EP1201872B1 - Device for redirecting light for room lighting - Google Patents
Device for redirecting light for room lighting Download PDFInfo
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- EP1201872B1 EP1201872B1 EP01125174A EP01125174A EP1201872B1 EP 1201872 B1 EP1201872 B1 EP 1201872B1 EP 01125174 A EP01125174 A EP 01125174A EP 01125174 A EP01125174 A EP 01125174A EP 1201872 B1 EP1201872 B1 EP 1201872B1
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- Prior art keywords
- light
- optical element
- boundary area
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- area
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
- E06B2009/2417—Light path control; means to control reflection
Definitions
- the invention relates to a device for light deflection and suppression for stationary use in a translucent building facade for targeted illumination of an interior with at least one translucent optical element having a newly formed light entrance side and a light exit side provides that of a first curved interface and is limited at least by a second interface, wherein the curvature of the first interface is formed such that light rays that impinge on the light entrance side from a first solid angle range and in the optical element be coupled by total reflection at the first interface to the area of the second interface and that light rays that impinge from a second solid angle range on the light entrance side and couple into the optical element exit through the first interface of the optical element.
- FIG. 2 An aforementioned device for light deflection and suppression is described in DE 196 13 222 A1.
- the device shown in the above document is the targeted shading of sunlight, which impinges on translucent building facades for interior lighting.
- the optical operating principle on which the known device is based is given by the spatial geometry of an optical element which overlays or blends out the sunlight and is fundamentally based on the light concentration and the light deflection of solar radiation within a defined angle of incidence range, ie the optical element is able to concentrate all those solar beams , which incident on the optical element from a predetermined first solid angle range and all other sun rays are deflected accordingly.
- FIG. 2 in which the functional principle of the known optical element is shown.
- each optical element C has continuously curved side walls, which in each case terminate with a light exit side D which has just been formed.
- the optical element C can be formed either uniaxially linear or rotationally symmetrical or biaxially or diagonally blended.
- the curvature of the side walls of the optical element C is formed such that light rays incident on the light entrance side A from a solid angle region B are concentrated on the light exit side D by total reflection at the side surfaces in the interior of the optical element.
- the light exit side D is provided with a coating E, which either absorbs the radiation or reflects back into the inlet half space B.
- optical elements are appropriately arranged along a translucent building façade F, as shown in FIG. 3, then the optical elements are capable of correspondingly redirecting, reflecting or absorbing the light beams incident on the light entry side.
- FIG. 3 shows possibilities of a corresponding deflection of light by the optical element in front of a building facade F.
- light beams can be selectively redirected into the interior of buildings or reflected back into the free atmosphere.
- the boundary edges between the sidewalls and the light exit side are critical regions for the function of the optical element, especially since the maximum radiation concentration occurs at these edges with a corresponding angle of incidence of the light.
- the optical element experiences a light intensity increase along the boundary edges, in particular in the direction of view, which severely impairs the visual appearance of the device.
- the light-refracting edges already come into the foreground visually in the case of slightly non-uniform configurations with regard to the shape, size and position of the light exit surfaces in relation to the respective side walls of the optical element.
- To create a uniform arrangement are high demands on manufacturing tolerances in the Production of such optical elements to provide, which is associated with high production costs.
- the invention has the object of providing a device for light deflection and suppression for stationary use in a translucent building facade for targeted illumination of an interior with at least one translucent optical element, according to the preamble of claim 1 such that on the one hand the visually irritating, to the transition edges between the side walls and the light exit surface excessive light intensities should be avoided.
- it is also to create opportunities to reduce the cost of manufacturing such optical elements, which is particularly due to the high tolerance requirements.
- measures should be taken to allow adjustment of the effective angle ranges.
- the translucent optical element has a light entry side and a light exit side delimited by a first curved interface and at least a second interface, wherein the curvature of the first interface is formed such that light rays from a first Solid angle range impinge on the light entrance side and couple into the optical element by total reflection at the first interface to the area of the second interface and that light rays incident from a second solid angle range on the light entrance side and couple into the optical element, through the first Exit interface from the optical element, further developed such that the second interface also curved steadily is formed, and that connect the first and the second interface seamlessly with a continuous curvature behavior to each other.
