WO2014064139A1

WO2014064139A1 - Light emission element for a luminaire, and luminaire comprising a light emission element

Info

Publication number: WO2014064139A1
Application number: PCT/EP2013/072140
Authority: WO
Inventors: Georg Hobelsberger
Original assignee: Zumtobel Lighting Gmbh
Priority date: 2012-10-25
Filing date: 2013-10-23
Publication date: 2014-05-01
Also published as: EP2912651A1; DE202012104101U1; EP2912651B1

Abstract

A plate-like light emission element (1) for a luminaire (2) has a first partial region (3) and a second partial region (4), wherein the first partial region (3) is arranged downstream of the second partial region (4), wherein the first partial region (3) is configured to form a light emission surface (5) of the luminaire (2) and the second partial region (4) is configured not to form an outer surface region of the luminaire (2), wherein the first partial region (3) consists of an optically clear material and wherein the second partial region (4) directly adjoins the first partial region (3) with a portion (41) consisting of an optically diffuse material. At least one cutout (7) for mounting the light emission element (1) is formed on an outer periphery of the second partial region (4) and extends as far as toward the light emission surface (5).

Description

Light-emitting element for a light, as well as light with a

Light-emitting element

The invention relates to a plate-like light-emitting element for a lamp and a lamp with such a light-emitting element.

A luminaire with a light-emitting element is known from DE 10 2010 063 272 AI. This lamp has a trough-shaped luminaire housing, through which a light-emitting opening is formed, which is covered by the light-emitting element. The light-emitting element has a planar light-emitting surface, by which a surface normal is determined. For attachment to the luminaire housing, the light-emitting element has a latching element which - in a projection along the

Considered surface normal - is disposed completely within the circumscribed by the light emitting surface area. As a result, the light-emitting element can be supported on the luminaire housing without the need for a frame element. The inner surface of the light-emitting element facing towards the interior of the luminaire is provided with a structure for scattering or equalizing the light. Narrow side surfaces of the light-emitting element, which are also visible from the outside when viewing the luminaire and which are aligned with the adjoining ones, adjoin the light-emitting surface, separated from the latter by edge-side edges

Outside surfaces of the lamp housing are formed.

In the interior of the lamp housing, a reflector element is arranged, which extends in a funnel shape towards the edge region of the light emitting element. As a result, it is achieved that the light emission surface appears well illuminated up to its edges. However, the light output is over the narrow side surfaces of the

Light emitting element significantly inhomogeneous than the light output via the

Light output surface.

The invention has for its object to provide an improved light-emitting element, in particular a light-emitting element, which also has corresponding Side surface areas allows a more homogeneous appearing light output. In addition, a luminaire is to be specified with a corresponding light-emitting element.

This object is achieved according to the invention with the objects specified in the independent claims. Particular embodiments of the invention are indicated in the dependent claims.

According to the invention, a plate-like light-emitting element for a luminaire is provided, which has a first partial area and a second partial area, wherein - viewed in an intended light emission direction - the first partial area is arranged following the second partial area, wherein the first partial area is designed to be a light-emitting area to form the lamp and the second

Part of the area is designed to form no outer surface region of the lamp and wherein the first portion of an optically clear material and the second portion with a, consisting of an optically diffuse material portion directly adjacent to the first portion. The light-emitting element is designed such that at least one recess for holding the light-emitting element is formed on an outer circumference of the second portion, which extends up to the light-emitting surface.

Due to the fact that the recess extends as far as the light emission surface, it can be advantageously achieved that a luminaire housing of the luminaire extends up to the light emission surface

Lichtabgabefläche out and thereby the light emitting surface especially

is evenly lit. In addition, this design makes it possible for an outer wall surface region of the luminaire housing to extend in alignment with the light emission surface.

Preferably, the design is such that the at least one recess and the light emitting surface form an edge which encloses an angle which is between 100 ° and 170 °, preferably between 120 ° and 150 °, can on the one hand a particularly good illumination of the light emitting surface achieve to the limit to the outer wall surface area and on the other hand, a secure mounting of the light emitting element to the lamp housing. Manufacturing technology advantageous is the at least one recess made by a milling,

in particular by a milling which is wedge-shaped or triangular in cross-section. Preferably, the first portion of the light emitting element is cuboid shaped. As a result, a particularly advantageous external appearance of the lamp can be achieved. The light-emitting element preferably consists of PMMA

(Polymethyl methacrylate) or acrylic. Preferably, it is formed from a multilayered, in particular produced by a casting process, composite panel material.

