EP2060734A2 - Anti-dazzle device - Google Patents

Abstract

The antiglare device (2) has multiple elongated light deflecting blades (3) arranged on top of each other. The light deflecting blades are designed on upper side in light reflecting manner and curved particularly concave on the upper side in the cross section. The light deflecting blades contain a blade body (6) made of a transparent material, on which a semitransparent coating with a transmission factor.

Description

The present invention relates to a glare protection device with a plurality of superimposed elongated Lichtumlenklamellen which are light-reflecting formed on their upper sides and curved in cross-section preferably concave to the top, the Lichtumlenklamellen have a perforated, having holes lamellar body.

For rooms with VDU workstations, glare protection devices in the form of venetian blinds or curtains are regularly attached to the windows in order to avoid the high window light densities or the glare resulting therefrom for working on the screen. Although conventional venetian blinds bring in their closed position a satisfactory reduction in the window luminance, but this is accompanied by a significant reduction in the amount of light brought into the room, so that artificial lighting is often necessary even during the day. In addition, the environment through the window opening is more or less imperceptible at all, which has a negative effect on the condition of persons in the room when the venetian blinds are closed for a long time.

On the one hand to allow a certain view from the room through Abblendlamellen outwards and to bring a sufficiently high amount of light into the room while maintaining the Abblendbedingungen, therefore, has already been proposed to form the Lichtumlenklamellen at least partially translucent. The EP 0 606 543 B1 proposes for this purpose to perforate the Lichtumlenklamellen in a strip-shaped section in the manner of a perforation, so that in the closed position of the slats through this still light falls through and can be at least schematically seen through. However, the visibility of the environment is limited if the dimming effect is to be sufficiently maintained. The holes of the perforation are to be kept relatively small in diameter, since enlarging the holes or increasing the proportion of holes, the glare would increase too much. On the other hand results in such a perforated Lichtumlenklamellen depending on the amount of light a dazzling effect by an undesirable scattering of sunlight on the walls of the holes.

Proceeding from this, the present invention has the object to provide an improved anti-glare device of the type mentioned above, which avoids the disadvantages of the prior art and further develops the latter in an advantageous manner. In particular, an improved visual reference should be achieved from inside to outside, without sacrificing the necessary dimming effect.

This object is achieved by a glare protection device according to claim 1. Preferred embodiments of the invention are the subject of the dependent claims.

In order to achieve a better relationship between inside and outside, it is therefore proposed to increase the overall transparent area, but to provide it with only partially permeable lamination, to too strong glare, which would be accompanied by an increase in the transparent area, too avoid. One aspect of the present invention is that the light fins have a perforated, perforated lamellar body, on which a holes-covering, partially transparent reflection film with a transmittance in the range of 2% to 50% is applied. As a result, the hole diameter can be increased in principle compared to the prior art. By covering the holes of the perforation with only a partially transparent reflection foil, the necessary dimming effect is achieved, although the visibility and the perception of the environment through the slats is improved. In this case, the unwanted glare from sunlight, which is scattered at the edges of the holes, is advantageously reduced by the reflective foil passing over the holes. At the same time, the reflection foil in the non-closed, approximately horizontally oriented position of the lamellae ensures that a very high amount of light is transported between the lamellas into the building interior by reflection, which is also supported by the covering of the holes and the larger surface of the reflective lamination becomes.

In a further development of the invention, the reflective foil may consist of a partially transparent mirror foil with a transmittance of between 5% and 25%, preferably approximately 7% to 12%. This is a very favorable compromise between sufficient dimming effect on the one hand and a good relation between inside and outside on the other.

Compared to the prior art can be provided by the lamination of the perforation, a higher hole portion, which ensures a better perception of the environment. In a preferred embodiment of the invention, the holes in the lamellar body may have an area fraction of 30% to 70%, preferably about 50%. The area ratio here means the proportion of the total area of the holes on the total area of the perforation area, so that with a hole proportion of 50%, a non-hole portion of 50% remains. If the entire lamellar surface perforated, corresponds to a hole portion or area fraction of the holes of 50% to a 50% share of the total lamellar surface. The lamellar body can do this basically be provided only partially or even over its entire surface with a perforation.

In the invention, the perforation or perforation of the light fins is not limited to a portion of the light fins, but provided substantially over the entire surface of the light fins.

The holes are advantageously arranged in a preferably regular grid, wherein it proves to be advantageous if the holes are arranged in rows parallel to the longitudinal direction of the Lichtumlenklamellen.

The diameter of the holes of the perforation can basically be chosen differently, wherein it is preferably dimensioned sufficiently large to allow a good visual relation between inside and outside. According to an advantageous embodiment of the invention, the holes may have a diameter between 0.5 mm and 10 mm, preferably about 1 to 3 mm. If the holes were chosen smaller, the relation between inside and outside would be too much cropped. On the other hand, if the holes were chosen to be larger than the range mentioned, the lamellae would become unstable overall and, above all, the reflective foil would tend to be damaged.

