Illumination device for a motor vehicle headlamp and motor vehicle headlamp

Abstract

A lighting device (10) for a motor vehicle headlamp, wherein the lighting device (10) comprises the following: - a cooling body (50) with a plurality of light sources (20) and a projection optics (60), - a holding body (70) for holding the projection body (60) and the cooling body (50), wherein the cooling body (50) is fastened on the holding body (70) by means of a fastening mechanism, wherein the fastening mechanism comprises at least three fastening pairs (100a), which are arranged around the optical axis (A) of the projection optics (60) equidistantly to the optical axis (A) in a cross section orthogonal to the main exit direction (X), wherein the fastening pairs (100a) comprise ribs (100) projecting from the holding body (70), which extend away from the holding body (70) against the main exit direction (X) along an extension plane (E), and comprise fixing recesses (200) matching the projecting ribs (100), which are arranged on the cooling body (50) and run through this cooling body along an axis (X1) parallel to the main exit direction (X), wherein in the fastened state (P1) for each fastening pair (100a) the rib (100) engages with the fixing recess (200) such that the rib (100) runs through the matching fixing recess (200), so that between the rib (100) and the fixing recess (200) on mutually opposite sides of the extension plane (E) of the rib (100) a space volume (210) is formed in which an adhesive (300) for fixing the rib (100) with the fixing recess (200) is arranged.

Description

Technical Field

[0001] This invention relates to a lighting device for a motor vehicle headlight, wherein the lighting device comprises the following:

[0002] - Multiple light sources, arranged on a common control circuit board.

[0003] - A cooling body for dissipating heat from multiple light sources, wherein a control circuit board for the multiple light sources is arranged on the cooling body and connected in thermal contact with the cooling body.

[0004] - A projection optics device with an optical axis, configured to image light emitted from multiple light sources in front of the illumination device along the main emission direction.

[0005] - A holder for holding the projector and the cooling body, wherein the projection optics are arranged on a first side of the holder, and wherein the cooling body, together with the control circuit board and a plurality of light sources, is fastened to a second side of the holder opposite to the first side by means of a fastening mechanism, and wherein, in order to transmit the emissive light of the light source, the holder has an illumination opening through the holder, such that the light of the light source can pass through the illumination opening from the second side to the first side and into the projection optics.

[0006] The fastening mechanism includes a coupling element disposed on a retainer and a mating coupling element disposed on a cooling body. In the fastened state of the cooling body, the coupling element engages with the corresponding mating coupling element on the retainer. The fastening mechanism includes an adhesive for securing the coupling element and the mating coupling element to each other, and each coupling element and the mating coupling element forms a fastening pair.

[0007] The present invention also relates to a motor vehicle headlight having at least one lighting device according to the invention. Background Technology

[0008] In lighting devices known from the prior art, adhesive shrinkage occurs at all bonded areas after the adhesive hardens following its introduction, leading to misalignment of the light source relative to the projection optics. This relative displacement of the cooling element, or light source, relative to the projection optics results in an undesirable blurring or other distortion of the projected image in front of the lighting device. Summary of the Invention

[0009] The purpose of this invention is to provide an improved lighting device.

[0010] This objective is achieved by the fastening mechanism comprising at least three fastening pairs, which are arranged equidistantly around the optical axis of the projection optics in a cross section orthogonal to the main emission direction.

[0011] The connecting element is configured as a rib protruding from the retainer, extending from the retainer in the opposite direction to the main emission direction along an extension plane parallel to the main emission direction of the lighting device, and wherein the rib extends in a straight line in a cross-section orthogonal to the main emission direction.

[0012] The mating element is configured as a fixing recess that matches the protruding rib. The fixing recess is arranged on the cooling body and extends through the cooling body along an axis parallel to the main emission direction.

[0013] In the fastened state, for each fastening pair, the rib engages with the fixing recess such that the rib passes through the matching fixing recess, thereby forming a spatial volume on the opposing sides of the rib's extension plane between the rib and the fixing recess, in which an adhesive for fixing the rib and the fixing recess is arranged.

