DE102008007647A1 - LED light with adjustable light source - Google Patents

Abstract

The invention relates to a luminaire (2) with a light source, which comprises at least one LED (4). Furthermore, the lamp (2) has a heat sink (6) for cooling the LED (4). The light source (4) is adjustably mounted by means of a joint arrangement (8) which has a carrier element (10) associated with the light source (4) and a guide element (12). The heat sink (6) has a recess (13) corresponding to the shape of the carrier element (10) and forms the guide element (12) of the joint arrangement (8). In this way, a relatively large connection surface for the heat flow from the carrier element (10) to the heat sink (6) can be realized, in relative terms, with an overall small dimension of the luminaire (2), since the heat sink (6) as such does not have to be movable. The hinge assembly (8) may be formed, for example, as a ball joint.

Description

The The invention relates to a luminaire having a light source with at least an LED (light emitting diode), and a heat sink for cooling the LED. The light source is mounted adjustable.

at LED lights generally it is basically necessary to ensure that the heat generated by the LED during operation is effectively dissipated "point-like" a corresponding LED is arranged on a carrier board whose Temperature about 80 ° C should not exceed. For cooling Such a LED therefore heatsinks are common, the this function are comparatively large.

in the Case of LED lights, where the direction of the light output targeted changed can be, for example, LED spotlights or LED spotlights, is customary for realizing this directionality provided that the LED and the heat sink relative to each other rigid are arranged and either the LED and the heat sink are adjusted together can or an optical element that radiates in front of the LED is arranged, can be adjusted.

Of the Invention is based on the object, an LED light with a effective cooling indicate the LED at which the direction of the light output is changed can and which can be carried out small volume.

These Task is according to the invention with the one in the independent one Claim mentioned object solved. Particular embodiments are in the dependent claims specified.

According to the invention a luminaire is provided which has a light source with at least an LED and a heat sink for cooling the LED has. In this case, the light source is by means of a joint arrangement, which is a light source associated with the carrier element and a guide element has, adjustable, in particular rotatable and / or pivotally mounted. Of the Heatsink points one of the shape of the support element corresponding recess and forms the guide element of the hinge assembly.

On that way yourself - relative seen - one especially big interface for the heat flow from the carrier element realize to the heat sink, and indeed with a total small size of the lamp, since the heat sink as such must be arranged not movable.

Advantageous The joint assembly forms a ball joint with a spherical condyle as well a socket, wherein the support element for the light source and the condyle and the recess of the heat sink forms the socket. hereby will be a particularly big one Mobility with particularly effective heat removal from the LED allows.

Advantageous is the condyle a clamping element for locking the condyle across from assigned to the heat sink. The clamping element can by a locking screw or a Clamping plate may be formed, which or which associated with a heat sink and in a funnel-shaped Recess of the condyle engaging bolt interacts.

Advantageous is the carrier element half-cylinder-shaped formed and pivotable about an axis within the recess stored the heat sink. Accordingly, the recess in this case is also at least essentially semi-cylindrical. In essence, it is intended to express that the largest areas of the support element or the recess define a semi-cylindrical shape. deviations as for example by a bolt or a locking element or similar can be caused the or in connection with the carrier element or the recess stands, should be neglected be. In the following, it is implicit in the case of corresponding form specifications from such an approximation went out.

Advantageous is the carrier element in several parts with a first semi-cylindrical part element and a second half cylinder-shaped Sub-element formed, wherein the first sub-element around a first Axis pivotally mounted within the recess of the heat sink is and the second sub-element in a further recess of the first Partial element about a second axis, which is perpendicular to the first Axis is aligned, is pivotally mounted. The others Recess is accordingly also formed semi-cylindrical.

The first sub-element may be formed as a half-shell, wherein their inner surface as storage or connection surface for the second sub-element can be used.

Advantageous the recess of the heat sink is cylindrical, preferably a circular cylinder, and the carrier element mounted rotatably about a first axis within the recess of the heat sink. The first axis of rotation can in this case with an axis of symmetry of the recess coincide.

