EP3199864A1 - Heat sink for a lamp and a lamp with such a heat sink - Google Patents

Abstract

A heat sink (1) for a luminaire (2) has a plate-shaped region (3) which extends in a plane (E), so that with respect to the plane (E) a first side (u) and a second thereto Side (ob) are fixed, a first receiving area (4) for a first light source (5) extending at least predominantly on the first side (u) of the plane (E), and a second receiving area (6) for a second light source (7), which extends at least predominantly on the first side (u) of the plane (E), wherein through the first receiving region (4), on the first side (u) extending first opening (8) for the passage of a formed by the first light source (5) emitted light and through the second receiving area (6), to the second side (o) facing, second opening (9) for the passage of a, from the second light source (7) emitted light.

Description

The invention relates to a heat sink for a lamp, and a lamp with such a heat sink.

From the prior art, a floor lamp with a lamp head is known, which has a frame in which optical elements are arranged. At the top, the lamp is covered with a cover element. Due to this structure, the cooling properties of the lamp are limited. In addition, a relatively large height of the lamp head, whereby the design options of the lamp with respect to their external appearance are clearly limited. In addition, the lamp consists of comparatively many items, which adversely affects the assembly.

The invention has for its object to provide a particularly suitable heat sink for a lamp, and a corresponding lamp. In particular, it should be possible - with advantageous mechanical properties - a design of a lamp head of the lamp with a particularly low height.

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

According to the invention, there is provided a heat sink for a luminaire having a plate-shaped portion extending in a plane such that with respect to the plane a first side and a second side opposite thereto are defined. Furthermore, the cooling body has a first receiving region for a first light source, which extends at least predominantly on the first side of the plane, and a second receiving region for a second light source, which likewise extends at least predominantly on the first side of the plane. In this case, by the first receiving area, a first extending on the first side Opening for the passage of a, emitted from the first light source light formed and through the second receiving portion, facing the second side, the second opening for the passage of a, emitted from the second light source light.

As a result of this configuration, it is possible in particular to arrange the two light sources substantially in one plane, as a result of which a construction with a particularly low overall height is made possible overall.

Preferably, the second receiving area is designed such that the second opening extends in the plane or parallel to the plane. This makes it possible to produce a particularly suitable light emission on the two sides of the plane.

Preferably, the heat sink is designed as a profile body, in particular designed as an extruded profile. As a result, in particular a simple and advantageous production is possible.

Preferably, the heat sink is made of a metal, for example aluminum. In this way, the heat sink has particularly suitable thermal properties.

Preferably, the heat sink is formed only one piece. This too is advantageous with respect to its thermal properties.

Preferably, the heat sink is further configured for holding a plate-shaped light guide, such that the light guide extends in the retained state between the first receiving area and the second receiving area, in particular parallel to the plane. This makes it particularly easy to achieve a large-area light output.

Preferably, a bearing surface for the second light source is formed by the second receiving area, which extends obliquely with respect to the plane. As a result, in particular an asymmetrical light output on the second side of the plane can be effected.

Preferably, the extension of the heat sink normal to the plane is less than 20 mm. This makes it possible in particular to design a lamp head of the luminaire with a particularly low overall height.

According to a second aspect of the invention, a luminaire is provided with a heat sink according to the invention.

Preferably, the lamp is designed such that in an operating state of the lamp, the heat sink is oriented such that the first side facing downward and the second side upwards. In this way, the lamp is particularly suitable for a light output down, for example, to produce a direct illumination and a light output to the top, for example, to generate indirect lighting via reflections on a corresponding ceiling.

Preferably, the lamp is designed such that an outer surface of the lamp is formed by the plate-shaped region of the heat sink. As a result, in particular a suitable heat release to the environment is possible.

Preferably, an edge region of the luminaire is formed by the second receiving region of the heat sink, wherein a further edge region of the luminaire is preferably formed by the first receiving region of the heat sink. Thus, the lamp can be designed especially with very few components.

Preferably, the first light source is arranged in the first receiving area and the second light source in the second receiving area, wherein the radiated light from the first light source of the lamp, in particular after deflection by the held with the help of the heat sink optical fiber, down to produce a direct illumination is emitted and the light generated by the second light source up to produce an indirect illumination. In this way, the lamp is particularly suitable for example as a floor lamp or pendant or pendant light.