An advantageous embodiment of the invention can in this case be that an asymmetrical hole distribution over the surface of the disk body is provided. Holes of different sizes may be provided in different sections of the lamellar body, with smaller holes preferably being provided in the middle section of the lamellar body in the region of the longitudinal axis of the lamellar body with such a varying hole size distribution, while towards the edges of the lamellar body, in particular in edge-overlapping regions of the lamellar body , larger holes are provided. So if you look at the lamellar body transverse to its longitudinal axis, larger holes are initially provided on the one edge, then the holes are smaller towards the middle of the lamella, then finally to the opposite edge back to larger become. This unusual at first glance hole size distribution can - for the unequal hole size distribution per se - a consistent transparency can be created. On the one hand, with concave or convexly curved slats in the open position, the upwards or downwards bent edges, which in themselves would affect the view outside. On the other hand, with closed Lichtumlenklamellen, ie if they are placed substantially parallel to the window surface and overlap in the edge regions, due to the larger holes in the edge regions in the overlapped edge region the desired transparency, ie the visual reference to the outside. If the coverage areas are not completely on top of each other or slightly shifted from each other, even at an oblique angle through the larger holes results in a still sufficient hole coverage, which ensures the desired reference to the outside.

In order nevertheless to achieve a view over the entire surface of the anti-glare device at least approximately constant visual reference to the outside, even with holes of different sizes, the number of holes per area number can be adapted to the hole size accordingly. In particular, it can be provided that the number of smaller holes in the central portion of the lamellar body is greater than the number of larger holes in the edge regions per corresponding unit area, i. the hole density is increased in the areas of smaller holes.

In a further development of the invention, the number of holes per unit area can be adapted such that the holes in the edge sections with the larger holes as well as in the middle section with the smaller holes equally each have an area fraction of 30% to 70%, preferably about 50%. on the whole, having the perforation surface.

The number of holes per unit area may be adapted to the varying hole size such that, regardless of the size of the hole, the light louver approximates one Consistent hole area proportion of the entire, having the perforation lamellar surface has.

The perforated lamellar body can basically consist of different materials. For example, a lamellar body made of metal or plastic may be provided.

As an alternative to a metal body, according to a further aspect of the present invention, a lamellar body made of a transparent material can be provided, so that the lamella body as a whole is translucent surface, wherein on the lamellar body a partially transparent coating or lamination with a transmittance in the range of 2% to 50% can be applied. The said coating is perforated together with the lamellar body, in which case the aforementioned reflection foil is placed over the perforated lamellar body so as to cover the holes. Said coating of the lamellae body made of transparent material, preferably plastic, may consist of partially permeable aluminum vaporization with a transmittance in the range of 2% to 25%, preferably 2% to 10%. The Aluminiumbedampfung is advantageously provided on the upper side of the lamella and gives this a reflective effect in order to be able to direct sufficient light around the interior in the non-closed, approximately horizontal position of Lichtumlenklamellen.

The above-mentioned, the holes of the lamellar body overlapping film may in this case basically be formed differently and in particular also have different thicknesses, with respect to the thickness mentioned the term "film" is not to be understood as limiting. For example, films with a thickness in the nanoscale can be used, while on the other hand films with a thickness in the millimeter range can be provided. The film may in principle also consist of different materials and have a multilayer structure.

In a particularly advantageous embodiment of the invention, the total partially permeable Lichtumlenklamellen are formed polarizing. In this case, the lamellar body itself and / or the reflection foil applied thereon can be made polarizing.

Advantageously, the polarization of Lichtumlenklamellen is controllable, in particular switched on and off. For this purpose, in a further development of the invention, a polarization layer can be provided which unfolds or loses its polarization effect by means of systems or switching off electrical voltage. The polarization effect of the Lichtumlenklamellen can be made for indoor workstations pleasant light in the interior, while unwanted reflections and unwanted glare are effectively suppressed.

In a development of the invention, the lamellar body and / or the reflection foil applied thereon can be intelligently designed, so to speak, with respect to the heat and / or light transmission, so that an adaptation to the respective given heat and light conditions can be achieved.

In a further development of the invention, the light lamellae can be designed according to the principle of "low emissivity", so that less energy can leave the dimmed room in an energy-efficient manner than is supplied to it by the anti-glare device. In a further development of the invention, the lamellar body and / or the reflection foil applied thereto can be bidirectional with respect to heat radiation such that more shortwave radiation is transmitted from the outside into the dimmed room from the light diverter lamellae than from the anti-glare apparatus in the form of long-wave radiation from the interior to the outside is left.