A particularly advantageous appearance of the light emitting element or the lamp can be achieved if the Lichtabgabefiäche is polished. A particularly even light emission is possible when the

Light emitting element is designed such that between the first portion and the portion of the second portion of an interface is formed, which extends in a plane. According to a further aspect of the invention, a luminaire is provided, which has a light-emitting element according to the invention, and a luminaire housing, on which the light-emitting element is held. In this case, the lamp is designed such that the lamp housing extends to the light emitting surface. Preferably, the Lichtabgabefiäche is designed to extend in a further plane, wherein the lamp housing has an outer Wandfiächenbereich, which extends to the Lichtabgabefiäche down and which is also designed extending in the other plane. This makes it possible to achieve a particularly high-quality appearance of the lamp.

A particularly secure or reliable mounting of the light-emitting element to the luminaire housing is made possible if the luminaire housing has at least one holding element which is suitable for holding the light-emitting element to the luminaire Luminaire housing is arranged engaging in the at least one recess of the light emitting element.

Furthermore, preferably, the lamp also has a light source for emitting a light, wherein the lamp is designed such that the emitted light from the light source radiates into the second portion of the light emitting element and leaves the luminaire in the further sequence over the first portion of the light emitting element. In this case, a particularly homogeneous backlight of the

Light emitting element effect, if the lamp also has a Refiektorelement with two Refiektorfiächen that are formed and arranged in the lamp housing that they extend to the light emitting element to extend diverging. Preferably, the two reflector surfaces are designed white, especially painted white. The invention is explained in more detail below with reference to an embodiment and with reference to the drawings. Show it:

Fig. 1 is a sketch of a perspective section of an inventive

Luminaire with a light-emitting element according to the invention,

Fig. 2 is a cross-sectional sketch through the lamp housing and the

Light-emitting element,

3 is a sketch of the detail "A" of Fig. 2,

4 shows a cross-sectional sketch through the separated light-emitting element,

Fig. 5 shows a corresponding longitudinal section, a corresponding supervision and 7 shows a further cross-sectional sketch through the luminaire housing and the light-emitting element, with light source and reflector element.

FIG. 1 shows a perspective sketch of a luminaire 2 according to the invention with a light-emitting element 1 according to the invention. The luminaire 2 has a luminaire housing 10 which, in the example shown, is made oblong, so that it extends along a longitudinal axis L. In Fig. 1, only a portion of the lamp housing 10 along the longitudinal axis L is sketched. The luminaire housing 10 may be formed in a profile shape, so that it is in a

Cross-section normal to the longitudinal axis L has a U-shape and thus a first U-leg 101 and a second U-leg 102 are formed. In the area between the free ends of the two U-legs 101, 102 is then preferably formed by the lamp housing 10, a light emitting area 19 of the lamp 10. Alternatively, the lamp housing, for example, be trough-shaped, in particular cuboid, so that through the edge of the tub a corresponding

Light emitting area 19, in particular in the form of a light emitting opening is formed.

For example, the lamp housing 10 may be made of aluminum. The

Luminaire housing 10 may be designed in particular as an extruded profile.

The light-emitting element 1 is designed as a whole plate-like or plate-shaped and held on the lamp housing 10 that it is in the light emitting area 19, or that it covers the light emitting opening. In the example shown extends in a cross section normal to the longitudinal axis L considered the

Light emitting element 1 accordingly between the two free ends of the two U-legs 101, 102. The light-emitting element 1 is accordingly preferably also elongated and shaped profiled, which - as the lamp housing 10 - parallel to the longitudinal axis L extends.

As sketched by way of example in FIG. 7 in a cross section normal to the longitudinal axis L, a light source 15, for example an LED light source, for emitting a light is arranged in the luminaire housing 10, the luminaire 2 being such is designed such that the light of the light source 15 on a first side in the

Light emission element 1 enters and leaves in the course on another side, the light emitting element 2 and thus also the light. Also, the light source 15 is preferably elongated so that it extends parallel to the longitudinal axis L. For example, the light source 15 may comprise LEDs arranged along a straight line parallel to the longitudinal axis L, for example on at least one LED board. Alternatively, however, at least one fluorescent tube can be provided as the light source, for example. In the present description, it is assumed that the lamp 2 with

With respect to the vertical oriented so that the light-emitting element 1 faces downward, as indicated in Fig. 7 by an arrow u. However, this is purely exemplary, the lamp 2 may also be provided for a different orientation with respect to the vertical. The directions etc. are to be reinterpreted accordingly in such a case.

