DE102013200521A1 - Primary optical device for headlight (claimed) of motor vehicle, guides mixed light distribution to light exit surface via converging reflection surface of light guide portion to form primary light distribution - Google Patents

Abstract

The device (10) has photo luminescence element (26) that emits mixed light distribution (28) by hitting laser radiation (L) under radiation of photoluminescence. The laser radiation is radiated via radiating portion (18,19) onto photo luminescence element. The mixed light distribution is guided to light exit surface via converging reflection surface (16) of light guide portion (14) to form primary light distribution (34). A reflecting surface (24) is arranged such that the deflected mixed light distribution is reflected to collection-reflection surface (32). An independent claim is included for headlight of motor vehicle.

Description

The invention relates to a primary optics device for motor vehicle headlights with laser light source according to the preamble of claim 1, as well as a motor vehicle headlamp with laser light source according to the preamble of claim 10.

Laser light sources, in particular semiconductor lasers, offer a number of potentially advantageous properties, such as e.g. a comparatively small light-emitting surface, high radiation intensities, and the emission of largely collimated light bundles. Optical systems for laser light can therefore be realized with a small installation space, e.g. because smaller focal lengths can be selected than for optical systems for less collimated light beams of, for example, incandescent or conventional light emitting diodes (LEDs). The use of laser light source can therefore allow a compact design for motor vehicle headlights.

However, problems with the use of laser light sources for automotive headlights result from the fact that lasers emit substantially coherent, monochromatic light or light in a narrow wavelength range. For the radiated light of a motor vehicle headlamp but usually white mixed light is desired or required by law. In addition, the emission light distribution should usually have certain, sometimes prescribed by law intensity gradients. It is therefore necessary to take measures for the conversion into suitable light.

For converting monochromatic light into e.g. White mixed light is known in the field of white light-emitting diodes (LEDs) or luminescence conversion LEDs, the use of photoluminescent converters or photoluminescent elements. These have e.g. a photoluminescent dye in, for example, a semi-transparent substrate, and are disposed directly on the light-emitting portion of the LED. The light of a colored (e.g., blue) light emitting LED excites the photoluminescent dye for photoluminescence, whereby the photoluminescent dye itself emits light of a different wavelength (e.g., yellow). Thus, at least part of the irradiated light of one wavelength range can be converted into light of another wavelength range. As a rule, a further portion of the incident light is scattered by the photoluminescent element. The scattered light and the light emitted by photoluminescence can then be additively superimposed and the desired, e.g. achieve white mixed light.

When using the principle of photoluminescence conversion for motor vehicle headlamps with laser light source, the mixed light emitted by the photoluminescent element is generally not collimated, more diffuse and homogeneous in comparison to the incident laser beam. The photoluminescence element therefore distributes the energy of the laser light source over a large solid angle range. Thus, there is the possibility that a part of the light energy of the laser light source is lost after the conversion into mixed light and the advantageous characteristics of the laser light source are not fully usable and the efficiency is lowered.

In the US 2011/0148280 A1 is a motor vehicle headlamp described with a plurality of laser diodes as the light source. In the beam path after the laser diodes, a light-guiding element is arranged, which guides the laser beams which can be emitted by the laser diodes to a common light-emitting surface of the light-guiding element, through which a collective light beam can emerge from laser light. In the further beam path, a photoluminescence converter is arranged such that the collective light beam impinges on the photoluminescence converter and stimulates it to emit a mixed light distribution. The emitted mixed light is deflected by a secondary reflector in a Abstrahllichtverteilung the headlamp. The described headlamp does not have a primary optic element which serves to preform the mixed light produced into a primary light distribution.

The WO 2008/149265 A1 shows a collimator, by means of which the einstrahlbare light of a substantially monochromatic light source (eg colored LED) can be converted into eg white mixed light, which has a possible for use in automotive headlamps primary light distribution. The collimator has a light guide body with a light entrance window and a light exit surface and is further delimited by a reflective side surface. Immediately following the light entrance window, a luminescent layer with a photoluminescent dye is arranged. The mixed light which can be generated by the luminescence layer by irradiation of monochromatic light extends in the light guide body, is optionally deflected at its side surface to the light exit surface and exits through it from the collimator.

