Illumination device for automobile floodlights

Abstract

An improved illumination device is provided that prevents the image to be projected in front of the illumination device from becoming blurred or other aberrations occurring due to relative displacement of a cooling body or a light source with respect to a projection optical system. [Solution] An illumination device (10) for an automobile floodlight, the illumination device (10) includes the following: a cooling body (50) having a plurality of light sources (20), a projection optical system (60), and a holder (70) for holding the projection optical system (60) and the cooling body (50), the cooling body (50) is fixed to the holder (70) using a fixing device, the fixing device including at least three fixing pairs (100a), the fixing pairs (100a) being arranged around the optical axis (A) of the projection optical system (60) at equal intervals relative to the optical axis (A) in a cross section perpendicular to the main radiation direction (X), one fixing pair (100a) including one rib portion (100) protruding from the holder (70), the rib portion (100) extending from the holder (70) in a direction opposite to the main radiation direction (X) along a predetermined extension plane (E). The fixed pair (100a) includes a position fixing hole (200) corresponding to the protruding rib portion (100), the position fixing hole (200) is disposed in the cooling body (50) and penetrates the cooling body (50) along a predetermined axis (X1) parallel to the main radiation direction (X). In the fixed state (P1), the rib portion (100) of each fixed pair (100a) is aligned with the extension surface of the rib portion (100). The rib portion (100) is engaged with the position fixing hole portion (200) so that a spatial volume portion (210) is formed between the rib portion (100) and the position fixing hole portion (200) on each of the opposing sides of (E), and an adhesive (300) is disposed within the spatial volume portion (210a) to fix the position of the rib portion (100) in the position fixing hole portion (200).

Description

[Technical field]

[0001] The present invention relates to an illumination device for a motor vehicle floodlight, said illumination device comprising: a plurality of light sources arranged on a common control board; - a cooling body (heat sink) for dissipating heat from the plurality of light sources, the control board having the plurality of light sources being disposed in the cooling body and being connected in thermal contact with the cooling body, a projection optical system (projection optical unit) having an optical axis, the projection optical system being configured to image light radiable from a plurality of light sources in front of the illumination device in a main emission direction, - a holder for holding the projection optical system and the cooling body, wherein the projection optical system is arranged on a first side of the holder, and the cooling body, together with the control board and the plurality of light sources, is fixed by a fixing device on a second side of the holder opposite the first side, and the holder has an illumination opening passing through the holder for passing light that can be emitted from the light source, so that the light from the light source can be irradiated through the illumination opening from the second side to the first side to the projection optical system; The fixing device includes a plurality of engaging elements arranged on the holding body and a corresponding plurality of opposing engaging elements arranged on the cooling body, the engaging elements being in an engaging state with the corresponding opposing engaging elements when the cooling body is fixed on the holding body, the fixing device including an adhesive for fixing the engaging elements and the opposing engaging elements in position in an engaged state with each other, and each one engaging element and one opposing engaging element forming a fixed pair.

[0002] The invention further relates to a motor vehicle floodlight comprising at least one illumination device according to the invention. [Background technology]

[0003] Irradiation devices are known from the prior art. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] French Patent Application Publication No. 3049682 [Patent Document 2] US Patent Application Publication No. 2016 / 146423 [Patent Document 3] European Patent Application Publication No. 2450622 Summary of the Invention [Problem to be solved by the invention]

[0005] In the illumination devices known from the prior art, after the adhesive is applied, the adhesive shrinks at all adhesive points due to its hardening, which leads to an incorrect positioning of the light source relative to the projection optics, which causes a relative displacement of the cooling body or the light source relative to the projection optics, which leads to undesirable blurring of the image to be projected in front of the illumination device or other aberrations.

