EP0286890B1 - Screen for a fluorescent-light fitting - Google Patents

Screen for a fluorescent-light fitting Download PDF

Info

Publication number
EP0286890B1
EP0286890B1 EP88104820A EP88104820A EP0286890B1 EP 0286890 B1 EP0286890 B1 EP 0286890B1 EP 88104820 A EP88104820 A EP 88104820A EP 88104820 A EP88104820 A EP 88104820A EP 0286890 B1 EP0286890 B1 EP 0286890B1
Authority
EP
European Patent Office
Prior art keywords
transverse
lamina
longitudinal
sections
groove
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
Application number
EP88104820A
Other languages
German (de)
French (fr)
Other versions
EP0286890A2 (en
EP0286890A3 (en
Inventor
Georg Ing. Kempter
Siegfried Dipl.-Ing. Höfle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zumtobel AG
Original Assignee
Zumtobel AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zumtobel AG filed Critical Zumtobel AG
Publication of EP0286890A2 publication Critical patent/EP0286890A2/en
Publication of EP0286890A3 publication Critical patent/EP0286890A3/en
Application granted granted Critical
Publication of EP0286890B1 publication Critical patent/EP0286890B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Definitions

  • the invention relates to a grid for fluorescent lamp lights with longitudinal slats and transverse slats arranged at right angles thereto according to the preamble of claim 1.
  • Grids of this type are known from AT-PS 379 228 and also DE-GM 85 08 740 shows a similar construction.
  • the lamellas of this grid have smooth reflecting surfaces over their height and the embossed groove provided at the front end of the transverse lamella positively takes on the edge of the cutout of the longitudinal lamella, on the one hand making the grid as a whole more stable and on the other hand preventing these "seams" from being prevented a gap is formed through which the light emitted by the lamp can fall.
  • the longitudinal and transverse lamellas of such grids are made of thin aluminum sheets and the grid as a whole is a very unstable component, in which internal stresses result from mechanical stress as well as thermal expansion, which lead to, even if only small, deformations that the formation of gaps at the "seams" mentioned cannot be ruled out unless appropriate countermeasures are taken. Through such gaps, the light emitted by the lamp can fall outside. This can lead to effects that the viewer finds annoying.
  • precautions have been successfully taken with the known constructions mentioned above, but the slats used for these grids are those which have a smooth reflecting surface over their entire height.
  • the invention now proposes that those measures be taken with a grid of the type mentioned at the beginning of the characterizing part of claim 1. Despite the surfaces of the slats designed in this way the edge of the incision of the longitudinal lamella can be accommodated in such a way that a gap is avoided and so no light falls outwards in an uncontrolled manner.
  • FIG. 1 shows a grid seen from below
  • Fig. 2 shows the grid of Figure 1, seen obliquely from below
  • Figure 3 shows the front end of a transverse lamella in view
  • 4 shows a cross section along the line IV - IV in Fig. 3.
  • 5 shows the end of a transverse lamella according to FIG. 3, but on an enlarged scale compared to this figure and in an oblique view
  • Fig. 6 shows a longitudinal section through the groove at the front end of the transverse lamella and on a significantly enlarged scale compared to Fig. 3.
  • FIG. 1 and 2 illustrate a simple grid for a single-lamp fluorescent lamp, with FIG. 1 showing a partial bottom view.
  • This grid consists of two mutually parallel and spaced apart longitudinal slats 1. These two longitudinal slats 1 are now connected to one another by a plurality of mutually parallel and also spaced apart transverse slats 2.
  • the fluorescent lamp 3 is located above these transverse lamellae 2 and in the center thereof.
  • the longitudinal and transverse lamellae 1 and 2 are formed from thin metal sheets and have a refined, preferably mirrored surface.
  • the cross-sectional shape of the longitudinal lamella 1 can be seen directly from FIG. 2; the cross-sectional shape of the transverse lamella is shown in Fig. 4, from which it can be seen that this transverse lamella is formed from a sheet metal strip bent essentially in a U-shape.
  • this transverse lamella 2 has no smooth surface over height, rather its surface is divided by prismatic or wedge-shaped sections 4, these individual sections being able to form 4 parabolic surfaces.
  • These individual sections 4 show different heights h over the height H of the transverse lamella 2, these heights h of these sections 4 decreasing from the bottom to the top.
  • the edges 5 and 6 which delimit these sections 4 lie essentially parallel to the Plane of the grid, in FIG. 1 thus parallel to the plane of the drawing.
  • the end configuration of the transverse lamella can be seen in FIG. 3.
  • An incision 11 is provided on the front side and on the lower edge, from which a groove 7 extends upwards to the upper edge 12, which corresponds to the curvature of the longitudinal lamella 1 with regard to its longitudinal profile.
  • a shoulder 13 forms a shoulder-shaped stop.
  • the groove 7 now has no continuous, flat groove base, but a plurality of openings 8 over its length. These openings 8 each lie in the area of the joint of adjacent sections 4.
  • the openings 8 are used to divide the groove base into webs 9, which clearly shows the longitudinal section according to FIG. 6 shows through the groove 7 on a greatly enlarged scale compared to the other figures.
  • These webs 9 are spaced apart from one another by the openings 8. From FIG. 6 it can be seen that these webs 9 run essentially parallel to the surfaces of the sections 4 which are laterally adjacent to them. If the valley-side edges 6 of the successive sections 4 are connected to one another, these imaginary connecting lines form a plane E 1, which is at right angles in FIG. 6 on the drawing plane.
  • the webs 9 and the openings 8 are now dimensioned and designed so that the outermost edge 10 of the openings 8 delimiting sections of the webs 9, which are adjacent to the outer sides of the transverse lamellae, are arranged in or behind this plane E 1, seen from the outside of the slat 2 (direction of view arrow A). If the outermost edges 10 of the webs 9 are mentioned here, the object of the invention is those edges which delimit the opening 8 and which have the greatest distance from an imaginary central plane M of the transverse lamella 2.
  • each web 9 has two outer edges, the spacing of which from the imaginary center plane M of the transverse lamella 2 is different.
  • the line labeled E1 also represents the boundary edge of the indentation or cutout, which is provided in the longitudinal lamella for receiving the front end of the transverse lamella 2. 6 makes it clear that the gap formation mentioned at the outset is successfully avoided here, in spite of the prismatic or wedge-shaped surface of the lamella 2.
  • the longitudinal slats 1 have a smooth surface. It is also within the scope of the invention to design the longitudinal lamella 1 or its surfaces in the manner as explained above in connection with the transverse lamellae.