Preferably, the lamp further comprises a translucent cover, which is arranged covering the second opening, wherein the cover is preferably designed as a light-influencing element.

Preferably, the luminaire furthermore has an end cap which is arranged, for example plugged, on an edge side of the heat sink contacting the first receptacle area and the second receptacle area.

Fig. 1

eine perspektivische Skizze einer erfindungsgemäßen Leuchte,

Fig. 2

eine perspektivische Skizze des Leuchtenkopfes von schräg oben,

Fig. 3

eine perspektivische Skizze des Leuchtenkopfes von schräg unten,

Fig. 4

eine Skizze eines Querschnitts durch den Leuchtenkopf,

Fig. 5

eine Skizze eines Querschnitts durch den Kühlkörper der Leuchte,

Fig. 6

eine Skizze mit Querschnitten durch die beiden, durch den Kühlkörper gebildeten Aufnahmebereiche,

Fig. 7

eine Skizze eines Querschnitts durch die Leuchte im Bereich des ersten Aufnahmebereichs des Kühlkörpers und

Fig. 8

eine Skizze eines Querschnitts durch die Leuchte im Bereich des zweiten Aufnahmebereichs des Kühlkörpers.

The invention is explained in more detail below with reference to an embodiment and with reference to the drawings. Show it:

Fig. 1

a perspective sketch of a lamp according to the invention,

Fig. 2

a perspective sketch of the lamp head obliquely from above,

Fig. 3

a perspective sketch of the lamp head from diagonally below,

Fig. 4

a sketch of a cross section through the lamp head,

Fig. 5

a sketch of a cross section through the heat sink of the lamp,

Fig. 6

a sketch with cross sections through the two, formed by the heat sink receiving areas,

Fig. 7

a sketch of a cross section through the lamp in the region of the first receiving area of the heat sink and

Fig. 8

a sketch of a cross section through the lamp in the region of the second receiving area of the heat sink.

Fig. 1 shows a sketch of an embodiment of a lamp 2 according to the invention, here in the form of a floor lamp. The luminaire 2 comprises a lamp base 21, a lamp post or a light column 22 and a lamp head 23.

Fig. 2 shows a perspective view of the lamp head 23 obliquely from above, Fig. 3 a view of the lamp head 23 obliquely from below. The lamp head 23 can be designed by the inventive design with suitable stability with a particularly low height.

Fig. 4 shows a cross section through the lamp head 23. The lamp head 23 comprises a heat sink 1, in a separated form in cross section in Fig. 5 outlined.

As in the example shown the case, the heat sink 1 is designed in particular as a profile part. In Fig. 2 the corresponding profile axis p is indicated; Fig. 5 shows a cross section normal to the profile axis p. Thermally advantageous, the heat sink 1 may be formed of metal, for example aluminum. Furthermore, thermally advantageous it is made up of only one piece formed. In terms of manufacturing technology, it can be designed, for example, as an extruded profile.

As in particular in Fig. 5 shown by way of example, the heat sink 1 has a plate-shaped region 3, which extends in a plane E. In the example shown, the lamp 2 is designed such that the heat sink 1 is oriented such that the plane E extends at least substantially horizontally when the lamp 2 or the lamp head 23 is in a state provided for operation. In principle, however, could also be provided a different orientation; For the sake of simplicity, it is assumed in this description that the plane E extends horizontally. This is particularly advantageous with respect to the cooling function.

The plane E defines a first side u, here "below" or below the plane E and a second side o opposite thereto, here "above" or above the plane E.

The heat sink 1 further comprises a first receiving area 4 for an example in Fig. 4 designated, first light source 5, which extends at least predominantly on the first side u and below the plane E. In particular, the first receiving area 4 may be at a first edge side - with reference to the illustration in FIG Fig. 5 on the left edge side - of the plate-shaped area 3 connect to this.

Furthermore, the heat sink 1 has a second receiving area 6 for a second light source 7. The second receiving region 6 also extends at least predominantly below the plane E or on the first side u of the plane E.