- optical elements formed in this way can be obtained in particular in a simple manufacturing process step, for example in the context of a casting process, with the complete form of the optical element is already available.
- the light exit side is provided with a coating.
- the curved second boundary surface can likewise be completely provided with a coating, for example with a dip paint, in order, for example, to effect a backscattering of the light into the inlet half space, provided that a dip paint with corresponding reflectivity is selected.
- the optical function corresponds the optical element according to the invention designed exactly that optical function of the known optical element, since all the radiation that would impinge on the original light exit surface would also be thrown back into the strictraum.
- FIG 1a a longitudinal section through four juxtaposed optical elements C is shown, as the representation of Figure 2 to the prior art. It is essential that the second interface G2 is continuously connected to the side wall region of the optical element C, which represents the first interface G1.
- the interface G2 has a continuous curvature in itself and avoids any edges, in particular in the seam area between the interface G1 and interface G2.
- the boundary surface G2 is covered with a coating E.
- the coating may be designed to be reflective, so that light rays that impinge on the coating in G1 within the optical element are reflected back, so that the light beams coupled into the optical element from the half space B emerge again into this half space.
- the interface G2 over the entire surface, ie provided with the coating E up to the section line I it is optically to be equated with the known optical element according to the aforementioned German patent application. Due to the continuously curved formation of the interface G2, however, it is also possible to provide the coating only partially on the interface G2 and to place it on the interface G2 individually.
- FIG. 1b shows such an embodiment, in which a corresponding asymmetry is imposed on the optical element by displacement of the printed or coated region E on the interface G2. This ensures that the Ausblend Scheme can be set individually.
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Optical Elements Other Than Lenses (AREA)
- Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Vorrichtung zur Lichtumlenkung sowie -ausblendung für den stationären Einsatz bei einer transluzenten Gebäudefassade zur gezielten Beleuchtung eines Innenraumes mit wenigstens einem transluzenten optischen Element, das eine eben ausgebildete Lichteintrittsseite aufweist sowie eine Lichtaustrittsseite vorsieht, die von einer ersten gekrümmten Grenzfläche sowie zumindest von einer zweiten Grenzfläche begrenzt ist, wobei die Krümmung der ersten Grenzfläche derart ausgebildet ist, dass Lichtstrahlen, die aus einem ersten Raumwinkelbereich auf die Lichteintrittsseite auftreffen und in das optische Element einkoppeln im Wege der Totalreflexion an der ersten Grenzfläche auf den Bereich der zweiten Grenzfläche konzentriert werden und dass Lichtstrahlen, die aus einem zweiten Raumwinkelbereich auf die Lichteintrittsseite auftreffen und in das optische Element einkoppeln durch die erste Grenzfläche aus dem optischen Element austreten.The invention relates to a device for light deflection and suppression for stationary use in a translucent building facade for targeted illumination of an interior with at least one translucent optical element having a newly formed light entrance side and a light exit side provides that of a first curved interface and is limited at least by a second interface, wherein the curvature of the first interface is formed such that light rays that impinge on the light entrance side from a first solid angle range and in the optical element be coupled by total reflection at the first interface to the area of the second interface and that light rays that impinge from a second solid angle range on the light entrance side and couple into the optical element exit through the first interface of the optical element.
