EP1073862B1 - 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
EP1073862B1
EP1073862B1 EP99917682A EP99917682A EP1073862B1 EP 1073862 B1 EP1073862 B1 EP 1073862B1 EP 99917682 A EP99917682 A EP 99917682A EP 99917682 A EP99917682 A EP 99917682A EP 1073862 B1 EP1073862 B1 EP 1073862B1
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EP
European Patent Office
Prior art keywords
light source
grooves
light
axis
reflector
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EP99917682A
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German (de)
French (fr)
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EP1073862B2 (en
EP1073862A1 (en
Inventor
Johannes Huter
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ZUMTOBEL LIGHTING GmbH
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Zumtobel Staff GmbH
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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 Light guidance for an elongated light source, in particular Fluorescent tube, with an essentially tubular or tubular sector-shaped Essentially made of transparent material coaxial shot of the light source on the inside with axially parallel, adjacent grooves, notches or the like. is provided, which flanks have.
  • a device of the type mentioned is from the CH 389 538 known.
  • the Grooves for scattering or fanning out the light distribution in axial normal direction to the luminous flux density immediately under the light source is achieved by using sharp grooves with an apex angle of approx. 60 ° can be used.
  • the question of light dimming relative this document does not refer to the axial direction of the light source addressed.
  • a light guide is often desired in order to to maintain the specified radiation angle, outside of which one extensive suppression of that emitted by the light source Light is done.
  • These can be refracting or reflecting Devices are used; a well-known type of reflective Devices are mirror grids made of longitudinal and transverse reflector slats. Combinations of refractory and reflective devices are possible.
  • the invention aims to be a refractory To create light guiding device, which is an inexpensive It represents an alternative to grid luminaires.
  • flanks of the grooves are in an axially normal Section seen at an angle of 40 ° to 46 °, preferably 43 °, are inclined with respect to the radial direction.
  • this structure causes a redirection of Light rays near the axial direction closer to one of the radials Direction.
  • the light radiation from such a device (at least partially) encased fluorescent tube is in hidden an angular cone around the axial, i.e. the beam angle normal to the fluorescent tube axis (e.g. downwards) is restricted.
  • the result can be that of mirror louvres customary axially normal slats dispensed with be because the light guide device according to the invention Longitudinal light suppression takes over.
  • the grooves are preferred evenly over the inner circumference of the body, and are particularly preferred at least 20 marks provided. This will make the light distribution evened over the radiation range.
  • the distance between half the depth of the grooves is preferred and axis of the body 1.4 to 1.7 times the radius of the light source to be recorded, which is a particularly compact design allows.
  • the refractive index the transparent material is at least 1.45, which has a larger shading angle, i.e. a lesser Beam angle allows.
  • Another aspect of the invention is the creation a lamp with an elongated light source, in particular Fluorescent tube by a roof-like reflector is overlapped and with a light guide device according to the invention is equipped with a tubular body, which encloses the light source. If a light guiding device is used with tubular sector-shaped body, this surrounds the Light source on its side facing away from the reflector.
  • the length of the lamp shown in section in Fig. 1 in The direction of axis 2 can be chosen freely.
  • a fluorescent tube is any known form of an "elongated Light source "possible, e.g. halogen rods, chains from individual light sources such as incandescent lamps, etc.
  • the axis 2 of the Light source 1 need not necessarily be straight, but can also be slightly curved or polygonal, in which Cases of the body 3 according to the course of the light source 1 is adjusted.
  • the inside of the body 3 is parallel to the axis 2 running, adjacent grooves 5, notches or the like. Mistake. In the example shown, 12 grooves are 5 evenly distributed over the inner circumference of the body 3.
  • the grooves 5 have concave flanks 6, 7, seen 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 the Grooves 5 and the common axis 2 of light source 1 and body 3.
  • the average angle ( ⁇ 1 + ⁇ 2 ) / 2 of the flanks 6, 7 to the radial 8 is in the range of 40 ° - 46 °, preferably about 43 °.
  • the distance R 2 between approximately half the depth of the grooves 5 and the common axis 2 of the light source 1 and body 3 is approximately 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 to be as low as possible, ie in such a way that there is just sufficient strength for the body 3.
  • the valley bottoms 9 of the grooves 5 therefore extend close to the outer circumference of the body 3.
  • the number of grooves 5 can be chosen as large as desired and is limited in practice by manufacturing restrictions.
  • the flanks 6, 7 of the grooves 5 can of course also just be trained.
  • 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, an example of which is shown in FIG. 2 is shown.
  • the body 3 shines in each Direction perpendicular to the axis wider than light source 1.
  • FIGS. 4 and 5 show a spatial representation of the Combination of the refraction effects outlined in FIGS. 1 and 2. All rays of light coming from a point 10 on the light source 2 at a cone shell angle 11 based on the axis 2 go out (Fig. 4), with the interposition of the body 3rd (Fig. 5) in the form of a "compressed" cone shell 12, a shading cone 13 is formed about the axis 2.
  • the shading cone 13 produces a downward limitation of the radiation angle of the lamp shown in FIG. 1 normal to the plane of the drawing in FIG. 1, as could otherwise only be achieved by axially normal transverse lamellae within the reflector 4.
  • the shading in the axial direction is advantageous Effect because the light rays deflected from the shading area the radiation intensity of the light source / body arrangement increase on the reflector 4 so that it is better used becomes.
  • a special advantage arises in connection with reflectors which do not measure the angle of rays to the axis change the apex angle of the shading cone of the entire Luminaire is therefore not smaller than that of the light guide.
  • axially normal flat reflectors which as bilateral Conclusion of the reflector 4 serve, or axially parallel trough-shaped reflectors, where every point of the Reflector has an axially parallel tangential plane on which the angle of each beam to the axis is only mirrored, but the amount does not change. With such reflectors the longitudinal blanking of the light guide is not reduced.
  • the body 3 do not enclose the light source 2 on all sides, for example it is sufficient a tubular sector body, which is the light source 2 e.g. partially ring-shaped on its side facing away from the reflector 4 surrounds, for example 1/4, half or 3.4.
  • both the reflector and the body coinciding open spaces, axially parallel slots or open sectors, etc., which have an unobstructed passage enable certain light rays from the light source.
  • This variant is for example for suspended ceiling lights useful where the body and the reflector are on the top have a longitudinal slot through which the ceiling of is illuminated directly below, thereby creating a partially indirect To create lighting in the room.
  • the body 3 can be extruded from a transparent plastic become. Alternatively, the body 3 can be made accordingly profiled film are made, which around the Light source 2 partially or completely bent around becomes. It is also possible to have several coaxial bodies 3 with each other surrounding or surrounding (adjacent or with play) use, so that cascading their effects, i. a Increasing the shading angle 13 results.
  • the light source 1 can also be other than circular Have cross section and need not be arranged coaxially to the body 3 his.
  • tubular body 3 is not only understood a cylindrical tubular body, but a generally tubular body, e.g. with elliptical profile, rounded square profile etc.
  • the body 3 can be different from that shown at the light source 1, i.e. the neighboring between the flanks 6, 7 Grooves 5 formed apex 14 lie on the outer surface the light source 1.
  • the body 3 can be made in one piece with the outer wall of the light source 1, for example as a cover for a fluorescent tube.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Eye Examination Apparatus (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Planar Illumination Modules (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Endoscopes (AREA)

