  • Such a sealed attachment of the pictogram film 4 to the light guide element 2 is preferably achieved by means of laser welding on the peripheral area of the pictogram film 4, but attachment by means of gluing, laminating or embossing is also possible.
  • preferred welding for example, laser welding, friction welding or ultrasonic welding can be used, but other welding methods are also fundamentally conceivable.
  • the materials of the pictogram film and the light guide element are fused together, so that both components merge directly into one another in the connection area.
  • the connection cannot be distinguished from other types of connection with the naked eye; at best, a difference could still be seen under the microscope, for example between the welding process and an adhesive process.
  • the light guide element 2 and/or the pictogram film 4 are made of suitable plastics such as PC, PA12 or PMMA, preferably both the light guide element 2 and the pictogram film 4 are made of PMMA
  • FIG. 2 shows the lamp 1 in a state in which the pictogram film 4, on which the escape route symbol 6 is applied, is not yet attached to the light guide element 2.
  • the pictogram film 4 is preferably transparent, so that the escape route symbol 6, which is printed on the surface 41 of the pictogram film 4 facing the light guide element 2, is visible from the side opposite this surface 41, in particular when the escape sign luminaire 1 is in operation.
  • the escape route symbol 6 is designed as a completely colored area, so that areas which are usually transparent in an escape route symbol 6, such as the escape route arrow, are not transparent but of course translucent. Printing the pictogram film 4 with white color is particularly suitable for these areas. Overall, therefore, the pictogram film 4 has no transparent areas in the area in which the escape route symbol 6 was applied.
  • FIG. 3 which shows a sectional illustration of the lamp 1
  • the light coupling side 23 arranged perpendicular to the flat side 21 can be seen in particular.
  • the light coupling-in side 23 of the light-guiding element 2 is designed, as already mentioned, to couple the light emitted by the lighting means 3, which are also shown in FIG.
  • the light-guiding element is designed to emit the light coupled in through the light coupling-in side 23 via the flat side 21 arranged essentially perpendicular to the light coupling-in side 23 .
  • Figure 1 also shows a base trough 5, which serves as a luminaire housing and on which the light guide element 2 is arranged, with the base trough 5 also for accommodating or holding the lamps 3 and, if necessary, electrical and/or electronic components for operating the lamps 3 , So for example an LED converter is used.
  • the light-guiding element 2 is arranged with its light-coupling side 23 on the base trough 5 in such a way that the The light emitted by the light sources 3 is coupled into the light guide element 2 through the light coupling side 23 .
  • the base trough 5 also has fastening areas 51 on the outwardly oriented surface of the base trough 5 opposite the light guide element 2 for mounting on a carrier element, such as a ceiling.
  • the arrangement of the pictogram film 4 on the flat side 21 of the light guide element 2 can be seen in area A in FIG. 3, which is shown enlarged in FIG.
  • the pictogram film 4 is only fastened like a frame, so that apart from the edge area of the pictogram film 4 no adhesions of the pictogram film 4 occur on the light-guiding element 2 and a microgap 42 is formed between the pictogram film and the light-guiding element 2.
  • the avoidance of adhesions between the two components is achieved in that one of the two or both surfaces of the light guide element 2 and the pictogram film 4 facing one another have a certain roughness.
  • the pictogram film 4 then rests, if at all, at certain points on the roughness peaks that result, as a result of which the microgap 42 is created between the two components overall or over the entire surface.
  • This is preferably less than 1 mm, particularly preferably less than 0.1 mm, and is therefore not recognizable in principle.
  • the microgap 42 promotes the homogeneous light output of the light-guiding element 2 over the entire surface of the pictogram film 4, since the properties of the total reflection of the light-guiding element 2 are significantly increased by the microgap 42.
  • a homogeneous light density in the entire light guide element 2 and therefore also a homogeneous light emission over the flat side 21 of the light guide element 2 can be achieved. Due to this micro-gap 42, unintentional decoupling of the light from the light-guiding element 2 is largely avoided and a homogeneous light density in the light-guiding element 2 is achieved.
  • the flat side 21 of the light-guiding element 2 which is covered by the pictogram film 4, has light decoupling structures 22.
  • the light decoupling structures 22 can be formed, for example, by scattering or prismatic structures, in particular also by microprism structures.
  • these light decoupling structures 22 are provided on the flat side 21 on which the pictogram film 4 is also arranged, then they can At the same time, light output structures 22 also provide the above-mentioned roughness of the surface through which the microgap 42 is formed. If, on the other hand, the light is coupled out by structures that are arranged on the opposite side of the light-guiding element 2, or with the help of scattering particles contained in the material of the light-guiding element 2, the Llachseite 21 of the light-guiding element 2 can optionally also be provided with a certain roughness.
  • the light-guiding element can be made extraordinarily thin.
  • it can have a thickness of less than 10 mm, preferably less than 4 mm.
  • the second exemplary embodiment of the escape sign luminaire 1 shown in Figures 5 and 6 is similar in its basic structure to the escape sign luminaire 1 from Figures 1 to 4, with the light guide element 2 in this second exemplary embodiment being designed in such a way that it extends over both Llachdus 21 of the light guide element 2 emits mirror-symmetrical light.
  • the region B shown enlarged in FIG. 6 represents the arrangement for decoupling the light from the light-guiding element 2 via the Llachseite 21 of the light-guiding element 2.
  • the light-guiding element 2 is designed to emit light in a mirror-symmetrical manner via both Llachstruct 21 of the light-guiding element 2 .
  • a pictogram film 4 is arranged mirror-symmetrically on each of the two Llachlitis 21 according to one of the fastening options already described.
  • the frame-like attachment of the pictogram film 4 to the light-guiding element forms a microgap 42 which improves the uniform emission of light over the flat side 21 of the light-guiding element 2 covered by the pictogram film 4 .
  • the light-guiding element 2 has light decoupling structures 22 in the region of the flat sides 21 covered by the pictogram foils 4 , as in the previous exemplary embodiment.
  • the escape sign luminaire 1 constructed in this way is therefore particularly resistant to external influences, both in terms of its chemical and mechanical resistance.
  • the escape route symbol 6 is sealed off by the pictogram film 4 and the light guide element 2 and protected against chemical and mechanical damage from the outside, and a particularly durable and resistant escape sign luminaire 1 is thus achieved.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