Eine vorstehend genannte Vorrichtung zur Lichtumlenkung sowie -ausblendung ist in der DE 196 13 222 A1 beschrieben. Die in der vorstehenden Druckschrift dargestellte Vorrichtung dient der gezielten Abschattung von Sonnenlicht, das auf transluzente Gebäudefassaden zur Innenraumbeleuchtung auftrifft. Das der bekannten Vorrichtung zugrundeliegende, optische Funktionsprinzip ist durch die Raumgeometrie eines, das Sonnenlicht um- bzw. ausblendende optischen Elementes vorgegeben und basiert grundsätzlich auf der Lichtkonzentration sowie der Lichtumlenkung von Sonnenstrahlung innerhalb eines definierten Einfallswinkelbereiches, d. h. das optische Element vermag all jene Sonnenstrahlen zu konzentrieren, die aus einem vorgegebenen ersten Raumwinkelbereich auf das optische Element einfallen und alle weiteren Sonnenstrahlen werden entsprechend umgelenkt. Zur näheren Erläuterung wird auf die Figur 2 verwiesen, in der das Funktionsprinzip des bekannten optischen Elementes dargestellt ist. Figur 2 zeigt vier im Längsschnitt dargestellte, nebeneinander angeordnete optische Elemente C die jeweils über eine gemeinsame Lichteintrittsseite A verfügen. Jedes einzelne optische Element C weist stetig gekrümmte Seitenwände auf, die jeweils mit einer eben ausgebildeten Lichtaustrittsseite D abschließen. Das optische Element C kann entweder einachsig linear als auch rotationssymmetrisch oder zweiachsig oder diagonal verschnitten ausgeformt sein. Die Krümmung der Seitenwände des optischen Elementes C ist derart ausgebildet, dass Lichtstrahlen, die auf die Lichteintrittsseite A aus einem Raumwinkelbereich B auftreffen, im Wege der Totalreflexion an den Seitenflächen im Inneren des optischen Elementes auf die Lichtaustrittsseite D konzentriert werden. Vorzugsweise ist die Lichtaustrittsseite D mit einer Beschichtung E versehen, die die Strahlung entweder absorbiert oder in den Eintrittshalbraum B zurückreflektiert. Auf diese Weise werden alle Lichtstrahlen, die aus dem Raumwinkelbereich B auf die Lichteintrittsseite des jeweiligen optischen Elementes C auftreffen, vor dem ungehinderten Hindurchtreten durch das optische Element gehindert, sie werden also gezielt ausgeblendet. Lichtstrahlen, die auf die Lichteintrittsseite A auftreffen, die außerhalb des Raumwinkels D liegen, gelangen hingegen in das optische Element C und treten aus den Seitenwänden aus dem Element aus und erfahren dabei eine Umlenkung bzw. Auffächerung.An aforementioned device for light deflection and suppression is described in DE 196 13 222 A1. The device shown in the above document is the targeted shading of sunlight, which impinges on translucent building facades for interior lighting. The optical operating principle on which the known device is based is given by the spatial geometry of an optical element which overlays or blends out the sunlight and is fundamentally based on the light concentration and the light deflection of solar radiation within a defined angle of incidence range, ie the optical element is able to concentrate all those solar beams , which incident on the optical element from a predetermined first solid angle range and all other sun rays are deflected accordingly. For a more detailed explanation, reference is made to FIG. 2, in which the functional principle of the known optical element is shown. FIG. 2 shows four optical elements C arranged side by side, shown in longitudinal section, each having a common light entry side A. Each individual optical element C has continuously curved side walls, which in each case terminate with a light exit side D which has just been formed. The optical element C can be formed either uniaxially linear or rotationally symmetrical or biaxially or diagonally blended. The curvature of the side walls of the optical element C is formed such that light rays incident on the light entrance side A from a solid angle region B are concentrated on the light exit side D by total reflection at the side surfaces in the interior of the optical element. Preferably, the light exit side D is provided with a coating E, which either absorbs the radiation or reflects back into the inlet half space B. In this way, all the light rays, which impinge from the solid angle region B on the light entrance side of the respective optical element C, prevented from unimpeded passage through the optical element, so they are hidden specifically. On the other hand, light rays which impinge on the light entrance side A, which lie outside the solid angle D, enter the optical element C and emerge from the side walls of the element, experiencing a diversion or fanning out.
