EP1073862B2 - Light guiding device for an oblong light source - Google Patents

Light guiding device for an oblong light source Download PDF

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Publication number
EP1073862B2
EP1073862B2 EP99917682A EP99917682A EP1073862B2 EP 1073862 B2 EP1073862 B2 EP 1073862B2 EP 99917682 A EP99917682 A EP 99917682A EP 99917682 A EP99917682 A EP 99917682A EP 1073862 B2 EP1073862 B2 EP 1073862B2
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EP
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Prior art keywords
light source
grooves
light
axis
axial
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EP99917682A
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German (de)
French (fr)
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EP1073862B1 (en
EP1073862A1 (en
Inventor
Johannes Huter
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ZUMTOBEL LIGHTING GmbH
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Zumtobel Lighting GmbH Austria
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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
    • F21V5/00—Refractors for light sources
    • F21V5/02—Refractors for light sources of prismatic shape
    • 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
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors

Definitions

  • the present invention relates to a device for guiding light for an elongate light source, in particular fluorescent tube, with a substantially tubular or tubular sector-shaped body of transparent material for substantially coaxial recording of the light source, or the like on its inside with axially parallel adjacent grooves, notches. is provided, which have flanks, which are seen in an axial normal section at an angle of 40 ° to 46 °, preferably 43 °, inclined with respect to the radial direction.
  • a device of the aforementioned type is known from EP 0372272.
  • the grooves are used for scattering or fanning of the light distribution in axialnormaler direction to reduce the luminous flux density immediately below the light source.
  • the question of a light dimming relative to the axial direction of the light source is not addressed in this document.
  • a light guide is often desired in practice in order to maintain a predetermined radiation angle, outside of which there is a substantial suppression of the light emitted by the light source.
  • refracting or reflecting devices can be used; a known type of reflective devices are mirror grids of longitudinal and transverse reflector fins. Also combinations of refracting and reflecting devices are possible.
  • the invention has for its object to provide a refracting light guide device, which is a cost-effective alternative to mirror grid lights.
  • this structure causes a deflection of light rays near the axial direction in one of the radial directions.
  • the light emission of a fluorescent tube enveloped (at least partially) by such a device is hidden in an angular cone about the axial, i. the beam angle normal to the fluorescent tube axis (e.g., down) is restricted.
  • the axial normal slats which are customary in mirror grid lights, since the light guiding device according to the invention takes over the light suppression in the longitudinal direction.
  • the grooves are distributed evenly over the inner circumference of the body, and more preferably at least 20 grooves are provided. As a result, the light distribution over the emission area is made uniform.
  • the radius of the flanks is 0.5 to 2.0 times the distance between half the depth of the grooves and the axis of the body.
  • the distance between half the depth of the grooves and axis of the body is 1.4 to 1.7 times the radius of the male light source, which allows a particularly compact design.
  • the refractive index of the transparent material is at least 1.45, which provides a greater shading angle, i. allows a lower beam angle.
  • Another aspect of the invention is to provide a lamp with an elongated light source, in particular fluorescent tube, which is overlapped by a roof-like reflector and is equipped with a light guiding device according to the invention with a tubular body which surrounds the light source. If a light guide device with a tubular sector-shaped body is used, this surrounds the light source on its side facing away from the reflector.
  • the light source 1 and the body 3 roof-spanning or encompassing a trough, inverted-U or teilparabelförmiger reflector 4 of conventional design is arranged.
  • the length of the lamp shown in section in Fig. 1 in the direction of the axis 2 can be chosen arbitrarily.
  • any known form of "elongate light source” is possible, e.g. Halogen rods, chains of individual light sources such as incandescent lamps, etc.
  • the axis 2 of the light source 1 need not necessarily be straight, but may also be slightly curved or polygonzugförmig, in which cases the body 3 is adapted to the course of the light source 1 accordingly.
  • the body 3 is on its inside with the axis 2 parallel to each other, adjacent grooves 5, notches or the like. Mistake. In the example shown, 12 grooves 5 are evenly distributed over the inner circumference of the body 3.
  • the grooves 5 have concave flanks 6, 7, viewed in an axially normal section.
  • the radius R 1 of the flanks 6, 7 is approximately 0.5 to 2.0 times the distance R 2 between half the depth of Ridges 5 and the common axis 2 of light source 1 and body 3.
  • the mean angle ( ⁇ 1 + ⁇ 2 ) / 2 of the flanks 6, 7 to the radial 8 is in the range of 40 ° - 46 °, preferably at about 43 °.
  • the distance R 2 between about half the depth of the grooves 5 and the common axis 2 of the light source 1 and body 3 is about 1.4 to 1.7 times the radius R L of the light source 1.
  • the outer radius R 3 of the body 3 is chosen as low as possible, ie so that just a sufficient strength for the body 3 is given.
  • the bottoms 9 of the grooves 5 therefore extend to close to the outer periphery of the body. 3
  • the number of grooves 5 can be chosen arbitrarily large and is limited in practice by manufacturing limitations.
  • the operation of the device is as follows.
  • the light rays emanating from the light source 2 are deflected by the prism-like structure of the body 3 formed by the grooves 5, not only in the axially normal plane (as shown in FIG. 1), but also in each axially parallel plane from which an exemplary one shown in FIG. 2 is shown.
  • the body 3 shines in each direction perpendicular to the axis wider than the light source.
  • FIGS. 4 and 5 show a spatial representation of the combination of the sketched in FIGS. 1 and 2 refraction effects. All light rays emanating from a point 10 on the light source 2 at a cone sheath angle 11 with respect to the axis 2 (FIG. 4) are emitted when the body 3 (FIG. 5) is interposed in the form of a "compressed" cone sheath 12 around the axis 2 a Abschattungskegel 13 is formed.
  • the shading cone 13 produces a restriction of the emission angle of the light shown in Fig. 1 normal to the plane of the drawing in Fig. 1, as he otherwise could only be achieved by axially normal transverse fins within the reflector 4, down.
  • the shading in the axial direction has an advantageous effect, since the deflected from the shading light rays increase the radiation intensity of the light sources / body assembly on the reflector 4, so that it is better utilized.
  • a particular advantage arises in conjunction with reflectors, which do not change the angle of rays to the axis, the apex angle of the Abschattungskegels the entire lamp is therefore not smaller than that of the light guide.
  • axial normal plane reflectors which serve as a two-sided conclusion of the reflector 4, or axially parallel trough-shaped reflectors, in which each point of the reflector has an axially parallel tangent plane at which the angle of each beam is only mirrored to the axis, but does not change in magnitude. With such reflectors, the longitudinal suppression of the light guide is not reduced.
  • the body 3 does not have to enclose the light source 2 on all sides, for example, a tubular sector-shaped body which supplies the light source 2 e.g. on its side facing away from the reflector 4 partial ring surrounds, for example, to 1/4, half or 3/4.
  • both the reflector and the body may have coincident vacancies, axially parallel slots, or open sectors, etc., which allow unobstructed passage of certain light rays from the light source.
  • This variant is useful, for example, for suspended ceiling lights, in which the body and the reflector at the top have a longitudinal slot through which the ceiling is directly illuminated from below, thereby creating a partial indirect lighting of the room.
  • the body 3 can be extruded from a transparent plastic.
  • the body 3 can be made of a correspondingly profiled foil, which is bent around the light source 2 partly or completely around it. It is also possible to use a plurality of coaxial bodies 3 enclosing or surrounding each other (adjacent or with play), so that a cascading their effects, ie an enlargement of the shading angle 13 results.
  • the light source 1 may also have other than circular cross-section and need not be arranged coaxially with the body 3.
  • tubular body 3 is meant not only a cylindrical tubular body, but a generally tubular body, e.g. with elliptical profile, rounded-cornered profile etc.
  • the body 3 may be opposed to the light source 1, as shown, i. the apexes 14 formed between the flanks 6, 7 of adjacent grooves 5 rest on the outer surface of the light source 1.
  • the body 3 may be made integral with the outer wall of the light source 1, for example, as a shell of a fluorescent tube.