In an advantageous development of the invention, the lamellar body and / or the reflection foil may be designed to be self-adjusting or self-adjusting with respect to the heat transfer and / or the light transmittance, such that upon increasing the heat and / or light exposure of the light louvre cladding Heat and / or light transmission decreases. This can be achieved, for example, by virtue of the fact that the lamellar body and / or the reflection foil have a light permeability which can be changed by application of heat. If the light fins and / or the reflection foil applied thereto are heated by intensive solar radiation, the heat and / or light permeability is reversed so that less energy is allowed into the interior of the room.

Alternatively or additionally, the lamellar body and / or the reflection foil can have a heat and / or light permeability which can be changed by applying current. For example, a film may be applied to the respective lamellar body, which can be switched by applying current in a more transparent state or optionally in a more opaquen state.

Advantageously, the lamellar body and / or the reflection foil may be designed to be bistable with regard to heat and / or light transmittance such that the light transmittance is stable in the current-free state. This has the advantage that only for switching from one state to the other and vice versa electrical energy is needed. In order to keep the respective state, however, no electrical energy needs to be used.

Such a switching of the heat and / or light transmittance can be achieved, for example, advantageously by a layer of so-called electronic paper, which as a rule comprises at least two thin film layers, between which microcapsules with differently colored and / or differently transparent pigment particles are enclosed that are electrically rechargeable. The two film layers serve here as negative electrode or positive electrode, so that different microcapsules are aligned with the surface of one or the other film depending on the application of the corresponding voltage. By corresponding electrode grid on each film layer in this case different heat and / or Lichtdurchgängigkeiten can be achieved.

Through a layer of such electronic paper also different colored tints can be achieved. In a simple embodiment of the invention, bicoloratable, in particular black and white, electronic paper can be used. Alternatively, however, a multicolor electronic paper can be applied in development of the invention, which can take several colors.

Fig. 1:

Eine ausschnittweise Darstellung einer Blendschutzvorrichtung 2 übereinander angeordneten, in der geschlossenen Stellung befindlichen Lichtumlenklamellen nach einer bevorzugten Ausführung der Erfindung,

Fig. 2:

eine ausschnittsweise Darstellung der Blendschutzvorrichtung aus Fig. 1, die die geöffnete Stellung der Lichtumlenklamellen mit im Wesentlichen horizontaler Ausrichtung zeigt, und

Fig. 3:

eine ausschnittsweise Draufsicht auf die Perforation einer Lichtumlenklamelle.

The invention will be explained in more detail below with reference to a preferred embodiment and associated drawings. In the drawings show:

Fig. 1:

A detail of an anti-glare device 2 arranged one above the other, in the closed position Lichtumlenklamellen according to a preferred embodiment of the invention,

Fig. 2:

a partial view of the anti-glare device Fig. 1 showing the open position of the Lichtumlenklamellen with substantially horizontal orientation, and

3:

a partial plan view of the perforation of a Lichtumlenklamelle.

The anti-glare device 1 shown in the figures comprises a sipe system 2 with a plurality of superimposed Lichtumlenklammellen 3, which have an overall elongated shape in the manner of a Stranggußprofils and at their end faces about a pivot axis 4 which extends parallel to the longitudinal axes of the Lichtumlenklamellen 3 and the longitudinal axis of the respective Lichtumlenklamelle can also coincide, are pivotally mounted, so that the Lichtumlenklamellen 3 between the in Fig. 1 shown closed position and the in Fig. 2 shown open position can be pivoted.

As Fig. 2 shows, the Lichtumlenklamellen are curved like a channel, in particular in the cross-section according to Fig. 2 the top of Lichtumlenklamellen 3 concave may be curved, wherein the radius of curvature R is advantageously greater than the width B of Lichtumlenklamellen 3. In the illustrated embodiment, the curvature radius R is between 120% and 200% of the width B.

On their longitudinal sides, the Lichtumlenklamellen have 3 for concave curvature of the upper side opposite edge-side folds 5 and curved edge webs, on the one hand in the closed position of Lichtumlenklamellen 3 according to Fig. 1 cause a pan-shaped superimposition and thus a better completion of the Lichtumlenklamellen 3 and on the other hand give the Lichtumlenklamellen 3 a higher mechanical stiffness. As Fig. 1 shows, the Lichtumlenklamellen 3 are arranged such that in the closed position, the edge-side folds 5 of two adjacent Lichtumlenklamellen 3 overlap each other.

According to one embodiment of the present invention, the Lichtumlenklamellen 3 made of a transparent plastic which is partially vapor-deposited aluminum on the upper side of Lichtumlenklamellen 3, so that the upper surface acts reflective and the Lichtumlenklamellen 3 have a transmittance of about 5%.

