EP2672169B1 - Lighting device for a vehicle, in particular motor vehicle headlight - Google Patents

Description

The invention relates to a lighting device for a vehicle according to the preamble of claim 1.

The invention further relates to a light source and a reflector for a lighting device according to the invention.

Such a lighting device is of the generic type DE 102007 022 028 A1 known. As a light source, for example, an incandescent lamp or a gas discharge lamp can be used. The light source can be attached to the reflector in such a way that a glass bulb inserted through the opening at the back of the reflector into an interior of the reflector is positioned with the incandescent filament or with the arc in a defined position relative to a reflection surface of the reflector. This is consistent for generating Light distribution of the headlamp required.

From the DE 10 2007 022 028 A1 In particular, a lighting device for a vehicle is known, wherein for releasing and securing a light source to a reflector, a clamping element for fixing the light source is provided in the reflector. This clamping element is movable between an insertion position and an end position and acts in the end position, the light source in the direction of an outer periphery of the reflector opening. The clamping element is held captive by a spring tongue. Thus, the positioning of the light source in the DE 10 2007 022 028 A1 about a forced displacement of the light source in the opening of the reflector during the rotation of the light source. However, high demands on the tolerances of the individual components must be adhered to in all components to be used.

Other solutions look contrary to DE 10 2007 022 028 A1 no attachment with just one hand in front. For example, in the case of a possibility known from the prior art, a lamp mounting is arranged on the rear side of a reflector, to which a gas discharge lamp is fastened with its lamp base by means of a one-piece, rotatable ring. A rotational movement of the lamp does not take place. Rather, the lamp from the back of the reflector in the axial direction, substantially parallel to an optical axis of the reflector, inserted into this and fixed thereto by means of a rotary movement of a ring.

According to another known from the prior art possibility, a light source by means of a wire bow spring at a rear side of a reflector attached. A rotational movement of the light source does not take place. An attachment with only one hand is also not possible.

According to yet another possibility known from the prior art, the attachment of a light source to the reflector by means of a separate mounting plate. In this solution, the light source is inserted into a U-shaped recess of the sheet and fastened with screws on the reflector. This solution has a very low weight. A rotational movement of the light source does not take place. A change of the light source is possible with this solution only with the help of a tool.

From the DE 10 2009 032 461 A1 Finally, a device for mounting a lamp in a lighting device is known, wherein for fixing the lamp is provided on a outer surface of a lamp holder body and the outer surface in a closed curve encircling, deformable lamp carrier strip. By rotation of the lamp, this lamp carrier belt is moved on the outer surface. The lamp is thereby engaged radially behind a rotation and clamped axially on the lamp holder body.

In the present invention, inter alia, a spring is provided, which is biased in the mounting position against the spring force such that the light source is acted upon radially by the spring in the opening against the mounting portion. This makes it possible to fasten the light source while compensating for manufacturing tolerances or compensating for play in the radial direction in the reflector. Coding protrusions of the Carrier portion in the insertion position with coding recesses of the light source overlap or behind, wherein the Codiervorsprünge in the mounting position of the interference with the Codieraussparungen can be moved so that an axial removal of the light source can be prevented from the opening. The movement into the mounting position can advantageously be done by turning by a rotational angle β. The vote of the contact forces with which the light source is acted upon radially against the mounting portion can be adjusted by design of the spring to the particular application. The light source may advantageously be a gas discharge lamp.

In summary, therefore, the prior art no fastening device for a light source in a lighting device for a vehicle, in particular in a motor vehicle headlight, with a light source without high demands on the tolerances of the components to be used with a low number of components with only one hand in a defined position can be attached.

The present invention is therefore based on the object to further develop a lighting device of the type mentioned in that the light source can be fixed in a defined position in the reflector while compensating for manufacturing tolerances and a simple, secure and fast attachment of the light source is made possible on the reflector.