The invention has for its object to ensure efficient conversion of the light of laser light sources in mixed light and also to make the mixed light as efficient as possible for a motor vehicle headlight.

This object is achieved by a primary optics device according to claim 1, and by a motor vehicle headlamp according to claim 10.

The primary optics device according to claim 1 is used to obtain a primary light distribution from the light of at least one light source and comprises a photoluminescent element, which is designed such that by incidence of the laser radiation, a mixed light distribution can be emitted by utilizing photoluminescence. The emission of the mixed light takes place in particular by partial conversion of the irradiated laser light via photoluminescence and by partial (in particular diffuse and / or incoherent) scattering of the laser light at the photoluminescent element. It is also possible for substantially uninfluenced portions of the incident light (or, for example, only deflected or surfaces reflected at interfaces) to contribute to the formation of the mixed light. In this case, the converted light has a wavelength which differs from the wavelength of the irradiated laser light and can addively mix with the light scattered at the photoluminescent element to give, for example, white light. The photoluminescent element is preferably designed to generate a white mixed light distribution from the light of the laser light source.

The primary optics device further comprises a Einstrahlabschnitt, by which laser light can be irradiated to the photoluminescent element. In addition, a light guide body is provided for guiding the light of the mixed light distribution, wherein the light guide body has at least one light exit surface through which light can emerge to form a primary light distribution of the primary optics device. The light guide body is delimited by at least one collective reflection surface such that at least portions of the light of the mixed light distribution which runs in the light guide body are deflected to the light exit surface by the collecting reflection surface.

According to the invention, the primary optics device has a deflecting reflection surface which is embodied and arranged such that light of the mixed light distribution that can be emitted by the photoluminescence element is deflected by means of the deflecting reflection surface to the collecting reflection surface.

The deflecting reflection surface is arranged such that at least a portion of the mixed light distribution emitted by the photoluminescent element (by conversion and / or transmission and / or scattering of the irradiated laser beams) strikes the deflecting reflection surface before impinging on the collecting reflection surface. At least for this proportion of the mixed light distribution, first the deflecting reflection surface and then the collective reflection surface act successively. In this case, the collective reflection surface can be designed in such a way, in particular in such a way that a primary light distribution with the desired properties can emerge through the light exit surface. By suitable design of the collective reflection surface, the primary light distribution can be given, for example, a specific intensity profile or a specific boundary shape (for example, oval spot light distribution or light-dark boundary).

Preferably, the light guide body and / or the collective reflection surface is formed such that the primary light distribution is collimated starting from the light exit surface along a radiation direction, or converges. For certain applications, however, diverging properties may also be advantageous. The primary light distribution may then be in a motor vehicle headlight, e.g. be deflected or projected by means of a subsequent in the beam path secondary optics in the desired emission light distribution, for example, in the vehicle apron. In this respect, the collective reflection surface can have jet-forming properties. The collective reflection surface preferably substantially covers a complete half space around the photoluminescent element to efficiently utilize the emitted radiation.

The deflecting reflection surface can be configured such that the mixed light distribution emitted by the photoluminescent element reaches the collecting reflection surface as completely as possible and can be deflected by the latter into the primary light distribution. In particular, such light beams, which propagate away from the photoluminescence element in a direction away from the collective reflection surface, can be deflected by means of the deflection reflection surface to the collecting reflection surface. This can increase the efficiency of the headlamp.

The deflecting reflection surface can additionally have beam-shaping properties. It is conceivable, for example, that the deflecting reflection surface has a preferably straight boundary edge. This can e.g. a reflective trained area and a light absorbing area separated from each other. Additionally or alternatively, the photoluminescent element may also be delimited by a boundary edge, which preferably runs straight. The boundary edge of the deflecting reflection surface and / or of the photoluminescent element can be imaged on irradiation of laser light onto the photoluminescent element via the collecting reflection surface as a light-dark boundary.

In order to form the primary light distribution, the primary optics device can also have diaphragm means which are arranged in the beam path, for example, between the deflection reflection surface and the collective reflection surface or the collective reflection surface and the light exit surface. It can also at least one filter layer (in the sense of an optical filter) may be provided which is subsequently arranged, for example, on the deflecting reflection surface and / or on the photoluminescent element and / or on a further boundary surface of the optical waveguide.

