EP1361391B1 - Lamp for illuminating a workstation - Google Patents

Lamp for illuminating a workstation Download PDF

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Publication number
EP1361391B1
EP1361391B1 EP03004083A EP03004083A EP1361391B1 EP 1361391 B1 EP1361391 B1 EP 1361391B1 EP 03004083 A EP03004083 A EP 03004083A EP 03004083 A EP03004083 A EP 03004083A EP 1361391 B1 EP1361391 B1 EP 1361391B1
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EP
European Patent Office
Prior art keywords
light
lighting means
luminaire
work surface
lamp
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EP03004083A
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German (de)
French (fr)
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EP1361391A2 (en
EP1361391A3 (en
Inventor
Katharina Keller
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ZUMTOBEL LIGHTING GmbH
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Zumtobel Lighting GmbH Austria
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Publication of EP1361391A3 publication Critical patent/EP1361391A3/en
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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
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/402—Lighting for industrial, commercial, recreational or military use for working places
    • 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
    • F21Y2105/00—Planar light sources
    • 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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • F21Y2115/15—Organic light-emitting diodes [OLED]

Definitions

  • the present invention relates to a luminaire for illuminating a workstation with a flat illuminant.
  • ceiling lights are generally used, which illuminate the rooms as a whole.
  • a general room lighting is often not sufficient. Rather, an individual lighting of the workplace is required, which is obtained by additional lights.
  • table lamps which have an adjustable lamp arm, at the end of which is arranged in a reflector light source.
  • This lighting arm has a disturbing effect insofar as it requires a certain amount of space at the desk.
  • the light source is an additional heat source located approximately at head height, which interferes with the work in the workplace.
  • this luminous means may be an electroluminescent luminous layer made of an inorganic or an organic semiconductor material.
  • the luminescent layers of an inorganic semiconductor material represent a further development of the known point-shaped LEDs, the luminescent means consisting of an organic semiconductor layer are often also referred to as so-called OLEDs (organic LEDs).
  • OLEDs organic LEDs
  • Luminaires with such flat bulbs are for example from the DE 198 26 548A1 or the EP 0 756 132 A1 known. Compared with the conventional luminaires with incandescent bulbs or fluorescent tubes as light sources, these luminaires are characterized by their shallow depths with flat illuminants. Since both the organic and the inorganic bulbs are very flat, lights can be created, which have a total depth of only 0.5 to 3 cm. Another advantage of such lights is the comparatively very small heat development.
  • JP 2001-325805 A is a hinged floor lamp for lighting a work surface known.
  • the lamp can be placed in the unfolded state on the work surface, so that a light source of the lamp is arranged perpendicular to the plane of the work surface and the light emitted by the light source is emitted to the work surface.
  • a device for the illumination of theaters, TV studios or the like which has a surface element, which is designed as a light-emitting light-emitting diode.
  • the surface element can be arranged perpendicular to a work surface, so that the lamp is designed such that the light emitted by the light source is emitted to the plane perpendicular to the plane of the working surface.
  • a prismatic plate which is suitable as a light guide plate, for example, for a flat, electroluminescent light source.
  • the plate has a prism structure on its side facing away from the light source.
  • the radiation can preferably be directed in a direction that differs from the direction of the surface normal.
  • this prismatic plate the radiation in certain directions, in which no radiation is necessary to be weakened.
  • a vehicle headlamp is described with a light source in the form of a flexible LED, which can be adapted to wide areas of the surface of a body.
  • a workplace lamp in the form of a flat, downward-emitting light box is known.
  • a tubular light-emitting means is arranged between a rear plate and a rear side illuminated, in front of the rear side illuminated glass plate, wherein on the glass plate is a prism sheet.
  • the present invention has for its object to provide a luminaire with a flat illuminant, which is suitable for illuminating workstations.
  • a luminaire which has the features of claim 1. This is characterized by the fact that the light emitted by the planar illuminant is radiated onto a plane which is substantially perpendicular to the plane of the illuminant and which represents the work surface to be illuminated.
  • the luminaire thus has an asymmetrical light emission which ensures that the light emitted by the luminous means is only used to illuminate the workstation and does not lead to disruptive glare effects for a user located at the workstation.
  • the luminaire according to the invention can be arranged, for example, on the edge of a work table. Due to its very small depth, it takes up little space and therefore has less disturbing effect than conventional table lamps.