[0006] It is an object of the present invention to provide an improved illumination device. [Means for solving the problem]

[0007] The above problem is solved by the following configuration, namely: the fixing device includes at least three fixing pairs, which are arranged around the optical axis of the projection optical system at equal intervals relative to the optical axis in a cross section perpendicular to the main radiation direction; In this case, the engaging element is configured as a rib portion (protrusion portion) protruding from the holder, and the rib portion extends along a predetermined extension plane parallel to the main radiation direction of the irradiation device so as to move away from the holder in the opposite direction to the main radiation direction, and in this case, the rib portion extends along a predetermined straight line in a cross section perpendicular to the main radiation direction, In this case, the counter engaging element is configured as a position fixing recess corresponding to the protruding rib, the position fixing recess being disposed in the cooling body and penetrating the cooling body along a predetermined axis parallel to the main radiation direction, In this case, in the fixed state, the rib portions of each fixed pair are engaged with the position fixing holes so that spatial volume portions are formed between the rib portions and the position fixing holes on the mutually facing sides (both sides of the extension surfaces of the rib portions) of the extending surfaces of the rib portions, the rib portions pass through the corresponding position fixing holes, and an adhesive is provided in the spatial volume portions to fix the positions of the rib portions and the position fixing holes. This is solved by: That is, according to the first aspect of the present invention, 1. An illumination device for an automobile floodlight, said illumination device comprising: a plurality of light sources arranged on a common control board; a cooling body for dissipating heat from the plurality of light sources, the control board including the plurality of light sources being disposed in the cooling body and being thermally connected to the cooling body; - a projection system having an optical axis, the projection system being configured to image light radiable from a plurality of the light sources in a direction of a main emission direction in front of the illumination device, - a holder for holding the projection optical system and the cooling body, wherein the projection optical system is disposed on a first side of the holder, and the cooling body is fixed together with the control board and the plurality of light sources on a second side of the holder opposite the first side by using a fixing device, and the holder has an illumination opening penetrating the holder for passing light that can be emitted from the light sources, so that light from the light sources can be irradiated through the illumination opening from the second side to the first side toward the projection optical system, the fixing device includes a plurality of engaging elements arranged on the holder and a plurality of corresponding opposing engaging elements arranged on the cooling body, the engaging elements being in an engaging state with the corresponding opposing engaging elements when the cooling body is fixed on the holder, the fixing device includes an adhesive for fixing the engaging elements and the opposing engaging elements in position in the mutually engaged state, and each of the engaging elements and the opposing engaging elements constitutes a fixed pair, and the fixing device includes at least three of the fixing pairs, the fixing pairs being arranged around the optical axis line of the projection optical system at equal intervals from the optical axis line in a cross section perpendicular to the main radiation direction; The engaging element is configured as a rib portion protruding from the holding body, the rib portion extending along a predetermined extension plane parallel to the main radiation direction of the irradiation device so as to move away from the holding body in a direction opposite to the main radiation direction, and the rib portion extends along a predetermined straight line in a cross section perpendicular to the main radiation direction, The counter engagement element is configured as a position fixing hole corresponding to the protruding rib, the position fixing hole being disposed in the cooling body and penetrating the cooling body along a predetermined axis parallel to the main radiation direction; when the cooling body is fixed on the holder, the rib portions for each fixed pair are engaged with the position fixing holes so that the rib portions pass through the corresponding position fixing holes, so that spatial volume portions are formed between the rib portions and the position fixing holes on the mutually facing sides of the extending surfaces of the rib portions, and the adhesive for fixing the position of the rib portions to the position fixing holes is disposed within the spatial volume portions; An illumination device is provided, characterized in that More specifically, in the first aspect, 1. An illumination device for an automobile floodlight, said illumination device comprising: a plurality of light sources arranged on a common control board; a cooling body for dissipating heat from the plurality of light sources, the control board including the plurality of light sources being disposed in the cooling body and being thermally connected to the cooling body; - a projection system having an optical axis, the projection system being configured to image light radiable from a plurality of the light sources in a direction of a main emission direction in front of the illumination device, - a holder for holding the projection optical system and the cooling body, wherein the projection optical system is disposed on a first side of the holder, and the cooling body is fixed together with the control board and the plurality of light sources on a second side of the holder opposite the first side by using a fixing device, and the holder has an illumination opening penetrating the holder for passing light that can be emitted from the light sources, so that light from the light sources can be irradiated through the illumination opening from the second side to the first side toward the projection optical system, the fixing device includes a plurality of engaging elements disposed on the holder and a plurality of corresponding opposing engaging elements disposed on the cooling body, the engaging elements being in an engaging state with the corresponding opposing engaging elements when the cooling body is fixed on the holder, the fixing device includes an adhesive for positionally fixing the engaging elements and the opposing engaging elements in an engaged state with each other, and each of the engaging elements and the opposing engaging elements constitutes a fixed pair, and the fixing device includes at least three of the fixing pairs, the fixing pairs being arranged around the optical axis line of the projection optical system at equal intervals from the optical axis