EP0309832B1 - Lighting fixture - Google Patents
Lighting fixture Download PDFInfo
- Publication number
- EP0309832B1 EP0309832B1 EP88115223A EP88115223A EP0309832B1 EP 0309832 B1 EP0309832 B1 EP 0309832B1 EP 88115223 A EP88115223 A EP 88115223A EP 88115223 A EP88115223 A EP 88115223A EP 0309832 B1 EP0309832 B1 EP 0309832B1
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- EP
- European Patent Office
- Prior art keywords
- sheet metal
- shaped
- lamp
- louvre
- vane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
- F21V13/10—Combinations of only two kinds of elements the elements being reflectors and screens
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
- F21V11/02—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using parallel laminae or strips, e.g. of Venetian-blind type
Definitions
- the invention relates to a mirror luminaire for a rod-shaped lamp, in particular fluorescent tube, with longitudinal mirrors running parallel to the lamp on both sides and arranged transversely to it below the lamp, with the base of its double parabolic cross section aligned with the lamp, with the louvres on the louvres have a hat-shaped cover with reflecting surfaces along the length of its cross section along its length, and the cutting line of the cover with a plane running perpendicular to the longitudinal axis of the lamp has a concave curvature symmetrical to the longitudinal axis of the lamp.
- a mirror lamp of this type is known for example from the literature DE 31 12 210 C2.
- the hat-shaped cover here consists of a mirrored molded part, which is placed on the base of the grid lamella and increases in height from the middle of the grid lamella, starting from a central area. Undesired reflections on this cover can certainly be avoided with such a hat-shaped cover, but the effort required for this is considerable.
- the invention has for its object to provide a mirror luminaire of the type described in the introduction, a further solution for a louvre with a reflective hat-shaped cover, which, among other things, the luminance distribution to be set at office workstation lights, in particular the light distribution caused by the louvre slats shielding required here at a radiation angle ⁇ ⁇ 50 ° is not destroyed.
- the invention is based on the finding that the curved contour of the hat-shaped cover, which rises towards the edge in order to avoid undesirable reflections in the extension of a grid lamella, does not have to be designed continuously but can also be approximated in that, starting from a flat center piece, this flat center piece on both sides through a pyramid-shaped, each up to Slat edge-extending hat is complemented with flat side surfaces to the desired hat-shaped cover.
- This design achieves in an extremely advantageous manner that the louvre lamella, including this hat-shaped cover designed in this way, can be formed from a sheet metal part in a simple and cost-saving manner, that is to say that a special base-side attachment in the form of a mirrored molded part can be dispensed with.
- FIG. 1 shows two longitudinal mirrors LS with a parabolic contour, between which the rod-shaped lamp L, for example a fluorescent tube, is arranged in a symmetrical arrangement in the upper half.
- a flat roof mirror DS is provided above the lamp L, which e.g. can also be the inside of the lamp housing.
- Transverse louvres RL are arranged transversely to the longitudinal mirrors LS and anchored at their ends therein, which have a double parabolic wedge-like cross-section and are aligned on the foot side against the lamp.
- the grid louvres RL are provided on the foot side with a flat reflective cover A, which can be realized, for example, from the edge of the lamella walls LW bent into the horizontal on the foot side.
- the range ⁇ > 50 ° thus represents the shielding area of the luminaire, in which, if the BAP condition is to be met, the luminance is ⁇ 200 cd / m2.
- a critical light beam O is entered, which clarifies that the flat cover A of the grid slats RL on the foot side outside the central region can lead to the image of the image of the grid slats RL reflected on the foot flat cover Lamp L can emerge from the light opening of the lamp SL via multiple reflection in conjunction with the longitudinal mirrors LS at an angle ⁇ > 50 °. This destroys the desired shielding in the range ⁇ > 50 °.
- the image corresponding to FIG. 1 of the lamp SL according to FIG. 2 now uses a hat-shaped cover A in the form of a flat middle part MS instead of the flat cover of the grid louvres RL on the base, to which a four-sided, towards the respective longitudinal mirror LS is more open on both sides pyramid-shaped hat H connects.
- the section line shown in FIG. 2 of the contour of this hat-shaped cover with a plane perpendicular to the lamp axis represents an approximation to a concave curvature in the form of a parabola, which here, due to the angle of attack ⁇ of the flat middle piece MS continuing the flat middle piece MS on opposite sides, of the hats H is determined.
- the oblique sides H2 and H3 of the pyramid-shaped hats H also favor the emission of the light reflected from them via a few reflections from the lamp, without the lamp being shielded in the critical planes (C0-C180 and C90-C270) is significantly impaired.
- the special design of the base-side covering of the louvres RL from a flat middle piece MS and pyramid-shaped hats H, as shown in FIG. 2, allows the formation of the louvres RL including the hat-shaped cover from each in an extremely advantageous manner a single sheet metal part.
- FIG. 3 A first embodiment for such a sheet metal part BT1 is shown in FIG. 3. It has a shape symmetrical to the edge line KL forming the tip of the double parabolic cross section of the raster lamella RL and has three sheet metal sections at the free ends of the two lamella walls LW, one of which is from the middle sheet metal section, the flat middle piece MS and the hats H with the top side H1 and the oblique sides H2 and H3 are each formed from two sheet metal sections lying opposite one another.