For the proportion of the mixed light distribution that can be emitted by the photoluminescent element, which impinges on the deflecting reflection surface, the deflecting reflection surface is therefore arranged in the beam path after the photoluminescent element and in front of the collecting reflection surface. The light of the mixed light distribution emitted by the photoluminescent element can, after being deflected by the deflecting reflection surface, hit the photoluminescent element again or can be transmitted through it. The deflection reflecting surface preferably deflects light such that it extends in the light guide body to the collecting reflection surface.

When the primary optics device is supplied with a laser light source, the photoluminescence element acts insofar as the actual light source which emits the mixed light distribution and which feeds the primary light distribution. In order to achieve efficient use and to allow precise shaping of the primary light distribution through the collective reflection surface, e.g. the effective surface of the photoluminescent element should be sized as small as possible in comparison to the surface of the collective reflection surface.

It is conceivable that the light guide body comprises in particular in the beam path after the collective reflection surface at least one Lichtleitabschnitt which is bounded by side surfaces such that extending in the Lichtleitabschnitt light beams can be passed under total internal reflection to the light exit surface. Total internal reflection occurs at a side surface when a light beam striking the side surface forms an angle to the perpendicular on the side surface at the reflection point exceeding the critical angle of total reflection, so that the law of refraction (Snellius law) is not a real solution to the angle of refraction results. The at least one light guide section may be configured such that the mixed light distribution deflected by the collective reflection surface is transformed according to the (e.g., legal) requirements. By way of example, the light-guiding section can be set up to collimate or narrow the mixed light distribution radiating through it. For this purpose, the light guide section may have a cross-section widening along its course from the collective reflection surface to the light exit surface, i. it can be limited by diverging side surfaces.

According to an advantageous embodiment, the light guide body has a light coupling surface which forms the irradiation section of the primary optics device. The coupled by the light incidence surface light of a laser light source extends after coupling such in the light guide that it can meet the photoluminescent.

Preferably, the photoluminescent element is arranged on the light input surface. The photoluminescent element is then in particular partially transparent or semitransparent, so that the transmitted, possibly scattered light can additively mix with the converted via photoluminescence light to a particular white mixed light.

However, the laser light beam does not necessarily have to run in the optical waveguide before it hits the photoluminescent element. It is also conceivable that the light guide body has a transmission opening or Durchstrahlausnehmung, which forms the Einstrahlabschnitt the primary optics device. The photoluminescent element is then preferably arranged after the transmission opening in such a way that laser light can be radiated through the transmission opening onto the photoluminescent element. Such embodiments make it possible to cool the photoluminescent element independently of the light guide and thus to extend its life. For example, a heat sink can be arranged after the transmission opening, wherein the photo-light-emitting element is arranged on the heat sink. The light guide body preferably limits the transmission opening in a toroidal manner. However, it is also conceivable that the light guide body has a plurality of spaced-apart, for example sector-like body sections, which are arranged around a transmission opening.

For all embodiments of the invention, the collective reflection surface is preferably arranged on a section of the light guide body facing the laser light source during operation of the primary optics device, and the deflection reflection surface is arranged on a side of the light guide body remote from the primary optics device of the laser light source (at the light guide body or at a distance therefrom). The collective reflection surface can be arranged, for example, next to the irradiation section or surrounding it, and the deflecting reflection surface, for example, opposite the irradiation section. It is conceivable, in particular, that the collective reflection surface of the deflecting reflection surface is arranged opposite to a main irradiation direction extending from the irradiation section to the photoluminescent element (optionally offset radially outward with respect to the main emission direction). Due to the embodiments mentioned, an irradiated laser light beam, optionally after conversion at the photoluminescent element, thrown back once by the deflecting reflection surface in a substantially opposite direction to the main direction of irradiation and then directed by the collecting reflection surface to the light exit surface. This beam path makes it possible to realize a desired intensity distribution of the primary light distribution by suitably designing the deflecting reflection surface and / or the collective reflection surface and / or the light guide body.

The deflecting reflection surface can be arranged on the light guide body and limit it at least in sections, which leads to a compact overall structure. The deflecting reflection surface can be formed for example as a mirrored boundary surface of the light guide. It is also conceivable, however, for the deflecting reflection surface to be arranged on a component separate from the light guide body, as explained below by way of example.