  • the desired asymmetrical emission characteristic of the luminaire according to the invention can be achieved, for example, by arranging a light guide plate in front of the planar luminous means, which deflects the light emitted by the luminous means onto the work surface to be illuminated.
  • the deflection of the light can be obtained, for example, by means of a prism structure arranged at the light exit surface or the side of the light guide plate facing away from the light source.
  • An alternative possibility is to bend the light source at its end remote from the worktop to be illuminated facing the work surface.
  • an opaque back plate is provided on the back of the lamp, which prevents unwanted emission of light to the back.
  • the luminous means can be, for example, a layer of an inorganic semiconductor material or of an organic semiconductor material. In both cases, it is possible to change the color temperature of the emitted light by changing the field strength applied to the semiconductor layer.
  • An advantageous development of the luminaire according to the invention then consists in using a device for manual adjustment of the light color, for example a switch or rotary control. Alternatively, however, the control of the optical fiber can also be done via a sensor.
  • the lamp 1 is provided for illuminating a workplace 6 in the form of a desk 7.
  • the lamp 1 is arranged in the example shown on a longitudinal side of the desk 7 and has the shape of a flat rectangular disk.
  • other shapes for the lamp 1 would be conceivable. For example, this could have a circular shape or the shape of an ellipse.
  • the lamp 1 is perpendicular to the illuminated table top 8 of the desk 7.
  • the radiation of the light emitted by the luminaire 1 is such that the light falls exclusively on the table plate 8 arranged perpendicular to the luminaire 1, so that a trapezoidal region 9 is illuminated on it.
  • a radiation perpendicular to the plane of the lamp 1, however, does not occur, so that a person sitting on the opposite longitudinal side of the desk 7 person is not dazzled.
  • Fig. 2 shows the structural design of the luminaire 1 according to the invention.
  • the light is thereby generated a flat layer of a planar luminous means 2.
  • This luminous means 2 is an electroluminescent layer of an inorganic or organic semiconductor material, for example a thin OLED film.
  • On both sides of this layer 2 are electrode layers (not shown), with the aid of which an electric field applied across the semiconductor layer 2 is generated.
  • This electric field is responsible for the light generation in the semiconductor layer 2.
  • the color of the light generated by the light source 2 is influenced, inter alia, by the field strength of the electric field. There is thus the possibility of adjusting the color temperature of the light emitted by the lamp 1 individually, which can be done for example by a manual control of the electric field strength or automatically via a corresponding sensor.
  • a light source 2 arranged in front of the light source
  • This consists of a transparent material, such as plastic or glass and has a prism structure 5 on its light exit side.
  • the preferably integrally connected to the plate-shaped core of the light guide plate 4 micro-prisms 5 have an asymmetric structure, so that emerging from the micro-prisms 5 light rays are broken down or in the direction of the working surface to be illuminated. In Fig. 2 this is illustrated by way of example with reference to the light beam S 1.
  • an opaque back plate 3 is arranged, which prevents radiation of light to the rear.
  • the entire structure has a very small depth of, for example, 5mm to 3cm.
  • the light guide plate 4, at the back of the lamp 2, the associated electrode layers and the back plate 3 can be applied in the form of thin films.
  • a second embodiment of a luminaire according to the invention is in Fig. 3 shown.
  • the lamp 11 is curved at its end facing away from the working surface 8 to be illuminated end to the work surface 8 out.
  • the steering of the light emitted from the lamp 11 light is improved on the table top. It is then even possible to dispense with the above-explained light guide plate with the micro-prism structure.
  • the use of such a light-deflecting plate is also advantageous in this exemplary embodiment, since the radiation of the light emitted by the luminaire 1 is thereby better determined and the trapezoidal region 12 produced on the working surface 8 can be specified better.
  • the luminaire has in this case an identical structure as in Fig. 1 and 2 illustrated light.
  • the present invention thus provides an extremely flat luminaire for illuminating a workstation which requires little space and at the same time provides optimal illumination.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Planar Illumination Modules (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The light (1) has a flat light source and is designed so that the light emitted by the light source is radiated onto the working position (6), which is essentially perpendicular to the plane of the light source. A light deflection plate of transparent material is arranged in front of the light source deflects the light from the source onto the working surface (8) to be illuminated.

Description

Die vorliegende Erfindung betrifft eine Leuchte zur Beleuchtung eines Arbeitsplatzes mit einem flächigen Leuchtmittel.The present invention relates to a luminaire for illuminating a workstation with a flat illuminant.

