EP3470613A1 - Lamella, solar shading device, multiple glazing glass sheet, facade element and method for producing a lamella and use of a retroreflective coating on a lamella - Google Patents

Abstract

To improve the reflective properties of slats and shading devices such as venetian blinds, inter alia, the slat (1) is proposed. This has a retroreflective layer (4) on at least one side 3, so that light incident on the retroreflecting layer (4) is retroreflected at least in a certain angular range, irrespective of the orientation of the lamella (1) to a light source

Description

The invention relates to a lamella for a shading device, in particular for a Venetian blind, a shading device, a multi-pane glass, a facade element, a method for producing a lamella and a use of a retroreflective layer on a lamella.

Such slats and shading devices, in particular venetian blinds are known from the prior art and practice in different embodiments. Shading devices such as venetian blinds serve, for example, to prevent direct irradiation of high-energy sunlight through a pane into a room, without, however, completely preventing the passage of scattered light through the pane and sealing it in a non-transparent manner.

Visibility, sun protection and glare protection on and around buildings is a central factor for life and health Quality of work in buildings. With the previously known Venetian blinds are the wishes for as much daylight and visual contact to the outside, a glare-free workplace with air and surface temperatures in the comfort zone and a minimal effort for heating and air conditioning to meet hardly.

Direct sunlight into the room can cause unwanted heating of the room. The entry of scattered light in the room is desirable because it contributes to the lighting of the room and thus to a good sense of space.

In order to prevent a direct irradiation of sunlight and to avoid heating of the slats, it is for example already known to use slats of highly reflective metal bands. In this case, light rays incident on the lamella are reflected by the surface of the lamellae according to the principle of angle of incidence equal to the angle of reflection.

Depending on how the fins are aligned with the sun, unwanted sunlight may be transmitted through the venetian blinds. This not only leads to a heating of the room, but also to potentially disturbing glare effects. To prevent sunlight from entering and to avoid dazzling effects due to reflections being directed into the room, it may be necessary to adjust the orientation of the slats to the changing position of the sun from time to time. This can be done manually or automatically by a controller and is associated with a certain effort.

Depending on the position of the sun, it may even be necessary to bring the lamellae into an almost completely closed position in order to prevent a direct irradiation of sunlight. This with the side effect that then no stray light can be entered in the room.

The object of the invention is therefore to provide a lamella, a shading device, a multiple glass pane, a facade element and a method for producing a lamella and a use of the type mentioned, which improve the performance characteristics and in particular the reflection properties of fins and shading devices equipped therewith.

This object is achieved with a lamella of the type mentioned, which has the means and features of independent, directed to such a lamella claim. To achieve the object, in particular a lamella for a shading device is proposed, which has a retroreflective layer on at least one side. The retroreflective layer may be applied to a main body of the lamella. The retroreflective layer on at least one side of the lamella makes it possible to reflect light beams which impinge on a point of the layer on the at least one side of the lamella at different angles of incidence against their direction of irradiation from the lamella. This results in the lamella having retroreflective properties due to the retroreflective layer within a certain angular range, which may be comparatively large.

The at least one side of the lamella on which the retroreflective layer is arranged or applied, may be, for example, a, in particular curved, top of the lamella. It can be advantageous if the retroreflective layer completely covers the at least one side of the lamella.

As a result, sunlight striking the lamella can largely be reflected back into the direction of the sun, regardless of the position of the sun changing during the course of the day, even if the lamella is still aligned with the aid of the retroreflecting layer. An irradiation of sunlight, which is reflected at the lamella and reflected in a shaded with the lamella space can be avoided. As the retroreflective layer retroreflected by the retroreflective layer is largely reflected back toward the sun - or generally speaking back towards the radiation source - unwanted irradiation of reflected light to other buildings or parts of buildings using the blade according to the invention can be avoided. In the lamellae known hitherto, there is the risk of hitting other buildings, parts of buildings or even persons, in particular road users, with the light reflected by the lamella, and possibly dazzling it.

Overall, a lamella is created with the blade according to the invention, which is more tolerant with respect to the angular position between a radiation source, for example, the sun, and the lamella than previously known slats. In addition, due to the retroreflective layer, the lamella can tolerate or take into account different or changing azimuth angles of the sun better than lamellae known from practice to date, without losing their effect.