Sind derartige optische Elemente entsprechend längs einer transluzenten Gebäudefassade F angebracht, wie es in Figur 3 dargestellt ist, so vermögen die optischen Elemente die auf die Lichteintrittsseite einfallenden Lichtstrahlen entsprechend umzulenken, zu reflektieren bzw. zu absorbieren. In Figur 3 sind Möglichkeiten einer entsprechenden Lichtumlenkung durch das optische Element vor einer Gebäudenfassade F dargestellt. Je nach Orientierung der optischen Elemente gegenüber der einfallenden Lichtstrahlen können Lichtstrahlen gezielt in das Innere von Gebäuden umgelenkt werden oder wieder zurück in die freie Atmosphäre reflektiert werden.If such optical elements are appropriately arranged along a translucent building façade F, as shown in FIG. 3, then the optical elements are capable of correspondingly redirecting, reflecting or absorbing the light beams incident on the light entry side. FIG. 3 shows possibilities of a corresponding deflection of light by the optical element in front of a building facade F. Depending on the orientation of the optical elements with respect to the incident light beams, light beams can be selectively redirected into the interior of buildings or reflected back into the free atmosphere.
Da jedoch das vorstehend gezeigte optische Element als Optimalform aus einem Randstrahlenprinzip konstruiert ist, sind die begrenzenden Kanten zwischen den Seitenwänden und der Lichtaustrittsseite für die Funktion des optischen Elementes kritische Bereiche, zumal an diesen Kanten bei entsprechendem Einfallswinkel des Lichtes die maximale Strahlungskonzentration auftritt. Durch fertigungsbedingt auftretende Kantenrundungen erfährt das optische Element insbesondere in Durchblickrichtung eine Lichtintensitätsüberhöhung entlang der Grenzkanten, die das optische Erscheinungsbild der Vorrichtung stark beeinträchtigt.However, since the optical element shown above is constructed as an optimum shape from a marginal ray principle, the boundary edges between the sidewalls and the light exit side are critical regions for the function of the optical element, especially since the maximum radiation concentration occurs at these edges with a corresponding angle of incidence of the light. As a result of production-related edge rounding, the optical element experiences a light intensity increase along the boundary edges, in particular in the direction of view, which severely impairs the visual appearance of the device.
Insbesondere bei der linearförmigen bzw. arrayförmigen Anordnung bestehend aus einer Vielzahl optischer Elemente treten bereits bei geringfügig ungleichförmigen Ausbildungen bezüglich der Form, Größe und Lage der Lichtaustrittsflächen in Relation zu den jeweiligen Seitenwänden des optischen Elementes die lichtbrechenden Kanten optisch stark in den Vordergrund. Um eine gleichmäßige Anordung zu schaffen sind hohe Anforderungen an Fertigungstoleranzen bei der Herstellung derartiger optischer Elemente zu stellen, was jedoch mit hohen Herstellungskosten verbunden ist.Particularly in the case of the linear or array-shaped arrangement consisting of a large number of optical elements, the light-refracting edges already come into the foreground visually in the case of slightly non-uniform configurations with regard to the shape, size and position of the light exit surfaces in relation to the respective side walls of the optical element. To create a uniform arrangement are high demands on manufacturing tolerances in the Production of such optical elements to provide, which is associated with high production costs.
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zur Lichtumlenkung sowie -ausblendung für den stationären Einsatz bei einer transluzenten Gebäudefassade zur gezielten Beleuchtung eines Innenraums mit wenigstens einem transluzenten optischen Elementes, gemäß dem Oberbegriff des Anspruches 1 derart weiterzubilden, dass einerseits die optisch irritierenden, an den Übergangskanten zwischen den Seitenwänden und der Lichtaustrittsfläche überhöhten Lichtintensitäten vermieden werden sollen. Insbesondere gilt es zudem Möglichkeiten zu schaffen, den Aufwand bei der Fertigung derartiger optischer Elemente zu reduzieren, der insbesondere durch die hohen Toleranzanforderungen bedingt ist. Schließlich sollen Massnahmen getroffen werden, um eine Anpassung der wirksamen Winkelbereiche zu ermöglichen.The invention has the object of providing a device for light deflection and suppression for stationary use in a translucent building facade for targeted illumination of an interior with at least one translucent optical element, according to the preamble of claim 1 such that on the one hand the visually irritating, to the transition edges between the side walls and the light exit surface excessive light intensities should be avoided. In particular, it is also to create opportunities to reduce the cost of manufacturing such optical elements, which is particularly due to the high tolerance requirements. Finally, measures should be taken to allow adjustment of the effective angle ranges.
