WO2016193088A1

WO2016193088A1 - Flat illuminating device

Info

Publication number: WO2016193088A1
Application number: PCT/EP2016/061779
Authority: WO
Inventors: Thomas Hofberger
Original assignee: Thomas Hofberger GmbH
Priority date: 2015-06-05
Filing date: 2016-05-25
Publication date: 2016-12-08
Also published as: DE202015102924U1

Abstract

A flat illuminating device for illuminating facades or the interior of buildings comprises: - a light source (100) with a main propagation direction (200) of the light emitted by the light source; - a diffusor (300) which is arranged in the main propagation direction (200) of the light emitted by the light source (100) and through which said light can shine; - a first covering (400, 420) which at least covers the diffusor (300) perpendicular to the main propagation direction (200) of the light emitted by the light source (100); wherein the first covering (400, 420) comprises a layer assembly and the layer assembly comprises a substrate (500, 520), a transparent cover layer (600, 620) and a cured adhesive layer (700, 720) arranged between the substrate (500, 520) and cover layer (600, 620), wherein the adhesive layer (700, 720) at least partially contacts the substrate (500, 520) and the cover layer (600, 620), the substrate (500, 520) comprises a mineral material and the substrate (500, 520) has a thickness of ≥0.5 mm to ≤20 mm.

Description

Flat illumination device

The present invention relates to a sheet-like illumination device for illuminating facades or the interior of buildings, comprising a light source having a main propagation direction of the light emitted by the light source; a diffuser arranged in the main propagation of the light emitted by the light source and translucent by this light, and a first cover which covers at least the diffuser perpendicular to the main propagation direction of the light emitted by the light source.

Composite elements made of natural stone slabs and decorative or protective cover layers are the subject of intensive development work. This is partly due to the desire to be able to use the decorative properties of natural stone in environments that are due to the inherent properties of many natural stone materials such as porosity, presence of capillary networks or sensitivity to chemicals are not readily available.

EP 0 799 949 A1 discloses a natural stone element comprising at least one thin natural stone slab and a supporting plate connected to it over a large area, wherein the supporting slab consists of at least one glass sheet which is connected to the natural stone slab by means of a preferably transparent casting resin layer, and the natural stone elements to one another or to a carrier element are attached.

DE 10 2008 052 066 AI discloses an article comprising a disk-shaped composite material having two major surfaces and a peripheral edge surface, comprising, in the order above superimposed and adherent to each other, a first mechanically stable, transparent layer, a first transparent, tear-resistant, adhesion-promoting layer, one of volatile compounds substantially or completely free, opaque or translucent stone layer, - a second transparent, tear-resistant, adhesion-promoting layer and a second mechanically stable, transparent layer, as well as an all-round sealing of the peripheral edge surface. The process for the preparation of this article is characterized in that a translucent or opaque stone layer substantially or completely freed of volatile compounds, adheres on both sides via a transparent, tear-resistant, adhesion-promoting layer with a mechanically stable, transparent layer adherent, creating a disc-shaped , translucent composite material with two main surfaces and a peripheral edge surface results, and provides the peripheral edge surface with an all-round seal.

According to this patent application, the article is used as a decorative and / or architectural object and / or decorative and / or architectural component for the interior and exterior or for its manufacture. DE 10 2005 014 945 A1 discloses a glass-based wall cladding, in particular in the form of tiles, for cladding walls, such as walls, floors or ceilings of a living space, with a glass substrate coated with a varnish layer on a surface to be attached to the walls, said lacquer having such a low water permeability as a protective layer against corrosive attack, said cover being able to be affixed to the walls by means of ordinary, water-based mortar adhesives or cement adhesives.

During the bonding of natural stone slabs with glass cover layers, air bubbles can be introduced into the adhesive used. The main sources of such air bubbles are blending operations when using two component adhesives and filling the glue into the gap between the natural stone plate and the glass topcoat.

Air bubbles trapped in the cured adhesive layer are undesirable for two reasons. On the one hand, they introduce mechanical weaknesses in the bond. Furthermore, they disturb the aesthetic appearance of the composite article, which is not tolerated by the customer, especially in the field of high-quality interior furnishings items.

It would be desirable to have available natural stone elements as cladding, as windows or as room elements in buildings to achieve special aesthetic effects. Such elements are opaque, yet bright and have a pleasing appearance with their natural stone look. At the same time, the elements should be as large as possible and be resistant to external influences.

The object of the present invention is to provide such elements.