Zur Beleuchtung von Arbeitsbereichen in Büros werden in der Regel Deckenleuchten verwendet, welche die Räume insgesamt ausleuchten. Für die Arbeit an individuellen Arbeitsplätzen, wie z. B. Schreibtischen ist allerdings eine derartige allgemeine Raumbeleuchtung oftmals nicht ausreichend. Vielmehr ist eine individuelle Beleuchtung des Arbeitsplatzes erforderlich, welche durch zusätzliche Leuchten erhalten wird.To illuminate workspaces in offices ceiling lights are generally used, which illuminate the rooms as a whole. For working on individual workplaces, such as As desks, however, such a general room lighting is often not sufficient. Rather, an individual lighting of the workplace is required, which is obtained by additional lights.

Zu einer individuellen Beleuchtung eines Schreibtisches werden beispielsweise Tischleuchten verwendet, welche einen verstellbaren Leuchtenarm aufweisen, an dessen Ende sich eine in einem Reflektor angeordnete Lichtquelle befindet. Dieser Leuchtenarm wirkt sich insofern störend aus, als er einen gewissen Platz an dem Schreibtisch beansprucht. Ferner stellt die Lichtquelle eine sich in etwa in Kopfhöhe befindende zusätzliche Wärmequelle dar, welche die Arbeit an dem Arbeitsplatz beeinträchtigt.For an individual lighting of a desk, for example table lamps are used, which have an adjustable lamp arm, at the end of which is arranged in a reflector light source. This lighting arm has a disturbing effect insofar as it requires a certain amount of space at the desk. Furthermore, the light source is an additional heat source located approximately at head height, which interferes with the work in the workplace.

In den letzten Jahren wurden neuartige Leuchtentypen entwickelt, welche als Lichtquelle ein flächiges Leuchtmittel verwenden. Bei diesem Leuchtmittel kann es sich beispielsweise um eine Elektrolumineszenz-Leuchtschicht aus einem anorganischen oder einem organischen Halbleitermaterial handeln. Die Leuchtschichten aus einem anorganischen Halbleitermaterial stellen eine Weiterentwicklung der bekannten punktförmigen LED's dar, die aus einer organischen Halbleiterschicht bestehenden Leuchtmittel werden oftmals auch als sog. OLED's (organische LED's) bezeichnet. Diese OLED's, bei denen es sich in der Regel um Polymere handelt, stehen beispielsweise in Form einer dünnen flexiblen Folie zur Verfügung.In recent years, novel types of luminaires have been developed which use a flat illuminant as the light source. By way of example, this luminous means may be an electroluminescent luminous layer made of an inorganic or an organic semiconductor material. The luminescent layers of an inorganic semiconductor material represent a further development of the known point-shaped LEDs, the luminescent means consisting of an organic semiconductor layer are often also referred to as so-called OLEDs (organic LEDs). These OLEDs, which are usually polymers, are available, for example, in the form of a thin flexible film.

Leuchten mit derartigen flächigen Leuchtmitteln sind beispielsweise aus der DE 198 26 548A1 oder der EP 0 756 132 A1 bekannt. Gegenüber den herkömmlichen Leuchten mit Glühbirnen oder Leuchtstoffröhren als Lichtquellen zeichnen sich diese Leuchten mit flächigen Leuchtmitteln durch ihre geringe Tiefe aus. Da sowohl die organischen als auch die anorganischen Leuchtmittel sehr flach sind, können Leuchten erstellt werden, die insgesamt lediglich eine Tiefe von 0,5 bis 3 cm aufweisen. Ein weiterer Vorteil derartiger Leuchten ist die vergleichsweise sehr geringfügige Wärmeentwicklung.Luminaires with such flat bulbs are for example from the DE 198 26 548A1 or the EP 0 756 132 A1 known. Compared with the conventional luminaires with incandescent bulbs or fluorescent tubes as light sources, these luminaires are characterized by their shallow depths with flat illuminants. Since both the organic and the inorganic bulbs are very flat, lights can be created, which have a total depth of only 0.5 to 3 cm. Another advantage of such lights is the comparatively very small heat development.

Aus dem japanischen Patentdokument JP 2001-325805 A ist eine klappbare Standleuchte zur Beleuchtung einer Arbeitsfläche bekannt. Die Leuchte kann in aufgeklapptem Zustand auf die Arbeitsfläche gestellt werden, so dass ein Leuchtmittel der Leuchte senkrecht zur Ebene der Arbeitsfläche angeordnet ist und das von dem Leuchtmittel abgegebene Licht auf die Arbeitsfläche abgestrahlt wird.From the Japanese patent document JP 2001-325805 A is a hinged floor lamp for lighting a work surface known. The lamp can be placed in the unfolded state on the work surface, so that a light source of the lamp is arranged perpendicular to the plane of the work surface and the light emitted by the light source is emitted to the work surface.