The light source or the LED is advantageous arranged in such a way that their Hauptabstrahlrichtung encloses an obtuse angle with the main axis of the recess or of the carrier element. In this way, by a rotation of the carrier element in the recess, the emission direction of the lamp can be changed.

there can furthermore advantageously the light source or the LED on a second carrier element be arranged, which opposite the first carrier element about a second axis of rotation is rotatable, wherein the first axis of rotation and the second axis of rotation enclose an obtuse angle with each other. The two carrier elements can while cylindrical be formed, wherein the mutually facing contact surfaces of the Cylinder opposite the respective cylinder axis are inclined. In this way, for the main emission direction a comparatively large one potential Adjustment range are formed.

Advantageous the light source or the LED is associated with a cup-shaped reflector.

It can be provided that the support element with a part of his surface on a part of the surface the recess is directly or "quasi-directly" movable, so only separated by a very small gap, so that thereby a planar "contact area" between the support element and the guide element is formed. The larger the investment area In general, the better the heat can be from the carrier element go over to the guide element. For example, it can be advantageously provided that the proportion the surface the support element, which is a limit to the investment area is greater than half the entire surface the carrier element.

It can be provided that a cross section of the support element along the Boundary to the investment area reveals an arc of an angle of at least 150 °, preferably at least 180 °, for example, between 150 ° and 210 °. This is particularly advantageous if the investment area in the form of a Half cylinder has. As a result, on the one hand, a relatively large surface contact between the carrier element and the guide element and thus a good heat transfer allows On the other hand, one for usual purposes usually sufficient mobility for a pivoting movement of the support element and thus the LED opposite the guide element or the heat sink allows.

If the investment area defines a spherical or solid cylindrical shape, the of The arc enclosed angle advantageously about 360 °, provides So a circle.

Advantageous is the investment area filled with a heat paste.

It can be provided that the guide element a plain bearing for forms the carrier element, optionally additionally arranged in the investment area a lubricant is.

The Invention will be described below with reference to exemplary embodiments and with reference closer to the drawings explained. Show it:

1 a sketched perspective view of a first embodiment of a lamp according to the invention,

2 a sketch like 1 but from a different perspective,

3 and 4 further sketches for the first embodiment,

5 and 6 two outlined perspective views of a lamp according to a second embodiment, and

7 to 11 corresponding sketches to a third embodiment.

The 1 to 4 show sketches to a lamp according to the invention 2 according to a first embodiment. For better clarity, components of the luminaire are in the sketches 2 partially shown in cut-open condition.

The lamp 2 has a light source in the form of an LED 4 on, as well as a heat sink 6 which is used to cool the LED 4 serves. At the LED 4 it can be a single LED; but it can also be provided a group of multiple LEDs instead of a single LED.

In the 1 to 4 is the heat sink 6 each only partially, and shown in a cut state. The heat sink 6 For example, in a conventional manner cooling fins 7 exhibit. The LED 4 is by means of a hinge arrangement 8th adjustable. In the embodiment, the LED 4 while facing the heat sink 6 be adjusted so that thereby the direction of the light output of the lamp 2 is deliberately changed. The joint arrangement 8th indicates one of the LEDs 4 associated carrier element 10 on, as well as a guide element 12 ,

The heat sink 6 has a recess 13 on, the shape of the support element 10 equivalent. The carrier element 10 Thus, it has a surface area which is congruent with the shape and size of the inner surface of the recess 13 is. The Kühlkör by 6 forms the guide element 12 , In the sketches is the heat sink 6 as mentioned only partially shown, and only half. It is envisaged that the heat sink 6 the carrier element 10 considered in a cross-section completely annular. For example, it can be provided that the heat sink 6 in a cross section through the lamp 2 , which is normal to the main emission direction of the luminaire 2 or the LED 4 oriented, the carrier element 10 completely annular.

