Light guiding slats having at least partially metallic-shining reflective upper sides for deflecting daylight and sun radiation,
Light guiding slats in horizontal parallel arrangement spaced relative to one another, Light guiding slats disposed preferably outside, in front of, or within or behind glass fa- gades and glass roofs, characterized in
- that the upper sides of the light guiding slats include at least partially shaped line shaped indents (15 - 19) and
- that the line shaped indents (15 - 19) extend straight or diagonal, perpendicularly and/or inclined relative to the slat edges, and
- that the line shaped indents are designed to reflect light.
Light guiding slats according to claim 1 , characterized in that the line shaped indents constitute V-shaped or U-shaped grooves. Claim 3
Light guiding slats according to claim 1 , characterized in that the line shaped indents have a diamond shaped pattern.
Light guiding slat according to claim 1 , characterized in that the line shaped indents extend in wave form.
Light guiding slats according to claim 1 , characterized in that the line shaped indents are embossed into a surface by means of an embossing stamp in the printing process. Claim 6
Light guiding slats according to claim 5, characterized in that the line shaped indents are embossed by means of an embossing roll in the rotary process.
Light guiding slats according to claim 1 , characterized in that after the provision of the line shaped indents, the light guiding slats are made in concave/convex form. Claim 8
Light guiding slats according to claim 1 , characterized in that the optical appearance of line shaped indents is generated by holograms.
Light guiding slats according to claim 1 and 8, characterized in that the reflective surfaces having line shaped indents or holograms are applied to foils, and the foils are applied onto the slats.
Light guiding slats according to claim 1 , characterized in that the line shaped indents Are applied in smaller strips on parts of a slat only and that those parts are parallel to a slat edge.
The present invention relates to light guiding slats as in accordance with the preamble of the main claim.
It has been known to produce Venetian blinds including reflective slat upper sides. By means of such prior art light guiding slats, deflection to the ceiling of the interior room is obtained.
It is of disadvantage that the sun, or the day light, depending on the direction of the incident sun (azimuth) is preferably deflected into only one half of the room and the inte- rior of the room is asymmetrically illuminated with large light volume differences. In order to counteract such disadvantage, it might for instance be possible to insert an additional light dispersing glazing behind the light guiding slats or a second vertical slat curtain by which an additional horizontal light deflection is obtained. The disadvantage of such additive measures includes the loss of transparency of the sun light guiding system, additional costs for such separate devices, increased maintenance etc.
In order to avoid such disadvantages, it is the task of the present invention to modify the light guiding surfaces of Venetian blind slats and Venetian blind-similar window curtains and devices so that in addition to the vertical light deflection, simultaneous horizontal light deflection for improved and even bi-directional room illumination is obtained.
This task is solved according to the characterizing clause of the main claim. The advantage is a more complete room illumination over the two room halves, even in case of unilaterally oblique sun light incidence, since the sun light is bi-directionally distributed in the room. The figures will explain further advantages.
Figures 1 - 3 show the ground plan of an interior room with unilateral sun incidence and advantageous light distribution.
Figure 4 shows the top view on a slat having line shaped indents.
Figure 5 shows the longitudinal cross section of a slat according to Figure 4.
Figures 6, 7, 8 show different line shaped indents.
Figure 9 shows a diamond shaped pattern of line shaped indents.
Figure 10 shows a wave shaped pattern of line shaped indents. Figure 1 shows the ground plan including a row of windows 10, the sun incidence 1 1 and the advantageous horizontal light distribution in different directions, indicated by light arrows 12, 13, 14.