The photoluminescent element can be arranged directly adjacent to the deflecting reflection surface, in particular gap-free. Preferably, the photoluminescent element lies flat against the deflecting reflection surface. Thus, the deflecting reflection surface for a transmitted portion of the laser light which can be irradiated onto the photoluminescent element is arranged in the beam path immediately following the photoluminescence element. If, for example, the deflecting reflection surface is arranged on the light guide body itself, then the photoluminescence element can be arranged on the deflecting reflection surface and integrated in the light guide body. For example, the photoluminescent element can then be realized by introducing a photoluminescent dye into a layer of the optical waveguide adjoining the deflecting reflection surface. However, it is also conceivable that the photoluminescent element is applied to the deflecting reflection surface, for example in the manner of a coating. Deviating from the above, however, the deflecting reflection surface can also be designed as a reflecting surface of a component separate from the light guide body, for example a heat sink.

The deflecting reflection surface can be designed in such a way that it bulges around the photoluminescent element, in particular in a trough-shaped manner. Preferably, the deflection reflecting surface is sized and arranged so as to substantially overlap a half-space (i.e., solid angle element of size nearly 2 x Pi) as viewed from the photoluminescent element. As a result, a large part of the light emitted by the photoluminescent element can be deflected and the efficiency can be increased.

The photoluminescent element may have a plate-like shape. However, a compact form, e.g. hemispherical, peg-shaped, cylindrical, frusto-conical or prism-like. In such forms, a deflecting reflection surface bulging around the squat photoluminescent element can be particularly advantageous. The entire primary optics device is preferably formed in one piece as a structural unit. In particular, it is conceivable that the deflecting reflection surface and the photoluminescent element are arranged on the light guide body, in particular in these are integrated. This configuration as a coherent component can enable a simple and cost-effective production and contribute to the construction of a compact headlamp unit.

According to an advantageous embodiment, a heat sink is provided, which is arranged in thermally conductive contact with the deflecting reflection surface. This is particularly advantageous when the photoluminescent element is arranged directly adjacent to the deflecting reflection surface. As a result, it can be avoided that the photoluminescence element and / or the deflecting reflection surface strongly heat up during operation of the primary optics device due to the incident laser radiation, which can lead to a shortening of the service life of these components. If the deflecting reflection surface is arranged on the light guide body and delimits it, then the heat sink may, for example, be integrally connected to the light guide body or may rest against it in a form-fitting manner.

The heat sink can have the deflecting reflection surface, which is provided, for example, by a reflective boundary surface of the heat sink. The photoluminescent element can then be arranged directly on the deflecting reflection surface of the heat sink. As a result, unwanted heating of the photoluminescent element is effectively avoided by the incident laser radiation and thus increases the life of the photoluminescent element.

The object stated in the introduction is also achieved by a motor vehicle headlamp which has at least one laser light source, in particular a laser diode, for emitting laser radiation. The headlamp further comprises at least one photoluminescent element which is designed and arranged in such a way that the laser radiation which can be emitted by the laser light source strikes the photoluminescent element and thus a mixed light distribution utilizing photoluminescence as described above can be emitted. The motor vehicle headlamp may also have a secondary optics device for converting a primary light distribution fed by the mixed light distribution into comprise a light beam distribution of the headlamp. The secondary optics device can be designed, for example, as a collective reflector and / or projection lens and / or combination of such components. At least one photoluminescent element of the headlamp is contained in a primary optics device according to the invention. During operation of the headlamp, the primary light distribution passes through the light exit surface of the primary optics device, which is optionally converted into the emission light distribution by means of a secondary optics device.

Depending on the field of application, the emission light distribution to be generated by the motor vehicle headlight should have certain characteristic intensity characteristics, which are generally prescribed by law. For example, a dimmed light distribution (dipped beam, fog light) with a characteristic light-dark boundary or a high-beam light distribution with spot-like illuminated areas may be desired. The desired emission light distribution is achieved in the headlight according to the invention in that the primary light distribution is converted into the emission light distribution by means of the secondary optics device. In this case, the primary light distribution may already have a desired intensity profile, for example a light-dark boundary, wherein this intensity profile is deflected via the secondary optics device into the emission light distribution.