Abstract

The light guide has a transparent body (3) provided by a tube or a tubular sector, positioned coaxially around the elongate light source (1). This provides grooves (5) extending parallel to its axis, which are equally spaced around the inside surface of the light guide. An Independent claim is included for a lamp with an elongate light source.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur Lichtführung für eine langgestreckte Lichtquelle, insbesondere Leuchtstoffröhre, mit einem im wesentlichen rohr- oder rohrsektorförmigen Körper aus transparentem Material zur im wesentlichen koaxialen Aufnahme der Lichtquelle, der an seiner Innenseite mit axialparallelen aneinandergrenzenden Riefen, Kerben od.dgl. versehen ist, welche Flanken haben, die in einem axialnormalen Schnitt gesehen in einem Winkel von 40° bis 46°, bevorzugt 43°, gegenüber der Radialrichtung geneigt sind.The present invention relates to a device for guiding light for an elongate light source, in particular fluorescent tube, with a substantially tubular or tubular sector-shaped body of transparent material for substantially coaxial recording of the light source, or the like on its inside with axially parallel adjacent grooves, notches. is provided, which have flanks, which are seen in an axial normal section at an angle of 40 ° to 46 °, preferably 43 °, inclined with respect to the radial direction.

Eine Vorrichtung der einleitend genannten Art ist aus der EP 0372272 bekannt. Bei der bekannten Vorrichtung dienen die Riefen zur Streuung bzw. Auffächerung der Lichtverteilung in axialnormaler Richtung, um die Lichtstromdichte unmittelbar unter der Lichtquelle herabzusetzen. Die Frage einer Lichtabblendung relativ zur Axialrichtung der Lichtquelle wird in dieser Schrift nicht angesprochen.A device of the aforementioned type is known from EP 0372272. In the known device, the grooves are used for scattering or fanning of the light distribution in axialnormaler direction to reduce the luminous flux density immediately below the light source. The question of a light dimming relative to the axial direction of the light source is not addressed in this document.

