WO2018046319A1

WO2018046319A1 - Illumination device

Info

Publication number: WO2018046319A1
Application number: PCT/EP2017/071455
Authority: WO
Inventors: Oliver Woisetschlaeger; Frank Buchmann; Marcus Baumgart; Andreas Tortschanoff; Klaus-Peter Knorr
Original assignee: Osram Gmbh
Priority date: 2016-09-07
Filing date: 2017-08-25
Publication date: 2018-03-15
Also published as: DE102016217008A1

Abstract

The invention relates to an illumination device (1) comprising a semiconductor laser unit (30) that is designed to generate multiple laser light bundles (11 to 16), and comprising at least one light wavelength conversion element (9) that is designed to convert light of the laser light bundles (11 to 16) at least partially into light of another wavelength, as well as comprising an optic that is designed to direct the laser light bundles (11 to 16) onto a surface (90) of the at least one light wavelength conversion element (9), wherein the optic has at least one mirror element (8) which can swivel about at least one axis (80), and which is designed to guide the laser light bundles (11 to 16) over at least one surface section of the surface (90) of the at least one light wavelength conversion element (9), and wherein the optic comprises means (7, 41 to 46, 51 to 56, 70) for adjusting a divergence of the laser light bundle (11 to 16) along a slow axis (SA) and/or a fast axis (FA) of the laser light bundle (11 to 16) on the surface section of the surface (90) of the at least one light wavelength conversion element (9), as well as means for the homogenisation of the illumination in light flecks (L11, L12, L13, L14, L15, L16), which are generated by the laser light bundles (11 to 16) on the surface section of the surface (90) of the at least one light wavelength conversion element (9).

Description

LIGHTING DEVICE

Technical area

The invention relates to a lighting device with a semiconductor laser device which is designed to generate a plurality of laser light beams, and with at least one light wavelength conversion element which is designed to convert light of the laser light beam proportionally into light of a different wavelength, such that light from at least one light wavelength conversion element which is a mixture of non-wavelength-converted laser light and wavelength-converted light. Preferably, the semiconductor laser device and the at least one light wavelength conversion element are matched to one another such that the mixture of non-wavelength-converted laser light and wavelength-converted light yields white light. The illumination device serves, for example, as a light source for a motor vehicle headlight.

Presentation of the invention

In illumination devices equipped with a semiconductor laser device, the laser light beams generated by the semiconductor laser device may have a directional degree of divergence, which causes problems in producing a desired light distribution. The direction-dependent widening or divergence of a laser light beam is recorded using the terms slow-axis and fast-axis. In a plane perpendicular to the propagation direction of the laser light bundle, the term slow axis denotes the direction of minimum divergence of the laser light bundle and the term fast axis denotes the direction of maximum divergence of the laser light beam. The divergence of a laser light beam is given by means of two, usually different divergence angles for the fast axis and the slow axis. The divergence angle for the fast axis or slow axis denotes in a longitudinal section through the laser light beam, which is guided along the fast axis or slow axis, the from the peripheral rays of the laser light beam included angle. The shape and size of a laser spot which a laser light beam generates on the surface of a screen or of a light wavelength conversion element is therefore dependent on the original profile of the laser light beam immediately after leaving the semiconductor laser device and on the length of the path the laser light beam has traveled between the semiconductor laser device and the screen or a light wavelength conversion element.

It is an object of the present invention to provide a lighting device with a laser light beam generating a plurality of semiconductor laser device and having at least one light wavelength conversion element, which allows improved adjustment, alignment or or and shaping the laser light beam on a surface of the at least one light wavelength conversion element. This object is achieved by a lighting device with the features of claim 1. Particularly advantageous embodiments of the invention are set forth in the dependent claims.