Die Lösung der der Erfindung zugrundeliegenden Aufgabe ist im Anspruch 1 angegeben. Den Erfindungsgedanken vorteilhaft weiterbildenden Merkmale sind Gegenstand der Unteransprüche sowie der übrigen Beschreibung insbesondere unter Bezugnahme auf die Ausführungsbeispiele zu entnehmen.The solution of the problem underlying the invention is specified in claim 1. The concept of the invention advantageously further features are the subject of the dependent claims and the rest of the description in particular with reference to the exemplary embodiments.
Erfindungsgemäß ist das transluzente optische Element, das einen eben ausgebildete Lichteintrittsseite aufweist sowie eine Lichtaustrittsseite vorsieht, die von einer ersten gekrümmten Grenzfläche sowie zumindest von einer zweiten Grenzfläche begrenzt ist, wobei die Krümmung der ersten Grenzfläche derart ausgebildet ist, dass Lichtstrahlen, die aus einem ersten Raumwinkelbereich auf die Lichteintrittsseite auftreffen und in das optische Element einkoppeln im Wege der Totalreflexion an der ersten Grenzfläche auf den Bereich der zweiten Grenzfläche konzentriert werden und dass Lichtstrahlen, die aus einem zweiten Raumwinkelbereich auf die Lichteintrittsseite auftreffen und in das optische Element einkoppeln, durch die erste Grenzfläche aus dem optischen Element austreten, derart weitergebildet, dass die zweite Grenzfläche ebenfalls stetig gekrümmt ausgebildet ist, und dass die erste und die zweite Grenzfläche nahtlos mit einem stetigen Krümmungsverhalten aneinander anschließen.According to the invention, the translucent optical element has a light entry side and a light exit side delimited by a first curved interface and at least a second interface, wherein the curvature of the first interface is formed such that light rays from a first Solid angle range impinge on the light entrance side and couple into the optical element by total reflection at the first interface to the area of the second interface and that light rays incident from a second solid angle range on the light entrance side and couple into the optical element, through the first Exit interface from the optical element, further developed such that the second interface also curved steadily is formed, and that connect the first and the second interface seamlessly with a continuous curvature behavior to each other.
Durch die erfindungsgemäße Maßnahme wird einerseits vermieden, dass zwischen den Seitenwänden des optischen Elementes sowie der Lichtaustrittsseite Kanten auftreten, entlang deren Lichtintensitätsüberhöhungen auftreten. Die auf diese Weise ausgebildeten optischen Elemente können insbesondere in einem einfachen Herstellverfahrensschritt gewonnen werden, beispielsweise im Rahmen eines Gießprozesses, mit dem bereits die vollständige Form des optischen Elementes erhältlich ist. Insbesondere ist es möglich, das optische Element aus einem einstückigen Werkstoff, beispielsweise Gussglas zu fertigen, bei dem es lediglich auf die äußere Kontur, d. h. die äußere Profilform ankommt.By means of the measure according to the invention, on the one hand it is avoided that edges occur between the side walls of the optical element and the light exit side along which light intensity peaks occur. The optical elements formed in this way can be obtained in particular in a simple manufacturing process step, for example in the context of a casting process, with the complete form of the optical element is already available. In particular, it is possible to manufacture the optical element from a one-piece material, such as cast glass, in which it is only on the outer contour, d. H. the outer profile shape arrives.
Selbstverständlich ist es auch möglich, die bestimmte Profilform des optischen Elementes insbesondere im Bereich der Lichtaustrittsfläche in einem zweikomponentigen Verfahren herzustellen, bei dem ein entsprechend geformtes Profil beispielsweise aus einem opaken Material auf die Lichtaustrittsfläche eines bekannten optischen Elementes, wie es aus der DE 196 13 222 A1 hervorgeht, aufgebracht wird.Of course, it is also possible to produce the particular profile shape of the optical element, in particular in the region of the light exit surface in a two-component process, in which a correspondingly shaped profile, for example of an opaque material on the light exit surface of a known optical element, as described in DE 196 13 222 A1 is applied, is applied.