Figures 2 and 3 show a comparable horizontal, multi-directional light distribution in the interior room in spite of perpendicular, or unilateral, sun light incidence. These advantageous effects of even room illumination will be obtained by the innovative line shaped indents at right angles relative to the longitudinal direction of the slats
Figures 4 to 10 show variants on the line shaped indents of the kind of grooves in the reflective surface. In Figure 4, these line shaped indents 15 to 19 are embossed into the surface perpendicular relative to the longitudinal edges of the slat. Figure 5 shows the cross section of the slat surface. The line shaped indents 15 to 19 of Figure 4 are V-shaped. Figures 6 to 8 show various reflective line shaped indents and the light deflective behaviour thereof. In the following, the optical effect of the line shaped indents will be explained. In Figure 4, a beam 21 is deflected on the smooth slat upper side, according to the optical law "angle of incidence = angle of reflection", without any horizontal change of direction, upwards to the ceiling of the interior room. A beam 20 from the same direction onto an inclined reflective face of the line shaped indent 16 is deflected not only vertically to the ceiling but simultaneously into different space directions. A light scattering, or light distribution, respectively, is obtained over the width of a space.
Figures 5 and 6 show the slats of Figure 4 in longitudinal cross section with beams 20 and 21 of Figure 4, and the deflection of the beams showing in different directions.
Figures 7 and 8 show different line shaped indents, for instance in the shape of a tub or a channel, in order to obtain additional volume scattering effects in the light deflection. Depending on the design of the line shaped indents, any kinds of volume scattering ef- fects or any horizontal and vertical light distribution may be obtained in different space directions on interior walls and ceilings. The line shaped indents are provided symmetrically. In the drawing, the symmetry axes 40 to 42 are dotted.
Those line shaped indents may also be applied to z or w shaped blinds or any other forms of blinds either on their complete upper surface or only onto smaller stripes within the upper surface.
Figures 9 and 10 show, purely as an example, different patterns of the line shaped indents which, particularly in case of perpendicular sun incidence 30, 31 on the fagade, make advantageous light distribution effects possible in at least two space directions at the same time. In Figure 9, this is obtained by means of a diamond shaped design, in Figure 10 by a wave shaped design. The wave shaped design permits the best spatial distribution of parallel light incidence 49 to 52 in all space directions 45 to 48.
The line shaped indents for instance are embossed in thin aluminium foil strips by means of embossing rolls. In case of slats having a thickness of from 0.15 to 0.5 mm, the line shaped indents may be made very delicate, even clearly < 0.1 m. The width and the depth of the line shaped indents may also be produced as "scratches", i.e. minutest indents preferably larger than the wavelength of light. It is also possible to heap up edge elevations of displaced material at the edges of the indents so that, in addition to the valleys with the indents, small bulges are formed.
The line shaped indents may extensively be made at discretion, even without forming any precise geometrical patterns. In order to obtain the advantageous effects of the innovation, the finish structure is essentially provided within at right angles relative to the slat edges.
Typical production procedures include the rolling method. By means of embossing rolls which show the line shaped pattern as elevations, the pattern may be embossed deeper into the gleaming slat material. Holographic patterns may be transferred onto a slat shaped aluminium surface by means of embossing rolls as well, producing optical patterns having line shaped indents. The holograms are inscribed into the embossing rolls and transferred onto the slat material. In further processing steps, the slats including the indents on the surfaces may be varnished. In this case, additional prismatic light effects including increased light scattering are obtained. Further manufacturing processes include vaporizing or sputtering embossed surfaces in a further process step in order to apply metal oxides or high-purity aluminium for mirror coating of the surface.
Other production procedures provide that foils having corresponding embossings and/or vapour depositions be applied onto the slats.
It is obvious that all surface finishes of the innovative kind described may also be applied on broad foil strips which are subsequently split up to small strips. The line shaped indents may also be provided in part areas of a slat only. Further developments provide that linear prism shaped groove patterns extending in parallel relative to the longitudinal direction of the slat and serving to deflect sun light be crossed by the innovative indents. In this way, the sun which is reflected to the outside and/or is deflected towards the inside may be distributed in various directions.
The descriptions of the figures are limited to slats having smooth upper sides. The invention is not, however, restricted to those cases only. The indents may for instance also be provided in prism-structured slats as have been known from EP 1212508 B1. The prism lines are crosswise superimposed and the indents show the line patterns discontinued by the prisms.
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