line in a cross section perpendicular to the main radiation direction; The engaging element is configured as a rib portion protruding from the holding body, the rib portion extending along a predetermined extension plane parallel to the main radiation direction of the irradiation device so as to move away from the holding body in a direction opposite to the main radiation direction, and the rib portion extends along a predetermined straight line in a cross section perpendicular to the main radiation direction, The counter engagement element is configured as a position fixing hole corresponding to the protruding rib, the position fixing hole being disposed in the cooling body and penetrating the cooling body along a predetermined axis parallel to the main radiation direction; when the cooling body is fixed on the holder, the rib portions for each fixed pair are engaged with the position fixing holes so that the rib portions pass through the corresponding position fixing holes, so that spatial volume portions are formed between the rib portions and the position fixing holes on the mutually facing sides of the extending surfaces of the rib portions, and the adhesive for fixing the position of the rib portions to the position fixing holes is disposed within the spatial volume portions; It is characterized by: According to a second aspect of the present invention, A vehicle floodlight is provided comprising at least one illumination device as described above. It should be noted that the reference numerals in the claims of the present application are intended solely to facilitate understanding of the present invention and are not intended to limit the present invention to the illustrated forms. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] In the present invention, the following configurations are possible. (Form 1) 1. An illumination device for an automobile floodlight, said illumination device comprising: a plurality of light sources arranged on a common control board; a cooling body for dissipating heat from the plurality of light sources, the control board including the plurality of light sources being disposed in the cooling body and being thermally connected to the cooling body; - a projection system having an optical axis, the projection system being configured to image light radiable from a plurality of the light sources in a direction of a main emission direction in front of the illumination device, - a holder for holding the projection optical system and the cooling body, wherein the projection optical system is disposed on a first side of the holder, and the cooling body is fixed together with the control board and the plurality of light sources on a second side of the holder opposite the first side by using a fixing device, and the holder has an illumination opening penetrating the holder for passing light that can be emitted from the light sources, so that light from the light sources can be irradiated through the illumination opening from the second side to the first side toward the projection optical system, the fixing device includes a plurality of engaging elements arranged on the holder and a plurality of corresponding opposing engaging elements arranged on the cooling body, the engaging elements being in an engaging state with the corresponding opposing engaging elements when the cooling body is fixed on the holder, the fixing device includes an adhesive for fixing the engaging elements and the opposing engaging elements in position in the mutually engaged state, and each of the engaging elements and the opposing engaging elements constitutes a fixed pair, and the fixing device includes at least three of the fixing pairs, the fixing pairs being arranged around the optical axis line of the projection optical system at equal intervals from the optical axis line in a cross section perpendicular to the main radiation direction; The engaging element is configured as a rib portion protruding from the holding body, the rib portion extending along a predetermined extension plane parallel to the main radiation direction of the irradiation device so as to move away from the holding body in a direction opposite to the main radiation direction, and the rib portion extends along a predetermined straight line in a cross section perpendicular to the main radiation direction, The counter engagement element is configured as a position fixing hole corresponding to the protruding rib, the position fixing hole being disposed in the cooling body and penetrating the cooling body along a predetermined axis parallel to the main radiation direction; In a fixed state, the rib portion of each fixed pair is engaged with the position fixing hole portion so that the rib portion passes through the corresponding position fixing hole portion, so that a spatial volume portion is formed between the rib portion and the position fixing hole portion on each of the opposing sides of the extending surface of the rib portion, and the adhesive for fixing the position of the rib portion to the position fixing hole portion is disposed within the spatial volume portion. (Form 2) It is preferable that the fixing device includes at least four of the fixed pairs, each of which, in a fixed state, two of the fixed pairs are arranged facing each other such that the respective rib portions are arranged parallel to each other in a cross section perpendicular to the main radiation direction, whereby an assumed virtual connecting line arranged perpendicular to each of the rib portions intersects with the optical axis of the projection optical system. (Form 3) Preferably, the imaginary connecting lines assumed between each two of the fixed pairs intersect each other at an angle of 90° in a transverse plane perpendicular to the main radiation direction. (Form 4) Preferably, the adhesive is a UV radiation curable adhesive. (Form 5) It is preferable that the adhesive be disposed symmetrically with respect to the extending surface within the spatial volume for each of the fixed pairs. (Form 6) It is preferable that the spatial volume portion formed between the rib portion and the position fixing hole portion on the mutually facing sides of the extension surface of the rib portion in the fixed state is configured, for each fixed pair, in the shape of a wedge-forming portion having a tapered end in the direction of the main radial direction in a cross section perpendicular to the corresponding extension surface, whereby the adhesive disposed therein is likewise configured as a wedge-forming portion. (Form 7) It is preferred that for each fixed pair, the position fixing hole has a pull-out edge, which extends from the position fixing hole into the spatial volume and at least partially defines the tapered end of the wedge configuration, whereby the adhesive disposed in the spatial volume and configured as the wedge configuration is secured against pull-out in the direction of the main radial direction. (Form 8) The ribs preferably have a structured surface to provide an increased surface area for fixing in place with the adhesive. (Form 9) An automobile floodlight comprising at least one irradiation device according to any one of the first to eighth aspects.