To solve this problem it is now proposed that the spring is arranged in such a way in a guide groove for guiding the spring that they move from a rest position into a Clamping position is movable. The spring can advantageously be arranged between the guide groove and the support section. This is particularly advantageous because the spring can not fall out when arranged in the guide groove of the mounting portion between the reflector and the support portion, as falling out of the spring can be prevented by the support portion. Thus, the spring is secured in position.

The coding recesses of the light source can be provided at a regular distance of 120 ° to the light source. Advantageously, however, the coding recesses are arranged at different distances at the light source, since otherwise the goal of encoding or coding of different light sources for different lighting devices can not be achieved.

In a further advantageous embodiment of the illumination device, the spring is provided such that it can be moved by turning the light source from the insertion position into the fastening position into its clamping position. The spring can be moved in the guide groove by a longitudinal displacement of the rest position in the clamping position.

Furthermore, it is advantageous if the guide groove is arranged to extend transversely to the longitudinal axis tangentially to the opening. By such an arrangement can be carried out in the tangential to the opening extending guide groove upon rotation of the light source, a superimposed longitudinal displacement of the spring.

It is particularly preferred in this case if the guide groove has two lateral surfaces running transversely to the longitudinal axis, at least in sections, parallel to a tangential plane of the opening. By these side surfaces can then be advantageously ensured on the one hand a guide of the spring in the longitudinal displacement. On the other hand, the spring can be supported on the side surfaces of the guide groove.

Advantageously, the spring is bow-shaped, wherein the spring of a joint portion has connected strap sections, wherein an upper strap portion rests in the rest position on the radially outer side surface and a lower strap portion rests against an obliquely to the radially inner side surface extending inclined surface. The spring can advantageously be arranged in the rest position under a bias between the radially outer side surface and the inclined surface in the guide groove. However, it is also conceivable to provide the inclined surface such that the spring can be arranged without force in the rest position in the guide groove. Thus, during the initial assembly of the spring in the guide groove, the axial insertion of the spring along the longitudinal axis can be facilitated by the inclined surface.

A further advantageous embodiment of the illumination device provides that a Engaging portion of the spring in the insertion between fixing portions of the light source is arranged such that the spring is displaced upon rotation of the light source tangentially to the opening in the guide groove in the clamping position. In the axial insertion of the light source, therefore, a Codiervorsprung, which is provided between two fixing portions, are pushed onto the engagement portion of the spring, that the Codiervorsprung engages around the engagement portion. Advantageously, thus a rotational movement of the light source can be implemented in the movement in the mounting position in a translational movement of the spring in the guide groove.

It is particularly preferred in this case if the fixing section engaging the engagement section during rotation of the light source has a pressure point radially on the outside which moves in a circular path during rotation and acts against the lower bracket section in such a way that the lower bracket section of the spring is biased against the upper bracket section, so that the light source is acted upon against the mounting portion. By the movement of the pressure point on a circular path during rotation of the light source, a superimposed movement of the pressure point can be achieved. The pressure point can be moved in the direction of the guide groove and in a direction transverse thereto.

Advantageously, the guide groove has a transverse to the two side surfaces stop portion such that the first bracket portion of the spring abuts in the clamping position on the stopper portion. Due to the positive connection between the engagement portion and the two engagement portions engaging in the insertion position Fixierabschnitten therefore not only the movement of the spring in the guide groove, but also the rotatory movement of the light source can be limited.

A further advantageous embodiment of the illumination device provides that the engagement portion of the spring extends in the rest position at least partially parallel to contact surfaces of the fixing. By the parallel course of the engagement portion can be prevented that when moving the light source from a disassembled position in the insertion position, i. when axially displacing the light source into the opening, the spring abuts with the contact surfaces of the fixing sections in such a way that undesirable jamming of the spring and the light source occurs.