- This gap SP enables the lamella walls LW in the resilient anchoring of the ends of the louvre slats RL in appropriately designed slots in the longitudinal mirrors LS according to FIG. 2 at their foot ends so that they can be moved towards each other elastically so that their edge-side anchoring in the slots mentioned the longitudinal mirror LS can be carried out easily and without the risk of deformation.
- the narrow gap SP causes a slight increase in the light losses which are inherently undesirable due to the louvres RL.
- the gap can be avoided if the two sheet metal sections forming the middle piece MS on the one hand and the sheet metal sections forming the upper side H1 on the other hand overlap slightly at the joint. As shown in Fig. 3, this can e.g. are brought about in that the three sheet metal sections adjoining a lamella wall LW are provided on one side with an extension VL indicated by dash-dotted lines. Of course, this extension VL can also be distributed over the three sheet metal sections on both opposite sides of the sheet metal part BT1, so that its contour is again symmetrical with the edge line KL.
- the grid lamella RL formed from the sheet metal part BT1 with the desired extension VL according to FIG. 3 is shown in perspective in FIG. 5.
- the overlapping joint running parallel to the edge line KL is indicated by ÜS.
- the gap can also be avoided if the contour of the sheet metal part to be formed to form the grid lamella RL with a hat-shaped cover, as shown by the sheet metal part BT2 according to FIG. 6, is symmetrical to the center line ML, which is perpendicular to that Point of the double parabolic cross-section forming edge line KL is aligned.
- the sheet metal sections provided for the formation of the two pyramid-shaped hats H are assigned to one half HE2, while the sheet metal section provided for the center piece MS of the cover is assigned to the other half HE1 is.
- raster lamella RL shows in perspective, here is the joint between the free end of the flat middle piece MS and the rear lamella wall LW on the one hand and the oblique sides H2 of the pyramid-shaped hats H and the front slat wall LW on the other hand moved into the transition with the slat walls LW.
- This shock does not cause any loss of light.
- the two lamella walls LW can spring against one another practically over the entire foot width of the double parabolic cross section.
- Mirror lights of the type described can be used as ceiling and recessed lights as well as pendant lights in offices, where, for example with regard to VDU workstations, special requirements must be placed on the light distribution.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Securing Globes, Refractors, Reflectors Or The Like (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Spiegelleuchte für eine stabförmige Lampe, insbesondere Leuchtstoffröhre, mit parallel zur Lampe auf beiden Seiten verlaufenden Längsspiegeln und quer dazu unterhalb der Lampe angeordneten, mit dem Fuß ihres doppelparabol förmigen Querschnitts gegen die Lampe ausgerichteten Rasterlamellen, bei der die Rasterlamellen auf der Fußseite ihres Querschnitts über ihre Länge hinweg eine hutförmige Abdeckung mit reflektierenden Oberflächen aufweisen und hierbei die Schnittlinie der Abdeckung mit einer senkrecht zur Lampenlängsachse verlaufenden Ebene eine zur Lampenlängsachse symmetrische konkave Krümmung aufweist.The invention relates to a mirror luminaire for a rod-shaped lamp, in particular fluorescent tube, with longitudinal mirrors running parallel to the lamp on both sides and arranged transversely to it below the lamp, with the base of its double parabolic cross section aligned with the lamp, with the louvres on the louvres have a hat-shaped cover with reflecting surfaces along the length of its cross section along its length, and the cutting line of the cover with a plane running perpendicular to the longitudinal axis of the lamp has a concave curvature symmetrical to the longitudinal axis of the lamp.
Eine Spiegelleuchte dieser Art ist beispielsweise durch die Literaturstelle DE 31 12 210 C2 bekannt. Die hutförmige Abdeckung besteht hier aus einem verspiegelten Spritzteil, das fußseitig auf die Rasterlamelle aufgesetzt ist und in Erstreckung der Rasterlamelle, ausgehend von einem mittleren Bereich, zum Lamellenrand hin an Höhe zunimmt. Mit einer solchen hutförmigen Abdeckung lassen sich zwar unterwünschte Reflexionen an dieser Abdeckung mit Sicherheit vermeiden, doch ist der hierfür erforderliche Aufwand erheblich.A mirror lamp of this type is known for example from the literature DE 31 12 210 C2. The hat-shaped cover here consists of a mirrored molded part, which is placed on the base of the grid lamella and increases in height from the middle of the grid lamella, starting from a central area. Undesired reflections on this cover can certainly be avoided with such a hat-shaped cover, but the effort required for this is considerable.