The illumination device according to the invention has a semiconductor laser device which is designed to generate a plurality of laser light beams, and at least one light wavelength conversion element which is configured to convert light of the laser light beams at least partially into light of a different wavelength, and an optical system which is designed to project the laser light beams onto a surface the optics has at least one mirror element which is pivotable about at least one axis and which is designed to guide the laser light bundles over at least one surface section of the surface of the at least one light wavelength conversion element, and wherein the optics comprise means for adjusting an expansion or Divergence of the laser light bundles along a slow axis or and along a fast axis of the laser light bundles on the surface portion of the surface of the mini- at least one light wavelength conversion element and means for homogenizing the illumination in light spots or laser spots, which are generated by the laser light beams on the surface portion of the surface of the at least one light wavelength conversion element comprises.

As a result, a precise alignment of the laser light bundles relative to one another on the surface of the at least one light wavelength conversion element can be ensured and a more homogeneous illumination in light spots or laser spots generated by the laser light bundles on the surface portion of the surface of the at least one light wavelength conversion element can be achieved. In particular, the laser spot size and the laser spot shape as well as the arrangement of each laser light beam on the surface section of the at least one light wavelength conversion element can thereby be adjusted or adjusted and the illumination or illuminance within the respective laser spot can be homogenized.

Advantageously, the optics and the semiconductor laser device of the illumination device according to the invention are designed such that the laser light bundles are each guided parallel to a scanning direction over a surface portion of the surface of the at least one Lichtwellenlängenkonversi- onselements, and the means for homogenizing the illumination in light spots, the Laser light beams generated on the surface portion of the surface of the at least one light wavelength conversion element are advantageously designed such that the illumination in the light spots is homogenized at least along an axis perpendicular to the scanning direction.

Thereby, a surface portion or the entire surface of the at least one light wavelength conversion element can be scanned line by line or column by laser light and a desired light distribution can be generated. In particular, the laser light bundles can Simultaneously guided over the surface of the at least one light wavelength conversion element of the at least one mirror element and thereby scanned a plurality of rows or columns of the surface portion simultaneously with laser light. In addition, during line-wise or column-wise scanning of the surface of the at least one light wavelength conversion element, a light distribution on the surface of the at least one light wavelength conversion element can be varied by temporarily switching off or dimming or excessively high operating current levels of individual or all laser light sources of the semiconductor laser device. In addition, a uniform illumination or illuminance in the light spots or laser spots perpendicular to the scanning direction or scanning direction can thereby be achieved.

Preferably, the means for homogenizing the illumination in light spots, which become of the laser light bundles on the surface portion of the surface of the at least one light wavelength conversion element, an optical component comprising a plurality of transparent plates, which are arranged along an axis perpendicular to its plate plane, each between two adjacent transparent plates, a separation means is arranged, which allows total reflection of light in the transparent plates at the interfaces of the transparent plates to the respective separating means. The optical component of the illumination device according to the invention, which is also referred to below as an optical homogenizer, is further arranged such that the plate planes of the transparent plates are aligned parallel to the scanning direction.

Due to the aforementioned features of the optical component of the illumination device according to the invention are laser light bundles which impinge on a non-parallel, preferably perpendicular to the plane of the plate extending end face of the transparent plates, coupled into the respective plate and by multiple reflection at the interfaces to the separation means one of the front side opposite Lichtauskoppelseite the respective transparent plate directed to be decoupled there again from the plate. As a result of the aforementioned multiple reflection of the laser light bundles, the illumination or illuminance within light spots or laser spots produced by the laser light bundles on a screen downstream of the optical component in the light beam path is along an axis parallel to the direction of stacking of the transparent plates or perpendicular to the plate plane, homogenized.

The abovementioned optical component of the illumination device according to the invention preferably has a light outcoupling surface, which is oriented not parallel to the plate plane of its transparent plates and on which the at least one light wavelength conversion element is arranged. The light output surface of the optical component is formed by the light outcoupling surfaces of the individual transparent plates of the optical component. The aforementioned arrangement of the at least one light wavelength conversion element enables a precise line-by-line scanning of a surface section or the entire surface of the at least one light wavelength conversion element with a plurality of laser light bundles. In particular, an adjustment of the dimensions of the laser beam generated on the surface portion of the surface of the at least one light wavelength conversion element laser spot and the distances between the laser spots perpendicular to the scanning possible and homogeneous illumination or uniform illuminance perpendicular to the scanning direction in the of the laser light bundles on the laser laser spot generated on the surface portion of the surface of the at least one light wavelength conversion element.