Aus der EP 0 848 206 A2 ist eine Vorrichtung zur Beleuchtung von Theaterbühnen, TV-Studios oder dergleichen bekannt, die ein Flächenelement aufweist, das als lichtabstrahlende Leuchtdiode ausgebildet ist. Das Flächenelement kann senkrecht zu einer Arbeitsfläche angeordnet werden, so dass die Leuchte derart ausgestaltet ist, dass das von dem Leuchtmittel abgegebene Licht auf die zur Ebene des Leuchtmittels senkrecht angeordnete Arbeitsfläche abgestrahlt wird.From the EP 0 848 206 A2 a device for the illumination of theaters, TV studios or the like is known, which has a surface element, which is designed as a light-emitting light-emitting diode. The surface element can be arranged perpendicular to a work surface, so that the lamp is designed such that the light emitted by the light source is emitted to the plane perpendicular to the plane of the working surface.

Aus dem japanischen Patentdokument JP 2001-357978 ist eine Prismenplatte bekannt, die sich als Lichtlenkplatte beispielsweise für ein flächiges, elektrolumineszentes Leuchtmittel eignet. Die Platte weist an ihrer dem Leuchtmittel abgewandten Seite eine Prismenstruktur auf. Mit der Lichtlenkplatte kann die Ausstrahlung bevorzugt in eine Richtung gelenkt werden, die sich von der Richtung der Flächennormalen unterscheidet. Mit dieser Prismenplatte kann die Abstrahlung in bestimmte Richtungen, in denen keine Abstrahlung notwendig ist, geschwächt werden.From the Japanese patent document JP 2001-357978 is known a prismatic plate, which is suitable as a light guide plate, for example, for a flat, electroluminescent light source. The plate has a prism structure on its side facing away from the light source. With the light guide plate, the radiation can preferably be directed in a direction that differs from the direction of the surface normal. With this prismatic plate, the radiation in certain directions, in which no radiation is necessary to be weakened.

In der EP 0 756 132 A1 ist ein Fahrzeugscheinwerfer mit einer Lichtquelle in Form einer biegsamen LED beschrieben, die in weiten Bereichen der Oberfläche einer Karosserie angepasst werden kann.In the EP 0 756 132 A1 a vehicle headlamp is described with a light source in the form of a flexible LED, which can be adapted to wide areas of the surface of a body.

Aus der DE 100 42 651 ist eine Arbeitsplatzleuchte in Form eines flachen, nach unten abstrahlenden Licht-Kastens bekannt. Ein röhrenförmiges Leuchtmittel ist dabei zwischen einer rückwärtigen Platte und einer abstrahlseitig parallel davor gelegenen, rückwärtig beleuchteten Glasplatte angeordnet, wobei auf der Glasplatte eine Prismenfolie liegt.From the DE 100 42 651 a workplace lamp in the form of a flat, downward-emitting light box is known. A tubular light-emitting means is arranged between a rear plate and a rear side illuminated, in front of the rear side illuminated glass plate, wherein on the glass plate is a prism sheet.

In dem Dokument US 5,656,823 sind Licht emittierende Dioden beschrieben, wobei auf anorganisches Halbleitermaterial und insbesondere auf verschiedene amorphe Halbleitermaterialien hingewiesen wird.In the document US 5,656,823 light-emitting diodes are described, reference being made to inorganic semiconductor material and in particular to various amorphous semiconductor materials.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Leuchte mit einem flächigen Leuchtmittel anzugeben, welche zur Beleuchtung von Arbeitsplätzen geeignet ist.The present invention has for its object to provide a luminaire with a flat illuminant, which is suitable for illuminating workstations.