Landscapes

  • 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)

Description

Die Erfindung bezieht sich auf einen Raster für Leuchtstofflampenleuchten mit Längslamellen und rechtwinkelig dazu angeordneten Querlamellen nach dem Oberbegriff des Anspruches 1.The invention relates to a grid for fluorescent lamp lights with longitudinal slats and transverse slats arranged at right angles thereto according to the preamble of claim 1.

Raster dieser Art sind aus der AT-PS 379 228 bekannt und auch das DE-GM 85 08 740 zeigt eine ähnliche Konstruktion. Die Lamellen dieser Raster besitzen über ihre Höhe glatte reflektierende Oberflächen und die am stirnseitigen Ende der Querlamelle vorgesehene eingeprägte Nut nimmt formschlüssig den Rand des Ausschnittes der Längslamelle auf, wodurch einerseits der Raster als ganzes stabiler wird, andererseits an diesen "Nahtstellen" verhindert wird, daß sich ein Spalt bildet, durch welchen das von der Lampe abgestrahlte Licht fallen kann. Die Längs- und Querlamellen bei solchen Rastern sind aus dünnen Aluminiumblechen gefertigt und der Raster in seiner Gesamtheit ist ein sehr labiles Bauelement, in welchem sowohl durch mechanische Beanspruchung wie auch durch Wärmedehnungen innere Spannungen entstehen, die zu, wenn auch nur kleinen Verformungen führen, so daß Spaltbildungen an den erwähnten "Nahtstellen" nicht auszuschließen sind, wenn nicht entsprechende Gegenmaßnahmen hiefür getroffen werden. Durch solche Spalte kann das von der Lampe abgestrahlte Licht nach außen fallen. Dies kann zu Effekten führen, die vom Beschauer als störend empfunden werden. Bei den oben erwähnten bekannten Konstruktionen ist dagegen erfolgreich Vorsorge getroffen worden, doch handelt es sich bei den Lamellen, die für diese Raster verwendet werden um solche, die über ihre gesamte Höhe eine glatte reflektierende Oberfläche besitzen.Grids of this type are known from AT-PS 379 228 and also DE-GM 85 08 740 shows a similar construction. The lamellas of this grid have smooth reflecting surfaces over their height and the embossed groove provided at the front end of the transverse lamella positively takes on the edge of the cutout of the longitudinal lamella, on the one hand making the grid as a whole more stable and on the other hand preventing these "seams" from being prevented a gap is formed through which the light emitted by the lamp can fall. The longitudinal and transverse lamellas of such grids are made of thin aluminum sheets and the grid as a whole is a very unstable component, in which internal stresses result from mechanical stress as well as thermal expansion, which lead to, even if only small, deformations that the formation of gaps at the "seams" mentioned cannot be ruled out unless appropriate countermeasures are taken. Through such gaps, the light emitted by the lamp can fall outside. This can lead to effects that the viewer finds annoying. On the other hand, precautions have been successfully taken with the known constructions mentioned above, but the slats used for these grids are those which have a smooth reflecting surface over their entire height.