[0009] Such ribs according to the present invention improve adhesive application and adhesion.

[0010] It should be noted that the spatial volume that arises between the rib portions and the position fixing holes for each fixing pair allows a certain amount of play between these components, so that when assembling the illumination device, the cooling body together with the light source can be aligned in the holder relative to the projection optics before the rib portions and the position fixing holes are fixed to each other by adhesive.

[0011] The fixing device can include at least four fixing pairs, in which each two fixing pairs are arranged opposite one another in a cross section perpendicular to the main radiation direction in the fixed state, such that the extension surfaces of the respective rib portions or rib portions are arranged parallel to one another, so that an imagined virtual connecting line arranged perpendicular to the respective rib portions or rib portions intersects with the optical axis of the projection optical system.

[0012] In addition, tensile forces are optimally compensated for in the event of adhesive shrinkage (i.e. shrinkage of the adhesive during hardening), since this generates for each fixed pair a tensile force along the imaginary connecting line, which tensile force is directed away from the optical axis of the projection optics. Due to the arrangement of two fixed pairs facing each other, the tensile forces that occur cancel each other out, as long as no displacement of the cooling body takes place along the imaginary connecting line.

[0013] Imaginary connecting lines imagined between each two fixed pairs can intersect each other at an angle of 90° in a transverse plane perpendicular to the main radiation direction.

[0014] The adhesive can be an adhesive that cures by UV radiation. The geometry of the irradiation device or cooling body is selected to allow irradiation of the resulting adhesive with UV light, i.e. the bonding site or adhesive must be accessible for UV irradiation.

[0015] In this regard, the predetermined geometry reduces adhesive shrinkage, thereby reducing the tensile forces that occur when the adhesive cures.

[0016] The adhesive may be disposed symmetrically with respect to the extending surface within the spatial volume for each fixed pair.