With the embodiment according to the invention, a compact, powered by laser light sources vehicle headlights can be realized. Due to the primary optics device, the light of the at least one laser light source can be used efficiently to generate the primary light distribution.

Preferably, the motor vehicle headlamp comprises a plurality of laser light sources. It is conceivable that a plurality of laser light sources for irradiating laser light are arranged in a common primary optics device, d. H. such that they radiate into a common Einstrahlabschnitt a common primary optics device.

For a further embodiment, the headlight may also have a plurality of laser light sources, as well as a plurality of primary optics devices, wherein each primary optics device is assigned in each case at least one laser light source such that its laser light can be irradiated into the irradiation section. A compact and powerful headlamp can then be realized in particular by providing a common secondary optical device for the plurality of primary optics devices. The primary light distributions of the various primary optics devices are then converted by the common secondary optics device into a light beam distribution of the headlamp.

On the other hand, it is conceivable that a primary optics device of the headlamp has at least two different light exit surfaces through which at least two different regions of the primary light distribution can emerge. These separate areas of the primary light distribution can then be deflected by different secondary optics into the emission light distribution of the headlamp.

Further details and advantageous embodiments of the invention will become apparent from the following description, with reference to which the embodiments of the invention shown in the figures are described and explained in more detail.

Show it:

1 a primary optic device according to the invention in longitudinal section;

2 a further embodiment of a primary optic device according to the invention in longitudinal section;

3 a further embodiment of a primary optic device according to the invention in longitudinal section;

4 an embodiment of the primary optics according to the invention with Lichtleitabschnitten;

5 a motor vehicle headlight according to the invention.

In the following description and in the figures, the same reference numerals are used for identical or corresponding features.

The 1 shows a primary optic device 10 , which in longitudinal section parallel to a main direction of radiation 12 is shown. The primary optics facility 10 includes a light guide body 14 which consists of a transparent material suitable for light conduction and a light exit surface 16 having. Through the light exit surface 16 can in the light guide 14 guided light from the light guide 14 escape.

The light guide body 14 can be a toroidal body of revolution around the main direction of radiation 12 be educated ( 1 ). However, it is also conceivable that the light guide 14 consists of several, non-contiguous parts of the body, for example in the manner of sectors of a toroidal body of revolution.

In the example shown limits the light guide 14 a central transmission opening 18 , By this laser light beam L of one or more non-illustrated laser light sources through the light guide 14 be blasted through.

The primary optics facility 10 includes one of the light guide body 14 separate, thermally conductive component, which in the example shown as a heat sink 20 is trained. The heat sink 20 has one of the transmission opening 18 facing Einstrahloberfläche 22 on. This irradiation surface 22 can be formed as a reflective surface, for example, mirrored and forms a deflection reflecting surface 24 the primary optics facility 10 ,

The deflecting reflection surface 24 is of a layered photoluminescent element 26 covered, by means of which laser radiation in the manner described above in a mixed light distribution 28 can be converted (by photoluminescence and partial scattering). Through the transmission opening 18 can laser beams on the photoluminescent element 26 be irradiated. The transmission opening 18 thus forms a Einstrahlabschnitt 19 the primary optics facility 10 ,

The light guide body 14 is further from a mixed light entrance surface 30 , as well as a collective reflection surface 32 limited. The collective reflection surface 32 is formed such that in the light guide body 14 extending light rays by reflection at the collective reflection surface 32 in the direction of the light exit surface 16 can be redirected. For this purpose, the collective reflection surface 32 be formed mirrored. The collective reflection surface 32 However, it can also be configured such that the light beams of the mixed light distribution in the light guide body 14 Total reflection occurs. The collective reflection surface 32 For example, it extends substantially from the Einstrahlabschnitt 19 up to the light exit surface 16 ,

The mixed light entry surface 30 limits the light guide body 14 on the collective reflection surface 32 with respect to the main irradiation direction 12 opposite side. The deflecting reflection surface 24 and the mixed light entrance surface 30 are aligned with each other such that at the deflecting reflection surface 24 reflected light beams of mixed light distribution 28 (As well as light rays, which from the at the deflecting reflection surface 24 arranged photoluminescent element 26 go out), through the mixed light entry surface 30 in the light guide body 14 enter and onto the collective reflection surface 32 to meet.