Um die von solchen Rastern bewirkte Lichtverteilung zu steuern und günstig zu beeinflussen und um trotz der damit verbundenen notwendigen Oberflächengestaltung der Lamellen die erwähnte Spaltbildung zu verhindern, schlägt nun die Erfindung vor, daß bei einem Raster der eingangs erwähnten Art jene Maßnahmen getroffen werden, die Gegenstand des kennzeichnenden Teiles des Patentanspruches 1 sind. Trotz der so gestalteten Oberflächen der Lamellen kann der Rand des Einschnittes der Längslamelle in einer Weise aufgenommen werden, daß eine Spaltbildung vermieden wird und so kein Licht unkontrolliert nach außen fällt.In order to control and favorably influence the light distribution caused by such grids and to prevent the aforementioned gap formation despite the associated necessary surface design of the lamellae, the invention now proposes that those measures be taken with a grid of the type mentioned at the beginning of the characterizing part of claim 1. Despite the surfaces of the slats designed in this way the edge of the incision of the longitudinal lamella can be accommodated in such a way that a gap is avoided and so no light falls outwards in an uncontrolled manner.

Die Zeichnung veranschaulicht die Erfindung anhand eines Ausführungsbeispieles. Es zeigen: Fig. 1 einen Raster von unten gesehen; Fig. 2 den Raster nach Fig. 1, gesehen von schräg unten; Fig. 3 das stirnseitige Ende einer Querlamelle in Ansicht; Fig. 4 einen Querschnitt nach der Linie IV - IV in Fig. 3; Fig. 5 das stirnseitige Ende einer Querlamelle nach Fig. 3, jedoch in einem gegenüber dieser Figur vergrößerten Maßstab und in Schrägsicht; Fig. 6 einen Längsschnitt durch die Nut am stirnseitigen Ende der Querlamelle und in einem gegenüber Fig. 3 erheblich vergrößerten Maßstab.The drawing illustrates the invention using an exemplary embodiment. 1 shows a grid seen from below; Fig. 2 shows the grid of Figure 1, seen obliquely from below. Figure 3 shows the front end of a transverse lamella in view. 4 shows a cross section along the line IV - IV in Fig. 3. 5 shows the end of a transverse lamella according to FIG. 3, but on an enlarged scale compared to this figure and in an oblique view; Fig. 6 shows a longitudinal section through the groove at the front end of the transverse lamella and on a significantly enlarged scale compared to Fig. 3.

Die Fig. 1 und 2 veranschaulichen einen einfachen Raster für eine einflammige Leuchtstofflampenleuchte, wobei Fig. 1 eine Teiluntersicht darstellt. Dieser Raster besteht aus zwei zueinander parallelen und voneinander distanzierten Längslamellen 1. Diese beiden Längslamellen 1 sind nun durch mehrere zueinander parallele und voneinander ebenfalls distanzierte Querlamellen 2 miteinander verbunden. Oberhalb dieser Querlamellen 2 und mittig dazu liegt die Leuchtstofflampe 3. Längs- und Querlamellen 1 und 2 sind aus dünnen Blechen geformt und mit einer veredelten, vorzugsweise verspiegelten Oberfläche ausgestattet. Die Querschnittsform der Längslamelle 1 ist aus Fig. 2 unmittelbar erkennbar; die Querschnittsform der Querlamelle ist in Fig. 4 dargestellt, woraus ersichtlich ist, daß diese Querlamelle aus einem im wesentlichen U-förmig gebogenen Blechstreifen gebildet ist.1 and 2 illustrate a simple grid for a single-lamp fluorescent lamp, with FIG. 1 showing a partial bottom view. This grid consists of two mutually parallel and spaced apart longitudinal slats 1. These two longitudinal slats 1 are now connected to one another by a plurality of mutually parallel and also spaced apart transverse slats 2. The fluorescent lamp 3 is located above these transverse lamellae 2 and in the center thereof. The longitudinal and transverse lamellae 1 and 2 are formed from thin metal sheets and have a refined, preferably mirrored surface. The cross-sectional shape of the longitudinal lamella 1 can be seen directly from FIG. 2; the cross-sectional shape of the transverse lamella is shown in Fig. 4, from which it can be seen that this transverse lamella is formed from a sheet metal strip bent essentially in a U-shape.