Die Aufgabe wird durch eine Leuchte, welche die Merkmale des Anspruches 1 aufweist, gelöst. Diese zeichnet sich dadurch aus, dass das von dem flächigen Leuchtmittel abgegebene Licht auf eine zur Ebene des Leuchtmittels im wesentlichen senkrecht angeordnete Ebene, weiche die zu beleuchtende Arbeitsfläche darstellt, abgestrahlt wird. Die Leuchte weist somit eine asymmetrische Lichtabstrahlung auf, die sicherstellt, dass das von dem Leuchtmittel abgegebene Licht lediglich zur Ausleuchtung des Arbeitsplatzes verwendet wird und nicht zu störenden Blendeffekten für einen an dem Arbeitsplatz befindlichen Benutzer führt. Die erfindungsgemäße Leuchte kann beispielsweise an der Kante eines Arbeitstisches angeordnet werden. Aufgrund ihrer nur sehr geringen Tiefe beansprucht sie wenig Platz und wirkt sich daher weniger störend aus als herkömmliche Tischleuchten.The object is achieved by a luminaire, which has the features of claim 1. This is characterized by the fact that the light emitted by the planar illuminant is radiated onto a plane which is substantially perpendicular to the plane of the illuminant and which represents the work surface to be illuminated. The luminaire thus has an asymmetrical light emission which ensures that the light emitted by the luminous means is only used to illuminate the workstation and does not lead to disruptive glare effects for a user located at the workstation. The luminaire according to the invention can be arranged, for example, on the edge of a work table. Due to its very small depth, it takes up little space and therefore has less disturbing effect than conventional table lamps.

Die gewünschte asymmetrische Abstrahlcharakteristik der erfindungsgemäßen Leuchte kann beispielsweise dadurch erreicht werden, dass vor dem flächigen Leuchtmittel eine Lichtlenkplatte vorgeordnet ist, welche das von dem Leuchtmittel abgegebene Licht auf die zu beleuchtende Arbeitsfläche lenkt. Die Umlenkung des Lichts kann beispielsweise durch eine an der Lichtaustrittsfläche bzw. der dem Leuchtmittel abgewandten Seite der Lichtlenkplatte angeordnete Prismenstruktur erhalten werden. Eine alternative Möglichkeit besteht darin, das Leuchtmittel an seinem der zu beleuchtenden Arbeitsplatte abgewandten Ende zur Arbeitsfläche hin zu krümmen. Bei beiden Varianten ist an der Rückseite des Leuchtmittels eine lichtundurchlässige Rückplatte vorgesehen, welche ein ungewünschtes Abstrahlen von Licht zur Rückseite hin verhindert.The desired asymmetrical emission characteristic of the luminaire according to the invention can be achieved, for example, by arranging a light guide plate in front of the planar luminous means, which deflects the light emitted by the luminous means onto the work surface to be illuminated. The deflection of the light can be obtained, for example, by means of a prism structure arranged at the light exit surface or the side of the light guide plate facing away from the light source. An alternative possibility is to bend the light source at its end remote from the worktop to be illuminated facing the work surface. In both variants, an opaque back plate is provided on the back of the lamp, which prevents unwanted emission of light to the back.

Das Leuchtmittel kann beispielsweise eine Schicht aus einem anorganischen Halbleitermaterial oder aus einem organischen Halbleitermaterial sein. In beiden Fällen besteht die Möglichkeit, die Farbtemperatur des abgegebenen Lichts durch Veränderung der an die Halbleiterschicht angelegten Feldstärke zu verändern. Eine vorteilhafte Weiterbildung der erfindungsgemäßen Leuchte besteht dann darin, eine Vorrichtung zur manuellen Einstellung der Lichtfarbe, beispielsweise einen Schalter oder Drehregler zu verwenden. Alternativ dazu kann die Steuerung der Lichtfaser allerdings auch über einen Sensor erfolgen.The luminous means can be, for example, a layer of an inorganic semiconductor material or of an organic semiconductor material. In both cases, it is possible to change the color temperature of the emitted light by changing the field strength applied to the semiconductor layer. An advantageous development of the luminaire according to the invention then consists in using a device for manual adjustment of the light color, for example a switch or rotary control. Alternatively, however, the control of the optical fiber can also be done via a sensor.

Die Erfindung soll nachfolgend anhand der beiliegenden Zeichnung näher erläutert werden. Es zeigen:

Fig. 1
ein erstes Ausführungsbeispiel einer erfindungsgemäßen Leuchte zur Arbeitsplatzbeleuchtung;
Fig. 2
die in Fig. 1 dargestellte Leuchte im Schnitt; und
Fig. 3
ein zweites Ausführungsbeispiel einer erfindungsgemäßen Leuchte.
The invention will be explained in more detail with reference to the accompanying drawings. Show it:
Fig. 1
a first embodiment of a luminaire for workplace lighting according to the invention;
Fig. 2
in the Fig. 1 illustrated light in section; and
Fig. 3
A second embodiment of a lamp according to the invention.