In particular, the second receiving area 6 can adjoin to the second edge side opposite the first edge side, in this case to the right of the plate-shaped area 3.

A first opening 8 for the passage of a light emitted by the first light source 5 is formed by the first receiving area 4. The first opening 8 extends below the plane E. In the example shown, the first opening 8 points to the second receiving area 6 Fig. 6 the areas around the two receiving areas 4, 6 are sketched slightly larger. In this case, the first opening 8 is indicated by a dotted line.

By the second receiving portion 6 is a, to the second side o or upwardly facing, second opening 9 for the passage of a light emitted from the second light source 7 is formed. As in Fig. 6 By way of example, the second receiving area 6 can be designed in such a way that the second opening 9 extends in the plane E or, more generally, parallel to the plane E. Thus, the light emitted by the second light source 7 can be reflected by the second opening 9 delivered above.

As in Fig. 4 sketched by way of example, the heat sink 1 is preferably further configured to hold a plate-shaped light guide 10, in such a way that the light guide 10 in the salary state between the first receiving area 4 and extends in the second receiving region 6, in particular parallel to the plane E, here below the level of the plate-shaped region 3. In the example shown, the design is such that the light emitted from the first light source 5 is irradiated into the light guide 10 and further through the downward facing surface 101 of the light guide 10 is discharged downward. The plate-shaped design of the light guide 10 can thus cause a large-area light output down.

In Fig. 7 is the first receiving portion 4 of the heat sink 1 outlined in more detail. As in the example shown, the first light source 5 LEDs 51 (LED: light-emitting diode) include, which are arranged on a circuit board 52 and in particular parallel to the profile axis p of the heat sink 1 in a row extend. In this case, a particularly planar support surface 41 for the circuit board 52 of the first light source 5 can be formed by the first receiving region 4. For example, the support surface 41 may extend perpendicular to the plane E. This design is particularly suitable for efficient irradiation of the light emitted by the first light source 5, here the LEDs 51, into a narrow edge side 102 of the light guide 10. Accordingly, the light guide 10 preferably extends in a further plane E 'parallel to the plane E, wherein also the LEDs 51 of the first light source 51 extend in this further plane E '. Also, the second light source 7 may extend in this further plane E ', whereby a total of a particularly small height of the heat sink 1 and thus also of the lamp head 23 is possible.

For a simple mounting possibility of the first light source 5 in the first receiving area 4, the latter may have a screw 42, so that the board 52 of the first light source 5 by means of a screw 17 on or in the first receiving area 4 can be screwed.

By the construction described in particular a suitable heat transfer from the first light source 5 to the heat sink 1 is made possible.

As in Fig. 8 sketched, the second light source 7 LEDs 71 may have, which are arranged on a circuit board 72 and also extend in particular parallel to the profile axis p of the heat sink 1 in a row. Preferably, a particularly planar support surface 11 for the second light source 7 is formed by the second receiving region 6, which extends obliquely in particular with respect to the plane E. As a result, an asymmetrical delivery of the light emitted by the second light source 7 is advantageously made possible upwards. For example, for this purpose, the design may be such that a third plane E "is defined by the support surface 11, which encloses an angle α with the first-mentioned plane E which is between 20 ° and 70 °, preferably between 30 ° and 50 °.

The second receiving space 6 may have a reflecting surface area for reflecting the light emitted by the second light source 7, so that a particularly efficient light emission is supported.

The described configuration of the heat sink 1 makes it possible, in particular, for the two light sources 5, 7 and the light guide 10 to be located essentially in one plane, in this case in the further plane E ', whereby a particularly low overall height is made possible. For example, the heat sink 1 may be designed such that its height or extent h normal to the plane E is less than 20 mm. In this case, the heat sink 1 can make suitable torsion resistant.

Preferably, the design is furthermore such that the following applies for the ratio between the width b and the extent h considered normal to the profile axis p: b / h> 5, in particular b / h> 10. This makes it possible, in particular, for a very flat appearance of the lamp head 23 to achieve a particularly large-area light output down.