Insbesondere aus der Querschnittsdarstellung nach der letzterwähnten Fig. 4 ist ersichtlich, daß diese Querlamelle 2 über Höhe keine glatte Oberfläche besitzt, vielmehr ist ihre Oberfläche durch prismatische oder keilförmig abgestufte Abschnitte 4 unterteilt, wobei diese einzelnen Abschnitte 4 Parabolflächen bilden können. Über die Höhe H der Querlamelle 2 zeigen diese einzelnen Abschnitte 4 unterschiedliche Höhen h, wobei diese Höhen h dieser Abschnitte 4 von unten nach oben hin abnehmen. Die Kanten 5 und 6, die diese Abschnitte 4 begrenzen, liegen im wesentlichen parallel zur Ebene des Rasters, in Fig. 1 also parallel zur Zeichenebene. Die stirnseitige Ausbildung der Querlamelle ist aus Fig. 3 erkennbar. Stirnseitig und am unteren Rand ist ein Einschnitt 11 vorgesehen, von dem aus sich nach oben zum oberen Rand 12 eine Nut 7 erstreckt, die hinsichtlich ihres Längsverlaufes der Krümmung der Längslamelle 1 entspricht. An diesem stirnseitigen Ende im Bereich der oberen Kante 12 bildet ein Absatz 13 einen schulterförmigen Anschlag. Bei der Montage von Querlamelle und Längslamelle greift der untere Einschnitt 11 am unteren Rand der Querlamelle 2 formschlüssig in den Scheitelbereich des entsprechenden Ausschnittes der Längslamelle ein und die Schulter, die durch den Absatz 13 gebildet wird, liegt an der Längslamelle sozusagen als Anschlag an, wogegen die eingeprägte Nut 7 die Ränder des Ausschnittes nacht Art einer linearen Schnappverbindung aufnimmt. Diese Verbindung ist aber aus dem Stand der Technik bekannt (AT-PS 379 228).In particular, from the cross-sectional view according to the last-mentioned Fig. 4 it can be seen that this transverse lamella 2 has no smooth surface over height, rather its surface is divided by prismatic or wedge-shaped sections 4, these individual sections being able to form 4 parabolic surfaces. These individual sections 4 show different heights h over the height H of the transverse lamella 2, these heights h of these sections 4 decreasing from the bottom to the top. The edges 5 and 6 which delimit these sections 4 lie essentially parallel to the Plane of the grid, in FIG. 1 thus parallel to the plane of the drawing. The end configuration of the transverse lamella can be seen in FIG. 3. An incision 11 is provided on the front side and on the lower edge, from which a groove 7 extends upwards to the upper edge 12, which corresponds to the curvature of the longitudinal lamella 1 with regard to its longitudinal profile. At this front end in the area of the upper edge 12, a shoulder 13 forms a shoulder-shaped stop. When installing the transverse lamella and the longitudinal lamella, the lower incision 11 at the lower edge of the transverse lamella 2 engages positively in the apex area of the corresponding cutout of the longitudinal lamella and the shoulder, which is formed by the shoulder 13, is, so to speak, a stop on the longitudinal lamella, whereas the embossed groove 7 takes up the edges of the cutout in the manner of a linear snap connection. However, this connection is known from the prior art (AT-PS 379 228).