The lamella according to the invention makes it possible to retroreflect the light striking the lamella, even when it is changing Sun position without changing the orientation of the slat would be required. This effect can occur in a large Einstrahlwinkelbereich. Compared to previously known slats, the orientation of the slat according to the invention must therefore be adapted less frequently or not at all to the position of the sun in order to prevent unwanted irradiation of light by a shading device equipped with the slat, in particular by a venetian blind.

The blade provided with such a retroreflective layer also has the advantage that it can be produced on conventional machines and also processed. Elaborate folding and / or embossing of the blade, as they are known in practice in part, to influence the reflection properties of the previous slats, can be avoided. Such pleats and / or embossments of the sipe may cause difficulties in processing the sipes and in producing the sipe louvers equipped with such sipes. These disadvantages can be avoided with the blade according to the invention. This is especially true if the retroreflective layer has a layer thickness that is only a few millimeters or even less than one millimeter, that is, for example, in the micrometer range.

Shading devices for which the blade according to the invention is suitable, for example, venetian blinds or slatted curtains.

The retroreflective layer may include or contain retroreflective elements or consist of such retroreflective elements. The retroreflective elements can be made of a transparent Material, for example made of glass or plastic.

It can be advantageous if the retroreflective layer comprises a carrier material layer in which the retroreflective elements are embedded. As a material for the substrate layer, for example, paint, paint and / or film can be used. As a carrier material, it is also possible first of all to use liquid plastic which, after application, cures to the at least one side of the lamella and then, together with the retroreflective elements, forms the retroreflective layer on the at least one side of the lamella.

It can be advantageous if the retroreflective layer is a retroreflective lacquer layer. In this case, so-called retroreflective varnish can be used, which is applied to the at least one side, in particular of a base body, of the lamella and forms the retroreflecting layer there. Alternatively, a reflective color layer, for example of retroreflective color, can be applied to the at least one side of the lamella. Further, the retroreflective layer may be formed from a retroreflective sheeting. For example, the retroreflective sheeting may be adhered to and / or laminated to the at least one side of the sipe.

When using a retroreflective lacquer layer as a retroreflective layer, the retroreflective elements can be arranged or contained in or on the lacquer. When using a retroreflective ink layer as a retroreflective layer, the retroreflective elements may be contained or disposed in or on the ink. The retroreflective elements can then comparatively simple and uncomplicated in applying the Color or the paint get into their position of use on the at least one side of the lamella.

A retroreflective sheeting as a retroreflective layer on the at least one side of the lamella is characterized by its ease of handling. Here retroreflective elements may be included in the retroreflective sheeting. The film then acts as a carrier material for the retroreflective elements. The retroreflective sheeting can be tailored according to the dimensions of the side of the lamella to be coated, in particular cut to size, and then glued or laminated onto the at least one side of the lamella.

In a variant, the retroreflective layer can also consist of retroreflective elements. Then no carrier material such as paint, paint or foil is used, in which the retroreflective elements are embedded.

As previously stated, the retroreflective elements may preferably be made of a transparent material. The most suitable materials are glass and plastic. Advantageously, the retroreflective elements may be isotropic with respect to their retroreflective properties. Thus, the retroreflective elements are therefore retroreflective regardless of their orientation. This can be advantageous since the retroreflective elements can then be arranged particularly easily and without regard to their orientation in or on or on the layer. Regardless of their orientation, the retroreflective elements can then develop their retroreflective properties due to their isotropic nature.

It can also be particularly advantageous if the retroreflective elements consist of a transparent material, for example of glass and / or plastic, whose refractive index is isotropic. Such isotropic material has a computational index that is independent of the location or orientation of the retroreflective element to a radiation source. In this way, regardless of their position in, on or on the layer, the retroreflective bodies can exhibit their retroreflective effect. This too can simplify manufacture of the lamella, in particular application of the layer.

The retroreflective elements may be retroreflective bodies, which are preferably made of a transparent material, such as glass. For example, retroreflective bodies in the form of spheres, beads and / or prisms can be used. Particularly preferred as prisms tetrahedral prisms can be used.

The retroreflective layer on the at least one side of the lamella may be particularly thin if the retroreflective elements are retroreflective microbodies, in particular spheres, beads and / or prisms, preferably tetrahedral prisms. In the context of the invention, microelements may be understood to be those retroreflective elements in which a dimension relevant to their retroreflective properties is smaller than one millimeter, that is to say in the micrometer range. For example, in a retroreflective element that is in the form of a spherical microbody, a relevant dimension may be the diameter of the spherical microbody. This diameter of the spherical and retroreflective microbody may then be less than one millimeter. Particularly preferred, for example, glass beads or glass beads as Retroflexionskörper be used, which have a diameter which is smaller than 0.3 millimeters.