About the collective reflection surface 32 is the in the light guide 14 guided mixed light distribution 28 then into one through the light exit surface 16 passing primary light distribution 34 reshaped.

When used in a motor vehicle headlight, the primary light distribution 34 be converted for example via a secondary optics not shown in a desired Abstrahllichtverteilung the headlamp.

The Einstrahlabschnitt 19 can, unlike the primary optic device 10 , Also from a light input surface of the light guide 14 be formed. This is for example the primary optics device 40 according to 2 the case. This has a substantially disk-like light guide 14 on. The light guide body 14 may in turn be designed as a rotational body (around the in 2 indicated by dashed line main radiation direction 12 ), or comprise one or more separate sections of such a rotary body.

The light guide body 14 is from a light input surface 42 limited by which laser beams L of one or more non-illustrated laser light sources in the light guide 14 can be irradiated.

On his the light coupling surface 42 with respect to the main irradiation direction 12 opposite side is the light guide 14 from a deflection reflecting surface 44 limited. This runs in the direction of the light coupling surface 42 conical or prismatic together. The deflecting reflection surface 44 is reflective. Due to the cone-like configuration, light rays, which through the Lichteinkoppelfläche 42 in the light guide body 14 be coupled and in this to Umlenkreflexionsfläche 44 run when reflected at the deflecting reflection surface 44 a direction component opposite to the main direction of radiation 12 and obtained radially outward.

The light guide body 14 In turn, in turn, is formed by the reflective (or totally reflective) bulk reflection surface 32 limited. In the example shown, the collective reflection surface joins the light input surface 42 and extends to the light exit surface 16 of the light guide body 14 , The light exit surface 16 limits the light guide body 14 on the light input surface 42 with respect to the main irradiation direction 12 opposite side. The light exit surface 16 closes in the example shown to the deflecting reflection surface 44 of the light guide body 14 and surrounds these.

The deflecting reflection surface 44 is at the photoluminescent element 40 from a layered photoluminescent element 26 covered. This is therefore in the light guide 14 integrated, for example, characterized in that pigments of a photoluminescent dye in the material of the light guide 14 are introduced.

Through the light coupling surface 42 Thus, laser beams L can be applied to the photoluminescent element 26 be irradiated, whereby this for delivering a in the light guide 14 extending mixed light distribution 28 is stimulated. The light input surface 42 thus forms the Einstrahlabschnitt 19 the primary optics facility 40 ,

Since that in the light guide 14 integrated photoluminescent element 26 from the reflective deflection reflecting surface 44 is deposited, a portion of the of the photoluminescent element 16 emitted mixed light by reflection at the deflecting reflection surface 44 to the collective reflection surface 32 diverted. Another portion of the light produced by photoluminescence propagates from the photoluminescent element 26 through the light guide 14 directly to the collective reflection surface 32 out.

The mixed light distribution 28 is from the collective reflection surface 32 to the light exit surface 16 deflected and passes through this as a primary light distribution 34 from the primary optics facility 40 out.

Seen from the outside, the light guide body 14 the primary optics facility 40 one of the deflection reflecting surface 44 limited, conical or prismatic recess on. In this conical recess can for further embodiment, a heat sink 20 be arranged from a thermally conductive material, preferably such that the heat sink 20 over the deflecting reflection surface 44 with the photoluminescent element 26 is in thermally conductive contact.

The 3 shows another primary optic device 50 , The light guide body 14 this primary optics facility 50 essentially has one of the primary optics device 40 corresponding outer contour, in particular he is from the Einstrahlabschnitt 19 limited forming light input surface, as well as one of the light input surface 42 with respect to the main irradiation direction 12 opposite deflecting reflection surface 44 , This in turn is conical or prism-shaped and runs in the direction of the light coupling surface 42 to a cone top or prism edge together. As a result, light rays, which starting from the light coupling surface 42 on the deflecting reflection surface 44 impinge, to the collective reflection surface 32 be deflected, which the deflecting reflection surface 44 with respect to the main irradiation direction 12 is opposite and arranged offset radially outward. About the collective reflection surface 32 can light rays to the light exit surface 16 be steered.