Like, for example Fig. 4 shows, the lamp 2 is preferably designed so that an outer surface 12, here an upwardly facing o outer surface 12 of the lamp is formed by the plate-shaped portion 3 of the heat sink 1. A cover element, as usual in the aforementioned prior art, is therefore not required here. Through the heat sink 1, a quasi "housing" of the lamp 2 may be formed in the Sense that all other components of the lamp head 23 are held held on the heat sink 1.

Further preferably is - as from the FIGS. 2 and 3 shows an advantageous advantageous by the second receiving portion 6 of the heat sink 1, an edge portion 13 of the lamp 2 is formed, preferably by the first receiving portion 4 of the heat sink 1, a further edge portion 14 of the lamp 2 is formed. A separately formed corresponding lamp head frame, as usual in the aforementioned prior art, this is not required.

In the example shown, the light 2 is designed such that the light emitted by the first light source 5 is emitted from the light 2 after deflection by the light guide 10 down to produce a direct illumination. The light generated by the second light source 7 is emitted upward or obliquely above to produce an indirect illumination.

For holding the heat sink 1 to the light column 22, a curved portion 24 of the light column 22 may be provided, which - as for example from the FIGS. 2, 3 and 7 shows - holding the heat sink 1 from above and from below gripping. The bent portion 24 may, for example, as in Fig. 1 be shown S-shaped or, according to a variant, as in the FIGS. 2, 3 and 7 shown, bent in one direction only.

Preferably, the lamp further comprises a translucent cover 15, which is arranged covering the second opening 9. In this case, the cover 15 may be designed as a light-influencing element, for example as a lens, or it may be provided in addition to the cover 15, an optically active element. The cover 15 may also be designed curved upwards. The cover 15 is also advantageous with respect to electrostatic discharge protection and heat contact protection.

An optical influencing element 19 may also be provided for optically influencing the light emitted by the first light source 5, for example in FIG Shape of a plate-shaped element, which is arranged under the light guide 10. For example, this may be a lens.

In the example shown, the second receiving region 6 has a projection 61, through which a support surface for the optical waveguide 10 or the optical influencing element 19.

Preferably, the lamp further comprises an end cap 16, which is arranged on a, the first receiving portion 4 and the second receiving portion 6 contacting edge side of the heat sink 1, in particular one, with respect to the profile axis p of the heat sink 1 normally oriented edge side, for example plugged , The end cap 16 may advantageously also form a support surface for supporting a further component, for example for mounting the light guide plate 10, the cover 15 or another optically active element.

Of course, a corresponding further end cap can be provided on the opposite edge side opposite thereto.

The design of the heat sink 1 makes it possible to achieve a particularly suitable dissipation of the heat generated by the two light sources 5, 7 during operation of the luminaire. The dissipation of this heat can be achieved in particular by the fact that the heat sink 1 over its entire surface with its plate-shaped portion 3 at the top of the light guide 10 from the intended for attachment to the light column 22 area or from the other edge portion 14 of the lamp to the opposite lying edge region 13 of the lamp extends. The two light sources 5, 7 are thus substantially only each edge on the plate-shaped portion 3, but is still achieved by the one-piece design of the heat sink 1, a good heat conduction to the outer surface 12, so that an efficient heat transfer to the environment of the lamp is possible. The aforementioned edge regions 13, 14 also fulfill a protective function for the optics.

For assembling the luminaire, provision can be made for the two light sources 5, 7 to be fastened in the receiving areas 4, 6 in a first step second step of the light guide 10 and optionally further optical elements and the cover 15 are inserted and in a third step, the end caps are placed.

As a variant of the embodiment shown in the figures, it can be provided, for example, that light is irradiated not only from the first light source 5 from the left into the light guide 10, but also from a further light source from the right, wherein the second receiving region 6 is designed to hold this further light source. In particular, the further light source can also be designed as an LED board, so that, for example, two boards with LEDs are arranged in the second receiving area 6 accordingly. It may alternatively be provided on both sides populated with LEDs board.

As a further variant, it can be provided, for example, that the second receiving area - with reference to the representation of the Fig. 4 also integrated in the left edge area.