[0014] The rib according to the invention improves the coating and adhesion of the adhesive.

[0015] It should be noted that the space volume formed between the ribs and the fixing recesses of each fastening pair allows for a certain gap between these components, so that when assembling the lighting device, the cooling body along with the light source can be oriented relative to the projection optics on the holder before the ribs and fixing recesses are fixed to each other by adhesive.

[0016] It can be specified that the fastening device includes at least four fastening pairs, wherein every two fastening pairs are arranged opposite each other in a cross section orthogonal to the main emission direction in the fastened state, such that the corresponding ribs or the extension planes of the ribs are arranged parallel to each other, thereby making the imaginary virtual line arranged orthogonal to the corresponding ribs or the extension planes of the ribs intersect with the optical axis of the projection optics.

[0017] Therefore, the tensile forces are optimally balanced in the event of adhesive shrinkage (i.e., shrinkage of the adhesive during hardening), because due to adhesive shrinkage, a tensile force occurs along the imaginary connection for each fastening pair, pointing away from the optical axis of the projection optics. Since each pair of fastening pairs is arranged opposite each other, the resulting tensile forces are offset to such an extent that the coolant does not experience displacement along the imaginary connection.

[0018] It can be stipulated that the imaginary virtual connection between each pair of fasteners intersects at a 90° angle in a cross section orthogonal to the main emission direction.

[0019] It can be specified that the adhesive is an adhesive that is cured by UV irradiation. In this specification, the geometry of the lighting device or cooling body is chosen such that the introduced adhesive can be irradiated by UV light; that is, the bonded area or the adhesive itself must be visible to UV irradiation.

[0020] This reduces adhesive shrinkage, thereby reducing the tensile force that occurs when the adhesive hardens.

[0021] It can be specified that, for each fastening pair, the adhesive is arranged symmetrically about the extension plane in the spatial volume.

[0022] Therefore, the direction of the tensile force formed when the adhesive hardens is again directed along a direction orthogonal to the extension plane, so as to generate a controllable tensile force in the defined direction.

[0023] After the cooling body is oriented on the retainer, the corresponding spatial volume can be different for each fastening pair, such that the formed spatial volume is larger on one side of the extension plane than on the other side. It can be specified that the amount of adhesive, such as UV adhesive, in the spatial volume also varies, wherein the amount of adhesive is proportional to the relative size of the spatial volumes of each fastening pair, i.e., less adhesive is used in a smaller spatial volume compared to a larger spatial volume. It can also be specified that for each fastening pair, in the fastened state, the spatial volume formed between the rib and the fixing recess on the opposing sides of the rib's extension plane is constructed in a cross-section orthogonal to the corresponding extension plane as a wedge shape with ends tapering in the direction of the main emission direction, such that the adhesive disposed therein is also constructed as a wedge.

[0024] It can be specified that, for each fastening pair, the fixing recess has an extending edge that extends from the fixing recess into the spatial volume and at least segmentally forms a tapering end of a wedge, such that the wedge-shaped adhesive disposed in the spatial volume is fixed against the extending portion in the direction of the main ejection direction.

[0025] It can be specified that the ribs have structured surfaces, which are used to expand the surface that can be fixed using adhesives.

[0026] This objective is also achieved by a motor vehicle headlight having at least one lighting device according to the invention. Attached Figure Description

[0027] The invention will now be explained in detail with the aid of exemplary drawings.

[0028] Here,

[0029] Figure 1An exemplary illumination device is shown, comprising projection optics and multiple light sources arranged on a control circuit board, which is secured to a cooling body. The cooling body and the projection optics are arranged or secured to a common holding body. The illumination device is configured to image the light from the light sources in front of the illumination device along a main emission direction.

[0030] Figure 2 Show Figure 1 The view of the lighting device viewed from the rear along the main emission direction, or a cross-sectional view viewed along the main emission direction, wherein the cooling body can be fastened to the retainer by means of a fastening mechanism having four fastening pairs.