It is particularly preferred if the engagement portion of the spring at a distance of 0.01 mm to 0.5 mm to the contact surfaces, preferably at a distance of 0.1 mm to the contact surfaces. The distance can be chosen so that on the one hand jamming of the light source when moving into the insertion position can be prevented. On the other hand, can be achieved with a sufficiently small selected distance, that the rotation stop of the light source can be realized by the positive connection with the spring by abutting the stop portion of the guide.

A particularly advantageous embodiment of the illumination device provides that the attachment portion in the opening has two flattened, parallel to tangent planes of the opening extending support surfaces for supporting the light source such that the light source is supported in the mounting position on the support surfaces. Thus, in a particularly advantageous manner, an attachment of the lamp in one defined location can be achieved by a three-point attachment in the opening. In this case, the light source can be supported both on the two flattened support surfaces, as well as the pressure point directly to the spring. A compensation of manufacturing tolerances can thus be achieved, wherein the light source can be fixed in the reflector simultaneously accurate position.

Furthermore, it is advantageous if the support section on the reflector by means of the attachment portion or on the support portion provided pins which engage in provided on the support portion or on the attachment portion pin recesses, is rotatably disposed.

Furthermore, it is advantageous if spring elements are arranged on the carrier section such that the spring elements act on the carrier section or the light source axially in the direction of the reflector. In this case, the spring elements can be supported on an ignitor of a gas discharge lamp or on the attachment portion of the reflector. The igniter may advantageously comprise electronics for controlling and / or regulating the gas discharge lamp. Preferably, three spring tongues may be provided, wherein the number of spring tongues may be dependent on the number of Codiervorsprünge or Codieraussparungen. By the spring elements or spring tongues further falling out or axial movement of the pins can be prevented from the pin recesses.

A further advantageous embodiment of the illumination device provides that on the support portion provided clamping portion of the coding projections the Apply fixing portions of the light source in the mounting position parallel to the longitudinal axis of the illumination device axially in the direction of the reflector. In this case, the position of the lamp can not be set only in the radial direction; by the interaction of the spring tongues with the Codiervorsprüngen, which act on the fixing, the position of the lamp can also be set in the axial direction.

Advantageously, the light source is movable into the mounting position by rotation through an angle β in the range of preferably 10 to 30 °, more preferably in the range of 15 to 25 ° and more preferably of 20 °.

A further advantageous embodiment of the illumination device provides that the Codiervorsprünge of the support portion are formed with Einführradien or insertion bevels to facilitate the movement of the light source from the disassembled position in the insertion position.

The object stated in the introduction is also achieved by a light source for a lighting device according to the invention, wherein the light source has fixing sections which are engaged behind by coding projections in the fixing position, a spring being encompassed by fixing sections of the light source in the insertion position such that a rotational movement of the light source in a longitudinal movement of the spring is implemented.

The object stated in the introduction is also achieved by a reflector for a lighting device according to the invention, wherein at the back of the Reflektors a mounting portion for a light source is provided with an opening for receiving at least a portion of the light source, wherein on the reflector a support portion is provided with Codiervorsprüngen and wherein a spring can be arranged in a guide groove of the mounting portion for guiding the spring, that the spring between a Resting position and a clamping position is movable.

Figur 1

ein Lichtmodul einer erfindungsgemäßen Beleuchtungseinrichtung in perspektivischer Ansicht von schräg vorne;

Figur 2a

eine Hinteransicht auf das Lichtmodul gemäß Figur 1, wobei sich die Lichtquelle in einer Einführlage befindet;

Figur 2b

eine Hinteransicht auf das Lichtmodul gemäß Figur 1 und 2a, wobei sich die Lichtquelle in einer Befestigungslage befindet;

Figur 3a

eine Seitenansicht von rechts auf einen Reflektor und eine Lichtquelle einer erfindungsgemäßen Beleuchtungseinrichtung gemäß Figur 1 in der Befestigungslage;

Figur 3b

eine Lichtquelle für eine erfindungsgemäße Beleuchtungseinrichtung in perspektivischer Ansicht;