Beispielsweise durch die Literaturstelle GB-A-814,354 sind spiegelnde Abdeckungen von Rasterlamellen bekannt, die ebenfalls fußseitig auf die Rasterlamellen aufgesetzt werden und in ihrem Querschnitt eben, dreieckförmig oder bogenförmig gewölbt sein können. Bei Spiegelleuchten, für die bei Austrahlungswinkeln γ ≧ 50° eine Leuchtdichte ≦ 200cd/m² sogenannte "BAP-Bedingung", gefordert wird, läßt sich diese Forderung nicht in jedem Fall mit Sicherheit gewährleisten. Die fußseitige reflektierende Abdeckung der Rasterlamellen kann in diesem Fall nicht verhindern, daß das Bild der Lampe durch Mehrfachreflexion unter einem Winkel von γ > 50° aus der Leuchte austritt, d.h. die Lampe aufblitzen läßt. Besonders kritisch sind in diesem Zusammenhang in Erstreckung der Rasterlamellen Abdeckungsabschnitte im Randbereich der Rasterlamellen, während im mittleren Bereich auch bei ebener Abdeckung die Anforderungen oft noch erfüllt sind.For example, from the literature reference GB-A-814,354 reflecting covers of louvres are known, which are also placed on the base of the louvres and can be flat, triangular or arched in cross-section. For mirror luminaires, for which a luminance ≦ 200cd / m² is known at beam angles γ ≧ 50 ° "BAP condition" is required, this requirement cannot be guaranteed with certainty in every case. In this case, the reflective covering of the louvre blades on the foot side cannot prevent the image of the lamp from emerging from the lamp due to multiple reflection at an angle of γ> 50 °, that is to say the lamp flashing. Cover sections in the edge region of the grid slats are particularly critical in this connection in the extension of the grid slats, while the requirements are often still met in the middle area even with a flat cover.
Um diese Randbereiche zu entschärfen, ist es daher, wie das bei der Spiegelleuchte nach der erstgenannten Literaturstelle der Fall ist, erforderlich, die fußsseitige spiegelnde Abdeckung in den erwähnten Randbereichen der Rasterlamelle über deren Fußhöhe hinaus anzuheben.In order to defuse these edge areas, it is therefore necessary, as is the case with the mirror lamp according to the first-mentioned literature reference, to raise the reflective cover on the foot side in the mentioned edge areas of the louvre lamella above their foot height.
Der Erfindung liegt die Aufgabe zugrunde, für eine Spiegelleuchte der einleitend beschriebenen Art eine weitere Lösung für eine Rasterlamelle mit einer reflektierenden hutförmigen Abdeckung anzugeben, die bei möglichst geringen der durch die Rasterlamellen verursachten Lichtverluste unter anderem auch die an Büroarbeitsplatzleuchten zu stellende Leuchtdichteverteilung erfüllt, insbesondere die hier bei einem Ausstrahlungswinkel γ ≧ 50° zu fordernde Abschirmung nicht zerstört.The invention has for its object to provide a mirror luminaire of the type described in the introduction, a further solution for a louvre with a reflective hat-shaped cover, which, among other things, the luminance distribution to be set at office workstation lights, in particular the light distribution caused by the louvre slats shielding required here at a radiation angle γ ≧ 50 ° is not destroyed.
Diese Aufgabe wird gemäß der Erfindung durch die im Patentanspruch 1 angegebenen Merkmale gelöst.This object is achieved according to the invention by the features specified in
Der Erfindung liegt die Erkenntnis zugrunde, daß die zur Vermeidung unerwünschter Reflexionen in Erstreckung einer Rasterlamelle zum Rand hin ansteigende gekrümmte Kontur der hutförmigen Abdeckung nicht kontinuierlich gestaltet sein muß sondern auch dadurch angenähert werden kann, daß ausgehend von einem flachen Mittelstück dieses flache Mittelstück auf beiden Seiten durch einen pyramidförmigen, sich jeweils bis zum Lamellenrand erstreckenden Hut mit jeweils flachen Seitenflächen zur gewünschten hutförmigen Abdeckung ergänzt wird.The invention is based on the finding that the curved contour of the hat-shaped cover, which rises towards the edge in order to avoid undesirable reflections in the extension of a grid lamella, does not have to be designed continuously but can also be approximated in that, starting from a flat center piece, this flat center piece on both sides through a pyramid-shaped, each up to Slat edge-extending hat is complemented with flat side surfaces to the desired hat-shaped cover.
Durch diese Formgebung wird in außerordentlich vorteilhafter Weise erreicht, daß die Rasterlamelle einschließlich dieser so gestalteten hutförmigen Abdeckung auf einfache und kostensparende Weise aus einem Blechteil formbar ist, also auf einen speziellen fußseitigen Aufsatz in Form eines verspiegelten Spritzteils verzichtet werden kann.This design achieves in an extremely advantageous manner that the louvre lamella, including this hat-shaped cover designed in this way, can be formed from a sheet metal part in a simple and cost-saving manner, that is to say that a special base-side attachment in the form of a mirrored molded part can be dispensed with.