Accordingly, a light output of the lamp 2 is provided in the lower half space, in particular by a provided Lichtabstrahlrichtung R of the lamp 2 and the light emitting element 1 around, which points vertically downwards, ie also in the direction of the arrow u.

The light emission direction R is thus in the example shown with reference to the

Plate shape of the light-emitting element 1 normally directed. In Fig. 2 is a further cross section through the light 2 normal to the longitudinal axis L sketched - here without the light source 15 - and in Fig. 4, the separated

Light-emitting element 1. The light-emitting element 1 has a first partial region 3 and a second partial region 4, wherein - viewed in the intended light emission direction R - the first partial region 3 is arranged below the second partial region 4. It is thus provided that the light emitted by the light source 15 of the luminaire 2 enters via the second subregion 4 into the light emission element 1 and

The latter leaves again via the first subarea 3. As can be seen from Fig. 2, the first portion 3 is formed to a

Light emitting surface 5 of the lamp to form.

In the example shown, the first portion 3 of the light-emitting element 1

designed cuboid, with the main axis of the cuboid extends parallel to the longitudinal axis L in the intended orientation. Accordingly, the light-emitting element 1 has a width b transverse to the longitudinal axis L, and a vertical extent or height h. The width b may for example be between 5 and 20 cm, the height h, for example, be between 1 and 4 cm. The extent of the luminaire 2 along the longitudinal axis L may be for example between 50 cm and 10 m. The light emitting element 1 can be as long as the light 2 or shorter.

Said light emitting surface 5 of the light emitting element 1 is formed in the example shown by a side surface of the cuboid, so that they have a "lateral"

Lichtabgabefläche 5 forms. By referring to the cuboid shape of this

Side surface opposite another side surface is accordingly formed a further lateral light emitting surface 51 and by the down u facing

Base surface of the cuboid, a downwardly facing or lower light emitting surface 52nd

Preferably, the light emitting element 1 as well as the lamp housing 10 with respect to a - here vertical - symmetry plane S symmetrically formed or shaped. As a result, a particularly even-looking appearance of the luminaire 2 is possible.

As can be seen from FIG. 2, the second subarea 4 of the light-emitting element 1 is configured to form no outer surface region of the luminaire 2. In the example shown, it is provided that the second portion 4 is completely within the two U-legs 101, 102 when the light-emitting element 1 is mounted as intended on the lamp housing 10.

As shown by way of example in FIG. 4, the light-emitting element 1 is preferably configured in such a way that between the first sub-area 3 and the second sub-area 4 a Boundary surface 6 is formed, which runs in a plane E. In particular, the

Design such that the interface 6 between the first portion 3 and the second portion 4 extends completely in this plane E. Accordingly, the first subarea 3 extends from below to the plane E and the second subarea 4 from above. The first portion 3 does not protrude above the plane E upwards and the second portion 4 does not protrude below the plane E down. Of course, this is always to be understood as technically feasible.

The first portion 3 is made of an optically clear material. For example, the first portion 3 made of PMMA or acrylic. The Lichtabgabefiäche 5 is preferably polished. Similarly, the further lateral light emitting surface 51 and / or the lower light emitting surface 52 are preferably polished.

The second portion 4 has a portion 41 which consists of an optically diffuse material and which is directly adjacent to the first portion 3. In the example shown, the portion 41 is formed by a lower layer of the second portion 4, wherein an upper layer 42 of the second portion 4 may consist of either a diffuse or a clear material. The proportion 41 of the second subarea 4 can accordingly also form 100% of the second subarea 4 or the entire second subarea 4.

Preferably, the second portion 4 is formed of PMMA or acrylic.

A particularly uniform illumination of the first portion 3 is made possible when the boundary surface 6 between the first portion 3 and the diffuse portion 41 of the second portion 4 is formed extending in the plane E, in particular completely or exclusively in the plane E is formed extending.

In the example shown, the design is such that the lower layer of the second portion 4, that is, the portion 41, extends upwardly to a second plane E2, which extends above the first-mentioned plane E and parallel to the latter. As a result of the above-mentioned embodiment, the light emitted by the light source 15 in the plane E quasi generates a homogeneously luminous surface, through which the light from the second subregion 4 enters the first subregion 3.