Figur 4a

eine Schrägansicht des Reflektors mit einem Trägerabschnitt und der Lichtquelle aus Figur 3b im Schnitt entlang Linie A-A gemäß Figur 3a in der Einführlage;

Figur 4b

die Schrägansicht gemäß Figur 4a in der Befestigungslage;

Figur 5a

eine Draufsicht auf den Reflektor und die Lichtquelle im Schnitt entlang Linie A-A gemäß Figur 3a in der Einführlage;

Figur 5b

die Draufsicht gemäß Figur 5a in der Befestigungslage; und

Figur 6

einen vergrößerten Ausschnitt des Reflektors mit Lichtquelle gemäß Figur 5a in der Einführlage.

Further details and advantageous embodiments of the invention will become apparent from the following description with reference to which the embodiment of the invention shown in the figures is described and explained in more detail. Show it:

FIG. 1

a light module of a lighting device according to the invention in a perspective view obliquely from the front;

FIG. 2a

a rear view of the light module according to FIG. 1 , wherein the light source is in an insertion position;

FIG. 2b

a rear view of the light module according to FIG. 1 and 2a , wherein the light source is in a mounting position;

FIG. 3a

a side view from the right of a reflector and a light source of a lighting device according to the invention according to FIG. 1 in the attachment position;

FIG. 3b

a light source for a lighting device according to the invention in a perspective view;

FIG. 4a

an oblique view of the reflector with a support portion and the light source FIG. 3b in section along line AA according to FIG. 3a in the introductory situation;

FIG. 4b

the oblique view according to FIG. 4a in the attachment position;

FIG. 5a

a plan view of the reflector and the light source in section along line AA according to FIG. 3a in the introductory situation;

FIG. 5b

the top view according to FIG. 5a in the attachment position; and

FIG. 6

an enlarged section of the reflector with light source according to FIG. 5a in the introductory position.

In FIG. 1 a light module 10 of a motor vehicle headlight 12 according to the invention is shown. The light module 10 includes a reflector 14, which may be made of plastic or metal, for example, die-cast metal. In a production of plastic, a reflective coating is applied at least in the region of a reflection surface of the reflector 14. In a production of die-cast metal, the reflector 14 is first painted to obtain a smooth surface, in which case a reflective coating is applied. Part of the light source 16 is an ignitor 18 for igniting and maintaining an arc in a glass bulb 20. Such an ignitor 18 may further comprise electronics for controlling and / or regulating a gas discharge lamp contain. This igniter 18 is in particular rotationally fixed to the glass bulb 20 or to the lamp base formed as fixing portions 22 of the light source 16, which in the FIGS. 3b to 6 clearly visible, arranged. The arc generated in the glass bulb 20 of the light source 16 is preferably arranged in the region of a first focal point of the reflector 14.

For exact positioning of the light source 16 in the reflector 14, the light source 16 and the glass bulb 20 and in the FIGS. 3b to 6 Fixing sections 22 shown at least partially in a in the FIGS. 4a to 5b shown opening 24 inserted into a rear side of the reflector 14 and moved into a mounting position. In this mounting position is located in FIG. 1 shown light source or ignited in the glass bulb 20 arc exactly at the focal point of the reflector 14. The position of the light source 16 in the reflector 14 is exactly defined both in the axial and in the radial direction.

How out FIG. 1 becomes clear, a front light exit opening of the reflector 14 is partially covered by a diaphragm 26. This aperture 26 serves to produce an asymmetrical light pattern. On a front edge of the reflector 14 fastening means 28 are further arranged, which hold a projection lens 30 at a defined distance from the reflector 14. An upper edge of the diaphragm 26 is projected by the projection lens 30 during operation of the headlamp 12 on the road ahead of the motor vehicle. Asymmetrical here means that the range of the light distribution on the own traffic side (with right traffic on the right road side) is larger than on the opposite traffic side (with right traffic on the left hand side Side of the road). By folding the aperture 26, the distribution of the light emerging from the headlight 12 or the light module 10 can also be varied. In a particularly simple case can be switched between dipped beam and high beam. On the underside of the reflector 14 connecting means 32 are further provided for electrical contacting and a servomotor 34 for headlamp leveling or switching between dipped and high beam.