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.The present invention relates to a device for Light guidance for an elongated light source, in particular Fluorescent tube, with an essentially tubular or tubular sector-shaped Essentially made of transparent material coaxial shot of the light source on the inside with axially parallel, adjacent grooves, notches or the like. is provided, which flanks have.

Eine Vorrichtung der einleitend genannten Art ist aus der CH 389 538 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 Breitstreuwirkung wird erreicht, indem spitze Riefen mit einem Scheitelwinkel von ca. 60° verwendet werden. Die Frage einer Lichtabblendung relativ zur Axialrichtung der Lichtquelle wird in dieser Schrift nicht angesprochen.A device of the type mentioned is from the CH 389 538 known. In the known device, the Grooves for scattering or fanning out the light distribution in axial normal direction to the luminous flux density immediately under the light source. The spreading effect is achieved by using sharp grooves with an apex angle of approx. 60 ° can be used. The question of light dimming relative this document does not refer to the axial direction of the light source addressed.

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.With elongated light sources, such as fluorescent tubes, In practice, a light guide is often desired in order to to maintain the specified radiation angle, outside of which one extensive suppression of that emitted by the light source Light is done. These can be refracting or reflecting Devices are used; a well-known type of reflective Devices are mirror grids made of longitudinal and transverse reflector slats. Combinations of refractory and reflective devices are possible.

Die Erfindung setzt sich zum Ziel, eine refraktierende Lichtführungsvorrichtung zu schaffen, welche eine kostengünstige Alternative zu Spiegelrasterleuchten darstellt.The invention aims to be a refractory To create light guiding device, which is an inexpensive It represents an alternative to grid luminaires.