Bei langgestreckten Lichtquellen, wie Leuchtstoffröhren, ist in der Praxis häufig eine Lichtführung erwünscht, um einen vorgegebenen Strahlungswinkel einzuhalten, außerhalb dessen eine weitgehende Ausblendung des von der Lichtquelle ausgesandten Lichtes erfolgt. Dazu können refraktierende oder reflektierende Vorrichtungen eingesetzt werden; eine bekannte Art von reflektierenden Vorrichtungen sind Spiegelraster aus Längs- und Querreflektorlamellen. Auch Kombinationen aus refraktierenden und reflektierenden Einrichtungen sind möglich.In the case of elongated light sources, such as fluorescent tubes, a light guide is often desired in practice in order to maintain a predetermined radiation angle, outside of which there is a substantial suppression of the light emitted by the light source. For this purpose, refracting or reflecting devices can be used; a known type of reflective devices are mirror grids of longitudinal and transverse reflector fins. Also combinations of refracting and reflecting devices are possible.

Die Erfindung setzt sich zum Ziel, eine refraktierende Lichtführungsvorrichtung zu schaffen, welche eine kostengünstige Alternative zu Spiegelrasterleuchten darstellt.The invention has for its object to provide a refracting light guide device, which is a cost-effective alternative to mirror grid lights.

Dieses Ziel wird mit einer Vorrichtung der einleitend genannten Art erreicht, die sich gemäß der Erfindung dadurch auszeichnet, daß die Riefen in einem axialnormalen Schnitt gesehen konkave Flanken aufweisen. Dadurch können die Streuungseigenschaften der Riefenstrukturen minimiert werden, was die Abschattungsgrenze verschärft, und der gesamte Lichttransmissionsgrad (= Wirkungsgrad) wird maximiert.This object is achieved with a device of the aforementioned type, which is characterized according to the invention in that the grooves have seen in an axially normal section concave flanks. Thereby, the scattering properties of the scribe structures can be minimized, which aggravates the shading limit, and the overall light transmittance (= efficiency) is maximized.

Dadurch ergibt sich eine neue, verbesserte Art von Prismenstruktur mit über die Längsrichtung des Körpers konstantem Profil, deren Wirkungsweise später noch ausführlicher beschrieben wird. Im Effekt bewirkt diese Struktur eine Umlenkung von axialrichtungsnahen Lichtstrahlen in eine der Radialen nähere Richtung. Die Lichtabstrahlung einer von einer solchen Vorrichtung (zumindest teilweise) umhüllten Leuchtstoffröhre wird in einem Winkelkegel um die Axiale ausgeblendet, d.h. der Abstrahlwinkel normal zur Leuchtstoffröhrenachse (z.B. nach unten) wird eingeschränkt. Im Ergebnis kann auf die bei Spiegelrasterleuchten üblichen axialnormalen Lamellen verzichtet werden, da die erfindungsgemäße Lichtführungsvorrichtung die Lichtausblendung in Längsrichtung übernimmt.This results in a new, improved type of prism structure with a constant profile over the longitudinal direction of the body, the mode of action of which will be described in more detail later. In effect, this structure causes a deflection of light rays near the axial direction in one of the radial directions. The light emission of a fluorescent tube enveloped (at least partially) by such a device is hidden in an angular cone about the axial, i. the beam angle normal to the fluorescent tube axis (e.g., down) is restricted. As a result, it is possible to dispense with the axial normal slats which are customary in mirror grid lights, since the light guiding device according to the invention takes over the light suppression in the longitudinal direction.

Bevorzugt werden die Riefen gleichmäßig über den Innenumfang des Körpers verteilt, und besonders bevorzugt sind zumindest 20 Riefen vorgesehen. Dadurch wird die Lichtverteilung über den Abstrahlbereich vergleichmäßigt.Preferably, the grooves are distributed evenly over the inner circumference of the body, and more preferably at least 20 grooves are provided. As a result, the light distribution over the emission area is made uniform.

Bevorzugt beträgt der Radius der Flanken das 0,5- bis 2,0-fache des Abstandes zwischen halber Tiefe der Riefen und Achse des Körpers.Preferably, the radius of the flanks is 0.5 to 2.0 times the distance between half the depth of the grooves and the axis of the body.

Bevorzugt ist der Abstand zwischen halber Tiefe der Riefen und Achse des Körpers das 1,4- bis 1,7-fache des Radius der aufzunehmenden Lichtquelle, was eine besonders kompakte Bauform ermöglicht.Preferably, the distance between half the depth of the grooves and axis of the body is 1.4 to 1.7 times the radius of the male light source, which allows a particularly compact design.