To achieve the aforementioned object, a shading device with at least one blade according to one of claims 1 to 5 is proposed. Preferably, the shading device is designed as a venetian blind.

It may be particularly advantageous if the at least one lamella is pivotable or rotatable about its longitudinal axis. For this purpose, the at least one lamella can be arranged to be pivotable or rotatable, for example, on a carrier element of the shading device.

To achieve the object, a multi-pane glass with the means and features of the directed to a multiple glass pane independent claim is proposed. In particular, to solve the problem in a multiple glass pane having at least two panes, between which a space between the panes is arranged, proposed that in the space between the panes a shading device, in particular a venetian blind, according to one of claims 6 or 7 is arranged, the at least one lamella after a of claims 1 to 5. When the fins are located in the space between the panes, the retroreflective layer is well protected from damage and contamination so that it can permanently maintain its retroreflective performance.

Particularly preferably, the multiple glass pane can be designed as an insulating glass pane. Such multiple glass panes may also be referred to as laminated glass panes. To align the slats in the To allow space between panes, the slats of the shading device, in particular the venetian blind, can be arranged rotatably or pivotably on an element, in particular on a frame or spacer frame, the multi-pane glass or on a carrier element of the shading device, in particular the Venetian blind.

To achieve the object, a facade element, in particular a composite façade element is proposed, which has the means and features of the directed on a facade element independent claim. In particular, a façade element with at least two panes is proposed to solve the problem thus having a disc space arranged between the panes or formed in which a shading device, in particular a Venetian blind according to one of claims 6 or 7 is arranged, the at least one lamella after a of claims 1 to 5.

In order to allow alignment of the slats in the space between the panes, the slats of the shading device, in particular the venetian blind, rotatable or pivotable on an element, in particular on a frame or spacer frame, the composite facade element or on a support member of the shading device, in particular the venetian blind arranged his.

To achieve the object mentioned above, a method for producing a lamella, in particular a lamella according to one of claims 1 to 5 is proposed, in which at least one side, in particular of a base body, the lamella is provided with a retroreflective layer.

In this case, this side of the lamella can be coated with the retroreflective layer. The side to which the retroreflective layer is applied may be a, preferably curved, top of the lamella. For this purpose, the retroreflective layer can be applied to a main body of the lamella and cover there at least partially or preferably over the entire surface of at least one side of the lamella.

In one embodiment of the method, retroreflective elements may be applied to the at least one side as a retroreflective layer. As a retroreflective layer but can also be a carrier material layer, preferably embedded therein, retroreflective applied to the at least one side.

It may be particularly advantageous if a retroreflective lacquer layer, a retroreflective ink layer or a retroreflective sheeting with preferably retroreflective elements located therein is applied to the at least one side of the fin as a retroreflective layer. For example, the retroreflective lacquer layer and the retroreflective colored layer can be brushed, brushed, sprayed or even poured on. Also, the order by immersing the blade in a corresponding paint or dye bath is possible.

Particularly simply, the retroreflective layer can be applied in the form of a retroreflective sheeting on the at least one side of the lamella. The retroreflective sheeting may be adhered and / or laminated to the at least one side, for example.

In the embodiments of the method described above, the paint, the paint and / or the film can each serve as a carrier material, in which the retroreflective elements are embedded in the position of use.

But it is also possible that retroreflective elements are applied as a retroreflective layer on the at least one side of the blade. This can optionally be done without a carrier material such as paint, paint or foil.

Furthermore, the use of a retroreflective layer on at least one side of a lamella is also proposed for achieving the object. In this case, the retroreflective layer may comprise retroreflective elements made of a transparent material, in particular of glass and / or plastic. The properties which the retroreflective elements may have are described in detail above.

The retroreflective layer used may be a substrate layer having retroreflective elements embedded therein.

As previously stated, a retroreflective lacquer layer, a retroreflective ink layer and / or a retroreflective sheeting may be used as the layer. But it is also possible that the retroreflective layer consists of such retroreflective elements.

In the context of the invention, retroreflection can be understood to mean the reflection of a radiation incident on a surface, which largely independent of the orientation of the surface to the radiation source and largely in the direction back to the radiation source.