FIG. 2a shows the light module 10 off FIG. 1 in his back view. The fixing portions 22 and the glass bulb 20 of the light source 16 are already in the in the FIGS. 4a to 6 shown opening 24 introduced. The light source 16 is thus in the insertion position. In this insertion position, the light source 16 by an angle β, which extends between a center plane 36 of the light source 16 and a horizontally extending through the reflector 14 center plane 38, rotated. To finally fix the light source 16 in the reflector 14 or on the light module 10, the entire light source is rotated by just this angle β by 20 ° in the clockwise direction in the direction of the arrow 40.

In this in FIG. 2b In the mounting position, the light source 16 is positioned both in the axial and in the radial direction exactly in the reflector 14, so that the glass bulb 20 or in the glass bulb 20th ignited arc is located in a focal point of the reflector 14.

FIG. 3a shows a side view of a reflector 14th with a mounted in the reflector light source 16 in the mounting position. The light source 16 is introduced along a longitudinal axis 42 in the opening 24 of the reflector 14. The fixing portion 22 and the lamp base and the glass bulb 20 disappear in a mounting portion 44 of the reflector 14 and in the opening 24. In the in FIG. 3a mounting position shown is arranged between the light source 16 and the reflector 14 designed as a disk-shaped spring element support portion 46 which is part of the reflector.

This trained as a spring element support portion 46 is in FIG. 3b clearly visible. The disc-shaped support portion 46 points in FIG. 3b clearly visible spring tongues 48, which act in the mounting position on the one hand, the igniter 18 of the light source 16, and on the other hand, the mounting portion 44 of the reflector 14. By the support portion 46, the light source 16 and the reflector 14 are pushed away from each other in the axial direction, or the support portion 46 is acted upon by the spring tongues 48 of the ignitor 18 in the direction of the mounting portion 44 of the reflector 14. This results in a play-free attachment of the light source 16 in the longitudinal direction, ie along the longitudinal axis 42nd

The fixing portions 22 of the light source 16 are in FIG. 3b also clearly visible. Between the fixing portions 22 and the housing 50 of the ignitor 18, a circumferential annular groove 52 is provided. In addition, a plurality of coding recesses 54 are provided between the fixing sections 22. In the Codieraussparungen complementary thereto, provided on the reflector 14 and the support portion 46 Codiervorsprünge 62, which in the FIGS. 4a and 4b are introduced. The Codieraussparungen 54 are provided so that only those light sources 16, which are provided for the respective headlights 12, to be inserted into the reflector 14 of the headlamp 12. Light sources 16, which are provided for example for another vehicle model and therefore, for example, have a different performance class, can not be fixed in the reflector 14 of the headlight 12 due to the coding recesses 54. In one of the Codieraussparungen 54 is located in the FIGS. 4a to 6 illustrated spring element 68th

The attachment of the light source 16 in the reflector 14 and the movement of the light source 16 in the insertion position and the subsequent movement of the light source 16 in the mounting position by rotating the angle β is based on FIGS. 4a to 6 will be explained in more detail below. There, the light source 16 is in section along the line AA according to FIG. 3a shown, wherein in the FIGS. 5a to 6 the support portion 46 is not shown for reasons of clarity.

To insert the glass bulb 20 of the light source 16 and the fixing sections 22, the light source 16 along the arrow 56 in the in the FIGS. 4a and 4b shown opening 24 of the reflector 14 is moved into. On the mounting portion 44 of the reflector 14 of the disk-shaped support portion 46 is rotatably disposed with the spring tongues 48. The rotation is effected by pins 58 of the mounting portion 44, which engage in pin recesses 60 of the support portion 46. On the support portion 46 are 16 corresponding with the Codieraussparungen 54 of the light source Coding projections 62 are provided. For axial insertion of the light source 16 or the glass bulb 20 and the fixing portion 22 in the opening 24 thus the Codieraussparungen 54 and the Codiervorsprünge 62 must overlap.