[0017] Thereby, the direction of the tensile force which occurs upon hardening of the adhesive is additionally again directed perpendicularly to the extension plane in order to generate a controllable tensile force in a defined direction.

[0018] After the cooling body is aligned with the holder, the corresponding spatial volumes for each fixed pair may not be the same, so that on one side of the extension surface the resulting spatial volume is larger than on the other side of the extension surface, while taking into consideration that the amount of adhesive, e.g. the amount of UV adhesive, in the spatial volumes changes as well, and while the amount of adhesive is distributed in the same proportion to the size of the mutual spatial volumes for each fixed pair, i.e. in the smaller spatial volumes a smaller amount of adhesive is arranged than in the larger spatial volumes.

[0019] The spatial volume portion formed between the rib portion and the position fixing hole portion on the mutually facing sides (both sides of the extension surface of the rib portion) of the extension surface of the rib portion in the fixed state can be configured, for each fixed pair, in the shape of a wedge-forming portion having a tapered end in the direction of the main radial direction in a cross section perpendicular to the corresponding extension surface, whereby the adhesive disposed therein is likewise configured as a wedge-forming portion.

[0020] For each fixed pair, the position fixing hole portion has a pull-out edge (protruding edge portion), which extends from the position fixing hole portion into the spatial volume portion and at least partially forms a tapered end of the wedge configuration portion, whereby the adhesive disposed in the spatial volume portion and configured as a wedge configuration portion is secured against pull-out in the direction of the main radial direction.

[0021] The ribs can have a structured surface (any surface other than a flat surface, e.g. a surface having projections and recesses, etc.) to enlarge the surface area for fixing in position with an adhesive.

[0022] The object is likewise achieved by a vehicle floodlight comprising at least one illumination device according to the invention.

[0023] The invention will now be explained in more detail with reference to the illustrative drawings. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 shows an exemplary illumination device with a projection optical system and multiple light sources, the light sources being arranged on a control board fixed on a cooling body, the cooling body and the projection optical system being arranged or fixed on a common holder, and the illumination device being configured to image the light of the light sources in the main emission direction in front of the illumination device. [Diagram 2] 2 shows the irradiation device of FIG. 1 in a rear view in the main radiation direction and in a cross-sectional view in the main radiation direction, in which the cooling body can be fixed to the holder by means of a fixing device having four fixing pairs. [Diagram 3] FIG. 13 shows an oblique view of one fixed pair, where the fixed pair includes a position fixing hole portion and a rib portion passing through the position fixing hole portion, where the rib portion is fixed in position with the position fixing hole portion using an adhesive. [Figure 4] FIG. 2 shows a cross-sectional view of a cooling body having a position fixing hole. [Diagram 5] 5 is a cross-sectional view of a rib portion in engagement with the position fixing hole portion of FIG. 4. FIG. [Figure 6] FIG. 2 shows a cross-sectional view of a rib engaged with a position fixing hole, the rib being fixed in position with the position fixing hole using an adhesive. EXAMPLES

[0025] FIG. 1 shows an exemplary illumination device 10 for an automobile floodlight, in which the illumination device 10 includes a plurality of light sources 20 arranged on a common control board 30 and a cooling body (heat sink) 50 for dissipating heat from the plurality of light sources 20, and in which the control board 30 having the plurality of light sources 20 is arranged on the cooling body 50 and is thermally connected to the cooling body 50.

[0026] The illumination device 10 further includes a projection optical system (projection optical unit) 60 having an optical axis A, and the projection optical system 60 is configured to image the light radiable from the multiple light sources 20 in front of the illumination device 10 in the main emission direction X.

[0027] In addition, the irradiation device 10 includes a holder 70 for holding the projection optical system 60 and the cooling body 50, where the projection optical system 60 is arranged on a first side S1 of the holder 70, and where the cooling body 50, together with the control board 30 and the multiple light sources 20, is fixed using a fixing device on a second side S2 opposite the first side S1 of the holder 70.