In the first embodiment, the LED 4 in a conventional manner on a carrier board 20 for the LED 4 arranged and the carrier board 20 is on the support element 10 arranged. In the example shown here is the LED 4 stable against the carrier element 10 arranged. The joint arrangement 8th allows movement of the carrier element 10 opposite the guide element 12 , ie opposite the heat sink 6 , Because the LED 4 with the carrier element 10 is connected, by a movement of the support element 10 opposite the guide body 12 the LED 4 be adjusted. In this way, the main emission of the lamp 2 be adjusted.

Between the carrier board 20 and the carrier element 10 is a good heat transfer allows. For this purpose, known means may be provided.

The carrier element 10 is made of a good thermally conductive material, so that of the LED 4 heat generated in the operating state via the carrier element 10 can be effectively derived.

Between the carrier element 10 and the guide element 12 is also a good heat transfer allows, so that the total heat effectively from the LED 4 to the heat sink 6 can go over and in this way a suitable cooling for the LED 4 is possible.

As mentioned, the shape of the recess corresponds 13 the shape of the support element 10 , It can therefore be provided that the carrier element 10 with a part of its surface on at least a part of the surface of the recess 13 directly or "quasi-directly" relatively movable, so only separated by a very small gap, so that in this way a planar "contact area" between the support element 10 and the guide element 12 is formed. Optionally, a heat-conducting paste and / or a lubricant may advantageously be arranged in said gap.

In general, the larger the contact area, the better the heat from the support element 10 to the guide element 12 pass. For example, it can be advantageously provided that the proportion of the surface of the carrier element 10 , which is a boundary to the abutment area, is greater than half of the entire surface of the support element 10 ,

In the first embodiment, it is provided that the carrier element 10 has substantially the shape of a truncated ball, wherein the carrier board 20 on the flat surface of the carrier element formed by the gate 10 is arranged. The investment area therefore also describes in this case a part of a spherical surface. In the example shown, the diameter of the ball is of the same order of magnitude as that of the carrier board 20 the LED 4 , For example, it may be provided in general that the carrier element 10 has a diameter which is at most ten times or at most five times the diameter of the carrier board 20 is.

Due to the shape of the carrier element 10 shows a cross section of the carrier element 10 along the boundary to the investment area generally a circular arc. Such as from the 3 and 4 is apparent, is such a continuous arc K between the points A and B at the edge of the recess 13 educated. This arc K includes an angular range of approximately 180 °. A second example of such a circular arc results - with reference to the representation of 1 to 4 - in a horizontal section through the lamp 2 at the level of the center of the shape of the support element 10 corresponding sphere. In this case, the circular arc includes 360 ° and thus represents a circular line.

By such a design of the contact area, on the one hand, a relatively large areal contact between the carrier element 10 and the guide element 12 and thus allows a good heat transfer, on the other hand is also sufficient for usual purposes mobility for a pivoting movement of the support element 10 and thus the LED 4 opposite the guide element 12 or the heat sink 6 allows. More generally, it is advantageous if such a circular arc encloses an angle of at least 150 °.

In the first embodiment, the hinge assembly 8th So a ball joint with a spherical condyle and a socket, wherein the support element 10 forms the condyle and the recess 13 of the heat sink 6 the socket.

The joint arrangement 8th can according to the first embodiment further comprises a bolt 30 have, for storage of the support element 10 opposite the heat sink 6 serves. To Arretie ren the condyle, so the support member 10 opposite the heat sink 6 may be provided a clamping element. In the example shown here is a locking screw 22 provided in a bore of the heat sink 6 is arranged and whose head 23 on one side of the heat sink 6 is arranged, that of the side of the heat sink 6 opposite, on which the LED 4 is arranged. The locking screw 22 may be provided, for example, on the bolt 30 to act. However, it can also be provided, for example, that they clamp directly onto the carrier element 10 can work.

In the in the 1 to 4 The example shown has the carrier element 10 a funnel-shaped recess 32 on, whose edge of the carrier board 20 opposite. The bolt 30 , where appropriate, the storage of the support element 10 serves, engages in the funnel-shaped recess 32 one. The locking screw 22 also engages in the funnel-shaped recess 32 and is arranged such that by tightening the locking screw 22 the bolt 30 and thus the mobility of the support element 10 opposite the heat sink 6 limited or prevented.