Um Licht, das auf die Lichteintrittsseite des optischen Elementes innerhalb eines bestimmten Raumwinkelbereiches B auszublenden, das übrige auf Lichteintrittsseite auftreffende Licht jedoch im Wege der Lichtumlenkung hindurchzulassen, ist wie bereits im Stand der Technik erwähnt, die Lichtaustrittsseite mit einer Beschichtung versehen. In gleicher Weise kann die gekrümmt ausgebildete zweite Grenzfläche ebenfalls mit einer Beschichtung, beispielsweise mit einem Tauchlack vollständig versehen werden, um beispielsweise eine Rückstreuung des Lichtes in den Eintrittshalbraum zu bewirken, sofern man einen Tauchlack mit entsprechenden Reflektivität wählt. Erstreckt sich der Bereich der Beschichtung über die gesamte Fläche der zweiten Grenzfläche, also bis zu jener Grenzlinie, an der sich der erste Grenzbereich des an sich bekannten optischen Elementes gemäß der Offenlegungsschrift DE 196 13 222 anschließt, so entspricht die optische Funktion des erfindungsgemäß ausgebildeten optischen Elementes genau jener optischen Funktion des an sich bekannten optischen Elementes, da ebenfalls die gesamte Strahlung, die auf die ursprüngliche Lichtaustrittsfläche auftreffen würde, in den Eintrittshalbraum zurückgeworfen würde. Die Veränderung der erfindungsgemäß ausgebildeten Form ist jedoch zum einen aus produkttechnischer Sicht von großem Vorteil zumal jegliche scharfe Kanten vermieden werden. Überdies ist es möglich, durch Variation bzw. durch Verschiebung des beschichteten Bereiches auf dem optischen Element im Bereich der zweiten Grenzfläche einen individuellen Ausblendbereich in einem bestimmt vergebenen Winkelbereich zu erhalten, ohne dass eine Änderung der Grundform des optischen Elementes erforderlich ist. Auf diese Weise können auf der Basis einer einzigen Grundform eines optischen Elementes durch unterschiedliche Bedruckung und/bzw. Beschichtung im Bereich der zweiten Grenzfläche optische Elemente mit verschiedenen Transmissionswinkelcharakteristika hergestellt werden. Insbesondere können auf diese Weise auch asymmetrische Winkelkarakteristika auf der Basis symmetrischer Grundformen der optischen Elemente erzeugt werden. Bei zu großen Abweichungen von der symmetrischen Bedruckung bzw. Beschichtung wird jedoch die Rückreflexion in den Eintrittshalbraum geringer, zumal ein Teil der Strahlung auch durch die unbedruckten Seitenbereiche des optischen Elementes transmittiert wird.In order to block out light incident on the light entry side of the optical element within a certain solid angle range B, but to pass the remaining light incident on the light entrance side by way of light deflection, as already mentioned in the prior art, the light exit side is provided with a coating. In the same way, the curved second boundary surface can likewise be completely provided with a coating, for example with a dip paint, in order, for example, to effect a backscattering of the light into the inlet half space, provided that a dip paint with corresponding reflectivity is selected. If the area of the coating extends over the entire area of the second boundary surface, ie up to the boundary line at which the first boundary area of the known optical element according to the published patent application DE 196 13 222 follows, then the optical function corresponds the optical element according to the invention designed exactly that optical function of the known optical element, since all the radiation that would impinge on the original light exit surface would also be thrown back into the Eintrittshalbraum. The change of the inventively embodied form, however, on the one hand from a product technical point of view of great advantage, especially since any sharp edges are avoided. Moreover, it is possible by variation or displacement of the coated area on the optical element in the region of the second interface to obtain an individual masking area in a predefined angular range, without requiring a change in the basic shape of the optical element. In this way, on the basis of a single basic form of an optical element by different printing and / or. Coating in the region of the second interface optical elements with different transmission angle characteristics can be produced. In particular, asymmetric angular characteristics can also be generated in this way on the basis of symmetrical basic shapes of the optical elements. In the case of excessive deviations from the symmetrical printing or coating, however, the return reflection into the entrance half space is reduced, especially as part of the radiation is also transmitted through the unprinted side areas of the optical element.