This object is achieved according to the invention by a layer according to claim 1. Advantageous developments of the invention are specified in the respective subclaims. They can be combined with each other as long as the opposite does not result from the context.

The planar illumination device according to the invention for illuminating facades or the interior of structures comprises: a light source having a main propagation direction of the light emitted by the light source; a diffuser arranged in the main propagation of the light emitted by the light source and translucent by this light; a first cover which covers at least the diffuser perpendicular to the main propagation direction of the light emitted by the light source; wherein the first cover has a layer composite and the layer composite comprises a substrate, a transparent cover layer and a cured adhesive layer arranged between substrate and cover layer, wherein the adhesive layer at least partially contacts the substrate and the cover layer, the substrate has a mineral material and the substrate has a thickness of> 0.5 mm to <20 mm.

By means of the lighting device according to the invention, facades, windows or the interior of buildings can be equipped with an aesthetically pleasing lighting concept. Large surfaces of a mineral material and especially of a natural stone are illuminated diffusely from their back and thus seem to emit themselves. In this case, the thickness of the mineral material can be selected to be comparatively thin, since it is mechanically stabilized by bonding to the cover layer. As will be explained below, the bonding can be performed in a high quality, thereby avoiding gas bubble inclusions.

As a planar illumination device, the device according to the invention differs from punctiform light sources such as individually inserted light bulbs or light emitting diodes. In this case, the planar illumination is achieved by a diffuser or area light distributor arranged in the main propagation direction of the light emitted by a light source. The light scattered by the diffuser shines through the cover and thus also the substrate with the mineral material.

The diffuser has a plurality of small scattering centers. If parallel light beams strike at different points of a diffuser, they are distributed in different directions and thus generate diffused light. Preferably, diffusers are used which scatter the light within its volume and not only at its surface.

The diffuser can contact the first cover directly. But it is also possible that there is a gap between diffuser and cover. Both circumstances are included according to the invention when it is mentioned that the cover covers the diffuser. It is inventively provided that the substrate has a thickness of> 0.5 mm to <20 mm having. Preferably, this thickness is> 1 mm to <5 mm, more preferably> 2 mm to <3 mm.

In the illumination device according to the invention, for example, the area of the substrate of the first cover can be from> 1 m ² to <9 m ² , preferably> 2 m ² to <8 m ² , more preferably> 3 m ² to <7 m ² .

In particular, with larger dimensions of the illumination device, it may be advantageous if more than one light source is present. For example, two opposing light sources or two pairs of opposing light sources may be present in the illumination device. The bonding of substrate (s) and cover layer (s) in a high quality with respect to the absence of air pockets and also in the case of large surfaces to be bonded can be carried out by a method comprising the following steps:

A) providing an assembly comprising a substrate and a capping layer, the substrate having a first substrate side having a vertically upper substrate edge, a lower substrate edge seen vertically, a first substrate side edge, and one of the first substrate side edges second substrate side edge; the cover layer has a first cover layer side with an upper cover layer edge seen in the vertical direction, a lower cover layer seen in the vertical direction

Cover layer edge, a first cover layer side edge and one of the first

Cover layer side edge opposite second cover layer side edge; the first substrate side and the first cover layer side in the arrangement face each other at an angle α and an angle bisector of the angle α is formed; the upper substrate edge and the upper cover layer edge in the array face each other; the lower substrate edge and the lower cover layer edge in the arrangement face each other; the first substrate side edge and the first cover layer side edge in the Arrangement facing each other; the second substrate side edge and the second cover layer side edge in the array face each other; in the arrangement, the distance of the upper substrate edge to the upper cover layer edge greater than the distance of the lower substrate edge to the lower

Cover layer edge is; in the arrangement between the lower substrate edge and the lower cover layer edge, a first seal is provided, which prevents the escape of fluids between the lower substrate edge and the lower cover layer edge; in the arrangement between the first substrate side edge and the first

Cover layer side edge, a second seal is provided which prevents the escape of fluids between the first substrate side edge and the first cover layer side edge; in the arrangement between the second substrate side edge and the second cover layer side edge, a third seal is provided, which prevents the escape of fluids between the second substrate side edge and the second cover layer side edge; so that the arrangement forms a container open on one side for receiving fluids and in this container is also an adhesive capable of curing; B) pivoting the substrate and the cover layer towards one another such that the distance of the upper substrate edge from the upper cover layer edge decreases and the adhesive is moved towards the upper substrate edge and the upper cover layer edge; wherein step B) is performed such that during at least part of step B), the bisector of the angle α with respect to the vertical occupies an angle of> -45 ° to <45 °.