Bei dem in Fig. 1 dargestellten Ausführungsbeispiel ist die Leuchte 1 zur Ausleuchtung eines Arbeitsplatzes 6 in Form eines Schreibtisches 7 vorgesehen. Die Leuchte 1 ist im dargestellten Beispiel an einer Längsseite des Schreibtisches 7 angeordnet und weist die Form einer flachen rechteckigen Scheibe auf. Selbstverständlich wären allerdings auch andere Formen für die Leuchte 1 denkbar. Beispielsweise könnte diese eine Kreisform oder die Form einer Ellipse aufweisen.At the in Fig. 1 illustrated embodiment, the lamp 1 is provided for illuminating a workplace 6 in the form of a desk 7. The lamp 1 is arranged in the example shown on a longitudinal side of the desk 7 and has the shape of a flat rectangular disk. Of course, however, other shapes for the lamp 1 would be conceivable. For example, this could have a circular shape or the shape of an ellipse.

Wie in Fig. 1 dargestellt ist, ist die Leuchte 1 senkrecht zu der zu beleuchtenden Tischplatte 8 des Schreibtisches 7 angeordnet. Die Abstrahlung des von der Leuchte 1 abgegebenen Lichts ist derart, dass das Licht ausschließlich auf die senkrecht zu der Leuchte 1 angeordnete Tischplatte 8 fällt, so dass auf diesem ein trapezartiger Bereich 9 ausgeleuchtet wird. Eine Abstrahlung senkrecht zur Ebene der Leuchte 1 erfolgt hingegen nicht, so dass eine an der gegenüberliegenden Längsseite des Schreibtisches 7 sitzende Person nicht geblendet wird.As in Fig. 1 is shown, the lamp 1 is perpendicular to the illuminated table top 8 of the desk 7. The radiation of the light emitted by the luminaire 1 is such that the light falls exclusively on the table plate 8 arranged perpendicular to the luminaire 1, so that a trapezoidal region 9 is illuminated on it. A radiation perpendicular to the plane of the lamp 1, however, does not occur, so that a person sitting on the opposite longitudinal side of the desk 7 person is not dazzled.

Fig. 2 zeigt den strukturellen Aufbau der erfindungsgemäßen Leuchte 1. Das Licht wird dabei eine flache Schicht eines flächigen Leuchtmittels 2 erzeugt. Bei diesem Leuchtmittel 2 handelt es sich um eine elektrolumineszierende Schicht aus einem anorganischen oder organischen Halbleitermaterial, beispielsweise um eine dünne OLED-Folie. Zu beiden Seiten dieser Schicht 2 befinden sich (nicht dargestellte) Elektrodenschichten, mit deren Hilfe ein über die Halbleiterschicht 2 anliegendes elektrisches Feld erzeugt wird. Dieses elektrische Feld ist für die Lichterzeugung in der Halbleiterschicht 2 verantwortlich. Die Farbe des von dem Leuchtmittel 2 erzeugten Lichts wird dabei u.a. durch die Feldstärke des elektrischen Feldes beeinflusst. Es besteht somit die Möglichkeit, die Farbtemperatur des von der Leuchte 1 abgegebenen Lichts individuell einzustellen, was beispielsweise durch eine manuelle Steuerung der elektrischen Feldstärke oder automatisch über einen entsprechenden Sensor erfolgen kann. Fig. 2 shows the structural design of the luminaire 1 according to the invention. The light is thereby generated a flat layer of a planar luminous means 2. This luminous means 2 is an electroluminescent layer of an inorganic or organic semiconductor material, for example a thin OLED film. On both sides of this layer 2 are electrode layers (not shown), with the aid of which an electric field applied across the semiconductor layer 2 is generated. This electric field is responsible for the light generation in the semiconductor layer 2. The color of the light generated by the light source 2 is influenced, inter alia, by the field strength of the electric field. There is thus the possibility of adjusting the color temperature of the light emitted by the lamp 1 individually, which can be done for example by a manual control of the electric field strength or automatically via a corresponding sensor.

Die Umlenkung des von dem Leuchtmittel 2 abgegebenen Lichts in Richtung der zu beleuchtenden Arbeitsfläche erfolgt über eine vor dem Leuchtmittel 2 angeordnete Lichtlenkplatte 4. Diese besteht aus einem transparenten Material, beispielsweise Kunststoff oder Glas und weist an ihrer Lichtaustrittsseite eine Prismenstruktur 5 auf. Die vorzugsweise einstückig mit dem plattenförmigen Kern der Lichtlenkplatte 4 verbundenen Mikroprismen 5 weisen eine asymmetrische Struktur auf, so dass aus den Mikroprismen 5 austretende Lichtstrahlen nach unten bzw. in Richtung der zu beleuchtenden Arbeitsfläche hin gebrochen werden. In Fig. 2 ist dies beispielhaft anhand des Lichtstrahls S 1 dargestellt.The deflection of the light emitted by the light source 2 in the direction of the work surface to be illuminated takes place via a light source 2 arranged in front of the light source This consists of a transparent material, such as plastic or glass and has a prism structure 5 on its light exit side. The preferably integrally connected to the plate-shaped core of the light guide plate 4 micro-prisms 5 have an asymmetric structure, so that emerging from the micro-prisms 5 light rays are broken down or in the direction of the working surface to be illuminated. In Fig. 2 this is illustrated by way of example with reference to the light beam S 1.

