EP2626621A2 - Lamp - Google Patents

Abstract

The lamp (1) has a receptacle (2) for a receiving a LED, and a reflector (3) for reflecting light emitted from the LED through a light emission window (4), in main radiation direction. The reflector is manufactured integrally from a single sheet (B). The segments (5) are formed in light emission window, and the gaps are formed between the segments and are bridged by a light conductor (9.1) partially.

Description

The invention relates to a luminaire for a workstation, the luminaire having a receptacle for at least one preferably point-like luminous means and a reflector for reflecting light emitted by the luminous means through a light emission window delimited by the reflector in a main emission direction.

For the illumination of workplaces, in particular of VDU workplaces, a necessary glare reduction of luminaires used there is particularly high, whereby here a spatial glare limitation of UGR19 and less can be prescribed. The DE 11 2006 002 976 T5 discloses a generic lamp for a workstation with a trough-like reflector, are arranged in the juxtaposed LEDs and causes a lateral glare of the emitted light. An improved glare has a in the DE 20 2009 014 103 U1 described luminaire with a channel-like reflector made of sheet metal, with additional additional transverse walls being provided here for improved illumination and for glare, which are used transversely into the reflector for the formation of individual reflector ores.

The object of the invention is a generic lamp in particular for a VDU workstation to provide, which has an effective glare for their use in a VDU workstation and which is easy to manufacture and assemble.

The stated object is achieved by the features of claim 1. Advantageous developments are described in the subclaims. The stated object is already achieved in that the reflector is segmented into the light exit window defining segments which are formed in an opening provided for the light exit window inner area of the sheet by at least approximately radially outwardly incisions and angled to form gaps between the sheet segments, and that the gaps are at least partially bridged by means of a first light guide.

By means of the incisions can thus tongue-like, in particular tapered segments are formed with a free end and connected to the sheet base side, which are angled to form the reflector at the end connected to the sheet of a sheet metal plane. Thus, the light exit window can be limited by the base sides of the segments connected to the sheet metal. With the angling from the sheet plane, depending on the geometry, facing edges of adjacent segments can be spaced apart to form gaps. Geometrically, by bending the segments, first gaps may be formed laterally between the segments. Further, due to a spacing of the free ends of the segments from each other, a second gap may arise, which, depending on the positioning of the incisions, may be arranged radially laterally to centrally. First gaps and second gap can be combined into a single gap.

The inventive measure can be generated in a simple manner and inexpensively a reflector. It will For segmentation only cuts introduced into the sheet and then angled segments from the sheet plane. The segments can remain connected to the metal sheet with a base side. The base pages can limit the light emission window. So they can, side by side, in pairs form an angle. From the geometry it follows that the sum of these angles is then 360 °. Geometrically caused, facing edges of adjacent segments with the bending or bending of the segments of the sheet plane scissor-like remove the formation of gaps.

By means of the design and alignment of the incisions or the segments, the reflector shape or its light reflection can advantageously be adapted to specific workplace conditions. Since the segments are angled to form the reflectors from the sheet plane, this can be achieved at the same time a lateral delimitation or aperture against a disturbing for a VDU workstation lateral radiation of the light. The degree of glare control can be set via segment shape, segment size and / or angle, in which the segments are angled away from the sheet plane. By means of this, the values for glare control can be optimized in such a way that the requirements for a VDU workstation with glare control of at least UGR19 or for other workstations with a different glare control can be met.

The reflector can be made for example of plastic, ceramic or magnesium die casting. It can have a reflection layer. Preferably, the reflector is made of a flat flat body made of metal in particular. The reflector can be made of a metal sheet. The sheet may be coated with a preferably flexible reflective layer. In an advantageous embodiment of the lamp, the reflector can be made in one piece be educated. This can be inexpensively made from a single sheet. The sheet can be cut to desired dimensions or be cut to length from a sheet metal strip. The light exit window can be arranged parallel to the sheet plane or in the sheet metal plane. It can be arranged perpendicular to the main emission direction of the light emitted by the light 1. Preferably, the individual segments are the same design and / or at least approximately the same, preferably angled towards the main radiation direction to the sheet plane. As a result, an axisymmetric reflector to the main emission can be formed. Geometrically conditioned, the second gap can then be arranged centrally in the middle, with the first gaps extending radially outward from this.