Dieses Ziel wird mit einer Vorrichtung der einleitend genannten Art erreicht, die sich gemäß der Erfindung dadurch auszeichnet, daß die Flanken der Riefen in einem axialnormalen Schnitt gesehen in einem Winkel von 40° bis 46°, bevorzugt 43°, gegenüber der Radialrichtung geneigt sind.This goal is achieved with a device of the introduction Achieved type, which is characterized according to the invention, that the flanks of the grooves are in an axially normal Section seen at an angle of 40 ° to 46 °, preferably 43 °, are inclined with respect to the radial direction.

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 constant over the longitudinal direction of the body Profile, the mode of operation of which is described in more detail later becomes. In effect, this structure causes a redirection of Light rays near the axial direction closer to one of the radials Direction. The light radiation from such a device (at least partially) encased fluorescent tube is in hidden an angular cone around the axial, i.e. the beam angle normal to the fluorescent tube axis (e.g. downwards) is restricted. The result can be that of mirror louvres customary axially normal slats dispensed with be because the light guide device according to the invention Longitudinal light suppression takes over.

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.The grooves are preferred evenly over the inner circumference of the body, and are particularly preferred at least 20 marks provided. This will make the light distribution evened over the radiation range.

Eine bevorzugte Ausführungsform der Erfindung zeichnet sich dadurch aus, 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. Bevorzugt beträgt der Radius der Flanken das 0,5- bis 2,0-fache des Abstandes zwischen halber Tiefe der Riefen und Achse des Körpers.A preferred embodiment of the invention is characterized is characterized in that the grooves in an axially normal section seen have concave flanks. This can reduce the scattering properties the groove structures are minimized what the shading limit tightened, and the overall light transmittance (= Efficiency) is maximized. Is preferably the radius of the flanks 0.5 to 2.0 times the distance between half depth of the grooves and 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.The distance between half the depth of the grooves is preferred and axis of the body 1.4 to 1.7 times the radius of the light source to be recorded, which is a particularly compact design allows.

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 the transparent material is at least 1.45, which has a larger shading angle, i.e. a lesser Beam angle allows.

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 the creation a lamp with an elongated light source, in particular Fluorescent tube by a roof-like reflector is overlapped and with a light guide device according to the invention is equipped with a tubular body, which encloses the light source. If a light guiding device is used with tubular sector-shaped body, 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 is explained 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 from FIG. 1 in a schematic side view,
  • Fig. 3 dimensioning relationships on an exemplary sector of the light guide device in a section similar to FIG. 1, and
  • 4 and 5 schematic radiation conditions from a point of the light source without (Fig. 4) or with (Fig. 5) light guiding 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.The lamp shown in FIGS. 1 and 2 contains a elongated light source 1 in the form of a fluorescent tube a longitudinal axis 2, which in the interior of a substantially tubular body 3 made of transparent material with a Refractive index of e.g. n = 1.5 coaxially arranged with play is. Covering the light source 1 and the body 3 like a roof or encompassing a trough, inverted U or partially parabolic Reflector 4 of conventional design 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 axis 2 can be chosen freely. Instead of A fluorescent tube is any known form of an "elongated Light source "possible, e.g. halogen rods, chains from individual light sources such as incandescent lamps, etc. The axis 2 of the Light source 1 need not necessarily be straight, but can also be slightly curved or polygonal, in which Cases of the body 3 according to the course of the light source 1 is adjusted.

    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 inside of the body 3 is parallel to the axis 2 running, adjacent grooves 5, notches or the like. Mistake. In the example shown, 12 grooves are 5 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, seen 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 the Grooves 5 and the common axis 2 of light source 1 and body 3. The average angle (ϕ 1 + ϕ 2 ) / 2 of the flanks 6, 7 to the radial 8 is in the range of 40 ° - 46 °, preferably about 43 °. The distance R 2 between approximately half the depth of the grooves 5 and the common axis 2 of the light source 1 and body 3 is approximately 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 to be as low as possible, ie in such a way that there is just sufficient strength for the body 3. The valley bottoms 9 of the grooves 5 therefore extend close to the outer circumference of the body 3.

    Die Anzahl der Riefen 5 kann beliebig groß gewählt werden und ist in der Praxis durch Fertigungseinschränkungen begrenzt. Die Flanken 6, 7 der Riefen 5 können selbstverständlich auch eben ausgebildet sein.The number of grooves 5 can be chosen as large as desired and is limited in practice by manufacturing restrictions. The flanks 6, 7 of the grooves 5 can of course also just be trained.