In jedem Fall ist es besonders vorteilhaft, wenn der Brechungsindex des transparenten Materials zumindest 1,45 beträgt, was einen größeren Abschattungswinkel, d.h. einen geringeren Abstrahlwinkel ermöglicht.In any case, it is particularly advantageous if the refractive index of the transparent material is at least 1.45, which provides a greater shading angle, i. allows a lower beam angle.

Ein weiterer Aspekt der Erfindung besteht in der Schaffung einer Leuchte mit einer langgestreckten Lichtquelle, insbesondere Leuchtstoffröhre, die von einem dachartigen Reflektor übergriffen ist und mit einer erfindungsgemäßen Lichtführungsvorrichtung mit rohrförmigem Körper ausgestattet ist, welcher die Lichtquelle umschließt. Wenn eine Lichtführungsvorrichtung mit rohrsektorförmigem Körper verwendet wird, umgibt dieser die Lichtquelle an ihrer dem Reflektor abgewandten Seite.Another aspect of the invention is to provide a lamp with an elongated light source, in particular fluorescent tube, which is overlapped by a roof-like reflector and is equipped with a light guiding device according to the invention with a tubular body which surrounds the light source. If a light guide device with a tubular sector-shaped body is used, this surrounds the light source on its side facing away from the reflector.

Die Erfindung wird nachstehend an Hand eines in den Zeichnungen dargestellten Ausführungsbeispieles näher erläutert. In den Zeichnungen zeigt

  • Fig. 1 eine erfindungsgemäße Leuchte in einem Schnitt normal zur Längsachse,
  • Fig. 2 ein Teilstück der Lichtquelle und der Lichtführungsvorrichtung der Leuchte von Fig. 1 in einer schematischen Seitenansicht,
  • Fig. 3 Dimensionierungsverhältnisse an einem beispielhaften Sektorstück der Lichtführungsvorrichtung in einem Schnitt ähnlich der Fig. 1, und die
  • Fig. 4 und 5 schematische Abstrahlverhältnisse von einem Punkt der Lichtquelle ohne (Fig. 4) bzw. mit (Fig. 5) Lichtführungsvorrichtung.
The invention will be explained in more detail below with reference to an embodiment shown in the drawings. In the drawings shows
  • 1 shows a lamp according to the invention in a section normal to the longitudinal axis,
  • 2 shows a section of the light source and the light-guiding device of the luminaire of FIG. 1 in a schematic side view, FIG.
  • 3 shows dimensioning conditions on an exemplary sector piece of the light guiding device in a section similar to FIG. 1, and FIGS
  • 4 and 5 show schematic emission ratios from one point of the light source without (FIG. 4) or with (FIG. 5) light guide device.

Die in den Fig. 1 und 2 dargestellte Leuchte enthält eine langgestreckte Lichtquelle 1 in Form einer Leuchtstoffröhre mit einer Längsachse 2, welche im Inneren eines im wesentlichen rohrförmigen Körpers 3 aus transparentem Material mit einem Brechungsindex von z.B. n = 1,5 koaxial mit Spiel angeordnet ist. Die Lichtquelle 1 und den Körper 3 dachartig überspannend bzw. umgreifend ist ein Trog-, umgekehrt-U- bzw. teilparabelförmiger Reflektor 4 üblicher Bauart angeordnet.1 and 2 includes an elongated light source 1 in the form of a fluorescent tube having a longitudinal axis 2 arranged inside a substantially tubular body 3 of transparent material having a refractive index of, for example, n = 1.5 coaxial with clearance is. The light source 1 and the body 3 roof-spanning or encompassing a trough, inverted-U or teilparabelförmiger reflector 4 of conventional design is arranged.

Die Länge der in Fig. 1 im Schnitt gezeigten Leuchte in Richtung der Achse 2 kann beliebig gewählt werden. Anstelle einer Leuchtstoffröhre ist jede bekannte Form einer "langgestreckten Lichtquelle" möglich, z.B. Halogenstäbe, Ketten von einzelnen Lichtquellen wie Glühlampen usw. Die Achse 2 der Lichtquelle 1 muß nicht notwendigerweise gerade sein, sondern kann auch leicht gekrümmt oder polygonzugförmig sein, in welchen Fällen der Körper 3 entsprechend an den Verlauf der Lichtquelle 1 angepaßt ist.The length of the lamp shown in section in Fig. 1 in the direction of the axis 2 can be chosen arbitrarily. Instead of a fluorescent tube, any known form of "elongate light source" is possible, e.g. Halogen rods, chains of individual light sources such as incandescent lamps, etc. The axis 2 of the light source 1 need not necessarily be straight, but may also be slightly curved or polygonzugförmig, in which cases the body 3 is adapted to the course of the light source 1 accordingly.

Der Körper 3 ist an seiner Innenseite mit zur Achse 2 parallel verlaufenden, aneinander angrenzenden Riefen 5, Kerben od.dgl. versehen. Im gezeigten Beispiel sind 12 Riefen 5 gleichmäßig über den Innenumfang des Körpers 3 verteilt.The body 3 is on its inside with the axis 2 parallel to each other, adjacent grooves 5, notches or the like. Mistake. In the example shown, 12 grooves 5 are evenly distributed over the inner circumference of the body 3.