At least the first gaps laterally between the segments can be completely bridged by means of the first light guide. The bridging of the gaps by means of the first light guide allows additional illumination of the workplace and / or the environment of the workplace. It can be the size of the luminous surface of the reflector is increased by that of the first light guide. The first light guide can be designed such that it emits previously injected light and / or reflects incident light. Depending on the direction of the light emission and / or light reflection from or on the first light guide, a sharp focusing of the light by means of the reflector, for example, for sufficient illumination of the workplace can be mitigated by the light from the first light guide beyond the limits of the bundled light and reduces the contrast between the emitted light and the environment. This is generally perceived as pleasant and makes the eyes of a user less fatigued. On the other hand, in addition or alone, the opposite of the first Light emitted light into the bundled by the reflector light into it. Thus, by means of the gaps bridging the first light guide also requirements according to Light Guide 7 (LG7) can be met. In addition, the combination of a segmented reflector with the gaps of the segments at least partially bridging the first light guide offers the possibility of an aesthetic star-like design of the reflector with the first light guide.

The first light guide can be supported on the reflector. In this way, segments and first light guides can be fixed in position relative to one another. The optical waveguide can thus clip over at least the lateral first gaps and stabilize the segments to each other. This can be achieved at the same time a mechanically stronger construction of the lamp. The first optical waveguide can be fixed to the reflector in a positive and / or positive fit. It is preferred a plug and / or locking connection.

If the first optical waveguide has, for example, beam-like extensions for bridging the lateral gaps, then at least some of these extensions can laterally receive a receptacle for the lateral edges of the segments bounding the gaps and / or fastening means for positive and / or non-positive fixing of the first optical waveguide have the sheet metal. As a fastening means can be provided at the end a against main radiation extending extending male projection which engages to fix the first optical fiber under interference fit and / or latching in an associated provided on the sheet metal plug-in receptacle.

Preferably, the first light guide is formed substantially plate-like with narrow sides. The light guide can also be at least partially curved. He can adapt to the spatial orientation of the angled Segments correspondingly have angled portions, which may be the beam-like extensions. On the narrow sides, light which is fed into the first optical waveguide can emerge, so that they can light up brightly during operation of the luminaire. The first optical waveguide preferably overlaps the lateral first gaps in such a way that, at least in the main emission direction, it overlaps at least partially the edges of the segments delimiting the lateral gaps by a preferably small amount. Thus, the lateral edges can protrude with the narrow sides of the light guide in a reflection space bounded by the reflector. Thus, the light exiting at the narrow sides of the light can be emitted via the light exit opening of the lamp.

In a preferred embodiment of the luminaire, the segments may each have a free end and a base side on which they are respectively connected to the sheet and angled on the sheet. The base sides of the segments can thus limit the light emission window.

Favorable from the production, the light emission window may have a polygonal outline with preferably straight sides. At least three segments can be provided. These may be formed without bending. Your base pages can be designed as a straight line and form the polygonal outline of the light exit window accordingly. In this case, the first optical waveguide can have a shape corresponding to the number of segments of a star with at least three radiation-like extensions bridging the lateral gaps of the reflector. Preferably, four segments are provided. This facilitates the production of a rectangular plate or sheet metal strip. The higher the number of segments, the more directed the focus of the reflected light can be.

Advantageously, the radiation-like extensions of the first Light guide each having a curved cross-sectional shape with a pointing in the main radiation direction of curvature radius. In this way, the light introduced by the light guides can be focused into the light reflected by the reflector, for example to the workplace. The size of the radius of curvature can be used to determine the focus of the light. The focusing of the light can be done in accordance with the shape of the beam-like extensions to form a line-like or narrow-surface area in focus.

The recording of the lamp may have a receiving space for the preferably point-like bulb. The receptacle can preferably be arranged in the main emission direction in front of the reflector. In this case, the receiving space can be arranged completely in front of the reflector or at least partially projecting into the reflector space bounding the reflector space. The lighting means may be an LED, preferably a powerful LED, such as a so-called power LED.