When in FIGS. 4a and 4b shown carrier section 46 three Codiervorsprünge 62 are provided, which in the plan view according to the FIGS. 5a and 5b are designed rectangular. In addition, a further semicircular Codiervorsprung 62 is provided on the support portion 46. The distribution of the Codiervorsprünge 62 on the outer circumference of the support portion 46 and the Codieraussparungen 54 can be done arbitrarily depending on the encryption case. In the present distribution of Codiervorsprünge 62 of the support portion 46, this distribution also affects the arrangement of the pins 58. At locations where the distances between the coding projections 62 are greater, a plurality of pins 58 may be provided, whereas at locations where the distances between the coding projections 62 are less, under certain circumstances only one pin 58 may be provided.

Now, if the light source 16 or the glass bulb 20 and the fixing portions 22 of the light source 16 along the arrow 56 are inserted into the reflector 14 and are in the insertion, surrounds the Codieraussparung 64 as in FIG. 5a and FIG. 6 shown an engagement portion 66 of a spring element 68. The Codieraussparung 64 is thus positively connected in the insertion position with the engaging portion 66 of the spring member 68. This spring element 68 is arranged in a guide groove 70, which is provided in the attachment portion 44 of the reflector 14, between the attachment portion 44 and the support portion 46. This in FIGS. 5a to 6 shown guide groove 70 extends transversely to the longitudinal axis 42 tangentially to the opening 24. In the illustrated embodiment, the guide groove 70 also extends horizontally.

The spring element 68 is arranged so displaceable in the guide groove 70, that upon rotation of the light source 16 to the arrow 40, the spring element 68 is moved into the mounting position from a rest position into a clamping position. As in FIG. 6 shown, the guide groove 70 has two parallel to a tangent plane of the opening extending side surfaces 72,73. The spring element 68 embodied as a bow spring has bow sections 76, 78 connected by a joint section 74. The upper bracket portion 76 rests against the radially outer side surface 72. Whereas the lower bracket portion 78 rests against an inclined surface 80, which adjoins the radially inner side surface 73 at an angle of approximately 15 °. In the illustration according to FIG. 5a and FIG. 6 the light source 16 is in the insertion position, wherein the bow spring 68 is in the rest position. The spring element 68 is in the rest position in a relaxed state before or it is slightly biased between the radially outer side surface 72 and the inclined surface 80. Thus, during the initial installation of the illumination device 12, the spring element 68 can be introduced axially into the guide groove 70 in the guide groove 70 without problems due to the oblique surface 80.

The engaging portion 66 of the spring 68 is disposed in the Codieraussparung 64, that is, between two fixing portions 22 of the light source. In the insertion position of the light source 16, that is, when the spring element 68 is in the rest position, the engagement portion 66 extends at least in sections parallel to contact surfaces 82 of the him embracing fixing portions 22 at a distance of about 0.1mm. Due to this parallel course, a slight axial insertion of the light source 16 from a disassembled position into the insertion position can take place.

When in the FIGS. 4a . 5a and 6 in the opening 24 of the reflector inserted light source 16 is rotated along the arrow 40 by the angle β, the coding recesses 54 as in FIG. 4b can be clearly seen from the overlay with the Codiervorsprüngen 62 out. The light source 16 is thus moved in rotation by the angle β in the mounting position and is thus fixed in the reflector 14 like a bayonet. In the mounting position, the light source 16 is therefore as in FIG. 4b shown fixed in the axial direction against the mounting portion 44 of the reflector. This is done by clamping portions 84, which are formed by the Codiervorsprüngen 62. The coding projections 62 have insertion radii 86 at the transition from the coding projections 62 to the clamping sections 84. These Einführradien 86 serve to facilitate the insertion of the light source 16. In the mounting position, the clamping portions 84 engage behind the fixing portions 22 of the light source 16. They virtually engage in the annular groove 52 and act on the light source 16 in the direction of the reflector 14. By the spring tongues 48 of Carrier portion 46, the light source 16 and the reflector 14 are pushed away from each other in the axial direction, or the carrier portion 46 is acted upon by the spring tongues 48 of the ignitor 18 in the direction of the mounting portion 44 of the reflector 14. The light source 16 is therefore in the opening 24 in the longitudinal direction, that is attached without play along the longitudinal axis 42.