At the primary optics facility 50 is the photoluminescent element 26 not at the deflecting reflection surface 44 , but directly to the light coupling surface 42 subsequently arranged. It is conceivable that the photoluminescent element 26 layered in the interior of the light guide 14 to the light guide body 14 outwardly limiting light input surface 42 fitting is designed.

On the other hand, it is conceivable that the photoluminescent element 26 is disc-like and formed on the outside of the light guide 14 directly to the light coupling surface 42 is arranged adjacent.

In any case, the photoluminescent element 26 in the embodiments mentioned in the Einstrahlabschnitt 19 arranged by irradiating laser light beams L on the Einstrahlabschnitt 19 the photoluminescent element 26 for delivery of the mixed light distribution 28 can be stimulated.

The photoluminescent element 26 In particular, it is semitransparent, so that part of the laser beams L saved is transmitted, and another part is used to emit light of a wavelength different from the laser beams by means of photoluminescence.

Is the photoluminescent element 26 at the light input surface 42 arranged so spreads the mixed light distribution 28 to the deflecting reflection surface 44 from this becomes the collective reflection surface 32 deflected and through this finally to the light exit surface 16 directed.

For further embodiment, the photoluminescent element 26 inside the light guide 14 immediately after the light coupling surface 42 arranged. Here is the light input surface 42 is preferably provided with a transmissive for the wavelength of the irradiated laser light reflection coating, which is reflective in particular for light with the wavelength can be generated by the photoluminescence. This prevents that from the photoluminescent element 26 in light of a deviating from the laser light wavelength converted proportion of the mixed light distribution 28 at least partially through the light input surface 42 from the light guide body 14 exit.

For a further embodiment of a primary optics device according to the invention, in the beam path after the collective reflection surface 32 a light guide section 62 for guiding the mixed light distribution 28 connect (see. 4 ). The light guide section 62 can be integral with the light guide 14 be connected, for example, such that in one of the light guide body described above 14 over its light exit surface 16 a one-piece transition to the Lichtleitabschnitt 62 he follows. The light guide section 62 is preferably of side walls 64 limited, which in the direction starting from the collective reflection surface 32 or the light exit surface 16 (via which the connection to the light guide body 14 takes place) to a light exit surface 16a of the light guide section 62 converge. In this respect, in this embodiment, the effective for the light pipe cross section of the Lichtleitabschnitts tapers 62 in the direction of the beam path from the collective reflection surface 32 to the light exit surface 16a , Advantageously, however, can also be an expanding cross-section, the side surfaces diverge.

However, it is also conceivable embodiment as for the Lichtleitabschnitt 66 , which, if necessary, beside sidewalls 64 , at least one further reflection surface 68 having. In such an embodiment, the mixed light distribution 28 after deflection through the collective reflection surface 32 and propagation into the light guide section 66 at the further reflection surface 68 be redirected, and through a light exit surface 16b of the light guide section 66 as a primary partial light distribution 34b escape. In general, it can be in the beam path to the collective reflection surface 32 subsequent light guide section 66 have a further reflection surface such that for the primary (part) light distribution 34b a desired preferred direction can be specified. It is conceivable in particular that at least two different Lichtleitabschnitte 62 . 66 are provided, which each have a light exit surface 16a . 16b have, by which deviating primary light distributions 34a . 34b can escape. Each of the primary light distributions 34a . 34b For example, in the further course, it can be converted into different regions of a light emission distribution via different secondary optics (not shown).

The 5 shows a motor vehicle headlamp with a plurality of laser light sources 102 to 102b , There are also two primary optics 104 . 106 provided, which may be formed, for example in the manner of the embodiments described above. The primary optics facilities 104 . 106 downstream of the beam path is a secondary optics device 108 provided, which is formed in the illustrated example as a projection lens. For example, a reflector is also conceivable. This can be done by the primary optics 104 . 106 in the region of a focal point of the secondary optics device 108 an intermediate image can be defined. In the area of the focal point, a, for example, movable, aperture can be arranged.

In the car headlight 100 Each two laser light sources are assigned to a primary optics device and feed their primary light distribution 34 respectively. 34 ' , Both primary light distributions 34 . 34 ' be through the common secondary optics facility 108 in a light beam distribution 110 of the car headlight 100 projected, with the emission light distribution 110 in the example shown, a main emission direction 112 of the car headlight 100 is concentrated.