Zweckmäßige Ausgestaltungen des Gegenstandes nach dem Patentanspruch 1 sind in den weiteren Patentansprüchen 2 und 3 angegeben.Advantageous embodiments of the subject matter according to
In der Zeichnung bedeuten die der näheren Erläuterung der Erfindung dienenden Figuren
- Fig. 1
- die Darstellung einer Spiegelleuchte mit Rasterlamellen, die fußseitig eine reflektierende ebene Abdeckung aufweisen,
- Fig. 2
- die modifizierte Spiegelleuchte nach Fig. 1 mit einer eine hutförmigen Abdeckung aufweisenden, aus einem Blechteil hergestellten Rasterlamellen,
- Fig. 3
- eine erste Ausführungsform eines Blechteils für die Formung einer Rasterlamelle einschließlich hutförmiger Abdeckung,
- Fig. 4
- die aus dem Blechteil nach Fig. 3 geformte Rasterlamelle mit hutförmiger Abdeckung in perspektivischer Darstellung,
- Fig. 5
- die aus einer Variante des Blechteils nach Fig. 3 geformte Rasterlamelle mit hutförmiger Abdeckung in perspektivischer Darstellung,
- Fig. 6
- eine zweite Ausführungsform eines Blechteils für die Formung einer Rasterlamelle einschließlich hutförmiger Abdeckung,
- Fig. 7
- eine aus einem Blechteil nach Fig. 6 geformte Rasterlamelle einschließlich hutförmiger Abdeckung in perspektivischer Darstellung.
- Fig. 1
- the representation of a mirror lamp with louvre slats, which have a reflective flat cover on the foot,
- Fig. 2
- 1 with a hat-shaped cover, made of a sheet metal part raster lamellae,
- Fig. 3
- a first embodiment of a sheet metal part for forming a grid lamella including hat-shaped cover,
- Fig. 4
- 3 with a hat-shaped cover in a perspective view,
- Fig. 5
- 3 made of a variant of the sheet metal part according to FIG. 3 with a hat-shaped cover in a perspective view,
- Fig. 6
- A second embodiment of a sheet metal part for forming a grid lamella including hat-shaped cover,
- Fig. 7
- a formed from a sheet metal part according to FIG. 6 grid lamella including hat-shaped cover in perspective Presentation.
Die Spiegelleuchte SL nach Fig. 1 zeigt zwei Längsspiegel LS mit parabolischer Kontur, zwischen denen in symmetrischer Anordnung in der oberen Hälfte die stabförmige Lampe L, beispielsweise eine Leuchtstoffröhre, angeordnet ist. Oberhalb der Lampe L ist ein ebener Dachspiegel DS vorgesehen, welcher z.B. auch die Leuchtengehäuseinnenseite sein kann. Quer zu den Längsspiegeln LS und an ihren Enden hierin verankert sind Rasterlamellen RL angeordnet, die einen doppelparabolförmigen keilartigen Querschnitt aufweisen und fußseitig gegen die Lampe ausgerichtet sind. Die Rasterlamellen RL sind fußseitig mit einer ebenen reflektierenden Abdeckung A versehen, die beispielsweise aus dem fußseitig in die Horizontale abgebogenen Rand der Lamellenwände LW verwirklicht sein kann.1 shows two longitudinal mirrors LS with a parabolic contour, between which the rod-shaped lamp L, for example a fluorescent tube, is arranged in a symmetrical arrangement in the upper half. A flat roof mirror DS is provided above the lamp L, which e.g. can also be the inside of the lamp housing. Transverse louvres RL are arranged transversely to the longitudinal mirrors LS and anchored at their ends therein, which have a double parabolic wedge-like cross-section and are aligned on the foot side against the lamp. The grid louvres RL are provided on the foot side with a flat reflective cover A, which can be realized, for example, from the edge of the lamella walls LW bent into the horizontal on the foot side.
Die Abmessungen der Spiegelleuchte SL sind so gewählt, daß die den unteren Rand eines Längsspiegels LS gerade berührende Tangente T an die Lampe L einen Abschirmwinkel α = 40° aufweist. Auf diese Weise wird sichergestellt, daß ein direktes Bild der Lampe L in einem Ausstrahlungswinkel γ > 50° nicht mehr wahrgenommen werden kann. Der Bereich γ > 50° stellt bei entsprechend ausgelegter Kontur des Längsspiegels LS und der Rasterlamellen RL somit den Abschirmbereich der Leuchte dar, in dem, sofern hier die BAP-Bedingung erfüllt werden soll, die Leuchtdichte ≦ 200 cd/m² beträgt.The dimensions of the mirror lamp SL are chosen so that the tangent T just touching the lower edge of a longitudinal mirror LS to the lamp L has a shielding angle α = 40 °. This ensures that a direct image of the lamp L can no longer be perceived at a radiation angle γ> 50 °. With a correspondingly designed contour of the longitudinal mirror LS and the grid louvres RL, the range γ> 50 ° thus represents the shielding area of the luminaire, in which, if the BAP condition is to be met, the luminance is ≦ 200 cd / m².
In der Darstellung der Leuchte nach Fig. 1 ist ein kritischer Lichtstrahl O eingetragen, der verdeutlicht, daß die fußseitige ebene Abdeckung A der Rasterlamellen RL außerhalb des Mittenbereichs dazu führen kann, daß das Bild der an der fußseitigen ebenen Abdeckung der Rasterlamellen RL reflektierte Bild der Lampe L über eine Mehrfachreflexion in Verbindung mit den Längsspiegeln LS unter einem Winkel γ > 50° aus der Lichtöffnung der Leuchte SL austreten kann. Hierdurch wird die gewünschte Abschirmung im Bereich γ > 50° zerstört.In the illustration of the lamp according to FIG. 1, a critical light beam O is entered, which clarifies that the flat cover A of the grid slats RL on the foot side outside the central region can lead to the image of the image of the grid slats RL reflected on the foot flat cover Lamp L can emerge from the light opening of the lamp SL via multiple reflection in conjunction with the longitudinal mirrors LS at an angle γ> 50 °. This destroys the desired shielding in the range γ> 50 °.