To bridge the second gap, the first optical waveguide can have a central light passage area arranged perpendicular to the main emission direction for the light emitted by the illuminant toward the light exit window. In this case, the light passage area may be formed at least partially, in particular at the edge towards the first gaps, or preferably completely as a transparent and / or semi-transparent wall, such as a milky wall, and / or in the form of an opening. By means of the transparent, in particular by means of the semitransparent wall, the light passing through the light exit surface and thus through this wall can be easily scattered, so that a possible glare effect of the light is correspondingly reduced. Furthermore, the wall can serve as protection for the lamp. Whether and how much of the light striking the first light guide in the first Among other things, the light guide can be coupled in or reflected from the same depends, inter alia, on an angle of incidence between incident light and a surface normal of the wall. Preferably, the first optical fiber is constructed so that it protrudes for coupling and radiation of light on narrow sides with such narrow sides in the reflector space. It can also have narrow sides against the main radiation direction and this protrude beyond the lamp. Thus, for example, a rear ceiling can be easily illuminated, which further reduces the glare of the lamp.

If the light passage area is at least partially formed as an opening, then this can be limited by narrow sides of the first light guide. By these narrow sides radiated light from the light source can be coupled into the first light guide.

In a further preferred embodiment of the luminaire, the first optical waveguide is formed in one piece. Thus, the first optical fiber can be inexpensively manufactured as an injection molded part.

Preferably, reflector and / or first light guide are formed axially symmetrical to a center line, which extends in the main emission direction.

In a preferred embodiment, the luminaire may have at least two light exit windows which are each introduced into a common metal sheet while forming a reflector assigned to them. Thus, the two reflectors, spaced from each other in the sheet metal or adjacent to each other, be machined in one piece from the sheet. The light exit openings can be arranged spaced from each other in the sheet. Preferably, the light exit openings are arranged in the sheet plane in alignment with each other. The lamp can advantageously some row or a plurality of individual light exit openings, each having associated reflectors, which are introduced into a common plate. Thus, the sheet with the incorporated reflectors form a one-piece component. Preferably, the light exit openings, preferably aligned with respect to the sheet plane, arranged in rows in one or more rows and / or arranged like a checkerboard pattern in the sheet. The light exit openings can be arranged individually and / or arranged in groups in the sheet metal.

Thus, an almost arbitrary number of light exit openings and the associated reflectors can be introduced into the common sheet, so that the respective lamp can be designed on the number and distribution to a specific workplace. It is understood that different reflectors, for example, with different segmentations and / or sizes of the segments can be introduced into a sheet. In this case, the reflectors can also be formed asymmetrically to the central axis of the light exit opening. Furthermore, more than one light source can be associated with a reflector. Thus, the luminaire can be specified for a specific workstation.

In a further advantageous embodiment of the luminaire, a second light guide can be provided on the outside of the luminaire. The second light guide can be arranged at least partially around the outside of the luminaire and / or at least approximately parallel to the light exit window. The second optical waveguide may, for example, be arranged on the outside of the light exit window adjacent to the same or at the same delimiting or spaced from it. By means of the coupled into the second light guide light, the environment of the lamp, in particular that of the light exit window, be brightened. This can be an eyes veründerender contrast between illuminated area and adjacent unlighted environment to the illuminated area mitigated.

The optical waveguide can be designed and / or arranged such that in operation, light from at least one provided point-like illuminant can be coupled into it. The optical waveguide can be coupled to the first optical waveguide in a light-optical manner. Thus, light from the first light guide into the second light guide and / or light from the second light guide can be coupled into the first light guide.

If a luminaire has a plurality of light exit openings, then the second light guide can at least partially or partially surround outside at least some of the light exit openings and / or frame the entire luminaire externally at least partially or in sections.

As a material for the first and / or second optical fiber light guide materials, such as polymethylmethacrylate (PMMA) or polyacrylate (PA), into consideration.

The luminaire may have a housing which is delimited at least partially by the metal sheet in the main emission direction. The receptacle for the lighting means can be arranged on a circuit board, which, in particular in the case of an LED as lighting means, can be a customary standardized circuit board. This board can be fixed to the housing. The board can be arranged structurally separate from the sheet in the lamp. Thus, the sheet, provided with one or more light exit openings and thereby equipped with the associated reflectors, be pre-assembled. The pre-assembly may also include the first light guide.