Die Erfindung wird nachstehend ohne Beschränkung des allgemeinen Erfindungsgedankens anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung exemplarisch beschrieben. Es zeigen:
- Fig. 1a, b
- Längsschnitt durch ein erfindungsgemäß ausgebildetes optische Element,
- Fig. 2
- Darstellung zum Stand der Technik,
- Fig. 3
- Darstellung zum Stand der Technik.
- Fig. 1a, b
- Longitudinal section through an optical element formed according to the invention,
- Fig. 2
- Representation of the prior art,
- Fig. 3
- Representation of the prior art.
In Figur 1a ist ein Längsschnitt durch vier nebeneinander angeordneten optische Elemente C dargestellt, gleichsam der Darstellung gemäß Figur 2 zum Stand der Technik. Wesentlich ist, das an den Seitenwandbereich des optischen Elemente C, der die erste Grenzfläche G1 darstellt, die zweite Grenzfläche G2 stetig anschließt. Die Grenzfläche G2 weist in sich eine stetige Krümmung auf und vermeidet jegliche Kanten, insbesondere im Nahtbereich zwischen der Grenzfläche G1 und Grenzfläche G2.In Figure 1a, a longitudinal section through four juxtaposed optical elements C is shown, as the representation of Figure 2 to the prior art. It is essential that the second interface G2 is continuously connected to the side wall region of the optical element C, which represents the first interface G1. The interface G2 has a continuous curvature in itself and avoids any edges, in particular in the seam area between the interface G1 and interface G2.
Zur optischen Ausblendung von Licht, das aus einem bestimmten Raumwinkelbereich B auf die Lichteintrittsseite A der optischen Elemente C einfällt (siehe Figur 2) ist die Grenzfläche G2 mit einer Beschichtung E bedeckt. Die Beschichtung kann derart reflektierend ausgebildet sein, so dass Lichtstrahlen, die innerhalb des optischen Elementes auf die Beschichtung in G1 auftreffen zurückreflektiert werden, so dass die aus dem Halbraum B in das optische Element eingekoppelten Lichtstrahlen wieder in diesen Halbraum austreten. Ist die Grenzfläche G2 ganzflächig, d. h. bis zur Schnittlinie I mit der Beschichtung E versehen, so ist sie optisch mit dem an sich bekannten optischen Element gemäß der vorstehend genannten deutschen Offenlegungsschrift gleichzusetzen. Durch die stetig gekrümmte Ausbildung der Grenzfläche G2 ist es jedoch auch möglich, die Beschichtung nur teilweise auf der Grenzfläche G2 vorzusehen und diese auf der Grenzfläche G2 individuell zu plazieren. In Figur 1b ist eine derartige Ausführungsform gezeigt, bei der durch Verschiebung des bedruckten oder beschichteten Bereiches E auf der Grenzfläche G2 eine entsprechende Asymmetrie dem optischen Element aufgezwungen ist. Hierdurch wird erreicht, dass der Ausblendbereich individuell eingestellt werden kann.For optical suppression of light incident on the light entrance side A of the optical elements C from a certain solid angle range B (see FIG. 2), the boundary surface G2 is covered with a coating E. The coating may be designed to be reflective, so that light rays that impinge on the coating in G1 within the optical element are reflected back, so that the light beams coupled into the optical element from the half space B emerge again into this half space. If the interface G2 over the entire surface, ie provided with the coating E up to the section line I, it is optically to be equated with the known optical element according to the aforementioned German patent application. Due to the continuously curved formation of the interface G2, however, it is also possible to provide the coating only partially on the interface G2 and to place it on the interface G2 individually. FIG. 1b shows such an embodiment, in which a corresponding asymmetry is imposed on the optical element by displacement of the printed or coated region E on the interface G2. This ensures that the Ausblendbereich can be set individually.