Instead of a locking screw, for example, a clamping plate in the manner of a vise for locking the LED 4 opposite the heat sink 6 be provided.

In the embodiment shown, the LED 4 a reflector 40 assigned. The reflector 40 For example, directly on the support element 10 be arranged.

at the further embodiments shown below are respectively for analog Components identical reference numerals used. In case of significant deviations between the embodiments are partially corresponding reference numerals with a dash or provided two strokes. Unless otherwise stated, the statements apply to the first embodiment each analog.

According to a second embodiment, which in the 5 and 6 is sketched, is for the light 2 ' a carrier element 10 ' provided, which is formed semi-cylindrical. Accordingly, the corresponding recess 13 ' semi-cylindrical.

Also in this case shows a cross section of the support element 10 ' Due to its shape along the boundary to the contact area a circular arc, which includes about 180 °: An example of this is the circular arc, with respect to the 5 and 6 in a vertical section through the lamp by the in 5 indicated points A 'and B' results.

The carrier element 10 ' is pivotable about an axis S on the heat sink 6 ' stored, for example by a bolt, as indicated in the figures. The length of said circular arc therefore varies depending on the position of the support element 10 ' relative to the heat sink 6 ' , The angle ranges preferably specified in this regard may relate, for example, to the maximum arc that can be set in this way.

The axis S can with an axis of symmetry of the support element 10 ' or whose main axis coincide.

The carrier element 10 ' can be multi-part with a first substantially semi-cylindrical part element 10a , and a second substantially semi-cylindrical part element 10b be formed, wherein the first sub-element 10a pivotable about a first axis S within the recess 13 ' of the heat sink 6 ' is stored and the second sub-element 10b in a further recess of the first part element 10a about a second axis S ', which is aligned perpendicular to the first axis S, is pivotally mounted. In this way, therefore, a gimbal is formed, which is a pivoting of the LED 4 relative to the heat sink 6 ' enabled by two axes.

The first subelement 10a can be designed in this sense as a half-shell, the inner surface as a bearing or connecting surface for the second sub-element 10b is used.

A locking of the carrier element 10 ' or optionally the carrier elements 10a and 10b For example, if necessary, via retaining tabs 15 the bolt can be provided by friction.

In the 7 to 11 is in turn sketchy a third embodiment of a lamp 2 '' shown. In this case, the recess 13 '' of the heat sink 6 '' (fully) cylindrical and formed the support element 10 '' is rotatable about a first axis of rotation R within the recess 13 '' stored.

The carrier element 10 '' in this case, in turn, by a locking element, such as a locking screw 22 '' be detectable, with the locking screw 22 '' in a bore in the heat sink 6 '' is arranged, so that they are preferably directly on the support element 10 '' can act as a pinch.

Also in this case shows a cross section of the support element 10 '' due to its shape along the boundary to the contact area a continuous circular arc, for example between the in 8th indicated two points A '' and B '', said circular arc due to the cylindrical shape of the support element 10 '' in turn 360 ° can include, so can represent a circle.

Furthermore, in this case - as in the 7 to 11 indicated - a second carrier element 11 be provided, on which the light source or the LED 4 is arranged, wherein the second carrier element 11 opposite the first carrier element 10 '' is rotatably disposed about a second axis of rotation R 'and the first axis of rotation R and the second axis of rotation R' together include an obtuse angle. This is especially in 8th indicated.

The two support elements 10 '' and 11 Thus, they can each have the shape of an obliquely truncated cylinder, wherein the oblique end faces adjoin one another and are rotatable relative to each other. For a good heat transfer between these two inclined surfaces in turn known means can be provided.

In this embodiment, the contact area due to the cylindrical shape of the support element 10 '' in principle be made arbitrarily large, by the carrier element 10 '' and the associated recess 13 '' in the heat sink 6 '' be chosen correspondingly long or low. In the variant with the two support elements 10 '' and 11 can also by a suitable choice of the angle of the oblique end faces relative to the respective major axes of the two sub-elements 10 '' and 11 a large adjustment range for the emission direction of the luminaire 2 '' be enabled.