Das Fig. 1 entsprechende Bild der Leuchte SL nach Fig. 2 verwendet nun anstelle der fußseitigen ebenen Abdeckung der Rasterlamellen RL eine hutförmige Abdeckung A in Form eines flachen Mittelteils MS, an das sich auf beiden Seiten ein vierseitiger, zum jeweils nahen Längsspiegel LS hin offener pyramidförmiger Hut H anschließt. Die in Fig. 2 dargestellte Schnittlinie der Kontur dieser hutförmigen Abdeckung mit einer Ebene senkrecht zur Lampenachse stellt eine Annäherung an eine konkave Krümmung in Form einer Parabel dar, die hierbei durch den Anstellwinkel ε der auf gegenüberliegenden Seiten das plane Mittelstück MS fortsetztenden Oberseiten H1 der Hüte H bestimmt ist. Die Schrägseiten H2 und H3 der pyramidförmigen Hüte H, von denen lediglich die Schrägseite H2 in Fig. 2 sichtbar ist, begünstigen ebenfalls die Abstrahlung des an ihnen reflektierten Lichts über wenige Reflexionen aus der Leuchte heraus, ohne daß die Abschirmung der Leuchte in den kritischen Ebenen (C0-C180 und C90-C270) wesentlich beeinträchtigt wird.The image corresponding to FIG. 1 of the lamp SL according to FIG. 2 now uses a hat-shaped cover A in the form of a flat middle part MS instead of the flat cover of the grid louvres RL on the base, to which a four-sided, towards the respective longitudinal mirror LS is more open on both sides pyramid-shaped hat H connects. The section line shown in FIG. 2 of the contour of this hat-shaped cover with a plane perpendicular to the lamp axis represents an approximation to a concave curvature in the form of a parabola, which here, due to the angle of attack ε of the flat middle piece MS continuing the flat middle piece MS on opposite sides, of the hats H is determined. The oblique sides H2 and H3 of the pyramid-shaped hats H, of which only the oblique side H2 is visible in FIG. 2, also favor the emission of the light reflected from them via a few reflections from the lamp, without the lamp being shielded in the critical planes (C0-C180 and C90-C270) is significantly impaired.
In Fig. 2 sind fünf Lichtstrahlen 1, 2, 3, 4 und 5 eingezeichnet, die diesen Sachverhalt verdeutlichen und keiner näheren Erläuterung bedürfen.In Fig. 2, five
Wie schon darauf hingewiesen worden ist, gestattet die spezielle Gestaltung der fußseitigen Abdeckung der Rasterlamellen RL aus flachem Mittelstück MS und pyramidförmigen Hüten H, wie sie in Fig. 2 dargestellt ist, in außerordentlich vorteilhafter Weise die Formung der Rasterlamellen RL einschließlich der hutförmigen Abdeckung aus jeweils einem einzigen Blechteil.As has already been pointed out, the special design of the base-side covering of the louvres RL from a flat middle piece MS and pyramid-shaped hats H, as shown in FIG. 2, allows the formation of the louvres RL including the hat-shaped cover from each in an extremely advantageous manner a single sheet metal part.
Eine erste Ausführung für ein solches Blechteil BT1 zeigt Fig. 3. Es hat eine zu der die Spitze des doppelparabolförmigen Querschnitts der Rasterlamelle RL bildenden Kantenlinie KL symmetrische Gestalt und weist an den freien Enden der beiden Lamellenwände LW jeweils drei Blechabschnitte auf, von denen aus dem mittleren Blechabschnitt das flache Mittelstück MS und jeweils aus zwei einander gegenüberliegenden randseitigen Blechabschnitten die Hüte H mit der Oberseite H1 und den Schrägseiten H2 und H3 geformt werden.A first embodiment for such a sheet metal part BT1 is shown in FIG. 3. It has a shape symmetrical to the edge line KL forming the tip of the double parabolic cross section of the raster lamella RL and has three sheet metal sections at the free ends of the two lamella walls LW, one of which is from the middle sheet metal section, the flat middle piece MS and the hats H with the top side H1 and the oblique sides H2 and H3 are each formed from two sheet metal sections lying opposite one another.