Fig. 1

eine Draufsicht auf eine erste Ausführungsform einer Leuchte mit Reflektor und erstem Lichtleiter,

Fig. 2

eine erste Querschnittsansicht gemäß dem Schnittverlauf II-II in Figur 1,

Fig. 3

eine zweite Querschnittsansicht gemäß dem Schnittverlauf III-III in Figur 1,

Fig. 4a

eine perspektivische Draufsicht auf Reflektor und erstem Lichtleiter,

Fig. 4b

eine perspektivische Draufsicht auf den Reflektor

Fig. 5

eine Unteransicht des ersten Lichtleiters,

Fig. 5a

einen Ausschnitt A gemäß Figur 5,

Fig. 5b

eine Querschnittsansicht des ersten Lichtleiters gemäß dem Schnittverlauf Vb-Vb in Figur 6

Fig. 6

eine Querschnittsansicht des ersten Lichtleiters gemäß dem Schnittverlauf VI-VI in Figur 5,

Fig. 6a

einen Ausschnitt B gemäß Figur 6,

Fig. 7

eine Seitenansicht einer zweiten Ausführungsform der Leuchte mit Rückwand, Aufnahme und Leuchtmittel,

Fig. 8

eine Unteransicht auf die zweite Ausführungsform der Leuchte gemäß Figur 7,

Fig. 9

eine erste Querschnittsansicht gemäß dem Schnittverlauf IX-IX in Figur 8,

Fig. 10

einen Ausschnitt mit einer perspektivischen Unteransicht der zweiten Ausführungsform der Leuchte gemäß Figur 7 und

Fig. 11

einen Ausschnitt mit einer perspektivischen Draufsicht auf die zweite Ausführungsform der Leuchte ohne Rückwand, Aufnahme und Leuchtmittel.

The present invention will be described in more detail below with reference to an embodiment of the luminaire shown in a drawing explained. In the drawing show:

Fig. 1

a top view of a first embodiment of a lamp with reflector and the first light guide,

Fig. 2

a first cross-sectional view according to the section line II-II in FIG. 1 .

Fig. 3

a second cross-sectional view according to the section line III-III in FIG. 1 .

Fig. 4a

a perspective top view of the reflector and the first light guide,

Fig. 4b

a perspective top view of the reflector

Fig. 5

a bottom view of the first light guide,

Fig. 5a

a section A according to FIG. 5 .

Fig. 5b

a cross-sectional view of the first light guide according to the sectional profile Vb-Vb in FIG. 6

Fig. 6

a cross-sectional view of the first light guide according to the section line VI-VI in FIG. 5 .

Fig. 6a

a section B according to FIG. 6 .

Fig. 7

a side view of a second embodiment of the lamp with rear wall, recording and lighting,

Fig. 8

a bottom view of the second embodiment of the luminaire according to FIG. 7 .

Fig. 9

a first cross-sectional view according to the section line IX-IX in FIG. 8 .

Fig. 10

a detail with a perspective bottom view of the second embodiment of the lamp according to FIG. 7 and

Fig. 11

a detail with a perspective Top view of the second embodiment of the lamp without rear wall, recording and lighting.

In the FIGS. 1 to 11 In two different views and partial views, two embodiments of a luminaire 1 for a screen workstation not shown here are shown, with some figures representing individual components of the luminaire 1 separately. The luminaire 1 has a receptacle 2 for an LED as a luminous means and a reflector 3 for reflecting the light emitted by the point-like luminous means through a light emission window 4 delimited by the reflector 3 in a main emission direction h. The light exit window 4 is perpendicular to the main emission direction h, in which the light is predominantly emitted by the luminous means from the luminaire 1.

The reflector 3 is made in one piece from a sheet B: The reflector 3 is made up of segments 5 of the sheet B delimiting by means of the light exit window 4. The segments S are formed in a provided for the light exit window 4 inner region I of the sheet B by means radially outwardly incisions introduced and angled to form gaps 6.1, 6.2 between the segments 5 at an angle ß to the sheet B or to a sheet plane E. The segments 5 are the same size here. There are four triangular segments 5 are provided here. They each have the shape of an approximately equilateral triangle with a pointed free end 7 and the light exit window 4 limiting base 8. As a result of geometry, edges of adjacent segments 5 facing each other away from the plane of the sheet move away like scissors.