[0031] Figure 3 A perspective view of a fastening pair is shown, wherein the fastening pair includes a retaining recess and a rib penetrating the retaining recess, wherein the rib is secured to the retaining recess by means of an adhesive.

[0032] Figure 4 A cross-sectional view of a cooling body with a fixed recess is shown.

[0033] Figure 5 Showing with Figure 4 A cross-sectional view of the ribs that are engaged in the fixed recess, and

[0034] Figure 6 A cross-sectional view is shown of a rib engaging with a fixing recess, wherein the rib is fixed to the fixing recess by means of an adhesive. Detailed Implementation

[0035] Figure 1 An exemplary lighting device 10 for a motor vehicle headlight is shown, wherein the lighting device 10 includes a plurality of light sources 20 arranged on a common control circuit board 30 and a cooling body 50 for dissipating heat from the plurality of light sources 20, wherein the control circuit board 30 having the plurality of light sources 20 is arranged on the cooling body 50 and is thermally connected to the cooling body.

[0036] The lighting device also includes a projection optics 60 with an optical axis A, which is configured to image light emitted from multiple light sources 20 in front of the lighting device 10 along the main emission direction X.

[0037] In addition, the lighting device 10 includes a holder 70 for holding the projector 60 and the cooling body 50, wherein the projection optics 60 are arranged on a first side S1 of the holder 70, and wherein the cooling body 50, together with the control circuit board 30 and a plurality of light sources 20, is fastened to a second side S2 of the holder 70 opposite to the first side S1 by means of a fastening mechanism.

[0038] In order to transmit the light emitted from the light source 20, the holder 70 has an illumination opening 71 that extends through the holder 70, so that the light from the light source 20 can pass through the illumination opening 71 and be transmitted from the second side S2 toward the first side S1 into the projection optics 60.

[0039] The fastening mechanism includes an engaging element 100 disposed on a retainer 70 and a mating engaging element 200 disposed on a cooling body 50. In the fastened state P1 of the cooling body 50, the engaging element 100 engages with the corresponding mating engaging element 200 on the retainer 70. The fastening mechanism includes an adhesive 300 for securing the engaging element 100 and the mating engaging element 200. In the example shown, the adhesive 300 is an adhesive that is cured by UV irradiation. Figure 2 The diagram schematically shows the engaging elements and mating engaging elements 100 and 200 in the fastened state P1.

[0040] Here, each engaging element 100 and mating engaging element 200 form a fastening pair 100a. In the example shown, the fastening mechanism includes four fastening pairs 100a, which are arranged equidistantly around the optical axis A of the projection optics 60 in a cross section orthogonal to the main emission direction X. Figure 2 As shown in the image.

[0041] The engaging element is configured as a rib 100 protruding from the retainer 70, the rib extending distally from the retainer 70 against the main emission direction X along an extending plane E parallel to the main emission direction X of the lighting device 10, as shown in... Figure 2 and Figure 3 As can be seen, rib 100 extends along a straight line G in a cross section orthogonal to the main emission direction X.

[0042] The mating element is configured as a retaining recess 200 that matches the protruding rib 100. This retaining recess is arranged on the cooling body 50 and extends through the cooling body along an axis X1 parallel to the main emission direction X, as shown in... Figure 4 As shown in the figure. Here, the fixing recess 200 extends from the inlet opening 200a for introducing the rib 100 to the outlet opening 200b through which the rib 100 can pass and through which the adhesive 300 can be disposed.

[0043] In the fastened state P1, for each fastening pair 100a, the rib 100 engages with the fixing recess 200 such that the rib 100 penetrates the matching fixing recess 200, thereby forming spatial volumes 210 on the opposing sides of the extending plane E of the rib 100 between the rib 100 and the fixing recess 200, as shown below. Figure 5 As shown in the image.