Die aus dem Blechteil BT1 nach Fig. 3 geformte Rasterlamelle RL einschließlich ihrer hutseitigen Abdeckung, die in Fig. 4 perspektivisch dargestellt ist, läßt erkennen, daß der parallel zur Kantenlinie KL verlaufende Stoß in der hutseitigen Abdeckung zu einem schmalen Spalt SP erweitert ist. Dieser Spalt SP ermöglicht es den Lamellenwänden LW bei der federnden Verankerung der Enden der Rasterlamellen RL in entsprechend gestalteten Schlitzen in den Längsspiegeln LS nach Fig. 2 an ihren fußseitigen Enden so weit elastisch aufeinander zu bewegt werden können, daß ihre randseitige Verankerung in den erwähnten Schlitzen der Längsspiegel LS leicht und ohne die Gefahr einer Verformung durchgeführt werden kann.The raster lamella RL formed from the sheet metal part BT1 according to FIG. 3, including its hat-side cover, which is shown in perspective in FIG. 4, shows that the joint running parallel to the edge line KL in the hat-side cover is widened to a narrow gap SP. This gap SP enables the lamella walls LW in the resilient anchoring of the ends of the louvre slats RL in appropriately designed slots in the longitudinal mirrors LS according to FIG. 2 at their foot ends so that they can be moved towards each other elastically so that their edge-side anchoring in the slots mentioned the longitudinal mirror LS can be carried out easily and without the risk of deformation.
Der schmale Spalt SP bedingt eine geringfügige Vergrößerung der an sich unerwünschten durch die Rasterlamellen RL bedingten Lichtverluste.The narrow gap SP causes a slight increase in the light losses which are inherently undesirable due to the louvres RL.
Der Spalt läßt sich vermeiden, wenn sich die das Mittelstück MS bildenden beiden Blechabschnitte einerseits und die die Oberseite H1 bildenden Blechabschnitte andererseits an der Stoßstelle geringfügig überlappen. Wie Fig. 3 zeigt, kann dies z.B. dadurch herbeigeführt werden, daß auf einer Seite die drei an eine Lamellenwand LW angrenzenden Blechabschnitte mit einer strichpunktiert angegebenen Verlängerung VL versehen werden. Selbstverständlich kann diese Verlängerung VL auch auf die drei Blechabschnitte auf beiden einander gegenüberliegenden Seiten des Blechteils BT1 verteilt sein, so daß dessen Kontur wiederum zur Kantenlinie KL symmetrisch ist.The gap can be avoided if the two sheet metal sections forming the middle piece MS on the one hand and the sheet metal sections forming the upper side H1 on the other hand overlap slightly at the joint. As shown in Fig. 3, this can e.g. are brought about in that the three sheet metal sections adjoining a lamella wall LW are provided on one side with an extension VL indicated by dash-dotted lines. Of course, this extension VL can also be distributed over the three sheet metal sections on both opposite sides of the sheet metal part BT1, so that its contour is again symmetrical with the edge line KL.
Die aus dem Blechteil BT1 mit der erwünschten Verlängerung VL nach Fig. 3 geformte Rasterlamelle RL ist in Fig. 5 perspektivisch dargestellt. Der parallel zur Kantenlinie KL verlaufende überlappende Stoß ist hierbei mit ÜS angegeben.The grid lamella RL formed from the sheet metal part BT1 with the desired extension VL according to FIG. 3 is shown in perspective in FIG. 5. The overlapping joint running parallel to the edge line KL is indicated by ÜS.
Der Spalt läßt sich ebenfalls vermeiden, wenn die Kontur des zur Rasterlamelle RL mit hutförmiger Abdeckung zu formenden Blechteils, wie das das Blechteil BT2 nach Fig. 6 zeigt, symmetrisch zur Mittellinie ML ist, die senkrecht zu der die Spitze des doppelparabolförmigen Querschnitts bildenden Kantenlinie KL ausgerichtet ist. Hierbei sind, bezogen auf die das Blechteil BT2 in zwei Hälften HE1 und HE2 unterteilenden Kantenlinie KL die für die Ausformung der beiden pyramidförmigen Hüte H vorgesehenen Blechabschnitte der einen Hälfte HE2 zugeordnet, während der für das Mittelstück MS der Abdeckung vorgesehene Blechabschnitt der anderen Hälfte HE1 zugeordnet ist.The gap can also be avoided if the contour of the sheet metal part to be formed to form the grid lamella RL with a hat-shaped cover, as shown by the sheet metal part BT2 according to FIG. 6, is symmetrical to the center line ML, which is perpendicular to that Point of the double parabolic cross-section forming edge line KL is aligned. In this case, based on the edge line KL dividing the sheet metal part BT2 into two halves HE1 and HE2, the sheet metal sections provided for the formation of the two pyramid-shaped hats H are assigned to one half HE2, while the sheet metal section provided for the center piece MS of the cover is assigned to the other half HE1 is.
Wie die in Fig. 7 aus einem solchen Blechteil BT2 nach Fig. 6 geformte Rasterlamelle RL in perspektivischer Sicht zeigt, ist hier der Stoß zwischen dem freien Ende des flachen Mittelstücks MS und der hinteren Lamellenwand LW einerseits sowie der Schrägseiten H2 der pyramidförmigen Hüte H und der vorderen Lamellenwand LW andererseits in den Übergang mit den Lamellenwänden LW verschoben. Dieser Stoß bedingt keine Lichtverluste. Außerdem ist es bei dieser Ausführungsform möglich, daß die beiden Lamellenwände LW praktisch über die gesamte Fußbreite des doppelparabolförmigen Querschnitts gegeneinander federn können.As shown in Fig. 7 from such a sheet metal part BT2 according to Fig. 6 raster lamella RL shows in perspective, here is the joint between the free end of the flat middle piece MS and the rear lamella wall LW on the one hand and the oblique sides H2 of the pyramid-shaped hats H and the front slat wall LW on the other hand moved into the transition with the slat walls LW. This shock does not cause any loss of light. In addition, in this embodiment it is possible that the two lamella walls LW can spring against one another practically over the entire foot width of the double parabolic cross section.