Gemäß Fig. 3 besitzen die Riefen 5 in einem axialnormalen Schnitt gesehen konkave Flanken 6, 7. Der Radius R1 der Flanken 6, 7 beträgt etwa das 0,5- bis 2,0-fache des Abstandes R2 zwischen der halben Tiefe der Riefen 5 und der gemeinsamen Achse 2 von Lichtquelle 1 und Körper 3. Der mittlere Winkel (ϕ1+ϕ2)/2 der Flanken 6, 7 zur Radialen 8 liegt im Bereich von 40° - 46°, bevorzugt bei etwa 43°. Der Abstand R2 zwischen etwa der halben Tiefe der Riefen 5 und der gemeinsamen Achse 2 von Lichtquelle 1 und Körper 3 beträgt etwa das 1,4- bis 1,7-fache des Radius RL der Lichtquelle 1. Der Außenradius R3 des Körpers 3 wird so gering wie möglich gewählt, d.h. so, daß gerade noch eine ausreichende Festigkeit für den Körper 3 gegeben ist. Die Talsohlen 9 der Riefen 5 reichen daher bis nahe an den Außenumfang des Körpers 3.According to FIG. 3, the grooves 5 have concave flanks 6, 7, viewed in an axially normal section. The radius R 1 of the flanks 6, 7 is approximately 0.5 to 2.0 times the distance R 2 between half the depth of Ridges 5 and the common axis 2 of light source 1 and body 3. The mean angle (φ 1 + φ 2 ) / 2 of the flanks 6, 7 to the radial 8 is in the range of 40 ° - 46 °, preferably at about 43 °. The distance R 2 between about half the depth of the grooves 5 and the common axis 2 of the light source 1 and body 3 is about 1.4 to 1.7 times the radius R L of the light source 1. The outer radius R 3 of the body 3 is chosen as low as possible, ie so that just a sufficient strength for the body 3 is given. The bottoms 9 of the grooves 5 therefore extend to close to the outer periphery of the body. 3

Die Anzahl der Riefen 5 kann beliebig groß gewählt werden und ist in der Praxis durch Fertigungseinschränkungen begrenzt.The number of grooves 5 can be chosen arbitrarily large and is limited in practice by manufacturing limitations.

Die Wirkungsweise der Vorrichtung ist wie folgt.The operation of the device is as follows.

Die von der Lichtquelle 2 ausgehenden Lichtstrahlen werden durch die von den Riefen 5 gebildete prismenartige Struktur des Körpers 3 nicht nur in der axialnormalen Ebene (wie in Fig. 1 gezeigt) umgelenkt, sondern auch in jeder axialparallelen Ebene, von der eine beispielhafte in Fig. 2 gezeigt ist. Wie aus dieser Figur ersichtlich, werden zur Achse 2 unter einem Winkel δL geneigte Lichtstrahlen SL beim Durchgang durch den Körper 3 näher in Richtung der Radialen 8 abgelenkt, u.zw. unter einem Winkel δR > δL.The light rays emanating from the light source 2 are deflected by the prism-like structure of the body 3 formed by the grooves 5, not only in the axially normal plane (as shown in FIG. 1), but also in each axially parallel plane from which an exemplary one shown in FIG. 2 is shown. As seen from this figure, the axis 2 at an angle δ L inclined light beams S L during the passage through the body 3 deflected closer in the radial direction 8, u.zw. at an angle δ R > δ L.

Wie aus Fig. 1 ersichtlich, leuchtet der Körper 3 in jeder Richtung senkrecht zur Achse breiter als die Lichtquelle 1.As can be seen from FIG. 1, the body 3 shines in each direction perpendicular to the axis wider than the light source. 1

Die Fig. 4 und 5 zeigen eine räumliche Darstellung der Kombination der in den Fig. 1 und 2 skizzierten Brechungseffekte. Alle Lichtstrahlen, die von einem Punkt 10 auf der Lichtquelle 2 unter einem Kegelmantelwinkel 11 bezogen auf die Achse 2 ausgehen (Fig. 4), werden bei Zwischenschaltung des Körpers 3 (Fig. 5) in Form eines "gestauchten" Kegelmantels 12 ausgesandt, wobei um die Achse 2 ein Abschattungskegel 13 entsteht.4 and 5 show a spatial representation of the combination of the sketched in FIGS. 1 and 2 refraction effects. All light rays emanating from a point 10 on the light source 2 at a cone sheath angle 11 with respect to the axis 2 (FIG. 4) are emitted when the body 3 (FIG. 5) is interposed in the form of a "compressed" cone sheath 12 around the axis 2 a Abschattungskegel 13 is formed.