For the above-mentioned purpose and for the separation of the individual laser light bundles, the optics and the at least one mirror element, which is pivotable about at least one axis, of the illumination device according to the invention are preferably designed such that the laser light bundles each extend in only one of the transparent plates of the optical component are coupled. In particular, it is also possible to set very small distances perpendicular to the scanning direction between the laser spots.

Advantageously, the light wavelength conversion element is arranged directly on the light exit surface of the optical homogenizer. As a result, the dimensions of the laser spots generated on the light wavelength conversion element perpendicular to the plane of the transparent plates of the optical homogenizer over the thickness of the transparent plates and the distances between the laser spots perpendicular to the plate plane over the distances between the transparent plates of the optical homogenizer to desired Values are set.

The means for adjusting a divergence or widening of the laser light bundles along a slow axis and / or a fast axis of the laser light bundles are preferably formed on the surface portion of the surface of the at least one light wavelength conversion element such that the divergence or widening of the laser light bundles Laser light beam is adjusted perpendicular to the scanning direction or adjusted to ensure a very precise adjustment of the alignment of the laser light beam relative to each other and the laser spots caused by them on the surface portion of the surface of the at least one light wavelength conversion element. For the aforementioned purpose, the optics and the semiconductor laser device are particularly preferably designed such that the slow axis of the laser light bundles is arranged on the surface section of the surface of the at least one light wavelength conversion element in each case perpendicular to the scanning direction.

The means for adjusting a divergence of the laser light bundles along a slow axis and / or a fast axis of the laser light bundles on the surface portion of the surface of the at least one light wavelength conversion element advantageously have at least one pinhole device for beam shaping of the laser light bundles. Preferably The Lochwellvornchtung for each laser light bundle on a pinhole to form each laser light bundle. In particular, it is ensured by means of the pinhole diaphragm device or the pinhole diaphragms that edge regions of the laser light bundles are faded out, which cause stray light and which would over-irradiate at least one mirror element which can be pivoted about at least one axis.

Advantageously, the means for adjusting a divergence or expansion of the laser light bundles along a slow axis and / or a fast axis of the laser light bundles on the surface portion of the surface of the at least one light wavelength conversion element comprise at least a first cylindrical lens for focusing the laser light bundles along their slow axis , The at least one first cylindrical lens makes it possible to adjust the laser spots of the laser light bundles on the mirror surface of the pivotable mirror element and thus also on the light coupling surface of the optical homogenizer in the direction of its slow axis. The at least one first cylindrical lens is preferably designed as a plano-convex cylindrical lens whose convex curvature runs in the direction of the slow axis of the laser light bundles.

The means for adjusting a divergence of the laser light bundles along a slow axis and / or a fast axis of the laser light bundles on the surface portion of the surface of the at least one light wavelength conversion element advantageously comprise at least one aspherical optical element for adjusting the laser light bundles along their fast axis , The at least one aspherical optical element has the further advantage that it additionally acts focusing on the laser light bundles along the slow axis.

The optics and the semiconductor laser device of the illumination device according to the invention are preferably designed such that the fast axis of the laser light beam on the surface section of the at least one NEN light wavelength conversion element is arranged in each case parallel to the scanning direction.

Advantageously, the means for adjusting a divergence of the laser light bundles along a slow axis and / or a fast axis of the laser light bundles on the surface portion of the surface of the at least one light wavelength conversion element comprise at least one second cylindrical lens for adjusting the divergence or widening of at least one laser light bundle along the fast axis in the light beam path at least one laser light beam is arranged. The at least one second cylindrical lens is preferably designed as a plano-concave cylindrical lens in order to achieve an adjustment of the widening of the laser light bundles parallel to the fast axis. Preferably, the concave curvature of the at least one plano-concave cylindrical lens runs in the direction of the fast axis of the laser light bundles, so that the effect of the plano-concave cylindrical lenses is limited to the divergence of the laser light bundles along the fast axis, and in particular not along the divergence the slow axis extends.