Die Nut 7 besitzt nun keinen durchlaufenden ebenen Nutengrund, sondern über ihre Länge mehrere Durchbrechungen 8. Diese Durchbrechungen 8 liegen jeweils im Bereich der Stoßstelle benachbarter Abschnitte 4. Durch diese Durchbrechungen 8 wird der Nutengrund in Stege 9 unterteilt, was anschaulich der Längsschnitt nach Fig. 6 durch die Nut 7 in einem stark vergrößerten Maßstab gegenüber den anderen Figuren zeigt.The groove 7 now has no continuous, flat groove base, but a plurality of openings 8 over its length. These openings 8 each lie in the area of the joint of adjacent sections 4. The openings 8 are used to divide the groove base into webs 9, which clearly shows the longitudinal section according to FIG. 6 shows through the groove 7 on a greatly enlarged scale compared to the other figures.

Diese Stege 9 sind durch die Durchbrechungen 8 voneinander distanziert. Aus Fig. 6 ist ersichtlich, daß diese Stege 9 im wesentlichen parallel zu den ihnen seitlich benachbart liegenden Flächen der Abschnitte 4 verlaufen. Werden die jeweils talseitig liegenden Kanten 6 der aufeinanderfolgenden Abschnitte 4 miteinander verbunden, so bilden diese gedachten Verbindungslinien eine Ebene E₁, die rechtwinklig in Fig. 6 auf der Zeichenebene steht. Die Stege 9 bzw. die Durchbrechungen 8 sind nun so bemessen und ausgelegt, daß die jeweils äußerste Kante 10 der die Durchbrechungen 8 begrenzenden Abschnitte der Stege 9, die den Außenseiten der Querlamellen benachbart liegen, in oder hinter dieser Ebene E₁ angeordnet sind, gesehen von der Außenseite der Lamelle 2 (Blickrichtung Pfeil A). Wenn hier von den äußersten Kanten 10 der Stege 9 die Rede ist, so handelt es sich beim Gegenstand der Erfindung um jene, die Durchbrechung 8 begrenzenden Kanten, die von einer gedachten Mittelebene M der Querlamelle 2 den jeweils größten Abstand haben.These webs 9 are spaced apart from one another by the openings 8. From FIG. 6 it can be seen that these webs 9 run essentially parallel to the surfaces of the sections 4 which are laterally adjacent to them. If the valley-side edges 6 of the successive sections 4 are connected to one another, these imaginary connecting lines form a plane E 1, which is at right angles in FIG. 6 on the drawing plane. The webs 9 and the openings 8 are now dimensioned and designed so that the outermost edge 10 of the openings 8 delimiting sections of the webs 9, which are adjacent to the outer sides of the transverse lamellae, are arranged in or behind this plane E 1, seen from the outside of the slat 2 (direction of view arrow A). If the outermost edges 10 of the webs 9 are mentioned here, the object of the invention is those edges which delimit the opening 8 and which have the greatest distance from an imaginary central plane M of the transverse lamella 2.

Darauf ist hier ausdrücklich hinzuweisen, da jeder Steg 9 an sich zwei äußere Kanten hat, deren Abstand jedoch von der gedachten Mitelebene M der Querlamelle 2 unterschiedlich groß ist.This is expressly to be pointed out here, since each web 9 has two outer edges, the spacing of which from the imaginary center plane M of the transverse lamella 2 is different.

In Fig. 6 stellt die mit E₁ bezeichnete Linie auch die Begrenzungskante des Ein- oder Ausschnittes dar, der in der Längslamelle zur Aufnahme des stirnseitigen Endes der Querlamelle 2 vorgesehen ist. Fig. 6 macht dadurch deutlich, daß die eingangs erwähnte Spaltbildung hier erfolgreich vermieden wird, trotz der prismatischen bzw. keilförmig gestaffelten Oberfläche der Lamelle 2.In Fig. 6, the line labeled E₁ also represents the boundary edge of the indentation or cutout, which is provided in the longitudinal lamella for receiving the front end of the transverse lamella 2. 6 makes it clear that the gap formation mentioned at the outset is successfully avoided here, in spite of the prismatic or wedge-shaped surface of the lamella 2.

Aus Fig. 6 ist auch ersichtlich, daß die jeweilige Länge der einzelnen Stege 9 gemessen in der Längsrichtung der Nut 7 proportional verkürzt ist gegenüber der jeweiligen Höhe h der ihnen zugeordneten Abschnitte 4, wogegen die Länge der Durchbrechungen 8 über die gesamte Höhe der Querlamelle 2 im wesentlichen gleich ist.From Fig. 6 it can also be seen that the respective length of the individual webs 9, measured in the longitudinal direction of the groove 7, is shortened proportionally compared to the respective height h of the sections 4 assigned to them, whereas the length of the openings 8 extends over the entire height of the transverse lamella 2 is essentially the same.