Der Abschattungskegel 13 erzeugt eine Beschränkung des Abstrahlwinkels der in Fig. 1 dargestellten Leuchte normal zur Zeichnungsebene in Fig. 1, wie er sonst nur durch axialnormale Querlamellen innerhalb des Reflektors 4 erreicht werden könnte, nach unten. Ein Vorzug dieser Lichtführung ist, daß ab einer Größe von ca. R2 = 1,4 x RL praktisch sämtliches Licht die Lichtführung verläßt, d.h. kaum mehr Abschattungsverluste auftreten, wie sie z.B. durch Rückspiegelung in die Lichtquelle von den Querlamellen einer Spiegelrasterleuchte verursacht werden, deren oberer Steg schwarz ist.The shading cone 13 produces a restriction of the emission angle of the light shown in Fig. 1 normal to the plane of the drawing in Fig. 1, as he otherwise could only be achieved by axially normal transverse fins within the reflector 4, down. An advantage of this light guide is that from a size of about R 2 = 1.4 x R L virtually all light leaves the light guide, ie hardly more Abschattungsverluste occur, as caused for example by back-reflection in the light source of the transverse lamellae of a mirror grid whose upper bridge is black.

Auch in Richtung nach oben, d.h. zum Reflektor 4 gerichtet, hat die Abschattung in axialer Richtung eine vorteilhafte Wirkung, da die aus dem Abschattungsbereich umgelenkten Lichtstrahlen die Strahlungsintensität der Lichtquellen/Körper-Anordnung auf den Reflektor 4 erhöhen, so daß dieser besser ausgenützt wird. Ein besonderer Vorzug ergibt sich in Verbindung mit Reflektoren, welche den Winkel von Strahlen zur Achse nicht verändern, der Scheitelwinkel des Abschattungskegels der gesamten Leuchte also nicht kleiner ist als jener der Lichtführung. Das sind z.B. axialnormale ebene Reflektoren, welche als beidseitiger Abschluß des Reflektors 4 dienen, oder auch axialparallele rinnenförmige Reflektoren, bei denen jeder Punkt des Reflektors eine axialparallele Tangentialebene besitzt, an welcher der Winkel jedes Strahles zur Achse nur gespiegelt wird, sich im Betrag aber nicht ändert. Mit derartigen Reflektoren wird die Längsausblendung der Lichtführung nicht verkleinert.Also in the upward direction, i. directed to the reflector 4, the shading in the axial direction has an advantageous effect, since the deflected from the shading light rays increase the radiation intensity of the light sources / body assembly on the reflector 4, so that it is better utilized. A particular advantage arises in conjunction with reflectors, which do not change the angle of rays to the axis, the apex angle of the Abschattungskegels the entire lamp is therefore not smaller than that of the light guide. These are e.g. axial normal plane reflectors, which serve as a two-sided conclusion of the reflector 4, or axially parallel trough-shaped reflectors, in which each point of the reflector has an axially parallel tangent plane at which the angle of each beam is only mirrored to the axis, but does not change in magnitude. With such reflectors, the longitudinal suppression of the light guide is not reduced.

In einer vereinfachten Ausführungsform muß der Körper 3 die Lichtquelle 2 nicht allseitig umschließen, es genügt beispielsweise ein rohrsektorförmiger Körper, welcher die Lichtquelle 2 z.B. an ihrer dem Reflektor 4 abgewandten Seite teilringförmig umgibt, beispielsweise zu 1/4, zur Hälfte oder zu 3/4. Alternativ können sowohl der Reflektor als auch der Körper zusammenfallende offene Stellen, axialparallele Schlitze oder offene Sektoren usw. haben, welche einen ungehinderten Durchgang bestimmter Lichtstrahlen der Lichtquelle ermöglichen. Diese Variante ist beispielsweise für abgehängte Deckenleuchten sinnvoll, bei denen der Körper und der Reflektor an der Oberseite einen Längsschlitz aufweisen, durch welchen die Decke von unten direkt angestrahlt wird, um dadurch eine teilweise indirekte Beleuchtung des Raumes zu schaffen.In a simplified embodiment, the body 3 does not have to enclose the light source 2 on all sides, for example, a tubular sector-shaped body which supplies the light source 2 e.g. on its side facing away from the reflector 4 partial ring surrounds, for example, to 1/4, half or 3/4. Alternatively, both the reflector and the body may have coincident vacancies, axially parallel slots, or open sectors, etc., which allow unobstructed passage of certain light rays from the light source. This variant is useful, for example, for suspended ceiling lights, in which the body and the reflector at the top have a longitudinal slot through which the ceiling is directly illuminated from below, thereby creating a partial indirect lighting of the room.