The semiconductor laser device of the illumination device according to the invention advantageously has a plurality of laser diodes, each of which is designed to generate blue laser light during its operation, and the at least one light wavelength conversion element of the illumination device according to the invention is preferably designed to convert blue laser light proportionately into light of different wavelength, so that is emitted from the at least one light wavelength conversion element white light, which is a mixture of non-wavelength-converted blue laser light and at least one light wavelength conversion element wavelength-converted light. Thereby, a light source for white light with very high luminance and light intensity can be created, which is particularly advantageous for projection applications, such as a light source for a motor vehicle headlight. Such an illumination The processing device is also referred to as a laser-activated remote phosphor illumination device or as a LARP illumination device, where the abbreviation LARP stands for laser-activated remote phosphor.

The illumination device according to the invention is preferably designed as a component of a motor vehicle headlight or as a motor vehicle headlight. In particular, light distributions for a motor vehicle headlight can be generated with the aid of the illumination device according to the invention. In general, a motor vehicle may be an aircraft or a waterborne vehicle or a land vehicle. The land-based vehicle may be a motor vehicle or a rail vehicle or a bicycle. Particularly preferred is the use of the vehicle headlight in a truck or passenger car or motorcycle.

Other applications are in headlamps or or and in lights for stage and effect lighting, outdoor lighting, room lighting or general lighting.

Brief description of the drawings

The invention will be explained in more detail below with reference to a preferred embodiment. The figures show:

1 shows a lighting device according to the preferred embodiment of the invention in an isometric, schematic representation,

FIG. 2 shows a plan view of essential components of the illumination device depicted in FIG. 1, FIG.

3 shows a side view of the semiconductor laser device, the aspherical lenses and the pinhole apertures and the first deflecting mirror gels of the illumination device shown in Figures 1 and 2 in a schematic representation, a side view of the first deflecting mirror, the plano-concave cylindrical lens and the second deflecting mirror of the illustrated in Figures 1 and 2 illumination device in a schematic representation, a side view of the second deflecting mirror, the plano-convex Cylindrical lens and the pivotable about an axis micromirror of the illumination device shown in Figures 1 and 2 in a schematic representation, a side view of the pivotable about an axis micromirror and the optical component for homogenizing the illumination or illuminance and the Lichtwellenlängen- conversion element of the in the figures 1 and 2 illustrated illumination device in a schematic representation, a longitudinal section through the optical component for homogenizing the illumination or illuminance in a schematic representation, a schematic representation of the expansion divergence of a laser light beam emitted by the semiconductor laser device of the illumination device depicted in FIGS. 1 and 2;

9 shows a schematic illustration of the effect of the optical component for homogenizing the illumination or illuminance on the laser light bundles, and FIG

10 is a plan view of the illuminated with laser light surface of

Lichtwellenlängenkonversionselements that in Figures 1 and 2 illustrated illumination device in a schematic representation

Preferred embodiment of the invention

In Figures 1 and 2, a lighting device 1 according to the preferred embodiment of the invention is shown schematically. This lighting device 1 is formed as part of a motor vehicle headlight, which is used for generating dipped beam, high beam, dynamic cornering light and other lighting functions of the motor vehicle headlight.

The illumination device 1 has a cuboidal housing 2, a semiconductor laser device 30 having six laser diodes 31 to 36, three deflection prisms 37 to 39, six aspheric optical lenses 41 to 46, a pinhole device 70 comprising six apertured diaphragms 71 to 76, a plano-concave optical lens 5 , two deflecting mirrors 61, 62, a plano-convex cylindrical lens 7, a micromirror 8 pivotable about an axis 80, an optical component 900 for homogenizing the illumination, which is also referred to below as an optical homogenizer, and a light wavelength conversion element 9. The abovementioned components of FIGS Lighting device 1 are all arranged in the housing 2 or on a wall 21 to 24 or on the bottom 20 of the housing 2. The semiconductor laser device 30, the deflection prisms 37 to 39 and the aspherical lenses 41 to 46 are also referred to as beam combiners 3. In FIGS. 3 to 6, the laser light beam path between some components of the illumination device 1 is shown schematically.