Im gezeigten Ausführungsbeispiel besitzen die Längslamellen 1 eine glatte Oberfläche. Es liegt im Rahmen der Erfindung auch die Längslamelle 1 bzw. deren Oberflächen in der Weise zu gestalten, wie dies im Zusammenhang mit den Querlamellen vorstehend erläutert worden ist.In the exemplary embodiment shown, the longitudinal slats 1 have a smooth surface. It is also within the scope of the invention to design the longitudinal lamella 1 or its surfaces in the manner as explained above in connection with the transverse lamellae.

Claims (4)

  1. A screen for fluorescent light fittings with longitudinal laminae (1) and transverse laminae (2) disposed at right angles thereto, in which at least the transverse laminae (2) are formed by a V- or U-shaped sheet-metal strip, wherein a cutaway portion is provided in the longitudinal lamina (1) for joining the longitudinal and transverse laminae (1, 2) in a positive-locking manner, and the transverse lamina (2) projects into and through this cut-away portion, and the transverse lamina (2) has an indentation (11) on its front end and on its lower margin, the width of which corresponds to the wall thickness of the longitudinal lamina (1), and a step-shaped ledge (13) is provided on its upper margin (12), wherein there is provided adjacent to the indentation (11) a groove (7) which corresponds to the transverse path of the longitudinal lamina (1), is impressed into the transverse lamina (2) and essentially extends over the height (H) thereof, and which accommodates the margin of the cutaway portion of the longitudinal lamina (1) and adjoins the same, characterised in that at least the transverse lamina (2) has over its height (H) sections (4) which are prism-shaped or stepped in a wedge-shape and which may be of different heights (h), and the edges (5, 6) of these sections (4) lie essentially parallel to the plane of the screen, and in that the base of the groove (7) or the groove bottom has perforations (8), wherein the perforations (8) are situated in the region of the contact points of respectively adjacent sections (4), and the bars (9) which form the base of the groove (7) or the groove bottom and which are spaced apart from one another extend essentially parallel to the surfaces of the sections (4) which lie laterally adjacent to them, and the outermost edges (10) defining the perforations (8) between the bars (9) and lying adjacent to the exterior sides of the transverse lamina (2) lie in or - relative to the external side of the lamina - behind an imaginary plane (E₁) which contains the edges (6), on the valley side, of the prism- or wedge-shaped sections (4).
  2. A screen according to claim 1, characterised in that the lengths, measured in the longitudinal direction of the groove (7), of the bars (9) forming the groove bottom are shortened in proportion to the heights (h) of the sections (4) adjoining them.
  3. A screen according to claim 1, characterised in that the lengths, measured in the longitudinal direction of the groove (7), of the perforations (8) are of equal size.
  4. A screen according to one of claims 1 to 3, characterised in that the surfaces both of the transverse and also of the longitudinal laminae (1, 2) are of the same design.
EP88104820A 1987-04-13 1988-03-25 Screen for a fluorescent-light fitting Expired - Lifetime EP0286890B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0091687A AT386471B (en) 1987-04-13 1987-04-13 GRID FOR FLUORESCENT LAMP LIGHTS
AT916/87 1987-04-13

Publications (3)

Publication Number Publication Date
EP0286890A2 EP0286890A2 (en) 1988-10-19
EP0286890A3 EP0286890A3 (en) 1989-11-29
EP0286890B1 true EP0286890B1 (en) 1992-09-02

Family

ID=3502778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104820A Expired - Lifetime EP0286890B1 (en) 1987-04-13 1988-03-25 Screen for a fluorescent-light fitting

Country Status (3)

Country Link
EP (1) EP0286890B1 (en)
AT (1) AT386471B (en)
DE (1) DE3874182D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000066948A1 (en) 1999-04-28 2000-11-09 Koninklijke Philips Electronics N.V. Luminaire with lamellae having a gradual change in their profiles

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2743406B1 (en) * 1996-01-10 1998-04-03 Vial Henri Noel IMPROVEMENT WITH SCREENING GRIDS FOR FLUORESCENT LIGHTING
NL1011025C2 (en) * 1999-01-14 2000-07-17 Juliette Simone Catharina Van Fluorescent lighting assembly has transverse laminae which have narrow section and provide greater light output than from conventional assembly
DE10315268A1 (en) 2003-04-03 2004-10-14 Zumtobel Staff Gmbh Light influencing element