An der Rückseite des Leuchtmittels 2 ist eine lichtundurchlässige Rückplatte 3 angeordnet, die eine Abstrahlung von Licht nach hinten verhindert. Die gesamte Struktur weist eine sehr geringe Tiefe von beispielsweise 5mm bis 3cm auf. Den größten Anteil davon beansprucht die Lichtlenkplatte 4, an deren Rückseite das Leuchtmittel 2, die dazugehörigen Elektrodenschichten und die Rückplatte 3 in Form von dünnen Folien aufgebracht werden können.At the back of the lamp 2, an opaque back plate 3 is arranged, which prevents radiation of light to the rear. The entire structure has a very small depth of, for example, 5mm to 3cm. The largest proportion of these claims the light guide plate 4, at the back of the lamp 2, the associated electrode layers and the back plate 3 can be applied in the form of thin films.

Ein zweites Ausführungsbeispiel einer erfindungsgemäßen Leuchte ist in Fig. 3 dargestellt. In diesem Ausführungsbeispiel ist die Leuchte 11 an ihrem von der zu beleuchtenden Arbeitsfläche 8 abgewandten Ende zur Arbeitsfläche 8 hin gekrümmt. Hierdurch wird die Lenkung des von der Leuchte 11 abgegebenen Lichts auf die Tischplatte hin verbessert. Es besteht dann sogar die Möglichkeit, auf die zuvor erläuterte Lichtlenkplatte mit der Mikroprismenstruktur zu verzichten. Dennoch ist die Verwendung einer derartigen Lichtlenkplatte auch bei diesem Ausführungsbeispiel von Vorteil, da die Abstrahlung des von der Leuchte 1 abgegebenen Lichts hierdurch besser bestimmt und der auf der Arbeitsfläche 8 erzeugte trapezartige Bereich 12 besser vorgegeben werden kann. Die Leuchte weist in diesem Fall einen identischen Aufbau auf wie die in Fig. 1 und 2 dargestellte Leuchte.A second embodiment of a luminaire according to the invention is in Fig. 3 shown. In this embodiment, the lamp 11 is curved at its end facing away from the working surface 8 to be illuminated end to the work surface 8 out. As a result, the steering of the light emitted from the lamp 11 light is improved on the table top. It is then even possible to dispense with the above-explained light guide plate with the micro-prism structure. Nevertheless, the use of such a light-deflecting plate is also advantageous in this exemplary embodiment, since the radiation of the light emitted by the luminaire 1 is thereby better determined and the trapezoidal region 12 produced on the working surface 8 can be specified better. The luminaire has in this case an identical structure as in Fig. 1 and 2 illustrated light.

Insgesamt stellt somit die vorliegende Erfindung eine äußerst flache Leuchte zur Beleuchtung eines Arbeitsplatzes zur Verfügung, welche nur wenig Platz beansprucht und gleichzeitig für eine optimale Beleuchtung sorgt.Overall, the present invention thus provides an extremely flat luminaire for illuminating a workstation which requires little space and at the same time provides optimal illumination.

Claims (7)

  1. A luminaire (1, 11) for illuminating a work surface (8) with a planar lighting means (2),
    characterised in that
    the luminaire (1, 11) is configured in such a way that the light (S1) that is emitted from the lighting means (2) is radiated asymmetrically and is radiated onto the work surface (8) that is arranged substantially perpendicularly with respect to the plane of the lighting means (2),
    wherein the lighting means (2) is curved towards the work surface (8) at its end that is remote from the work surface (8) that is to be illuminated.
  2. A luminaire according to claim 1,
    characterised in that
    arranged in front of the lighting means (2) there is a light-directing plate (4) which consists of a transparent material and directs the light (S1) that is emitted from the lighting means (2) onto the work surface (8) that is to be illuminated.
  3. A luminaire according to claim 2,
    characterised in that
    the light-directing plate (4) has a prism structure (4) on its side that is remote from the lighting means (2).
  4. A luminaire according to claim 3,
    characterised in that
    the prism structure (4) is connected in one piece to the plate-shaped core of the light-directing plate (4).
  5. A luminaire according to one of the previous claims,
    characterised in that
    the luminaire has a rear plate (3) that is impervious to light on the rear side of the lighting means (2).
  6. A luminaire according to one of the previous claims,
    characterised in that
    the lighting means (2) is a layer of an inorganic semiconductor material.
  7. A luminaire according to one of claims 1 to 5,
    characterised in that
    the lighting means (2) is a foil made from an organic semiconductor material.
EP03004083A 2002-05-08 2003-02-25 Lamp for illuminating a workstation Expired - Lifetime EP1361391B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10220588 2002-05-08
DE10220588A DE10220588A1 (en) 2002-05-08 2002-05-08 Luminaire for workplace lighting