The housing 2 of the lighting device 1 is made of metal, preferably aluminum, and has a bottom 20 and four side walls 21 to 24 and a lid, which is not shown in Figures 1 and 2. The bottom 20 and the side walls 21 to 24 serve as a carrier for the components th the lighting device. 1 The outer dimensions of the cuboid housing 2 are 100 mm by 100 mm by 50 mm.

The semiconductor laser device 30 has six similar laser diodes 31, 32, 33, 34, 35 and 36, which each emit blue laser light with a wavelength of 450 nanometers during their operation. The laser diodes 31 to 36 are arranged in two, parallel to the bottom 20 extending lines and in three perpendicular to the bottom 20 extending columns. The laser diodes 31 to 36 are attached to a first side wall 21 of the housing 2 in such a way that the laser light beams 1 1 to 16 emitted by the laser diodes 31 to 36 are aligned perpendicular to the bottom 20 and parallel to the first side wall 21. In Figure 3, the arrangement and orientation of the laser diodes 31 to 36 is shown schematically. The laser diodes 31, 33, 35 are arranged in a first, parallel to the bottom 20 of the housing line above the bottom 20 and aligned such that the laser beam emitted by them 1 1, 13, 15 each perpendicular to the bottom 20 and the housing cover (not shown), which is opposite to the bottom 20. The laser diodes 32, 34, 36 are arranged in a second, parallel to the bottom 20 of the housing line extending at a greater height above the bottom 20 than the first line. The laser diodes 32, 34, 36 are aligned in such a way that the laser light beams 12, 14, 16 emitted by them each extend perpendicular to the floor 20 and are directed towards the floor 20. The laser diodes 31, 32 and 33, 34 and 35, 36 are each fixed to one another on the first side wall 21 of the housing 2. The laser light beams 1 1 to 16 radiated from the laser diodes 31 to 36 each have a highly elliptical profile with an extension of 30 micrometers in the direction of the large semiaxis of the ellipse and 1 micrometer in the direction of the small semiaxis of the ellipse. In addition, the expansion or divergence of the laser light beams 1 1 to 16 are each direction-dependent. In Figure 8, this fact is based on the laser light beam 1 1 schematically shown. The light propagation direction of the laser light beam 1 1 is represented by an arrow 110. The expansion or divergence of the laser light beam 1 1 is schematically illustrated by means of two fictitious planes E1, E2, which are each arranged perpendicular to the light propagation direction 1 10 at a distance from each other. Immediately after leaving the laser diode 31, the laser light beam 1 1 has an elliptical profile as shown schematically in Figure 8, for example, so that the laser light beam 1 1 on a screen, which is arranged in a plane E1 perpendicular to the propagation direction 1 10 of the laser light beam 1 1 is a laser spot or laser spot L1 caused by elliptical contour. Fast-Axis FA and Slow-Axis SA are arranged perpendicular to each other and each perpendicular to the light propagation direction 1 10 arranged. The divergence angle of the laser light beam 11 is approximately four times to five times its divergence angle along its slow axis SA along its fast axis FA. This different divergence of the laser light beam 1 1 along the slow axis SA and fast axis FA results in the shape and size of the laser spots L1, L2 caused by the laser light beam 11 on screens which are perpendicular to the light propagation direction 1 in planes E1, E2 10 are placed at different distances from the laser diode 31, are different. In particular, from the laser spot L1 caused by the laser light beam 1 1 with the contour of a vertically oriented ellipse at a sufficiently great distance to the laser diode 31, a laser spot L2 with the contour of a horizontally aligned ellipse in the representation of FIG. 8 is shown in FIG. 8 the light intensity in the laser light beam 1 1 shown schematically. The laser light beam 1 1 has a profile with a Gaussian curve-shaped distribution of the light intensity in the laser light beam 1 1. That is, the light intensity in the laser light beam 1 1, starting from a maximum reached in the center of the laser light beam 11, decreases toward its edge according to the course of a Gaussian curve to a minimum. The laser light intensity is thus inhomogeneously distributed in the laser light beam 11. In Figure 8, a sectional plane E3 is drawn, which is oriented perpendicular to the plane E1, and a drawn in the plane E3 Gaussian G represents schematically Accordingly, the illumination or the illuminance within a light spot or laser spot L1, L2, that of the laser light beam 1 1 on a screen in the plane E1 or E2 perpendicular to the light propagation direction 30 of the laser light beam 1 is the distribution of the light intensity in the laser light beam 1 is generated, correspondingly inhomogeneous. The degree of illumination or the illuminance in the laser spot L1, L2 on a screen placed in the plane E1, E2 likewise has a gaussian curve. That is, the respective laser spot L1, L2 has in its center the maximum illuminance. To the edge of the laser spot L1, L2, the illuminance decreases according to the course of a Gaussian curve.