Fig. 1

eine Seitenansicht einer erfindungsgemäßen Lamelle, mit einer auf einer Seite der Lamelle, nämlich ihrer gewölbten Oberseite, aufgebrachten retroreflektierenden Schicht, auf die Licht unter einem ersten Winkel einfällt und von dieser retroreflektiert wird,

Fig. 2

eine stark schematisierte Darstellung eines kugelförmigen Retroreflexionselements, das in der retroreflektierenden Schicht der in Figur 1 dargestellten Lamelle enthalten ist, zur Veranschaulichung des sich innerhalb des Retroreflexionselements ausbildenden Strahlengangs,

Fig. 3

die in Figur 1 dargestellte Lamelle, wobei in dieser Darstellung die retroreflektierende Schicht der Lamelle unter einem im Vergleich zu Figur 1 anderen Winkel mit Licht bestrahlt wird und auch hier Retroreflexion auftritt,

Fig. 4

eine weitere Darstellung des bereits in Figur 2 dargestellten Retroreflexionselements, wobei auch hier ein Strahlengang innerhalb des Retroreflexionselements zur Veranschaulichung der Retroreflexion dargestellt ist,

Fig. 5

eine stark schematisierte, perspektivische Darstellung einer Mehrfachglasscheibe mit einer als Lamellenjalousie ausgebildeten Verschattungsvorrichtung, die in einem Scheibenzwischenraum der Mehrfachglasscheibe angeordnet ist und deren Lamellen solche Lamellen sind, wie sie in den Figuren 1 und 3 dargestellt sind, sowie

Fig. 6

eine weitere perspektivische Darstellung der in Figur 5 dargestellten Mehrfachglasscheibe, mit einem Kopfkasten zur Aufnahme der Lamellenjalousie.

The invention will now be described in more detail with reference to embodiments, but is not limited to these embodiments. It shows in a highly schematic representation:

Fig. 1

a side view of a blade according to the invention, with a on one side of the lamella, namely its curved top, applied retroreflective layer, incident on the light at a first angle and is retroreflected by this,

Fig. 2

a highly schematic representation of a spherical retroreflective element, which in the retroreflective layer of in FIG. 1 is shown, for illustrating the forming within the retroreflective element beam path,

Fig. 3

in the FIG. 1 in this illustration, the retroreflective layer of the blade under a comparison with FIG. 1 other angle is irradiated with light and also here retroreflection occurs,

Fig. 4

another illustration of the already in FIG. 2 illustrated retroreflective element, wherein here also a beam path is shown within the retroreflective element to illustrate the retroreflection,

Fig. 5

a highly schematic, perspective view of a multiple glass pane with a Venetian blind formed shading device, which is arranged in a space between the panes of the multi-pane glass and the lamellae are such lamellae as in the FIGS. 1 and 3 are shown, as well

Fig. 6

a further perspective view of the multiple glass pane shown in Figure 5, with a head box for receiving the Venetian blind.

The FIGS. 1 and 3 and FIGS. 5 and 6 show lamellae designated as a whole by 1 for a shade device designed as a louvered blind 2. The lamellae 1 shown in the figures are provided on at least one side 3, here on their curved top 3, with a retroreflective layer 4. The layer 4 is applied to a main body la of the blade 1 and covers the side 3 of the blade 1 at least partially, in the present case even completely.

The retroreflective layer 4 has the effect that light rays which are emitted at different angles of incidence (cf. Fig. 1 to 4 ) impinge on a point of the layer 4, are retroreflected contrary to their direction of irradiation. In this way, light incident on the lamella 1 can be retroreflected largely independently of the orientation of the lamella 1 to the light source in the direction of the light source.

The retroreflective layer 4 may be a retroreflective resist layer, a retroreflective ink layer, and / or a retroreflective sheeting.

The retroreflective layer 4 includes a plurality of retroreflective elements 5, one of which is in the FIGS. 2 and 4 is shown very schematically. The retroreflective elements 5 are made of a transparent material. Preferably, transparent glass is used here. In one embodiment, the layer 4 comprises a carrier material in which the retroreflective elements 5 are embedded. The carrier material may be, for example, paint, paint, foil or, initially, liquid and hardening plastic by order.

The in the FIGS. 2 and 4 Due to their geometry, retroreflective elements 5 are isotropic with regard to their reflection property. Thus, they have no preferred direction in which they have to be aligned or oriented in or on the layer 4 in order to develop their retroreflective properties. Furthermore, the retroreflective elements 5 are made of a transparent material, here made of a glass whose refractive index is isotropic. Thus, the material, here the glass, from which the retroreflective elements 5 each consist, has a non-directional and direction-independent refractive index. Regardless of the orientation of the retroreflective elements 5 in, on or on the layer 4 so the refractive index of the material is always the same.