L'invention concerne un dispositif d'éclairage de sortie de secours (1) qui comprend : - un élément plan de guidage de lumière (2) et - des moyens d'éclairage (3) disposés sur un côté étroit de l'élément de guidage de lumière (2) qui forme un côté de couplage d'entrée de lumière (23) de l'élément de guidage de lumière (2). L'élément de guidage de lumière (2) est conçu pour émettre la lumière produite par les moyens d'éclairage (3) et rayonnée par l'intermédiaire du côté de couplage d'entrée de lumière (23) par l'intermédiaire d'au moins un côté plat (21) disposé de façon sensiblement perpendiculaire au côté de couplage d'entrée de lumière (23), et un symbole de trajet de sortie (6) est disposé sur le côté plat (21) de l'élément de guidage de lumière servant à émettre de la lumière, et le symbole de trajet de sortie (6) étant appliqué, de préférence par impression, sur un film de pictogramme (4) qui est fixé à l'élément de guidage de lumière (2) de manière à ce que sa surface contenant le symbole de trajet de sortie (6) fasse face à l'élément de guidage de lumière (2) et qui est fixé de telle sorte que le symbole de trajet de sortie (6) est scellé entre le film de pictogramme (4) et l'élément de guidage de lumière (2).
EP22738382.5A 2021-06-28 2022-06-22 Dispositif d'éclairage de sortie de secours pourvu d'un élément de guidage de lumière Pending EP4364127A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202021103432.7U DE202021103432U1 (de) 2021-06-28 2021-06-28 Rettungszeichenleuchte mit Lichtleitelement
PCT/EP2022/066973 WO2023274799A1 (fr) 2021-06-28 2022-06-22 Dispositif d'éclairage de sortie de secours pourvu d'un élément de guidage de lumière

Publications (1)

Publication Number Publication Date
EP4364127A1 true EP4364127A1 (fr) 2024-05-08

Family

ID=82446644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22738382.5A Pending EP4364127A1 (fr) 2021-06-28 2022-06-22 Dispositif d'éclairage de sortie de secours pourvu d'un élément de guidage de lumière

Country Status (3)

Country Link
EP (1) EP4364127A1 (fr)
DE (1) DE202021103432U1 (fr)
WO (1) WO2023274799A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20114561U1 (de) 2001-09-04 2003-01-23 Ceag Sicherheitstechnik Gmbh Scheibenleuchte
DE202008014775U1 (de) 2008-11-06 2009-01-29 Ceag Notlichtsysteme Gmbh Sicherheits- oder Rettungszeichenleuchte
US8046943B2 (en) * 2009-11-23 2011-11-01 Kay Ronald J Safety kick plate device and manufacturing methods
US20110219648A1 (en) * 2010-03-12 2011-09-15 Trevor James Led edge-lit signage utilizing digital print technology
DE202012008800U1 (de) * 2012-09-13 2012-10-29 Ceag Notlichtsysteme Gmbh Leuchte
DE102014203036A1 (de) 2014-02-19 2015-08-20 Ceag Notlichtsysteme Gmbh Leuchte

Also Published As

Publication number Publication date
WO2023274799A1 (fr) 2023-01-05
DE202021103432U1 (de) 2022-09-29

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