Der Körper 3 kann aus einem transparenten Kunststoff extrudiert werden. Alternativ kann der Körper 3 aus einer entsprechend profilierten Folie gefertigt werden, welche um die Lichtquelle 2 teilweise oder diese ganz umschließend herumgebogen wird. Es ist auch möglich, mehrere koaxiale Körper 3 einander umschließend oder umgebend (anliegend oder mit Spiel) zu verwenden, so daß sich eine Kaskadierung ihre Effekte, d.h. eine Vergrößerung des Abschattungswinkels 13 ergibt.The body 3 can be extruded from a transparent plastic. Alternatively, the body 3 can be made of a correspondingly profiled foil, which is bent around the light source 2 partly or completely around it. It is also possible to use a plurality of coaxial bodies 3 enclosing or surrounding each other (adjacent or with play), so that a cascading their effects, ie an enlargement of the shading angle 13 results.

Die Lichtquelle 1 kann auch einen anderen als kreisförmigen Querschnitt haben und muß nicht koaxial zum Körper 3 angeordnet sein.The light source 1 may also have other than circular cross-section and need not be arranged coaxially with the body 3.

Unter dem Begriff "rohrförmiger" Körper 3 wird nicht nur ein zylindrisch rohrförmiger Körper verstanden, sondern ein allgemein rohrförmiger Körper, z.B. mit elliptischem Profil, abgerundet-eckigem Profil usw.By the term "tubular" body 3 is meant not only a cylindrical tubular body, but a generally tubular body, e.g. with elliptical profile, rounded-cornered profile etc.

Der Körper 3 kann anders als dargestellt an der Lichtquelle 1 anliegen, d.h. die zwischen den Flanken 6, 7 benachbarter Riefen 5 gebildeten Scheitel 14 liegen an der Außenoberfläche der Lichtquelle 1 an. Alternativ kann der Körper 3 einstückig mit der Außenwand der Lichtquelle 1 ausgeführt werden, beispielsweise als Hülle einer Leuchtstoffröhre.The body 3 may be opposed to the light source 1, as shown, i. the apexes 14 formed between the flanks 6, 7 of adjacent grooves 5 rest on the outer surface of the light source 1. Alternatively, the body 3 may be made integral with the outer wall of the light source 1, for example, as a shell of a fluorescent tube.

In einer beispielhaften Ausführungsform mit 20 Riefen, einem Brechungsindex von n = 1,5; einem Flankenwinkel (ϕ1 + ϕ2)/2 von etwa 43° und Verhältnissen von R1<R2 0,5 bis 2,0; R2/RL =1,4 bis 1,7 und R3/RL so klein wie möglich wurde eine axiale Abschattung 13 von etwa 60° (Kegelscheitelwinkel) erreicht.In an exemplary embodiment with 20 grooves, a refractive index of n = 1.5; a flank angle (φ 1 + φ 2 ) / 2 of about 43 ° and ratios of R 1 <R 2 0.5 to 2.0; R 2 / R L = 1.4 to 1.7 and R 3 / R L as small as possible, an axial shading 13 of about 60 ° (cone vertex angle) has been achieved.

Claims (8)

  1. Device for light guidance for a longitudinally extended light source (1), in particular fluorescent tubes with a substantially tubular or tube-sector-shaped body (3) made out of transparent material for the substantially coaxial housing of the light source (1), which on its internal side is provided with axial-parallel adjacent grooves (5), notches or similar having edges (6, 7) which when viewed in an axial-normal section are inclined at an angle (Φ1, Φ2) of 40° to 46°, preferably 43°, to the radial direction (8), characterised in that the grooves (5) have concave edges (6, 7) when viewed in an axial-normal direction.
  2. Device according to claim 1, characterised in that the grooves (5) are uniformly distributed over the internal circumference of the body (3).
  3. Device according to either claim 1 or claim 2, characterised in that at least 20 grooves (5) are provided.
  4. Device according to claim 1, 2 or 3, characterised in that the radius (R1) of the edges (6, 7) is 0.5 to 2.0 times the distance (R2) between the half-depth of the grooves (5) and the axis (2) of the body (3).
  5. Device according to any one of claims 1 to 4, characterised in that the refractive index of the transparent material is at least 1.45.
  6. Light fitting with a longitudinally extended light source (1), in particular a fluorescent tube which is overlapped by a roof-type reflector (4), characterised by a device according to any one of claims 1 to 5 with a substantially tubular body (3) surrounding the light source (1).
  7. Light fitting with a longitudinally extended light source (1), in particular a fluorescent tube which is overlapped by a roof-type reflector (4), characterised by a device according to any one of claims 1 to 5 with a substantially tube-sector shaped body (3) surrounding the light source (1) on its side facing away from the reflector (4).
  8. Light fitting according to either of claims 6 or 7 with a cylindrical light source, characterised in that the distance (R2) between the half-depth of the grooves (5) and the axis (2) of the body (3) is 1. 4 to 1.7 times the radius (RL) of the light source (1) to be housed.
EP99917682A 1998-04-29 1999-04-29 Light guiding device for an oblong light source Expired - Lifetime EP1073862B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99917682A EP1073862B2 (en) 1998-04-29 1999-04-29 Light guiding device for an oblong light source