When turning by the angle β is like in the FIGS. 5a and 5b can be seen, the spring element 68 by rotating the light source 16 and the igniter 18 positively in the guide groove 70 in the direction of arrow 87 shifted. In this case, the spring element 68 is acted upon by a contact surface 82 of the Codieraussparung 64 forming fixing portions 22. The light source 16 can be rotated until the tip 88 of the spring element 68 abuts against the abutment portion 90 of the guide groove 70. The stop section 90 extends transversely to the two side surfaces 72, 73 of the guide groove 70. The stop section 90 prevents further displacement of the spring element 68 along the arrow 87. The positive coupling of the engagement portion 66 of the spring element 68 with the Codieraussparung 64 of the light source 16 thus also defines a rotation stop of the light source sixteenth

The light source 16 or the fixing section 22 which acts on the engagement section 66 during rotation has a pressure point 92 on its contact surface 82 radially on the outside. When turning the light source 16 in the mounting position, the pressure point 92 moves in a circular path. Thus, there is a superimposed movement of the pressure point in the direction of arrow 87, and transversely thereto in the direction of arrow 94. When turning the light source of the pressure point 92 comes into touching contact with the lower bracket portion 78 of the spring element 68. By the movement of the pressure point 92 in the direction of the arrow 94 then the lower bracket portion 78 is biased against the upper bracket portion 76 against the spring force.

In the in FIG. 5b and the FIGS. 2b and 4b shown mounting position is as a bow spring trained spring element 68 in the clamping position. The spring element 68 is deformed against its spring force and acts on the pressure point 92 of the Fixierabschnitts 22 and the light source 16 in the radial direction opposite to the arrow 94. The light source 16 is therefore arranged in the radial direction against two in the opening 24, flattened and parallel to tangent planes of the Opening 24 extending support surfaces 96 for supporting the light source 16 is applied.

By a so-called three-point attachment thus securing the light source 16 is ensured in a radially defined position in the reflector 14. The light source 16 is on the one hand via a pressure point 92 with the spring element 68 in contact and supported on the other hand on the two support surfaces 96 from. Thus, an accurate positioning of the light source 16 in the radial direction can be ensured. The attachment is relatively insensitive to tolerances due to the spring element 68. Height tolerances, which occur for example during production, can be compensated.

The light source 16 is consequently not only fixed axially by the clamping sections 84, which act in the fixing position against the fixing sections 22. In the radial direction, the light source 16 is also determined by the three-point attachment by means of the spring element 68. Thus, in the present illumination device 12, a secure, backlash-free attachment of the light source 16 in the reflector 14 while compensating for tolerances is possible.

Claims (14)