In addition, the design is preferably such that the interface 6 extends to the Lichtabgabefiäche 5 out. On the other hand, in the example shown, the boundary surface 6 also extends to the further lateral Lichtabgabefiäche 51. This causes the light of the light source 15 - after passing through the second portion 4 - almost over the top of the cuboid, by the first portion. 3 is fixed, homogeneously enters the first portion 3. As a result, when viewing the luminaire from the outside, the light emission surface 5 appears to be particularly homogeneous or the light emission surfaces 5, 51, 52 appear to be particularly homogeneous. It can be practically avoided in this way that edges or similar structures map, by which the appearance would be inhomogeneous and thus impaired. Thus, in particular, an appearance of the lamp can be achieved, which has a particularly high quality. The light-emitting element 1 can be made of one piece. Alternatively, it may be made of at least two pieces. For example, the first portion 3 and the second portion 4 may each be integrally formed, these two pieces are connected to form the light-emitting element 1 by gluing together, wherein the boundary surface 6 is formed by the bonding. Alternatively, however, another appropriate division into pieces may be provided, for example a division into two pieces along the second plane E2.

For holding the light emitting element 1 to the lamp housing 10, at least one recess 7 is formed on an outer periphery of the second portion 4 of the light emitting element 1, which extends to the Lichtabgabefiäche 5 out. This is sketched enlarged in Fig. 3, which shows the detail "A" of Fig. 2. In Fig. 5 a sketch is shown in addition to a longitudinal section of the light emitting element 1 and a corresponding plan view in Fig. 6. Preferably the recess 7 is shaped profiled so that it extends over the entire length of the light emitting element 1 out. The recess 7 can furthermore be formed circumferentially around the light-emitting element 1 or the second sub-area 4, as is apparent from FIG. 6.

As shown by way of example in FIG. 3, a corresponding engagement or holding element 11 is preferably formed on the luminaire housing 10 - in the example shown on the free end region of the first U-leg 101. The holding element 11 is preferably designed in such a way that it With respect to the lamp housing 10 protrudes inward. The retaining element 11 may be a latching lug.

If, as in the example shown, the recess 7 extends as far as the light emission surface 5 or as far as the plane E, then the luminaire housing 10 can be designed in a particularly suitable manner such that an outer wall surface region 17 of the luminaire housing 10, here of the first U-leg 101, extending to the light emitting surface 5 back. In particular, the outer wall surface region 17 and the light emission surface 5 can be aligned in this way or in a common, further plane V. In the example shown, both the light-emitting surface 5 and the outer wall surface region 17 are oriented vertically, so that the further plane Kum is a vertical plane. By such a design, the external appearance of the lamp 2 can continue to influence positively.

In the example shown, the outer wall surface region 17 extends over the entire height of the first U-leg 101. The same applies to the second U-leg 102 and the other lateral light emitting surfaces 51. This sets the first

Subarea 3 of the light emitting element 1 downwards virtually without rejuvenation or extension of the light housing 10 in its shape. Preferably, the recess 7 with the light emitting surface 5 forms an edge which encloses an angle a which is between 100 ° and 170 °, preferably between 120 ° and 150 °; in the example shown, the angle α is particularly preferably 135 °. This makes it possible that light from the interior of the lamp housing 10th reaches the boundary line between the outer wall surface portion 17 and the light emitting surface 5 to an appropriate extent and thus the

Light emitting surface 5 is evenly lit. A particularly suitable shape of the recess 7 is made possible when the

Recess has an inclined surface 71, directly to the

Lichtabgabefläche 5 and thus forms together with the light emitting surface 5, said edge, and a horizontal support surface 72, which is formed parallel to the plane E. In particular, the recess 7 may be formed by the inclined surface 71 and the support surface 72. As a result of the embodiment described, the diffuse component 41 of the second subregion 4 extends exactly as far as the lower edge of the recess 7.

In this case, the recess 7 is viewed in cross-section wedge-shaped or

triangular. In particular, if the inclined surface 71 is plan shaped, can be particularly suitable to achieve that no unwanted reflections or reflections of light rays occur that would adversely affect the light output of the lamp. Light of the light source 15 can thus well without shading to the

Top edge of the first portion 3 reach.