[0028] The holder 70 has an illumination opening 71 penetrating the holder 70 to allow light emitted by the light source 20 to pass therethrough, such that the light from the light source 20 can be irradiated through the illumination opening 71 from the second side S2 to the first side S1 and onto the projection optical system 60.

[0029] The fixing device includes a plurality of engagement elements 100 arranged on the holder 70 and a corresponding plurality of counter engagement elements 200 arranged on the cooling body 50, and the engagement elements 100 are in an engagement state with the corresponding counter engagement elements 200 in a state P1 in which the cooling body 50 is fixed on the holder 70, and the fixing device includes an adhesive 300 for fixing the engagement elements 100 and the counter engagement elements 200 in position in the mutually engaged state. In the illustrated example, the adhesive 300 is an adhesive that is cured by UV irradiation. A depiction of the engagement elements 100 and the counter engagement elements 200 in an engaged state in the fixed state P1 is shown diagrammatically in FIG. 2.

[0030] In this case, one engaging element 100 and one opposing engaging element 200 each constitute one fixed pair 100a, and in this case, the fixing device in the illustrated example includes four fixed pairs 100a, which are arranged around the optical axis A of the projection optical system 60 at equal intervals relative to the optical axis A in a cross section perpendicular to the main radiation direction X shown in Figure 2.

[0031] The engaging element is configured as a rib portion (protrusion) 100 protruding from the holder 70, and the rib portion 100 extends along a predetermined extension plane E parallel to the main radiation direction X of the irradiation device 10 in a direction opposite to the main radiation direction X, away from the holder 70, as seen in Figures 2 and 3, and at this time, the rib portion 100 extends along a predetermined straight line G in a cross section perpendicular to the main radiation direction X.

[0032] The opposing engagement element is configured as a position fixing hole (fix recess) 200 corresponding to the protruding rib portion 100, and the position fixing hole 200 is disposed in the cooling body 50 as shown in Fig. 4 and penetrates the cooling body 50 along a predetermined axis X1 parallel to the main radiation direction X. In this case, the position fixing hole 200 extends from an inlet opening 200a for inserting the rib portion 100 to an outlet opening 200b, through which the rib portion 100 can be passed and through which an adhesive 300 can be disposed.

[0033] In the fixed state P1, for each fixed pair 100a, the rib portion 100 is engaged with the position fixing hole portion 200 so that the rib portion 100 passes through the corresponding position fixing hole portion 200 so that a spatial volume portion 210 is formed between the rib portion 100 and the position fixing hole portion 200 on the mutually facing sides of the extension surface E of the rib portion 100 (on both sides of the extension surface E of the rib portion 100), as shown in FIG.

[0034] An adhesive 300 is disposed within the formed spatial volume portion 210a for fixing the position of the rib portion 100 to the position fixing hole portion 200. At this time, the adhesive 300 is disposed symmetrically with respect to the extension plane E within the spatial volume portion 210 for each fixing pair 100a.

[0035] After the cooling body 50 is aligned with the holding body 70, the corresponding spatial volumes 210 for each fixed pair 100a may not be the same, so that the resulting spatial volume 210 on one side of the extending surface E is larger than that on the other side of the extending surface E. In this case, it is considered that the amount of adhesive 300, for example the amount of UV adhesive, in the spatial volume 210 changes in the same manner, and in this case, the amount of adhesive 300 is in the same proportion to the size of each spatial volume 210 for each fixed pair 100a, i.e., a smaller amount of adhesive 300 is disposed in the smaller spatial volume 210 than in the larger spatial volume 210.

[0036] Furthermore, in this case, the rib portion 100 can have a structured surface portion (any surface portion different from a flat surface portion: for example, a surface portion having projections and recesses, etc.) in order to enlarge the surface portion for fixing in position using the adhesive 300.