Spiegelleuchten der beschriebenen Art können als Deckenan- und Einbauleuchten sowie als Pendelleuchten in Büroräumen zum Einsatz kommen, wo, beispielsweise im Hinblick auf Bildschirmarbeitsplätze, besondere Anforderungen an die Lichtverteilung gestellt werden müssen.Mirror lights of the type described can be used as ceiling and recessed lights as well as pendant lights in offices, where, for example with regard to VDU workstations, special requirements must be placed on the light distribution.
Claims (6)
- Mirror lighting unit for a rod-shaped lamp (L), especially a fluorescent tube, having longitudinal mirrors (LS) extending on both sides parallel to the lamp, and louvre vanes (RL) arranged transversely thereto underneath the lamp (L) and adjusted relative to the lamp with the base of their double-parabola-shaped cross-section, wherein all along their length the louvre vanes have a hood-shaped cover (A) with reflecting surfaces on the base side of their cross-section, and with the line of intersection of the cover with a plane extending perpendicular to the longitudinal axis of the lamp having a concave curvature symmetrical in relation to the longitudinal axis of the lamp, characterised in that for simple manufacture of the louvre vanes (RL) including their hood-shaped cover, from in each case one sheet metal part (BT1, BT2) capable of being shaped, the concave curvature of the line of intersection of the hood-shaped cover is approximated with a flat central part (MS) which merges on both sides into a four-sided pyramid-shaped hood (H) open towards the respectively adjacent longitudinal mirror (LS) and in that the angle of pitch (ε) of the slant upper sides (H1) of the pyramid-shaped hoods, which continue the flat central part on opposite sides, is dimensioned so as to approximate the course of the resultant surface line of interaction to a parabola.
- Mirror lighting unit according to Claim 1, characterised in that the sheet metal part (BT1), from which the louvre vane (RL) can be formed together with the hood-shaped cover, has two identical sheet metal sections with a common ridge (KL) which represent the vane walls (LW), to which sheet metal sections adjoin on the sides opposite their common ridge further sheet metal sections which serve jointly to shape the central part (MS) and the hoods (H) bordering on the central part on both sides and consisting in each case of the upper side (H1) and the two laterally arranged slant sides (H2, H3).
- Mirror lighting unit according to Claims 1 and 2, characterised in that the joint produced when the sheet metal part (BT1) is shaped and present in the hood-shaped cover along the louvre vane (RL) takes the form of a narrow groove (SP), the width of which is dimensioned so as to provide an adequate base-side compression spring extension of the vane walls (LW) which serves to anchor the louvre vane flexibly in the longitudinal mirrors (LS).
- Mirror lighting unit according to Claims 1 and 2, characterised in that the joint produced when the sheet metal part (BT1) is shaped and present in the hood-shaped cover along the louvre vane (RL) takes the form of an overlapping joint (ÜS).
- Mirror Lighting unit according to one of the preceding claims, characterised in that the contour of the sheet metal part (BT1), from which the louvre vane (RL) with hood-shaped cover can be shaped, is symmetrical to the ridge (KL) forming the peak of the double-parabola-shaped cross-section of the louvre vane.
- Mirror lighting unit according to Claims 1 and 2, characterised in that in the case of the sheet metal part (BT2) of the further sheet metal sections adjoining the vane walls (LW) at the sides opposite their common ridge (KL) the sheet metal section representing the central part (MS) borders on one of the vane walls and the sheet metal parts providing the hoods (H), that is to say in each case one upper side (H1) and two slants sides (H2, H3), border on the other vane wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88115223T ATE72892T1 (en) | 1987-09-28 | 1988-09-16 | MIRROR LAMP. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3732610 | 1987-09-28 | ||
| DE3732610 | 1987-09-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0309832A1 EP0309832A1 (en) | 1989-04-05 |
| EP0309832B1 true EP0309832B1 (en) | 1992-02-26 |
Family
ID=6337031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88115223A Expired - Lifetime EP0309832B1 (en) | 1987-09-28 | 1988-09-16 | Lighting fixture |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4888668A (en) |