FIG. 3 schematically shows the arrangement of the six laser diodes 31 to 36 of the semiconductor laser device 30 and the deflecting prisms 37 to 39 and the aspherical lenses 41 to 46. The laser light beams 1 1 to 16 generated by the laser diodes 31 to 36 are shown in FIGS. 1 to 5 by lines 1 1 to 16, which show the propagation directions of the laser light beams 1 1 to 16. During operation, the laser diodes 31 to 36 respectively generate blue laser light with a wavelength of 450 nanometers and a divergence angle of approximately 23 degrees along the fast axis and a divergence angle of approximately 6 degrees along the slow axis.

Each laser diode 31 to 36 is associated with an aspherical optical lens 41 to 46, which is passed by the laser light beams 1 1 to 16 each immediately after leaving the respective laser diode 31 to 36. The focal lengths of the aspherical optical lenses 41 to 46 are selected and tuned with the other optical components of the illumination device 1 such that the laser light beams 1 1 to 16 on a surface 90 of the light wavelength conversion element 9 each generate a laser spot L1 1 to L16 whose extent is horizontal Direction have a desired value, for example, each 360 microns. With the aid of two mirror surfaces of the first deflection prism 37, which is arranged between the first 31 and second laser diode 32, the first 1 1 and second laser light beam 12 are each deflected by an angle of 90 degrees, so that both laser light beams 1 1, 12 each parallel to the bottom 20 of the housing 2 and in the same direction. Similarly, with the aid of two mirror surfaces of the second deflection prism 38, which is arranged between the third 33 and fourth laser diode 34, the third 13 and fourth laser light beams 14 are each deflected by an angle of 90 degrees, so that both laser light beams 13, 14 each parallel to the bottom 20 of the housing 2 and in the same direction. Likewise, with the aid of two mirror surfaces of the third deflection prism 39, which is arranged between the fifth 35 and sixth laser diode 36, the fifth 15 and sixth laser light beams 16 are each deflected by an angle of 90 degrees, so that both laser light beams 15, 16 are parallel to the mirror Floor 20 of the housing 2 and extend in the same direction. Overall, all six laser light bundles 11 to 16 thus run parallel to the ground 20 and in the same direction after leaving the beam combiner 3. After leaving the beam combiner 3, the fast axis FA of the laser light beams 1 1 to 16 in the illustration of FIG. 3 is oriented perpendicular to the plane of the drawing and its slow axis SA lies in the plane of the drawing. Fast axis FA and slow axis SA are each oriented perpendicular to the light propagation direction of the laser light beams 1 1 to 16.