It has been found that by the procedure in the process in which the approach of the substrate to be bonded and the cover layer (in simplified and exemplary terms) is upright, any air bubbles in the liquid adhesive can rise and escape from the adhesive gap. The procedure is easy to perform even for less experienced users.

After step B) in the process, further steps, such as turning of the layer composite, may occur in the horizontal, pressing, curing of the adhesive by heating or irradiation, etc. connect.

For further details of this method, reference is made to the German Utility Model DE 20 2013 105933 Ul the same applicant. The present invention will be explained in more detail with reference to the following drawings, but without being limited thereto. Show it:

FIG. 1 shows a lighting device according to the invention

FIG. 2 shows a lighting device according to the invention with dimensioning

FIG. 3 shows a further illumination device according to the invention FIG. 4 shows a further illumination device according to the invention with dimensioning

FIG. 1 shows a section of a lighting device according to the invention with a light source 100 which contains two light-emitting diodes 110, 120. The light source 100 is arranged in a frame unit 130, which can also be made interchangeable. Above and below the frame unit 130 seals may be provided. The emission characteristic of the individual light-emitting diodes 110, 120 and the light source 100 overall results in a main propagation direction 200 of the light, shown horizontally in the figure.

In the main propagation direction 200 of the light emitted from the light source 100, the diffuser 300 is mounted. It should be understood that the indication of the main propagation direction 200 in the drawing does not refer to the path of the light within the diffuser 300, but represents the main propagation direction without the influence of the diffuser 300.

The illumination device furthermore has a first cover 400, which covers the diffuser perpendicular to the direction 200. In the cover 400 is located on the side facing the diffuser 300, the substrate 500, which is preferably a natural stone slab. This substrate 500 is connected to the cover layer 600 by a cured and transparent adhesive layer 700.

The in FIG. 1 is characterized in that the illumination device furthermore has a second cover 410 which is arranged on the side of the diffuser 300 opposite the first cover 400, wherein the second cover 410 has a layer and the layers have a substrate 510, a transparent cover layer 610 and a substrate 510 and cover layer 610 arranged hardened adhesive layer 710, wherein the adhesive layer 710, the substrate 510 and the cover layer 610 at least partially contacted, the substrate 510 has a mineral material and the substrate 510 has a thickness of> 0.5 mm to <20 mm (preferably> 1 mm to <5 mm , more preferably> 2 mm to <3 mm). Due to the symmetrical structure of the lighting unit according to FIG. 1, both the first cover 400 and the second cover 420 may face outward. The cover layers 600 and 610 protect the underlying substrates 500, 510.

FIG. 2 shows the illumination device according to the invention from FIG. 1 with suggestions for a dimension in millimeters. It can be seen in particular that the substrates 500, 510 have a thickness of 2 mm.

FIG. 3 shows a section of a further illumination device according to the invention. Again, there is a light source 100, which includes two light-emitting diodes 110, 120. The light source 100 is arranged in a frame unit 130, which can also be made interchangeable. Above and below the frame unit 130 seals may be provided. The emission characteristic of the individual light-emitting diodes 110, 120 and the light source 100 overall results in a main propagation direction 200 of the light, shown horizontally in the figure.

A layer composite is present in the first cover 420, in which, inter alia, the substrate 520 is connected to the transparent cover layer 620 by means of cured adhesive layer 720. Likewise, a layer composite is present in the second cover 430, in which the substrate 530 is connected to the transparent cover layer 650 by means of hardened adhesive layer 740. It is, as shown in FIG. 3, it is possible, according to an embodiment, for the first cover 420 and / or the second cover 430 to have a further transparent cover layer 630, 640, wherein a further cured adhesive layer 730, 750 is present between the substrate 520, 530 and the further cover layer 630, 640 ,

It is, as also shown in FIG. 3, according to one embodiment, it is possible to design one (or both) covers such as an insulating glass window. Shown is how the second cover 430 has an additional transparent layer 660 that is spaced to a transparent layer 640 such that a cavity 900 is defined between these layers 640, 660. The Formation of the cavity 900 may be facilitated by a spacer 800. In the cavity 900 may be for isolation purposes, a gas such as krypton or xenon.

FIG. 4 shows the illumination device according to the invention from FIG. 3 with proposals for a dimension in millimeters. It can be seen in particular that the substrates 520, 530 have a thickness of 2 mm.