    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, an example of which is 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 in more detail in the radial direction 8 deflected 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 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 refraction effects outlined in FIGS. 1 and 2. All rays of light coming from a point 10 on the light source 2 at a cone shell angle 11 based on the axis 2 go out (Fig. 4), with the interposition of the body 3rd (Fig. 5) in the form of a "compressed" cone shell 12, a shading cone 13 is formed about the axis 2.

    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 downward limitation of the radiation angle of the lamp shown in FIG. 1 normal to the plane of the drawing in FIG. 1, as could otherwise only be achieved by axially normal transverse lamellae within the reflector 4. An advantage of this light guide is that from a size of approx. R 2 = 1.4 x R L practically all light leaves the light guide, ie hardly any shading losses occur, such as those caused by the reflection in the light source from the cross louvres of a mirror louvre lamp 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 upwards, i.e. facing the reflector 4, the shading in the axial direction is advantageous Effect because the light rays deflected from the shading area the radiation intensity of the light source / body arrangement increase on the reflector 4 so that it is better used becomes. A special advantage arises in connection with reflectors which do not measure the angle of rays to the axis change the apex angle of the shading cone of the entire Luminaire is therefore not smaller than that of the light guide. These are e.g. axially normal flat reflectors, which as bilateral Conclusion of the reflector 4 serve, or axially parallel trough-shaped reflectors, where every point of the Reflector has an axially parallel tangential plane on which the angle of each beam to the axis is only mirrored, but the amount does not change. With such reflectors the longitudinal blanking 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 do not enclose the light source 2 on all sides, for example it is sufficient a tubular sector body, which is the light source 2 e.g. partially ring-shaped on its side facing away from the reflector 4 surrounds, for example 1/4, half or 3.4. Alternatively, both the reflector and the body coinciding open spaces, axially parallel slots or open sectors, etc., which have an unobstructed passage enable certain light rays from the light source. This variant is for example for suspended ceiling lights useful where the body and the reflector are on the top have a longitudinal slot through which the ceiling of is illuminated directly below, thereby creating a partially indirect To create lighting in 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 become. Alternatively, the body 3 can be made accordingly profiled film are made, which around the Light source 2 partially or completely bent around becomes. It is also possible to have several coaxial bodies 3 with each other surrounding or surrounding (adjacent or with play) use, so that cascading their effects, i. a Increasing 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 can also be other than circular Have cross section and need not be arranged coaxially to the body 3 his.

    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.The term "tubular" body 3 is not only understood a cylindrical tubular body, but a generally tubular body, e.g. with elliptical profile, rounded square 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 can be different from that shown at the light source 1, i.e. the neighboring between the flanks 6, 7 Grooves 5 formed apex 14 lie on the outer surface the light source 1. Alternatively, the body 3 can be made in one piece with the outer wall of the light source 1, for example as a cover for 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 striations, a refractive index of n = 1.5; a flank angle (ϕ 1 + ϕ 2 ) / 2 of approximately 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 approximately 60 ° (cone apex angle) was achieved.

    Claims (9)

    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), characterised in that the edges (6, 7) of the grooves (5), notches or similar when viewed in an axial-normal section are inclined at an angle (1, 2) of 40° to 46°, preferably 43°, to the radial direction (8).
    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 any one of claims 1 to 3, characterised in that the grooves (5) have concave edges (6, 7) when viewed in an axial-normal direction.
    5. Device according to claim 4, 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).
    6. Device according to any one of claims 1 to 5 characterised in that the refractive index of the transparent material is at least 1.45.
    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 6 with a substantially tubular body (3) surrounding the light source (1).
    8. 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 6 with a substantially tube-sector shaped body (3) surrounding the light source (1) on its side facing away from the reflector (4).
    9. Light fitting according to either of claims 7 or 8 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 1998-04-29
    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 true EP1073862B1 (en) 2003-03-19
    EP1073862B2 EP1073862B2 (en) 2007-03-14

    Family

    ID=3486349

    Family Applications (2)

    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
    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

    Country Status (8)

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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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    Also Published As

    Publication number Publication date
    DK1073862T4 (en) 2007-07-16
    DK1073862T3 (en) 2003-06-23
    AU3588699A (en) 1999-11-16
    EP0953800A1 (en) 1999-11-03
    EP1073862B2 (en) 2007-03-14
    EP1073862A1 (en) 2001-02-07
    AU755027B2 (en) 2002-11-28
    WO1999056058A1 (en) 1999-11-04
    ES2195562T5 (en) 2007-11-01
    NZ507603A (en) 2002-05-31
    ATE235019T1 (en) 2003-04-15
    ES2195562T3 (en) 2003-12-01
    US6400086B1 (en) 2002-06-04

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