At the output of the beam combiner 3, the pinhole device 70 is arranged, which has six vertically stacked, slot-like pinholes 71 to 76. The pinholes 71 to 76 each have a height of 500 microns and a width of 75 microns. The distances between each two adjacent pinhole apertures 71 to 76 can be adjusted in accordance with a desired angular range for the illumination in the vertical direction. The slit-like apertured apertures 71 to 76 each hide edge regions of the laser light beams 1 1 to 16 in order to avoid scattered light. After passing through the apertured diaphragms 71 to 76, the laser light beams 1 1 to 16 strike the first deflecting mirror 61, which is arranged in the corner formed by the first 21 and second side wall 22. With the aid of the first deflecting mirror 61, the laser light beams 1 1 to 16 are each deflected by an angle of 90 degrees, so that they run at different heights above the ground 20 and parallel to the second side wall 22 and the bottom 20. The fast axis FA of the laser light beams 1 1 to 16 is oriented in each case parallel to the bottom 20 and the slow axis SA of the laser light beams 1 1 to 16 is arranged perpendicular to the bottom 20 in each case. The laser light beams 1 1 to 16 pass through a plano-concave cylindrical lens 5, which are shown schematically in FIG. The plano-concave cylindrical lens 5 is oriented in such a way that its concave curvature runs in the direction or along the fast axis FA of the laser light beams 11 to 16. As a result, the laser light beams 1 1 to 16 are only widened along their fast axis FA. The plano-concave cylindrical lens 5 does not act on the divergence of the laser light beams 1 1 to 16 along its slow axis SA.

After passing through the plano-concave cylindrical lens 5, the laser light beams 1 1 to 16 strike the second deflection mirror 62. With the aid of the second deflection mirror 62, which is arranged in the corner formed by the second 22 and third side wall 23 of the housing 2, the Laser light beam 1 1 to 16 deflected by an angle of 45 degrees, so that they meet after passing through the plano-convex cylindrical lens 7 on the centrally arranged in the housing 2 micromirror 8. The two deflecting mirrors 61, 62 allow a compact arrangement of the components of the lighting device 1 in the housing 2.

The micromirror 8 is designed as a MEMS mirror, wherein the abbreviation MEMS stands for Micro-Electro-Mechanical System. The dimensions of the mirror surface of the micromirror 8 are 5 mm by 1.5 mm. The micromirror 8 is fixed in a holder 81 on a base 82 on the bottom 20 of the housing 2, so that it extends around a vertical to the bottom 20 extending Swivel axis 80 is pivotable. With the aid of the micromirror 8, the laser light beams 1 1 to 16 are directed onto the surface 90 of the light wavelength conversion element 9 via the optical homogenizer 900. By a pivoting movement of the micromirror 8 about its pivot axis 80, a surface portion of the surface 90 of the light wavelength conversion element 9 is scanned line by line with the laser light beams 11 to 16. For scanning, the micromirror 8 oscillates about its pivot axis 80 at a frequency of, for example, 133 Hz. The surface portion of the surface 90 of the light wavelength conversion element 9 which can be illuminated by the laser light beams 11 to 16 is limited by the pivoting range 17 of the micromirror 8. In FIG. 1, the maximum pivoting range is shown schematically by means of dashed lines 17. The control of the micromirror 8 is electro-magnetic. As a result, the micromirror 8 can also be operated statically instead of an oscillatory movement in order to hold it in a desired orientation, for example, or the speed of the pivoting movement can be changed or the pivoting movement can be carried out only over part of the maximum pivoting range. The maximum pivoting range may be smaller or larger than the lateral dimensions of the Lichtwellenlängenkonversionsele- ment.

FIG. 10 schematically shows the arrangement of the laser spots L1 1 to L16 generated by the laser light bundles 11 to 16 on the surface 90 of the light wavelength conversion element corresponding to a snapshot of the pivoting movement of the micromirror 8. The laser spots L1 1 to L16 are arranged vertically above one another on the surface 90 of the light wavelength conversion element 9 and are guided over the surface 90 by the pivoting movement of the micromirror 8 about its pivot axis 80 simultaneously along the scanning directions 91 symbolized by double-headed arrows. The distance between the laser spots L1 1 to L16 on the surface 90 of the light wavelength conversion element 9, with the aid of the plano-convex cylindrical lens 7 and the optical homogenizer 900 to a desired value. For example, the focal length of the plano-convex cylindrical lens 7 and the dimensions of the optical homogenizer 900 are selected so that the distance between two adjacent laser spots L1 1, L13 and L13, L15 etc. on the surface 90 of the light wavelength conversion element 9 is 12.5 microns ,