Publications (3)

Publication Number Publication Date
EP1361391A2 EP1361391A2 (en) 2003-11-12
EP1361391A3 EP1361391A3 (en) 2006-04-12
EP1361391B1 true EP1361391B1 (en) 2010-04-28

Family

ID=7714504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03004083A Expired - Lifetime EP1361391B1 (en) 2002-05-08 2003-02-25 Lamp for illuminating a workstation

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EP (1) EP1361391B1 (en)
AT (1) ATE466230T1 (en)
DE (2) DE10220588A1 (en)
NO (1) NO334160B1 (en)

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US9523487B1 (en) 2011-05-17 2016-12-20 Pixi Lighting, Inc. Flat panel lighting device and driving circuitry
US10215911B2 (en) 2013-04-17 2019-02-26 Unity Opto Technology Co., Ltd. Lighting assembly

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EP2363632A1 (en) * 2010-03-05 2011-09-07 Pöllet, Wilfried Device for lighting a work board
TWI416049B (en) * 2010-09-10 2013-11-21 Young Lighting Technology Corp Light source apparatus and method of using light source apparatus
DE102011079012A1 (en) * 2011-07-12 2013-01-17 Ledon Oled Lighting Gmbh & Co. Kg Light module with controllable light control
TWM422633U (en) * 2011-09-22 2012-02-11 Arex Twn Internat Co Ltd The luminaire with asymmetric luminous intensity
US9476552B2 (en) 2013-04-17 2016-10-25 Pixi Lighting, Inc. LED light fixture and assembly method therefor
US9546781B2 (en) 2013-04-17 2017-01-17 Ever Venture Solutions, Inc. Field-serviceable flat panel lighting device
WO2014193830A1 (en) * 2013-05-31 2014-12-04 3M Innovative Properties Company Luminaire for crosswalk
US9557022B2 (en) 2015-04-30 2017-01-31 Ever Venture Solutions, Inc. Non-round retrofit recessed LED lighting fixture

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AUPM483294A0 (en) * 1994-03-31 1994-04-28 Chulalongkorn University Amorphous semiconductor thin film light emitting diode
IT1280453B1 (en) 1995-07-28 1998-01-20 Carello Spa HEADLIGHT FOR REDUCED THICKNESS VEHICLES.
DE29621619U1 (en) * 1996-12-12 1997-02-27 Siemens Ag Device for illuminating theater stages, TV studios or the like.
DE19826548A1 (en) 1998-02-05 1999-08-12 Zumtobel Staff Gmbh Lighting arrangement
DE10042651C2 (en) * 2000-05-08 2002-10-02 Poellet Wilfried Workplace lighting
JP2001325805A (en) * 2000-05-15 2001-11-22 Matsushita Electric Works Ltd Stand-type lighting fixture
JP2001357978A (en) * 2000-06-16 2001-12-26 Kuraray Co Ltd Surface light source device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9523487B1 (en) 2011-05-17 2016-12-20 Pixi Lighting, Inc. Flat panel lighting device and driving circuitry
US9976732B2 (en) 2011-05-17 2018-05-22 Unity Opto Technology Co., Ltd. Flat panel lighting device and driving circuitry
US10215911B2 (en) 2013-04-17 2019-02-26 Unity Opto Technology Co., Ltd. Lighting assembly

Also Published As

Publication number Publication date
DE50312651D1 (en) 2010-06-10
NO334160B1 (en) 2013-12-23
EP1361391A2 (en) 2003-11-12
EP1361391A3 (en) 2006-04-12
NO20032047D0 (en) 2003-05-07
ATE466230T1 (en) 2010-05-15
DE10220588A1 (en) 2003-11-20
NO20032047L (en) 2003-11-10

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