1. A lighting device (12) for a vehicle, in particular a motor vehicle headlight, having a reflector (14) for focusing the light emitted by a light source (16), wherein a fastening portion (44) for the light source (16) is provided on a back side of the reflector (14) and has an opening (24) for receiving at least one part of the light source (16), and wherein a supporting portion (46) with coding protrusions (62) is provided on the reflector (14) in such a way that the light source (16) can be inserted into the opening (24) into an insertion position along a longitudinal axis (42) of the reflector (14) and is movable by rotation in bayonetlike fashion into a fastening position, in which the coding protrusions (62) engage fixation portions (22) on the light source side, and wherein a spring (68) is provided, which in the fastening position is prestressed counter to the spring force in such a way that the light source (16) is radially acted upon by the spring (68) in the opening (24) against the fastening portion (44), characterized in that the spring (68) is located in such a way in a guide groove (70) for guiding the spring (68) that the spring is movable out of a position of repose into a clamping position.
2. The lighting device (12) of claim 1, characterized in that the spring (68) is designed such that by rotating the light source (16) from the insertion position into the fastening position the spring (68) is movable into its clamping position. (longitudinal motion)
3. The lighting device (12) of claim 1 or 2, characterized in that the guide groove (70) is located transversely to the longitudinal axis (42), extending at a tangent to the opening (24).
4. The lighting device (12) of one of claims 1 through 3, characterized in that the guide groove (70), transversely to the longitudinal axis (42), has two side faces (72, 73) extending at least partially parallel to a tangential plane of the opening (24).
5. The lighting device (12) of claim 4, characterized in that the spring (68) is embodied like a spring clip, and the spring (68) has spring clip portions (76, 78) that are connected by a link portion (74), and an upper spring clip portion (76), in the position of repose, rests on the radially outer side face (72), and a lower spring clip portion (78) rests on an oblique face (80), extending obliquely to the radially inner side face (73).
6. The lighting device (12) of one of claims 1 through 5, characterized in that an engagement portion (66) of the spring (68), in the insertion position, is located between fixation portions (22) of the light source (16) in such a way that the spring (68), upon rotation of the light source (16) tangentially to the opening (24) in the guide groove (70), is thrust into the clamping position.
7. The lighting device (12) of claim 6, characterized in that the fixation portion (22), which acts on the engagement portion (66) upon rotation of the light source (16), has a radially outer pressure point (92) which upon rotation moves along a circular path and acts counter to the lower spring clip portion (78) in such a way that the lower spring clip portion (78) of the spring (68) is prestressed against the upper spring clip portion (76), so that the light source (16) is acted upon counter to the fastening portion (44).
8. The lighting device (12) of one of claims 5 through 7, characterized in that the guide groove (70) has a stop portion (90), extending transversely to the two side faces (72, 73), such that the upper spring clip portion (76) of the spring (68), in the clamping position, strikes the stop portion (90).
9. The lighting device (12) of one of claims 6 through 8, characterized in that the engagement portion (66) of the spring (68) in the position of repose extends at least in some portions parallel to contact faces (82) of the fixation portions (22).
10. The lighting device (12) of claim 9, characterized in that the engagement portion (66) of the spring extends at a spacing of 0.01 mm to 0.5 mm from the contact faces (82), and preferably at a spacing of 0.1 mm to the contact faces (82).
11. The lighting device (12) of one of the foregoing claims, characterized in that the fastening portion (44) in the opening (24) has two flattened bracing faces (96), extending parallel to tangential planes of the opening (24), in such a way that in the securing position the light source (16) is braced on the bracing faces (96).
12. The lighting device (12) of one of the foregoing claims, characterized in that on the supporting portion (46), spring elements (48) are located in such a way that the spring elements (48) act upon the supporting portion (46) and/or the light source (16) axially in the direction of the reflector (14).
13. A light source (16) for a lighting device (12) of one of the foregoing claims, characterized in that the light source (16) has fixation portions (22), which in the securing position are engaged from behind by coding protrusions (62), and a spring (68) is embraced by fixation portions of the light source (16) in the insertion position, in such a way that a rotary motion of the light source (16) is converted into a longitudinal motion of the spring (68).
14. A reflector (14) for a lighting device (12) of one of claims 1 through 12, characterized in that on the back side of the reflector (14), a fastening portion (44) for a light source (16) is provided with an opening (24) for receiving at least a part of the light source (16), and on the reflector (14), a supporting portion (46) with coding protrusions (62) is provided, and a spring (68) can be located in such a way in a guide groove (70) of the fastening portion (44) for guiding the spring (68) that the spring (68) is movable between a position of repose and a clamping position.

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