[0037] As can be seen in Figures 5 and 6, in the fixed state P1, the spatial volume portions 210 formed between the rib portions 100 and the position fixing hole portions 200 on the opposing sides (on both sides of the extension surface E of the rib portions 100) of the extension surface E of the rib portions 100 are configured in the shape of a wedge-shaped portion having a tapered end portion 220 in the direction of the main radial direction X in a cross section perpendicular to the corresponding extension surface E for each fixed pair 100a, whereby the adhesive 300 disposed therein is similarly configured as a wedge-shaped portion, as is more clearly shown in Figure 6.

[0038] In this case, for each fixed pair 100a, the position fixing hole portion 200 has an (anti-)pull-out edge portion (projecting edge portion or shoulder portion) 230 which extends from the side portion of the position fixing hole portion 200 into the spatial volume portion 210 and at least partially defines the tapered end portion 220 of the wedge configuration, whereby the adhesive 300 disposed in the spatial volume portion 210 and configured as a wedge configuration is secured against pull-out in the direction of the main radial direction X.

[0039] In this case, the fixing hole 200 has, in a cross section parallel to the main radial direction X, an adhesive portion 240, into which the adhesive 300 is provided, and an inlet portion 250. The adhesive portion 240 extends from the outlet opening 200b of the fixing hole 200 as far as the withdrawal edge 230, whereas the inlet portion 250 extends from the inlet opening 200a as far as the withdrawal edge 230.

[0040] Furthermore, in the fixed state P1, each of the two fixed pairs 100a is arranged facing each other such that in a cross section perpendicular to the main radiation direction X, the extension surfaces E of the respective rib portions 100 or rib portions 100 are arranged parallel to each other, so that an assumed virtual connection line L arranged perpendicular to the extension surfaces E of the respective rib portions 100 or rib portions 100 intersects with the optical axis A of the projection optical system 60, as shown in FIG. 2.

[0041] An imaginary connection line L assumed between each two fixed pairs 100a intersects at an angle of 90° (forms a diagonal line) in a cross section perpendicular to the main radiation direction X in the illustrated example. [Explanation of symbols]

[0042] 10 Irradiation device 20 light source 30 Control Board 50 Cooling body 60 Projection optical system 70 Holding body 71 Irradiation opening 100 Engagement element (rib portion) 100a fixed pair 200 Opposing engagement element (position fixing hole) 200a inlet opening 200b exit opening 210 Spatial volume 220 Tapered End 230 Pull-out edge (extending edge) 240 Adhesive part 250 Entrance section 300 Adhesive A Optical axis line E extension plane G straight line L Virtual connection line P1 Fixed state S1 First side S2 2nd side X Main radiation direction X1 axis