How clearly the detail representation of the reflector 3 with the angled segments 5 in FIG. 4b can be removed, are geometric reasons, between the angled segments 5 lateral first gaps 6.1 and, between the spaced free ends 7, a central second gap 6.2, arranged, wherein the gaps 6.1, 6.2 merge directly into each other. They form a gap together. For better readability of the drawing, a fictitious delimitation of the gaps 6.1, 6.2 is indicated by a dotted line, which thus does not represent a body edge.

The lamp 1 has a first light guide 9.1, which in the FIGS. 5 and 6 is shown. The first light guide 9.1 is made as an injection molded component in one piece from a fiber optic plastic. It has a star-like shape with, according to the number of segments 5, four radiating extensions 10, with which it completely bridges the lateral first gaps 6.1. On the inside, a central light passage surface 11 is provided, which is determined here by an outer ring 12 and a central, central opening 13. The four beam-like extensions 10 run together to form this ring 12 radially inward. Thus, the second gap 6.2 is bridged only at the edge and not in the middle. The ring 12 has in the main emission direction h forward annular narrow sides 14 ( FIGS. 4 . 6 . 11 ), in the operation of the lamp 1 light is coupled from the lamp and passed into the extensions 10 into it, the extensions 10 light up so bright. Thus, the luminous surface of the reflector 3 is increased by that of the first light guide 9.1. Furthermore, the ring 12 in the main emission direction h at the rear comprises an annular narrow side 14, via which light coupled into the first light guide 9.1 is emitted to the light exit window 4, whereby the ring 12 enlarges the amount of light radiated towards the workstation and serves as a decorative luminous design element.

Reflector 3 and first light guide 9.1 are each formed axially symmetrical to a central axis m parallel to the main emission h.

In FIG. 6a is a cross section through one of the extensions 10 is shown. Clearly visible is a symmetrical curvature of the extension 10, whose radius of curvature h points in the main emission direction h to the light exit window 4. Thus, the radiated from the extensions 10 light can be focused through the light exit window 4 through and thus enhance the lighting of the workplace. Depending on the geometry, the extensions 10 each have an essentially isosceles triangular shape with a free end 15.

As in particular in FIGS. 4 . 10 and 11 can be seen, the first optical fiber 9.1 overlaps the segments 5 of the reflector 3 in the main radiation direction h at the edge edge. For this purpose, the lateral edges of the extensions 10 are stepped for receiving the marginal side of the segments 5, so here segments 5 of the reflector 3 and extensions 10 of the first light guide 9.1 interlock and are stabilized to each other. In addition, a plug-in connection with a press fit between the sheet B and the first light guide 9 is provided by the end of the free end 14 of the extensions 10 each have a male projection 16 is provided to form the connector against Hauptabstrahlrichtung h in an associated socket 17 on the sheet B edge of the light exit opening 4 engages. For this purpose, the plug-in projection 16 is tapered conically towards the main emission direction h. Thus, the first light guide can be securely held 9.1 fixed to the sheet B position. For flat contact with the sheet B, the free ends 14 of the extensions 10 are formed corresponding to the sheet plane E angled.

The receptacle 2 is formed here for a LED, not shown here, and arranged on a circuit board 18. The board 18 itself is fixed to a housing 20 which, except for marginal areas, in the main radiation direction h is open and is covered by the sheet B.

The board 18 with the receptacle 2 is arranged in the main emission direction h in front of the reflector 3 and the first light guide 9.1 and spaced therefrom. Based on the example in FIGS. 2 and 3 shown spacing of the board 18 to the reflector 3 and the first light guide 9.1 clearly, is that arranged in the receptacle 2 LED and in a receiving space 19 for the LED in front of the reflector 3 and the first light guide 9.1 are arranged.

In its first embodiment, the luminaire 1 has a second optical waveguide 9.2, which is arranged on the outside of the housing 20 and runs parallel to the light-penetrating window 11 in full circumference around the housing 20. The second light guide 9.2 is for clarity of illustration of the other components of the lamp 1, for example, only in FIG. 1 played. The second light guide 9.2 is what is in FIG. 1 is not explicitly shown, optically coupled to the first light guide 9.1.