In a further embodiment of the illumination device according to the invention, as already described in connection with FIG. 1 and 3 executed, the light source 100 on LEDs. Preferably, a double-chip LED tape, for example with an electrical power of 15 to 25 W / m, is used.

In a further embodiment of the illumination device according to the invention the average content of gas bubbles is having a maximum dimension of> 100 μιη in at least one of the present in the illumination system adhesive layers 700, 710, 720, 730, 740, 750, less than 100 gas bubbles m ^2. The gas bubble content can be determined, for example, by means of optical assessment and counting of the gas bubbles. Also conceivable are automated methods which check the layer composite by means of camera and software for image processing. Gas bubbles with a maximum extent of> 100 μιη are usually no longer perceptible to the naked eye. Preferably, their average content is less than 10 gas bubbles / m ² , more preferably less than 1 gas bubbles / m ² . The lower the gas bubble content, the higher the quality of the layer composite is perceived by the end user.

In a further embodiment of the illumination device according to the invention, the material of at least one of the cover layers 600, 610, 620, 630, 640, 650, 660 present in the illumination device has a glass. The glass is preferably selected from the group consisting of E glass, S glass, M glass, quartz glass, borosilicate glass, crown glass, soda-lime glass, float glass, flint glass and / or lead crystal glass.

In a further embodiment of the illumination device according to the invention, the material of at least one of the substrate 500, 510, 520, 530 present in the illumination device has natural stone. Preferably, the natural stone is selected from the group comprising granite, marble, quartz, quartz composite, travertine, sandstone, slate and / or agate.

Claims

claims

A planar illumination device for illuminating facades or the interior of buildings, comprising: a light source (100) having a main propagation direction (200) of the light emitted from the light source; a diffuser (300) arranged in the main propagation (200) of the light emitted by the light source (100) and translucent therefrom; a first cover (400, 420) covering at least the diffuser (300) perpendicular to the main propagation direction (200) of the light emitted from the light source (100); characterized in that the first cover (400, 420) has a layer composite and the layer composite has a substrate (500, 520), a transparent cover layer (600, 620) and an intermediate layer between substrate (500, 520) and cover layer (600, 620) arranged hardened adhesive layer (700, 720), wherein the adhesive layer (700, 720) the substrate (500, 520) and the cover layer (600, 620) at least partially contacted, the substrate (500, 520) comprises a mineral material and the Substrate (500, 520) has a thickness of> 0.5 mm to <20 mm.

2. The lighting device according to claim 1, wherein the lighting device further comprises a second cover (410, 430) disposed on the first cover (400, 420) opposite side of the diffuser (300), wherein the second cover (410, 430 ) has a layer composite and the layer composite comprises a substrate (510, 530), a transparent cover layer (610, 650) and a between the substrate (510, 530) and cover layer (610, 650) arranged cured adhesive layer (710, 740) the adhesive layer (710, 740) the substrate (510, 530) and the cover layer (610, 650) at least partially contacted, the substrate (510, 530) has a mineral material and the substrate (510, 530) has a thickness of> 0.5 mm to <20 mm.

3. Lighting device according to claim 2, wherein the first cover (420) and / or the second cover (430) have a further transparent cover layer (630, 640) and wherein between the substrate (520, 530) and the further cover layer (630, 640 ) a further cured adhesive layer (730, 750) is present.

The illumination device according to claim 2 or 3, wherein the second cover (430) has an additional transparent layer (660) which is spaced from a transparent layer (640) such that a cavity (900) is formed between these layers (640, 660) ) is defined.

5. Lighting device according to one of claims 1 to 4, wherein the light source (100) comprises light-emitting diodes.

6. Lighting device according to one of claims 1 to 5, wherein the average content of gas bubbles with a maximum extent of> 100 μιη in at least one of the present in the lighting device adhesive layers (700, 710, 720, 730, 740, 750) less than 100 Gas bubbles / m ² is.

7. Lighting device according to one of claims 1 to 6, wherein the material of at least one of the present in the illumination device cover layers (600, 610, 620, 630, 640, 650, 660) comprises a glass.

8. Lighting device according to claim 7, wherein the glass is selected from the group comprising E-glass, S-glass, M-glass, quartz glass, borosilicate glass, crown glass, soda-lime glass, float glass, flint glass and / or lead crystal glass.

9. Lighting device according to one of claims 1 to 8, wherein the material of at least one of the present in the illumination device substrate (500, 510, 520, 530) comprises natural stone.

10. Lighting device according to claim 9, wherein the natural stone is selected from the group comprising granite, marble, quartz, quartz composite, travertine, sandstone, slate and / or agate.