| EP (1) | EP0309832B1 (en) |
| AT (1) | ATE72892T1 (en) |
| DE (1) | DE3868577D1 (en) |
| NO (1) | NO175606C (en) |
| ZA (1) | ZA887193B (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3932935A1 (en) * | 1989-10-03 | 1991-04-11 | Zumtobel Ag | LIGHT GRID |
| NL9402049A (en) * | 1994-12-06 | 1996-07-01 | Etap Nv | Lighting fixture |
| HU214621B (en) * | 1995-02-14 | 1998-04-28 | Koninklijke Philips Electronics N.V. | Luminaire |
| US5528478A (en) * | 1995-10-04 | 1996-06-18 | Cooper Industries, Inc. | Lighting fixture having a parabolic louver |
| USD377231S (en) * | 1996-03-19 | 1997-01-07 | Cooper Industries, Inc. | Luminaire |
| DE69720408T2 (en) * | 1996-10-08 | 2004-02-12 | Koninklijke Philips Electronics N.V. | LIGHTING APPARATUS |
| SE9701216L (en) * | 1997-04-04 | 1998-04-27 | Fagerhults Ab | Methods of producing an aperture cover, a reflector or the like for an electric lighting fixture and an aperture cover, a reflector or the like, manufactured according to the method |
| NL1007835C2 (en) * | 1997-12-18 | 1999-06-21 | Veco Products B V | Housing for strip light |
| DE19916601C2 (en) * | 1999-04-13 | 2002-08-01 | Siteco Beleuchtungstech Gmbh | Slat, luminaire grid for glare control and luminaire |
| HUP0204206A2 (en) * | 2000-02-29 | 2003-04-28 | Lt Licht Technik Gmbh | Reflector arrangement for a lamp |
| ATE468511T1 (en) * | 2001-02-23 | 2010-06-15 | Koninkl Philips Electronics Nv | LAMP |
| US20050168986A1 (en) * | 2004-01-30 | 2005-08-04 | Scott Wegner | Reflector assemblies for luminaires |
| US7209577B2 (en) | 2005-07-14 | 2007-04-24 | Logitech Europe S.A. | Facial feature-localized and global real-time video morphing |
| US20080178903A1 (en) * | 2007-01-25 | 2008-07-31 | Timothy Thorpe | Rotating Sifter |
| US8006707B2 (en) * | 2008-01-29 | 2011-08-30 | Hct Asia Ltd. | Rotating dial sifter |
| EP3193661A4 (en) | 2014-09-18 | 2018-04-04 | HCT Group Holding Limited | Container with quick release base and lid assembly |
| US9993059B2 (en) | 2015-07-10 | 2018-06-12 | HCT Group Holdings Limited | Roller applicator |
| USD786088S1 (en) | 2015-07-10 | 2017-05-09 | HCT Group Holdings Limited | Angled pump with depression |
| USD784162S1 (en) | 2015-10-08 | 2017-04-18 | HCT Group Holdings Limited | Tottle |
| USD818641S1 (en) | 2016-03-16 | 2018-05-22 | HCT Group Holdings Limited | Cosmetics applicator with cap |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB814354A (en) * | 1956-09-19 | 1959-06-03 | Leitz Ernst Gmbh | Improvements in or relating to reflector arrangements for elongated tubular light sources |
| US3591798A (en) * | 1968-11-04 | 1971-07-06 | Lightolier Inc | Lighting fixture |
| US4407011A (en) * | 1980-12-08 | 1983-09-27 | Donn Incorporated | Integrated lighting systems for suspended ceilings or the like |
| DE3112210C2 (en) * | 1981-03-27 | 1985-01-10 | Siemens AG, 1000 Berlin und 8000 München | Mirror light |
| DE3215026A1 (en) * | 1982-04-22 | 1984-03-15 | Thorn Emi Beleuchtungsgesellschaft mbH, 5760 Arnsberg | Lighting fixture |
| US4429354A (en) * | 1982-09-29 | 1984-01-31 | Emerson Electric Co. | Lighting fixture louver |
| DE8307931U1 (en) * | 1983-03-18 | 1983-07-21 | Trilux-Lenze Gmbh + Co Kg, 5760 Arnsberg | LUMINAIRE GRID FOR A LONG ELASTIC LAMP |
| AT381577B (en) * | 1983-04-08 | 1986-11-10 | Bartenbach Christian | GLARE-FREE LAMP FOR A ROD-SHAPED LIGHT SOURCE |
| US4494175A (en) * | 1984-01-09 | 1985-01-15 | Gte Products Corporation | Recessed lighting fixture with improved louver mounting |
| DE8702921U1 (en) * | 1987-02-25 | 1987-07-30 | Metaprint Metallverarbeitung GmbH, 8000 München | lamp |
-
1988
- 1988-09-14 US US07/244,163 patent/US4888668A/en not_active Expired - Fee Related
- 1988-09-16 DE DE8888115223T patent/DE3868577D1/en not_active Expired - Lifetime
- 1988-09-16 AT AT88115223T patent/ATE72892T1/en not_active IP Right Cessation
- 1988-09-16 EP EP88115223A patent/EP0309832B1/en not_active Expired - Lifetime
- 1988-09-26 ZA ZA887193A patent/ZA887193B/en unknown
- 1988-09-27 NO NO884276A patent/NO175606C/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ATE72892T1 (en) | 1992-03-15 |
| US4888668A (en) | 1989-12-19 |
| NO884276D0 (en) | 1988-09-27 |
| NO884276L (en) | 1989-03-29 |
| NO175606C (en) | 1994-11-02 |
| ZA887193B (en) | 1989-06-28 |
| EP0309832A1 (en) | 1989-04-05 |
| DE3868577D1 (en) | 1992-04-02 |
| NO175606B (en) | 1994-07-25 |
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