[0044] In these formed spatial volumes 210, adhesives 300 for fixing ribs 100 to fixing recesses 200 are arranged, wherein, for each fastening pair 100a, adhesives 300 are arranged symmetrically about the extending plane E in the spatial volume 210.

[0045] After the cooling body is oriented on the retainer, the corresponding space volume can be different for each fastening pair, such that the formed space volume is larger on one side of the extension plane than on the other side. It can be specified that the amount of adhesive, such as UV adhesive, in the space volume also varies, wherein the amount of adhesive is distributed in the same proportion to the relative size of the space volume of each fastening pair, i.e., less adhesive is applied in a smaller space volume compared to a larger space volume.

[0046] Here, the rib 100 may also have a structured surface, which is used to expand the surface that is fixed using the adhesive 300.

[0047] As in Figure 5 and Figure 6 As can be seen, for each fastening pair 100a, in the fastened state P1, the space volume 210 formed on the opposing sides of the extension plane E of the rib 100 between the rib 100 and the fixing recess 200 is constructed in a cross-section orthogonal to the corresponding extension plane E as a wedge shape having an end 220 tapering in the direction of the main emission direction X, such that the adhesive 300 disposed therein is also constructed as a wedge, as... Figure 6 This is shown more clearly in the text.

[0048] Here, each fastening pair 100a has a retaining recess 200 with a protruding edge 230 that extends from the surrounding surface of the retaining recess 200 into the spatial volume 210 and at least segmentally defines the tapering end 220 of the wedge, such that the wedge-shaped adhesive 300 arranged in the spatial volume 210 is fixed against the protrusion in the direction of the main emission direction X.

[0049] Here, viewed in a cross-section parallel to the main emission direction X, the fixing recess 200 has an adhesive section 240 and an inlet section 250, in which adhesive 300 is introduced. The adhesive section 240 extends from the outlet opening 200b of the fixing recess 200 to the protruding edge 230, while the inlet section 250 extends from the inlet opening 200a to the protruding edge 230.

[0050] Furthermore, each pair of fastening pairs 100a is arranged opposite each other in a cross section orthogonal to the main emission direction X in the fastened state P1, such that the corresponding ribs 100, or rather, the extension planes E of the ribs 100, are arranged parallel to each other, thereby causing the imaginary virtual line L orthogonal to the corresponding ribs 100, or rather, the extension planes E of the ribs 100, to intersect with the optical axis A of the projection optics 60, as shown below. Figure 2 As shown.

[0051] In the example shown, the imaginary virtual line L between each pair of fasteners 100a intersects at a 90° angle in a cross section orthogonal to the main emission direction X.

[0052] List of reference numerals

[0053] Lighting fixtures… 10

[0054] Light source… 20

[0055] Touch circuit board… 30

[0056] Cooling body… 50

[0057] Projection optics… 60

[0058] Maintain body... 70

[0059] Illuminate the opening… 71

[0060] Ribs… 100

[0061] Fastening to… 100a

[0062] Fixed recess… 200

[0063] Entrance opening… 200a

[0064] Exit opening… 200b

[0065] Space volume… 210

[0066] Tapered ends… 220

[0067] Extending from the edge… 230

[0068] Adhesive… 300

[0069] Optical axis… A

[0070] Extended plane… E

[0071] Straight line... G

[0072] Connect... L

[0073] Tightened condition… P1

[0074] First side… S1

[0075] Second side… S2

[0076] Main launch direction... X

[0077] Axis... X1.