For determining the second carrier element 11 opposite the first carrier element 10 '' can a stud 25 be provided.

2, 2 ', 2' '

lamp

4

LED

6 6 ', 6' '

heatsink

8th

joint arrangement

10 10 ', 10' '

support element

10a

first subelement

10b

second subelement

12

guide element

13 13 ', 13' '

recess in the heat sink

15

retaining tabs

20

carrier board for the LED

22 22 '

locking screw

23

head the locking screw

32

funnel-shaped recess

40

reflector

Claims (12)

Luminaire comprising - a light source with at least one LED ( 4 ) and - a heat sink ( 6 . 6 ' . 6 '' ) for cooling the LED ( 4 ), the light source ( 4 ) by means of a joint arrangement ( 8th ), which one of the light source ( 4 ) associated carrier element ( 10 . 10 ' . 10 '' ) as well as a guide element ( 12 ), is adjustable, in particular rotatable and / or pivotable, characterized in that the heat sink ( 6 . 6 ' . 6 '' ) one of the shape of the support element ( 10 . 10 ' . 10 '' ) corresponding recess ( 13 . 13 ' . 13 '' ) and the guide element ( 12 ) of the joint arrangement ( 8th ). Luminaire according to claim 1, characterized in that the joint arrangement ( 8th ) forms a ball joint with a spherical condyle and a socket, wherein the support element ( 10 ) for the light source ( 4 ) the condyle and the recess ( 13 ) of the heat sink ( 6 ) forms the socket. Luminaire according to claim 2, characterized in that the joint head a clamping element ( 22 ) for locking the condyle to the heat sink ( 6 ) assigned. Luminaire according to claim 3, characterized in that the clamping element by a locking screw ( 22 ) or a clamping plate is formed, which or which with a the heat sink ( 6 ) and in a funnel-shaped recess ( 32 ) of the condyle engaging bolt ( 30 ) cooperates. Luminaire according to claim 1, characterized in that the carrier element ( 10 ' ) of semi-cylindrical shape and about an axis (S) pivotable within the recess ( 13 ' ) of the heat sink ( 6 ' ) is stored. Luminaire according to claim 1, characterized in that the carrier element ( 10 ' ) in several parts with a first semi-cylinder-shaped subelement ( 10a ) and a second semicylinder-shaped subelement ( 10b ), wherein - the first subelement ( 10a ) about a first axis (S) pivotable within the recess ( 13 ' ) of the heat sink ( 6 ' ) and - the second subelement ( 10b ) in another off assumption of the first subelement ( 10a ) about a second axis (S '), which is aligned perpendicular to the first axis (S), is pivotally mounted. Luminaire according to claim 1, characterized in that the recess ( 13 '' ) is cylindrical and the carrier element ( 10 '' ) about a first axis of rotation (R) rotatable within the recess of the heat sink ( 6 '' ) is stored. Luminaire according to claim 7, characterized in that the light source ( 4 ) on a second carrier element ( 11 ) is arranged, which relative to the first carrier element ( 10 '' ) about a second axis of rotation (R ') is rotatable, wherein the first axis of rotation (R) and the second axis of rotation (R') form an obtuse angle with each other. Luminaire according to claim 8, characterized in that both support elements ( 10 '' . 11 ) are cylindrical, wherein the mutually facing bearing surfaces of the cylinder are inclined relative to the respective cylinder axis. Luminaire according to one of the preceding claims, characterized in that the light source or the LED ( 4 ) a pot-shaped reflector ( 40 ) assigned. Luminaire according to one of the preceding claims, characterized in that the contact area between the carrier element ( 10 . 10 ' . 10 '' ) and the guide element ( 12 ) is filled with a thermal grease. Luminaire according to one of the preceding claims, characterized in that a cross section of the carrier element ( 10 . 10 ' . 10 '' ) along the boundary to the contact area between the support element ( 10 . 10 ' . 10 '' ) and the guide element ( 12 ) shows a circular arc which includes an angular range of at least 150 °, preferably at least 180 °.