By the support surface 72 is a particularly suitable holder of

Light emitting element 1 on the lamp housing 10 allows.

Vorzugswiese the recess 7 is formed by a milling. By the

Recess 7 is thus formed an undercut. Above the bearing surface 72, the light-emitting element 1 or the second sub-area 4 is not as wide as the first sub-area 3. The distance between the second sub-area 4 above the bearing surface 72 and the further level V is at least one dimension d, that of a wall thickness of the first U-leg 101 corresponds.

The entire light-emitting element 1 is preferably formed from a multilayer composite panel material. The first portion 3 may be formed from a first, optically clear layer of this plate material and the portion 41 of second portion 4 may be formed of a second, optically diffuse layer of this plate material. In particular, a production by means of a casting process is suitable. As sketched by way of example in FIG. 7, the luminaire furthermore preferably has a reflector element with two reflector surfaces 13, 14, by means of which the light from the light source 15 is directed in a particularly suitable manner to the light emission element 1. For this purpose, the reflector surfaces 13, 14 are preferably designed in such a way that they extend in a diverging manner towards the light-emitting element 1. Preferably, the

Reflector surfaces 13, 14 designed white, especially painted white. The

Reflector element is preferably arranged in the luminaire housing 10.

Claims

Expectations

Plate-like light emitting element (1) for a lamp (2), having a first partial area (3) and a second partial area (4),

where, viewed in an intended light emission direction (R), the first

Sub-area (3) is arranged following the second sub-area (4), wherein the first sub-area (3) is designed to form a light-emitting surface (5) of the lamp (2) and the second sub-area (4) is designed to not have an outer surface area the lamp

(2) to form,

wherein the first portion (3) consists of an optically clear material and the second portion (4) has a portion (41) made of an optically diffuse material directly adjacent to the first portion

(3) adjacent, characterized in that

that on an outer circumference of the second portion

(4) at least one recess (7) is formed for holding the light-emitting element (1), which extends up to the light-emitting surface (5).

Light emission element (1) according to claim 1,

which is designed in such a way that the at least one recess (7) and the light emission surface

(5) form an edge that includes an angle ( ) that is between 100° and 170°, preferably between 120° and 150°.

Light emitting element according to claim 1 or 2,

in which the at least one recess (7) is formed by a milling, in particular a wedge-shaped cross section.

Light emission element (1) according to one of the preceding claims,

in which the first partial area (3) is cuboid.

Light emission element (1) according to one of the preceding claims,

which consists of PMMA or acrylic.

6. Light emission element (1) according to one of the preceding claims, which is formed from a multi-layer composite plate material, in particular produced by means of a casting process. 7. Light emission element (1) according to one of the preceding claims,

in which the light emission surface (5) is polished.

Light emission element (1) according to one of the preceding claims, which is designed such that an interface (6) is formed between the first subregion (3) and the portion (41) of the second subregion (4), which is in a plane (E) runs.

Lamp (2), having

- a light emitting element (1) according to one of the preceding claims and

- a lamp housing (10) on which the light-emitting element (1) is held, the lamp being designed such that the lamp housing (10) extends to the light-emitting surface (5).

Lamp (2) according to claim 9,

in which the light emission surface (5) is designed to run in a further plane (V) and the lamp housing

(10) has an outer wall surface area (17) which extends to the light emission surface (5) and which is also designed to run in the further plane (V).

1 1. Lamp (2) according to claim 9 or 10,

in which the light-emitting element (1) has the features mentioned in claim 2 and the lamp housing (10) has at least one holding element (1 1) which is used to hold the light-emitting element (1) on the

Lamp housing (10) into the at least one recess (7) of the

Light emission element (1) is arranged engagingly.

12. Lamp (2) according to one of claims 9 to 1 1,

still having - a light source (15) for emitting a light, the lamp being designed in such a way that the light emitted by the light source (15) radiates into the second partial area (4) of the light-emitting element (1) and subsequently the lamp (2 ) leaves via the first portion (3) of the light emitting element (1).

13. Lamp (2) according to one of claims 9 to 12,

still having

- A reflector element with two reflector surfaces (13, 14), which are designed and arranged in the lamp housing (10) in such a way that they face the

Light emission element (1) extends in a diverging manner.

14. Lamp (2) according to claim 13,

in which the two reflector surfaces (13, 14) are designed white, in particular painted white.