The first primary optics facility 104 is the laser light sources 102 and 102b assigned such that these laser light sources through the Einstrahlabschnitt 19 (Depending on the design Durchstrahlöffnung 18 or light coupling surface 42 ) Irradiate laser light, which in the manner described by means of photoluminescence in a mixed light distribution and then in the primary light distribution 34 the primary optics facility 104 is converted. Correspondingly, the laser light sources 102c and 102d the further primary optics device 106 assigned, and feed their primary light distribution 34 ' ,

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2011/0148280 A1 [0006]
• WO 2008/149265 A1 [0007]

Claims (10)

Primary optic device ( 10 . 40 . 50 ) for motor vehicle headlights with at least one laser light source, - with a photoluminescent element ( 26 ), which is designed such that by incident laser radiation (L) a mixed light distribution ( 28 ) can be emitted using photoluminescence, - with a Einstrahlabschnitt ( 19 ; 18 . 42 ), by which laser light (L) on the photoluminescent element ( 26 ) is einstrahlbar, - one with a light exit surface ( 16 ) having light guide body ( 14 ) for directing the light of the mixed light distribution to the light exit surface ( 16 ), through which light to form a primary light distribution ( 34 ), wherein the light guide body ( 14 ) of at least one collective reflection surface ( 32 ) is limited such that light of the mixed light distribution ( 28 ), which in the light guide body ( 14 ), to the light exit surface ( 16 ) is deflected, characterized in that a deflecting reflection surface ( 24 . 44 ), which is designed and arranged such that light from the photoluminescent element ( 26 ) can be emitted mixed light distribution ( 28 ) by means of the deflecting reflection surface ( 24 . 44 ) to the collective reflection surface ( 32 ) is deflectable. Device according to claim 1, characterized in that the light guide body ( 14 ) a light input surface ( 42 ), which the Einstrahlabschnitt ( 19 ). Device according to claim 1 or 2, characterized in that the photoluminescent element ( 26 ) at the light input surface ( 42 ) is arranged. Device according to claim 1, characterized in that the light guide body ( 14 ) a Durchstrahlöffnung ( 18 ) or Durchstrahlausnehmung which the Einstrahlabschnitt ( 19 ). Device according to one of the preceding claims, characterized in that the collective reflection surface ( 32 ) on a in the operation of the primary optics device of the laser light source facing portion of the light guide body ( 14 ) is arranged, and the deflecting reflection surface ( 44 . 24 ) is arranged on a side remote from the operation of the primary optics device of the laser light source side. Device according to one of the preceding claims, characterized in that the deflecting reflection surface ( 44 ) on the light guide body ( 14 ) is arranged and limits this at least in sections. Device according to one of the preceding claims, characterized in that the photoluminescent element ( 26 ) at the deflecting reflection surface ( 24 . 44 ), in particular just fitting, is arranged. Device according to one of the preceding claims, characterized in that a heat sink ( 20 ) is provided, which in thermally conductive contact with the Umlenkreflexionsfläche ( 24 . 44 ) stands. Device according to claim 8, characterized in that the heat sink ( 20 ) the deflecting reflection surface ( 24 ) and the photoluminescent element ( 26 ) at the deflecting reflection surface ( 24 ) is arranged. Car headlights ( 100 ) - with at least one laser light source ( 102 . 102b . 102c . 102d ) for emitting laser radiation; With at least one photoluminescent element ( 26 ), which is designed and arranged such that from the laser light source ( 102 . 102b . 102c . 102d ) deliverable laser radiation (L) to the photoluminescent element ( 26 ) and thereby a mixed light distribution ( 28 ) can be emitted using photoluminescence; - and with a secondary optics facility ( 108 ) for forming one of the mixed light distribution ( 28 ) fed primary light distribution ( 34 . 34 ' ) in a light beam distribution ( 110 ) of the vehicle headlight ( 100 ), characterized by the at least one photoluminescent element ( 26 ) comprehensive primary optic facility ( 104 ) according to one of claims 1 to 9 for attaining the primary light distribution ( 34 . 34 ' ).

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