The luminaire 1 has in its second embodiment according to the FIGS. 7 to 11 several, here six reflectors 3, each cut from a single common sheet B by segmenting the respectively provided inner region I and bending the here four segments 5, each with associated other components, such as the first light guide 9.1, recording 2 and LED on. Thus, the second embodiment consists practically of individual lamp elements, which are constructed similar to the first embodiment of the lamp 1, wherein the reflectors 3 are made from the common sheet B. The sheet B closes off the housing 20 in the main emission direction h. The limited by the respective reflectors 3 light exit window 4, each spaced with respect to the sheet plane E and aligned with each other, arranged in two parallel rows of three light emission window 4 in the sheet B.

Based on the second embodiment of the lamp 1 is to be made clear that, ultimately, depending on the dimensions, also a plurality of light exit openings can be introduced into the sheet, wherein the number of their number, modification and / or distribution of the respective light to a specific workplace can be designed. Therefore, the invention is not limited to the embodiments shown here.

LIST OF REFERENCE NUMBERS

1

lamp

2

admission

3

reflector

4

Light emission window

5

segment

6.1

first gap

6.2

second gap

7

The End

8th

base side

9.1

first light guide

9.2

second light guide

10

extension

11

Light-transmitting surface

12

ring

13

narrow side

14

The End

16

plug projection

17

plug-in receptacle

18

circuit board

19

accommodation space

20

casing

B

sheet

I

interior

e

sheet plane

H

main radiation

m

central axis

Claims (12)

Luminaire (1) for in particular a VDU workstation, the luminaire (1) having a receptacle (2) for at least one preferably point-like luminous means and a reflector (3) for reflecting light emitted by the luminous means through a light exit window bounded by the reflector (3) (4) in a main emission direction (h), characterized in that the reflector (3) is segmented into the light exit window (4) delimiting segments (5) which are provided in an interior region (I) of the light exit window (4) Sheet (B) formed by at least approximately radially outwardly incisions and angled with formation of gaps (6.1, 6.2) between the segments (5), and that the gaps (6.1, 6.2) by means of a first light guide (9.1) at least partially are bridged. Luminaire according to claim 1, characterized in that the reflector (3) is integrally formed. Luminaire according to claim 1 or 2, characterized in that the reflector (3) is made of a sheet metal. Luminaire (1) according to one of claims 1 to 3, characterized in that the segments (5) each have a free end (7) and a base side (8), on which they are angled on the sheet (B), wherein the Base sides (8) of the segments (5) limit the light exit window (4). Luminaire (1) according to one of claims 1 to 4, characterized in that the light exit window (4) has a polygonal profile and the first light guide (9.1) has a star shape with a number of segments (5) corresponding number of radiation-like extensions (10 ) having. Luminaire (1) according to claim 5, characterized in that the beam-like extensions (10) of the first light guide (9.1) each have a curved cross-sectional shape with a main radiation direction (h) pointing radius of curvature. Luminaire (1) according to one of claims 1 to 6, characterized in that the first light guide (9.1) in the main radiation (h) forward a preferably central light passage surface (11) for the light emitted by the light source to the light exit window (4) out , wherein the light passage surface (11) is at least partially formed as a transparent or semitransparent wall and / or as an opening (14). Luminaire (1) according to one of claims 1 to 7, characterized in that the receptacle (2) has a receiving space (18) for a preferably point-like Illuminant, wherein the receiving space (18) in Hauptabstrahlrichtung (h) spaced from the first light guide (9.1) and / or reflector (3), up to the first light guide (9.1) and / or reflector (3) protrudes or at least partially protrudes into the first light guide (9.1) and / or the reflector (3). Luminaire (1) according to one of claims 1 to 8, characterized in that the first light guide (9.1), the segments (5) of the reflector (3) in the main direction of radiation (h) at the rear edge overlaps and against Hauptabstrahlrichtung (h) at the segments (5) and / or edge of the light exit window (4) is supported. Luminaire (1) according to one of claims 1 to 9, characterized in that the first light guide (9.1) is integrally formed. Luminaire (1) according to one of claims 1 to 10, characterized in that s a second light guide (9.2) for illuminating an environment of the lamp (1) is provided which is optically coupled to the first light guide (9.1). Luminaire (1) according to one of claims 1 to 11, characterized in that at least two light exit windows (4) are provided, which are each incorporated with the formation of their associated reflector (3) in the one sheet (B).

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