• sehr geringe Bauhöhe
• sehr gute Stabilität
• sehr gute Torsionssteifigkeit
• sehr gute Kühleigenschaften
• durch den Kühlkörper lässt sich in integrativer Weise zusätzlich zur KühlFunktion auch eine Gehäuse-Funktion und eine Rahmen-Funktion der Leuchte erfüllen
• einfache Montagemöglichkeit
• vergleichsweise wenige Bauteile
• wenige Platinen
• schmale Platinen
• einreihige LED-Platine zur Erzeugung der indirekten Beleuchtung
• kostengünstig

With the luminaire according to the invention, in particular the following advantages can be achieved:

• very low height
• very good stability
• very good torsional rigidity
• very good cooling properties
• through the heat sink can be in an integrative manner in addition to the cooling function and a housing function and a frame function of the lamp meet
• easy mounting option
• comparatively few components
• few boards
• narrow boards
• single-row LED board for the generation of indirect lighting
• economical

Claims (15)

Heatsink (1) for a luminaire (2), comprising a plate-shaped region (3) extending in a plane (E), so that with respect to the plane (E) a first side (u) and a second side (ob) opposite thereto are defined, a first receiving region (4) for a first light source (5) extending at least predominantly on the first side (u) of the plane (E), - A second receiving area (6) for a second light source (7) extending at least predominantly on the first side (u) of the plane (E), wherein by the first receiving area (4) one on the first side (u ) extending first opening (8) for the passage of, by the first light source (5) emitted light and through the second receiving portion (6), to the second side (o) facing, second opening (9) for the passage of, from the second light source (7) radiated light. Heat sink according to claim 1,
characterized,
in that the second receiving area (6) is designed such that the second opening (9) extends in the plane (E) or parallel to the plane (E). Heat sink (1) according to claim 1 or 2,
characterized,
that it is designed as a profile body, in particular designed as an extruded profile. Heat sink (1) according to one of the preceding claims,
characterized,
that it consists of a metal, for example aluminum. Heat sink (1) according to one of the preceding claims,
characterized,
that it is made up of only one piece. Heat sink (1) according to one of the preceding claims,
characterized,
in that it is furthermore configured to hold a plate-shaped optical waveguide (10) such that the optical waveguide (10) extends in the held state between the first receiving region (4) and the second receiving region (6), in particular parallel to the plane (E) , Heat sink (1) according to one of the preceding claims,
characterized,
in that a support surface (11) for the second light source (7), which extends obliquely with respect to the plane (E), is formed by the second receiving region (6). Heat sink (1) according to one of the preceding claims,
characterized,
that its extent (h) normal to the plane (E) is less than 20 mm. Luminaire (2), comprising - A heat sink (1) according to one of the preceding claims. Luminaire (2) according to claim 9,
characterized,
in that the luminaire (2) is designed in such a way that, in an operating state of the luminaire (2), the cooling body (1) is oriented such that the first side (u) points downwards and the second side (o) points upwards. Luminaire (2) according to claim 9 or 10,
characterized,
that the lamp (2) is designed such that by the plate-shaped portion (3) of the cooling body (1) an outer surface (12) is formed of the lamp (2). Luminaire (2) according to one of claims 9 to 11,
characterized,
in that an edge region (13) of the luminaire (2) is formed by the second receiving region (6) of the heat sink (1), wherein preferably a further edge region (14) of the luminaire (2) is formed by the first receiving region (4) of the heat sink (1) ) is formed. Luminaire (2) according to one of claims 9 to 12,
characterized,
in that the first light source (5) is arranged in the first receiving area (4) and the second light source (7) in the second receiving area (6), wherein the light emitted by the first light source (5) differs from the light (2), in particular after deflection by the light guide (10) supported by the heat sink (1), is emitted downwards to produce direct illumination, and the light generated by the second light source (7) is directed upwards to produce indirect illumination. Luminaire (2) according to one of claims 9 to 13,
marked by - A translucent cover (15), which is arranged covering the second opening (9), wherein the cover (15) is preferably designed as a light-influencing element. Luminaire (2) according to one of claims 9 to 14,
marked by - An end cap (16), which is arranged on a, the first receiving area (4) and the second receiving area (6) contacting edge side of the heat sink (1), for example plugged.

Images