Claims

1. A lighting device for a vehicle floodlight, said lighting device (10) comprising: a plurality of light sources (20) arranged on a common control board (30); a cooling body (50) for dissipating heat from the plurality of light sources (20), the control board (30) comprising the plurality of light sources (20) being arranged in the cooling body (50) and being thermally connected to the cooling body (50); a projection optical system (60) having an optical axis (A), said projection optical system (60) being adapted to image the light radiable from a plurality of said light sources (20) in front of said illumination device (10) in a main emission direction (X), a holder (70) for holding the projection optical system (60) and the cooling body (50), wherein the projection optical system (60) is arranged on a first side (S1) of the holder (70), and the cooling body (50) is fixed together with the control board (30) and the plurality of light sources (20) on a second side (S2) of the holder (70) opposite the first side (S1) by means of a fixing device, and the holder (70) has an irradiation opening (71) penetrating the holder (70) for passing light that can be emitted by the light sources (20), so that the light of the light sources (20) can be irradiated through the irradiation opening (71) from the second side (S2) towards the first side (S1) to the projection optical system (60), The fixing device includes a plurality of engaging elements (100) arranged on the holding body (70) and a corresponding plurality of opposing engaging elements (200) arranged on the cooling body (50), the engaging elements (100) are in an engaged state with the corresponding opposing engaging elements (200) in a state (P1) in which the cooling body (50) is fixed on the holding body (70), the fixing device includes an adhesive (300) for positionally fixing the engaging elements (100) and the opposing engaging elements (200) that are in an engaged state with each other, and each of the engaging elements (100) and the opposing engaging elements (200) constitutes one fixed pair (100a), and The fixing device includes at least three of the fixing pairs (100a), and the fixing pairs (100a) are arranged around the optical axis (A) of the projection optical system (60) at equal intervals from the optical axis (A) in a cross section perpendicular to the main radiation direction (X), the engaging element is configured as a rib portion (100) protruding from the holding body (70), the rib portion (100) extending along a predetermined extension plane (E) parallel to the main radiation direction (X) of the irradiation device (10) so as to move away from the holding body (70) in a direction opposite to the main radiation direction (X), and the rib portion (100) extends along a predetermined straight line (G) in a cross section perpendicular to the main radiation direction (X); The opposing engagement element is configured as a position fixing hole (200) corresponding to the protruding rib portion (100), and the position fixing hole (200) is arranged in the cooling body (50) and penetrates the cooling body (50) along a predetermined axis (X1) parallel to the main radiation direction (X), In a state (P1) in which the cooling body (50) is fixed on the holding body (70), the rib portion (100) of each of the fixed pairs (100a) is in an engaged state with the position fixing hole portion (200) so that the rib portion (100) passes through the corresponding position fixing hole portion (200) so that spatial volume portions (210) are formed between the rib portion (100) and the position fixing hole portion (200) on the mutually facing sides of the extension surface (E) of the rib portion (100), and the adhesive (300) for fixing the position of the rib portion (100) to the position fixing hole portion (200) is disposed within the spatial volume portions (210); An irradiation device characterized by:

2. the fixing device includes at least four of the fixing pairs (100a), and each of the two fixing pairs (100a) is arranged facing each other such that the rib portions (100) are arranged parallel to each other in a cross section perpendicular to the main radiation direction (X) in a state (P1) in which the cooling body (50) is fixed on the holding body (70), whereby an assumed virtual connection line (L) arranged perpendicular to each of the rib portions (100) intersects with the optical axis (A) of the projection optical system (60); The illumination device according to claim 1 ,

3. the imaginary connection lines (L) assumed between each of the two fixed pairs (100a) intersect each other at an angle of 90° in a cross section perpendicular to the main radiation direction (X); The illumination device according to claim 2 ,

4. the adhesive (300) being an adhesive that cures by UV radiation; The illumination device according to claim 1 ,

5. The adhesive (300) is disposed symmetrically with respect to the extension surface (E) within the spatial volume portion (210) for each of the fixed pairs (100a); The illumination device according to claim 1 ,

6. the spatial volume portion (210) formed between the rib portion (100) and the position fixing hole portion (200) on the opposing sides of the extension surface (E) of the rib portion (100) in a state (P1) in which the cooling body (50) is fixed on the holding body (70) is configured in the shape of a wedge-configured portion having a tapered end portion (220) in the direction of the main radiation direction (X) in a cross section perpendicular to the corresponding extension surface (E) for each fixed pair (100a), whereby the adhesive (300) disposed in the spatial volume portion (210) is similarly configured as a wedge-configured portion; The illumination device according to claim 1 ,

7. the position fixing hole (200) for each of the fixed pairs (100a) has a pull-out edge (230) which extends from the position fixing hole (200) into the spatial volume (210) and at least partially defines the tapered end (220) of the wedge configuration, whereby the adhesive (300) disposed in the spatial volume (210) and configured as the wedge configuration is secured against pull-out in the direction of the main radial direction (X); 7. The illumination device according to claim 6,

8. said rib portion (100) having a structured surface to provide an increased surface area for fixing in position with said adhesive (300); The illumination device according to claim 1 ,

9. A vehicle floodlight comprising at least one illumination device according to any one of claims 1 to 8.

Images