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2460115B2 (en) * 1974-12-19 1977-12-22 Trilux - Lenze Gmbh + Co Kg, 5760 Arnsberg GRID COVER WITH BASICALLY PLANE CROSSED SLATS FOR LONG ELEVATED FLUORESCENT LAMPS
FR2298057A1 (en) * 1975-01-17 1976-08-13 Cegedur Fire retarding antidazzle light screen - has profiled sections of fresnel lens shape intersected by folded blades
DE2648961A1 (en) * 1976-10-28 1977-11-03 Trilux Lenze Gmbh & Co Kg Aluminium anti dazzle lampshade - has mesh of strips with both sides stepped and forming concave reflective surface
FR2485691A1 (en) * 1980-06-24 1981-12-31 Cetek Const Electrotechni Cent Reflective grille for fluorescent tube light - uses array of V=shaped parabolic segment reflectors of differing profiles and differing vertical orientation to maximise illumination
AT379228B (en) * 1984-03-06 1985-12-10 Zumtobel Ag GRID FOR FLUORESCENT LAMP LIGHTS
DE8508740U1 (en) * 1985-03-23 1985-05-15 Zumtobel Ag, Dornbirn Grid for fluorescent lamp luminaires

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000066948A1 (en) 1999-04-28 2000-11-09 Koninklijke Philips Electronics N.V. Luminaire with lamellae having a gradual change in their profiles
US6305824B1 (en) 1999-04-28 2001-10-23 U.S. Philips Corporation Luminaire with lamellae having a gradual change in their profiles

Also Published As

Publication number Publication date
EP0286890A2 (en) 1988-10-19
EP0286890A3 (en) 1989-11-29
DE3874182D1 (en) 1992-10-08
AT386471B (en) 1988-08-25
ATA91687A (en) 1988-01-15

Similar Documents

Publication Publication Date Title
DE2930470C2 (en)
DE3434999C2 (en) Support grid for a suspended ceiling
AT399369B (en) GLARE PROTECTION DEVICE
EP0309832A1 (en) Lighting fixture
DE3005762C2 (en) Luminaire grid with curved external reflectors
WO2010037777A1 (en) Insertion connector
EP0286890B1 (en) Screen for a fluorescent-light fitting
DE4322631A1 (en) Connector for C-profiles
DE3418687A1 (en) Metal wall
DE3919600C2 (en) Luminaire grid for a luminaire with incandescent or discharge lamps
EP0085355B2 (en) Device for the connection of air-channel elements provided with flange sections at their edges which form openings for corner angles
EP0493371B1 (en) Container, in particular silo
DE3034892C2 (en) Luminaire grid with external reflectors
DE3112210C2 (en) Mirror light
DE3014365A1 (en) Light fitting for elongated lamp - has reflecting strap, carrying on its upper side tooth-shaped reflectors, parallel to lamp axis
DE29716378U1 (en) Connectors for hollow profiles
DE2758261B2 (en) Luminaire grid
AT500187A1 (en) GRID LAMEL AND GRID FOR AN IMPROVED LIGHT SHADE AND ASSOCIATED LIGHT
DE4243659A1 (en) Metal grid for a lamp
DE2460115B2 (en) GRID COVER WITH BASICALLY PLANE CROSSED SLATS FOR LONG ELEVATED FLUORESCENT LAMPS
DE8508740U1 (en) Grid for fluorescent lamp luminaires
AT388644B (en) Plant support
DE3707477A1 (en) Luminaire louvre (spill shield)
DE8713073U1 (en) Cover grille for panel radiators
DE10135389A1 (en) C-section

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): BE DE FR GB IT LU NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): BE DE FR GB IT LU NL

17P Request for examination filed

Effective date: 19900118

17Q First examination report despatched

Effective date: 19911127

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE FR GB IT LU NL

REF Corresponds to:

Ref document number: 3874182

Country of ref document: DE

Date of ref document: 19921008

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: INTERPATENT ST.TECN. BREV.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19921214

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19930303

Year of fee payment: 6

EPTA Lu: last paid annual fee
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940325

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19950315

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19950321

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19950329

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19950331

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19950518

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19960325

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19960331

BERE Be: lapsed

Owner name: ZUMTOBEL A.G.

Effective date: 19960331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19961001

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19960325

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19961129

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19961001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19961203

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050325