The FIGS. 2 and 4 further clarify that the retroreflective elements 5 are retroreflective bodies. The retroreflective bodies have a spherical shape and can therefore be referred to as spheres or as beads. However, it is also possible to use retroreflective bodies which have a prismatic geometry. Tetrahedral prisms may be particularly suitable as retroreflective elements 5.

The retroreflective elements 5 are present as retroreflective microbodies because of their dimensions in the micrometer range. In the in the FIGS. 2 and 4 In the embodiment shown, these are retroreflective bodies which have a dimension relevant to retroreflection, which is smaller than one millimeter and lies in the micrometer range.

The in the FIGS. 1 and 3 shown slats 1 are used on a Venetian blind 2, as for example in the FIGS. 5 and 6 are shown. The slats are 1 in the FIGS. 5 and 6 shown Venetian blinds 2 each pivotable about its longitudinal axis or rotatably arranged. This in order to change the orientation of the slats 1 in the venetian blind 2, if necessary. For this purpose, the slats 1 can be arranged pivotably or rotatably on a support element of the slatted blind 2 or else on a support element of a multiple glass pane 6 or a facade element, in particular on a composite facade element.

The FIGS. 5 and 6 now show a multiple glass pane 6, which can also be used as a facade element or composite facade element. The in the FIGS. 5 and 6 shown multiple glass pane 6 has a total of two panes 7 and arranged between the panes 7 disc space 8. In the space between the panes 8, the Venetian blind 2 is arranged with the slats 1. According to FIG. 6 the multi-pane glass 6 has a head box 9 for receiving the blind 2.

For the production of the lamella 1, as in the FIGS. 1 and 3 is shown, the at least one side 3 of the lamella 1 is provided with the retroreflective layer 4. This can preferably be done over the entire surface.

As mentioned above, a retroreflective lacquer layer, a retroreflective ink layer and / or a retroreflective sheeting with retroreflective elements 5 may be applied as the retroreflective layer 4. A retroreflective sheeting may be glued or laminated to the at least one side 3. Thus, therefore, the retroreflective layer 4 is used on at least one side 3 of the lamella 1 of the venetian blind 2.

The operation of the retroreflective layer 4 will be described with reference to FIGS FIGS. 1 to 4 clear. FIG. 1 shows how a first light beam 10 impinges on the retroreflective layer 4 on the lamella 1 at a first angle. The dashed and provided with the reference numeral 11 arrow shows the reflection of the light beam 10. It is noteworthy that the reflection due to the retroreflective layer 4 on the lamella 1 takes place counter to the direction of irradiation of the light beam 10. In this case, the light beam 10 can be reflected in itself or offset to the layer 4.

Although a second light beam 12 impinges on the retroreflective layer 4 of the lamella 1 with an unchanged angle of the lamella 1 at a different angle of incidence than the first light beam 10, a retroreflection of the light beam 12 also occurs here on the retroreflective layer 4 of the lamella 1. Thus, the light beam 12 is thrown back against the irradiation direction of the light beam 12 by the retroreflective layer 4 on the side 3 of the lamella 1 via the reflected light beam 13 shown in dashed lines.

In this case, retroreflection can mean that one on the Retroreflective layer 4 incident light beam is reflected or reflected almost parallel or parallel offset to its direction of irradiation counter to its irradiation direction of the retroreflective layer 4 of the lamella 1.

The FIGS. 2 and 4 Now illustrate the beam path of the light beams 10 and 12 and the reflected light beams 11 and 13 in the spherical retroreflective elements 5, which are arranged in the layer 4 of the lamella 1. When the light beam 10 enters the retroreflective element 5, the light beam 10 is refracted. At a rear side 14 of the retroreflective element 5 facing away from the entrance of the light beam 10, total reflection occurs so that the light beam 10 in the form of the reflected light beam 11 exits the retroreflective element 5 counter to the irradiation direction of the light beam 10.

Although the light beam 12 occurs at a different angle of incidence to the retroreflective body 5 disposed within the retroreflective layer 4, retroreflection of the light beam 12 in and on the retroreflective body 5 also occurs here according to the previously described principle Retroreflexionselement 5 first broken, then totally reflected at the back 14 of the retroreflective element 5 and then exits as a dashed line shown light beam 13 opposite to the direction of irradiation of the light beam 12 from the retroreflective element 5 again. The lamella 1 has its orientation to the light source, which emits the light beams 10 and 12, not changed.