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
AT28098 1998-02-17
AT28098 1998-04-29
EP98890139 1998-05-12
EP98890139A EP0953800A1 (en) 1998-04-29 1998-05-12 Apparatus for controlling the light emitted by an elongated light source
PCT/AT1999/000107 WO1999056058A1 (en) 1998-04-29 1999-04-29 Light guiding device for an oblong light source
EP99917682A EP1073862B2 (en) 1998-04-29 1999-04-29 Light guiding device for an oblong light source

Publications (3)

Publication Number Publication Date
EP1073862A1 EP1073862A1 (en) 2001-02-07
EP1073862B1 EP1073862B1 (en) 2003-03-19
EP1073862B2 true EP1073862B2 (en) 2007-03-14

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ID=3486349

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EP98890139A Withdrawn EP0953800A1 (en) 1998-04-29 1998-05-12 Apparatus for controlling the light emitted by an elongated light source
EP99917682A Expired - Lifetime EP1073862B2 (en) 1998-04-29 1999-04-29 Light guiding device for an oblong light source

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP98890139A Withdrawn EP0953800A1 (en) 1998-04-29 1998-05-12 Apparatus for controlling the light emitted by an elongated light source

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US (1) US6400086B1 (en)
EP (2) EP0953800A1 (en)
AT (1) ATE235019T1 (en)
AU (1) AU755027B2 (en)
DK (1) DK1073862T4 (en)
ES (1) ES2195562T5 (en)
NZ (1) NZ507603A (en)
WO (1) WO1999056058A1 (en)

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US7658514B2 (en) * 2006-04-13 2010-02-09 Lg Electronics Inc. Light guide, method and apparatus for manufacturing the same, and illuminating system having the same
US9366396B2 (en) 2013-01-30 2016-06-14 Cree, Inc. Optical waveguide and lamp including same
US10436969B2 (en) 2013-01-30 2019-10-08 Ideal Industries Lighting Llc Optical waveguide and luminaire incorporating same
US9869432B2 (en) 2013-01-30 2018-01-16 Cree, Inc. Luminaires using waveguide bodies and optical elements
US9291320B2 (en) 2013-01-30 2016-03-22 Cree, Inc. Consolidated troffer
US9625638B2 (en) 2013-03-15 2017-04-18 Cree, Inc. Optical waveguide body
US9690029B2 (en) * 2013-01-30 2017-06-27 Cree, Inc. Optical waveguides and luminaires incorporating same
US9442243B2 (en) 2013-01-30 2016-09-13 Cree, Inc. Waveguide bodies including redirection features and methods of producing same
US9645303B2 (en) 2013-03-15 2017-05-09 Cree, Inc. Luminaires utilizing edge coupling
US10400984B2 (en) 2013-03-15 2019-09-03 Cree, Inc. LED light fixture and unitary optic member therefor
US9798072B2 (en) 2013-03-15 2017-10-24 Cree, Inc. Optical element and method of forming an optical element
US9920901B2 (en) 2013-03-15 2018-03-20 Cree, Inc. LED lensing arrangement
US10209429B2 (en) 2013-03-15 2019-02-19 Cree, Inc. Luminaire with selectable luminous intensity pattern
US10379278B2 (en) * 2013-03-15 2019-08-13 Ideal Industries Lighting Llc Outdoor and/or enclosed structure LED luminaire outdoor and/or enclosed structure LED luminaire having outward illumination
US9366799B2 (en) 2013-03-15 2016-06-14 Cree, Inc. Optical waveguide bodies and luminaires utilizing same
US10502899B2 (en) * 2013-03-15 2019-12-10 Ideal Industries Lighting Llc Outdoor and/or enclosed structure LED luminaire
US10436970B2 (en) 2013-03-15 2019-10-08 Ideal Industries Lighting Llc Shaped optical waveguide bodies
US10416377B2 (en) 2016-05-06 2019-09-17 Cree, Inc. Luminaire with controllable light emission
US11719882B2 (en) 2016-05-06 2023-08-08 Ideal Industries Lighting Llc Waveguide-based light sources with dynamic beam shaping
US10739513B2 (en) 2018-08-31 2020-08-11 RAB Lighting Inc. Apparatuses and methods for efficiently directing light toward and away from a mounting surface
US10801679B2 (en) 2018-10-08 2020-10-13 RAB Lighting Inc. Apparatuses and methods for assembling luminaires

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Also Published As

Publication number Publication date
EP1073862B1 (en) 2003-03-19
EP0953800A1 (en) 1999-11-03
ES2195562T3 (en) 2003-12-01
US6400086B1 (en) 2002-06-04
ES2195562T5 (en) 2007-11-01
AU3588699A (en) 1999-11-16
NZ507603A (en) 2002-05-31
WO1999056058A1 (en) 1999-11-04
DK1073862T4 (en) 2007-07-16
EP1073862A1 (en) 2001-02-07
DK1073862T3 (en) 2003-06-23
AU755027B2 (en) 2002-11-28
ATE235019T1 (en) 2003-04-15

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