Alternatively, the lamellar body 6 of the Lichtumlenklamellen 3 consist of an opaque material, in particular consist of aluminum profiles having a perforation 7 with rows arranged staggered holes 8 (see. Fig. 3 ), wherein on the upper side of the Lichtumlenklamellen 3, a mirror film 9 is applied, which covers the entire surface of Lichtumlenklamellen 3 and thus also covers said holes 8 of the perforation 7. The mirror film 9 is formed partially permeable, wherein the transmittance can be advantageously 10%. This provides a substantially unrestricted interior-to-exterior relationship while maintaining the desired dimming effect.

By pivoting about the pivot axes 4, the slats can be placed according to the external brightness and tanning of the facade according to the visual and climatic requirements in the best possible position.

This results in an optimal sun protection with completely closed lamellae, as this Fig. 1 shows, while the highest light transmission is achieved with a transmittance of about 80% in the open position, as this Fig. 2 shows.

Advantageously, the anti-glare device 1 can be behind a standard heat protection glazing, for example in the form of a double glass, or in particular between a box window having a single glass and a double glass, integrated, creating a high quality sun and glare and optimal daylight deflection with unrestricted reference of Inside to the outside is achieved.

Without Fig. 3 this would explicitly show, differently sized holes in different areas of the light lamella can be arranged in the manner described above.

The reflection film covering the holes may be formed in the manner described in more detail above.

Claims (15)

Anti-glare device comprising a plurality of elongated Lichtumlenklamellen (3) arranged on their upper sides (10) formed light-reflecting and preferably curved in cross-section, wherein the Lichtumlenklamellen (3) have a perforated, holes (8) having lamellar body (6), characterized in that a partially transmissive reflection foil with a transmittance in the range from 2% to 50% covering the holes (8) is applied to the perforated lamellar body (6). Glare protection device according to the preceding claim, wherein the reflection foil consists of a partially transparent mirror foil (9) with a transmittance between 5% and 25%, preferably about 7% to 12%. Anti-glare device according to one of the preceding claims, wherein the perforated lamellar body (6) made of a transparent material, on which a partially transparent coating with a transmittance in the range from 2% to 50%, preferably in the form of a partially permeable Aluminiumabampfung with a transmittance in the range of 2% to 10%, in particular about 5%, is applied. Glare protection device according to one of the two preceding claims, wherein the holes (8) in the lamellar body (6) have an area fraction of 30% to 70%, preferably about 50%, of the entire area having the perforation. Glare protection device according to the preceding claim, wherein substantially the entire lamellar body (6) is perforated and / or the holes (8) are arranged in a grid in rows parallel to the lamella longitudinal direction. Anti-glare device according to one of the preceding claims, wherein the holes (8) have a diameter in the range of 1 mm to 5 mm, preferably about 2 mm to 3 mm. Glare protection device according to one of the preceding claims, wherein holes (8) of different sizes are provided in different sections of the lamella body (6), wherein in a central portion of the lamella body (6) in the region of the longitudinal axis of the lamellar body smaller holes (8) and to the edges of the lamellar body (6), in particular in the marginal coverage areas of the lamellar body (6), larger holes (8) are provided. The anti-glare device according to the preceding claim, wherein in the central portion of the fin body (6), a number of the smaller holes (8) per unit area is larger than a number of the larger holes (8) per unit area in the edge portions of the fin body (6), that in the edge sections as well as in the central portion of the lamellar body (6) equally the holes each have an area ratio of 30% to 70%, preferably about 50%, on the entire surface having the perforation. Anti-glare device according to one of the preceding claims, wherein the lamellar body (6) and / or the reflection foil (7) are formed polarizing. Anti-glare device according to the preceding claim, wherein the lamellar body (6) and / or the reflection foil (7) have a polarization which can be changed by application of electricity. Anti-glare device according to one of the preceding claims, wherein the lamellar body (6) and / or the reflection film (7) applied thereto with respect to heat radiation is bi-directional such that of the Lichtumlenklamellen (3) more short-wave radiation from an outside to an inside of the anti-glare device is transmitted as long-wave radiation from the inside to the outside. Glare protection device according to one of the preceding claims, wherein the lamellar body (6) and / or the reflection foil (7) have a light transmittable by heat and / or current loading. Anti-glare device according to the preceding claim, wherein the lamellar body and / or the reflection foil (7) is formed bi-stable with respect to the light transmittance such that the light transmittance in the current-free state is stable. Anti-glare device according to one of the preceding claims, wherein the lamellar body (6) and / or the reflection foil (7) comprises at least one layer of electronic paper, preferably at least two thin foil layers, between which microcapsules with differently colored Including pigment particles which are electrically chargeable. Anti-glare device according to one of claims 12 to 14, wherein the lamellar body (6) and / or the reflection film (7) is self-adjusting with respect to the light transmittance such that upon increasing the heat and / or light exposure of Lichtumlenklamellen (3), the light transmission decreases.

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