Claims

1. A lighting device (10) for a motor vehicle headlight, wherein the lighting device (10) comprises: - Multiple light sources (20), the multiple light sources are arranged on a common control circuit board (30), - A cooling body (50) for dissipating heat from the plurality of light sources (20), wherein the control circuit board (30) having the plurality of light sources (20) is arranged on the cooling body (50) and thermally connected to the cooling body. - A projection optics device (60) having an optical axis (A), the projection optics device (60) being configured to enable light emitted from the plurality of light sources (20) to form an image in front of the illumination device (10) along the main emission direction (X), - A holder (70) for holding the projection optics (60) and the cooling body (50), wherein the projection optics (60) is arranged on a first side (S1) of the holder (70), and wherein the cooling body (50), together with the control circuit board (30) and the plurality of light sources (20), is fastened by means of a fastening mechanism to a second side (S2) of the holder (70) opposite to the first side (S1), and wherein, in order to transmit the emissive light of the light source (20), the holder (70) has an illumination opening (71) through the holder (70), such that the light energy of the light source (20) passes through the illumination opening (71) and is transmitted from the second side (S2) toward the first side (S1) into the projection optics (60). The fastening mechanism includes an engaging element disposed on the retainer (70) and a mating engaging element disposed on the cooling body (50) that matches the engaging element. In the fastened state (P1) of the cooling body (50), the engaging element engages with the correspondingly mating mating engaging element on the retainer (70). The fastening mechanism includes an adhesive (300) for securing the engaging element and the mating engaging element to each other, and each engaging element and the mating engaging element forms a fastening pair (100a). Its features are, The fastening mechanism includes at least three fastening pairs (100a), which are arranged equidistant from the optical axis (A) of the projection optics (60) in a cross section orthogonal to the main emission direction (X). The connecting element is configured as a rib (100) protruding from the retainer (70), the rib extending distally from the retainer (70) against the main emission direction (X) along an extension plane (E) parallel to the main emission direction (X) of the lighting device (10), and wherein the rib (100) extends along a straight line (G) in a cross section orthogonal to the main emission direction (X), and The mating engagement element is configured as a retaining recess (200) that matches the protruding rib (100), the retaining recess being arranged on the cooling body (50) and extending through the cooling body along an axis (X1) parallel to the main emission direction (X). In the fastened state (P1), for each fastening pair (100a), the rib (100) engages with the fixing recess (200) such that the rib (100) penetrates the matching fixing recess (200), such that a space volume (210) is formed between the rib (100) and the fixing recess (200) on the opposing sides of the extension plane (E) of the rib (100), and the adhesive (300) for fixing the rib (100) to the fixing recess (200) is arranged in the space volume (210). For each fastening pair (100a), the space volume (210) is configured in a cross-section orthogonal to the corresponding extension plane (E) as a wedge shape having an end (220) tapering in the direction of the main emission direction (X), such that the adhesive (300) disposed therein is also configured as a wedge. For each fastening pair (100a), the fixing recess (200) has an extending edge (230) that extends from the fixing recess (200) into the space volume (210) and at least segmentally defines the tapered end (220) of the wedge, such that the wedge-shaped adhesive (300) disposed in the space volume (210) is fixed against the extension in the direction of the main emission direction (X).

2. The lighting device according to claim 1, characterized in that, The fastening mechanism includes at least four fastening pairs (100a), wherein, in the fastened state (P1), every two fastening pairs (100a) are arranged opposite each other in a cross section orthogonal to the main emission direction (X), such that the corresponding ribs (100) are arranged parallel to each other, thereby causing an imaginary virtual line (L) orthogonal to the arrangement of the corresponding ribs (100) to intersect with the optical axis (A) of the projection optics (60).

3. The lighting device according to claim 2, characterized in that, The imaginary virtual connection (L) between each pair of fasteners (100a) intersects at a 90° angle in a cross section orthogonal to the main emission direction (X).

4. The lighting device according to any one of claims 1 to 3, characterized in that, The adhesive (300) is an adhesive that is cured by UV irradiation.

5. The lighting device according to any one of claims 1 to 3, characterized in that, For each fastening pair (100a), the adhesive (300) is arranged symmetrically about the extension plane (E) in the spatial volume (210).

6. The lighting device according to any one of claims 1 to 3, characterized in that, The rib (100) has a structured surface for expanding the surface that is fixed using the adhesive.

7. A motor vehicle headlight, characterized in that, The motor vehicle headlight has at least one lighting device according to any one of claims 1 to 6.

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