To improve the reflective properties of slats and venetian blinds, inter alia, the slat 1 is proposed. This has a retroreflective layer 4 on at least one side 3, so that light incident on the retroreflecting layer 4 is retroreflected at least in a certain angular range, independently of the orientation of the lamella 1 to a light source.

LIST OF REFERENCE NUMBERS

1

lamella

1a

Basic body of 1

2

Shading device / Venetian blind

3

Side / top of 1

4

retroreflective layer

5

Retroreflective element

6

Multiple-layer glass / facade element

7

disc

8th

Disk space

9

headbox

10

beam of light

11

reflected light beam

12

beam of light

13

reflected light beam

14

Back of 5

Claims (15)

Slat (1), in particular for a shading device (2) such as a venetian blind (2), characterized in that the slat (1) on at least one side (3) has a retroreflective layer (4). Slat (1) according to claim 1, characterized in that the retroreflective layer (4) comprises or contains retroreflective elements (5) or that the retroreflective layer (4) consists of retroreflective elements (5) and / or that the retroreflective layer (4) has a Support material layer, in particular of paint, paint and / or foil, with embedded therein retroreflective elements (5) or is such. Slat (1) according to one of claims 1 or 2, characterized in that the retroreflective layer (4) is a retroreflective lacquer layer, a retroreflective ink layer and / or a retroreflective sheeting. Slat (1) according to claim 2 or 3, characterized in that the retroreflective elements (5) consist of a transparent material, for example of glass or plastic, and / or that the retroreflective elements (5) are isotropic with respect to their retroreflective property and / or in that the retroreflective elements (5) consist of a, preferably transparent, material, in particular of glass and / or plastic whose refractive index is isotropic. Slat (1) according to one of claims 2 to 4, characterized in that the retroreflective elements (5) are retroreflective bodies, in particular spheres, beads and / or prisms, preferably tetrahedral prisms, and / or that the retroreflective elements (5) are retroreflective microbodies, in particular spheres, beads and / or prisms, preferably tetrahedral prisms. Shading device (2), in particular Venetian blind (2), with at least one lamella (1) according to one of claims 1 to 5. Shading device (2) according to claim 6, characterized in that the at least one lamella (1) about its longitudinal axis is pivotable or rotatable, in particular on a support element of the shading device (2) is arranged pivotably or rotatably. Multiple glass pane (6), in particular insulating glass pane, with at least two panes (7) and with a pane intermediate space (8) arranged between the panes (7), characterized in that a shading device (2), in particular a venetian blind (FIG. 2), according to one of claims 6 or 7 is arranged. Façade element, in particular composite façade element, with at least two panes (7), with a space between the panes arranged between the panes (8), characterized in that in the space between the panes (8) a shading device (2), in particular a Venetian blind (2), arranged according to one of claims 6 or 7. Method for producing a lamella (1), in particular a lamella (1) according to one of claims 1 to 5, wherein at least one side (3) of the lamella (1) is provided with a retroreflecting layer (4). A method according to claim 10, characterized in that retroreflective elements (5) are applied as a retroreflective layer (4) on the at least one side (3) and / or that as a retroreflective layer (4) a carrier material layer with, preferably embedded therein, retroreflective elements (5 ) is applied to the at least one side (3). A method according to claim 10 or 11, characterized in that as a retroreflective layer (4) a retroreflective lacquer layer and / or a retroreflective ink layer with, preferably located therein, retroreflective elements (5) is applied to the at least one side (3) and / or as retroreflective layer (4) a retroreflective sheeting with, preferably therein, retroreflective elements (5) is applied to the at least one side (3), in particular adhesively bonded and / or laminated. Use of a retroreflective layer (4) on at least one side (3) of a lamella (1), in particular according to one of claims 1 to 5, of a shading device (2). Use according to claim 13, characterized in that the retroreflective layer (4) retroreflective elements (5) made of a transparent material, in particular glass and / or plastic, or that the retroreflective layer (4) consists of such retroreflective elements (5). Use according to claim 13 or 14, characterized in that the retroreflective layer (4) is a substrate layer with, preferably embedded, retroreflective elements (5) and / or that the retroreflective layer (4) comprises a retroreflective lacquer layer, a retroreflective ink layer and / or a retroreflective sheeting.

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