- AA
- LichteintrittsseiteLight entering side
- BB
- Eintrittshalbraum, RaumwinkelbereichEntry half space, solid angle range
- CC
- optisches Elementoptical element
- DD
- LichtsaustrittsseiteLight output side
- Ee
- Beschichtungcoating
- FF
- transluzente Gebäudefassadetranslucent building façade
- G1G1
- erste Grenzflächefirst interface
- G2G2
- zweite Grenzflächesecond interface
Claims (8)
- A device for deflecting and fading out light for stationary use in a translucent building façade for selective illumination of an interior space, the device having at least one translucent optical element (C) which is provided with a plane light entry side as well as a light exit side, which is delimited by a first curved boundary area (G1) and by at least one second boundary area (G2), with the curvature of the first boundary area with the curvature being formed in such a manner that the light rays impinging on the light entry side from a first solid angle region and coupling into the optical element are concentrated on the second boundary region (G2) by total reflection on the first boundary area and that the light rays impinging on the light entry side from a second solid angle region and coupling into the optical element (C) exit from the optical element (C) through the first boundary area,
wherein the second boundary area (G2) is also designed continuously curved and the first and the second boundary areas join seamlessly with continuous curvature behavior. - The device according to claim 1,
wherein the entire light exit area has a parabolic or a paraboloidal boundary area. - The device according to claim 1 or 2,
wherein an at least partly impervious-to-light layer (E) is at least partly applied in the region of the first and/or second boundary area or an at least partly impervious-to-light area is provided. - The device according to claim 3,
wherein the layer (E) is a reflecting or partly respectively completely light-absorbing layer. - The device according to claim 3,
wherein the at least partly impervious-to-light area is made opaque or impervious to light by means of abrading the boundary area. - The device according to one of the claims 1 to 5,
wherein a multiplicity of optical elements (C) are disposed side by side linearly or in an array-shaped manner in such a manner that the light entry sides of all the optical elements lie side by side in a plane adjoining seamlessly. - The device according to claim 6,
wherein the optical elements (C) have a common light entry side opposite which the light exit sides of the optical elements are provided. - The device according to claim 8,
wherein the multiplicity of the optical elements (C) are connected one-piece.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10053095 | 2000-10-26 | ||
| DE10053095A DE10053095A1 (en) | 2000-10-26 | 2000-10-26 | Device for redirecting and blanking light for stationary use in a translucent building facade for targeted lighting of an interior |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1201872A2 EP1201872A2 (en) | 2002-05-02 |
| EP1201872A3 EP1201872A3 (en) | 2003-08-27 |
| EP1201872B1 true EP1201872B1 (en) | 2006-05-24 |
Family
ID=7661129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01125174A Expired - Lifetime EP1201872B1 (en) | 2000-10-26 | 2001-10-23 | Device for redirecting light for room lighting |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1201872B1 (en) |
| AT (1) | ATE327404T1 (en) |
| DE (2) | DE10053095A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10231139C1 (en) * | 2002-07-10 | 2003-10-16 | Fraunhofer Ges Forschung | Sun blind with parallel slats, between double glazing glass panes, has compound parabolic concentrators fitted to the slat upper surfaces to reflect incoming light and give shade behind them |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4773733A (en) * | 1987-11-05 | 1988-09-27 | John A. Murphy, Jr. | Venetian blind having prismatic reflective slats |
| US5220462A (en) * | 1991-11-15 | 1993-06-15 | Feldman Jr Karl T | Diode glazing with radiant energy trapping |
| DE19613222A1 (en) | 1996-04-02 | 1997-10-09 | Fraunhofer Ges Forschung | Stationary device for shading the direct sunlight from glazing |
-
2000
- 2000-10-26 DE DE10053095A patent/DE10053095A1/en not_active Ceased
-
2001
- 2001-10-23 EP EP01125174A patent/EP1201872B1/en not_active Expired - Lifetime
- 2001-10-23 DE DE50109862T patent/DE50109862D1/en not_active Expired - Lifetime
- 2001-10-23 AT AT01125174T patent/ATE327404T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE10053095A1 (en) | 2002-05-16 |
| EP1201872A2 (en) | 2002-05-02 |
| DE50109862D1 (en) | 2006-06-29 |
| ATE327404T1 (en) | 2006-06-15 |
| EP1201872A3 (en) | 2003-08-27 |
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