The fast axis FA of the laser light beams 1 1 to 16, when they impinge on the surface 90 of the light wavelength conversion element 9, in each case run parallel to the scanning directions 91 and their slow axis runs perpendicular to the scanning directions 91. For the sake of clarity, this situation is shown only twice in FIG. 7 for the laser spots L15 and L16 caused by the laser light bundles 15 and 16. The laser spots L1 1, L13, L15 each have a maximum dimension of 900 micrometers in the direction of the slow axis SA and in each case a maximum dimension of 360 micrometers in the direction of the fast axis FA. The laser spots L12, L14, L16 each have a maximum dimension of 600 micrometers in the direction of the slow axis SA and in each case a maximum dimension of 360 micrometers in the direction of the fast axis FA. The contour of the laser spots L1 1 to L16 is elliptical in each case, wherein the large semiaxis of the elliptical contour runs in each case parallel to the slow axis SA and the small semiaxis of the elliptical contour parallel to the fast axis FA and parallel to the scanning directions 91.

5 shows a side view of the second deflecting mirror 62, the plano-convex cylindrical lens 7 and the micromirror 8. FIG. 5 schematically shows the course of the laser light beams 11 to 16 between the second deflecting mirror 62 and the micromirror 8. After the deflecting mirror 62, all the laser light beams 1 1 to 16 impinge on the plano-convex cylindrical lens 7. With the aid of the plano-convex cylindrical lens 7, the slow axis SA of the laser light beams 1 1 to 16 is transmitted via the optical homogenizer 900 on the surface 90 of the light wavelength conversion element 9 adjusted so that the vertical distance between the laser spots L1 1 to L16 to a desired value, for example to the above-mentioned value of 12.5 microns between adjacent laser spots. The focal length of the plano-convex cylindrical lens 7 is therefore chosen accordingly. Its focus 700 lies in the region between the micromirror 8 and the optical homogenizer 900 (FIG. 6). The convex curvature of the plano-convex cylindrical lens 7 is oriented parallel to the slow axis SA of the laser light beams 1 1 to 16. Therefore, the plano-convex cylindrical lens 7 unfolds its focusing effect only on the slow axis SA of the laser light beams 11 to 16. In FIG. 5, the fast axis FA of the laser light beams 11 to 16 is perpendicular to the drawing plane and the slow axis, respectively oriented in the drawing plane perpendicular to the light propagation direction.

FIG. 6 shows a side view of the micromirror 8, the optical homogenizer 900 and the light wavelength conversion element 9 in a schematic representation. FIG. 6 diagrammatically shows the course of the laser light beams 1 1 to 16 between the micromirror 8 and a light coupling surface 901 of the optical homogenizer 900 as well as the surface 90 of the light wavelength conversion element 9. By the refraction of the laser light beams 1 1 to 16 on the plano-convex cylindrical lens 7 and the arrangement of their focal line or their linear focus 700 in front of the optical see homogenizer 900, the arrangement of the laser light beams 1 1 to 16 is reversed, so that of the laser light beam 16 laser spot L16 is the lowest laser spot and the laser spot L15 caused by the laser light beam 15 is the highest laser spot on the surface 90 of the light wavelength conversion element 9 (FIG. 10). FIG. 7 shows a schematic representation of a longitudinal section through the optical homogenizer 900.

The optical homogenizer 900 has six rectangular glass plates 910, 920, 930, 940, 950, 960, which are lined up along an axis 100 perpendicular to its plane of the plate. Between two adjacent glass plates is a film 915, 925, 935, 945, 955 made of polytetrafluoroethylene. Luoräthylen arranged, each acts as a connecting means between these glass plates.

The six glass plates 910, 920, 930, 940, 950, 960 and the polytetrafluoroethylene foils 915, 925, 935, 945, 955 are therefore arranged alternately one above another in the schematic longitudinal section in FIG. 7 in the manner of a sandwich, so that the optical component or the optical homogenizer 900 is almost cuboid. The glass plates 910, 920, 930, 940, 950, 960 and the polytetrafluoroethylene foils 915, 925, 935, 945, 955 are bonded together by lamination. The transparent glass plates 910, 920, 930, 940, 950, 960 each consist of borosilicate crown glass and have an optical refractive index of 1.52. The likewise transparent polytetrafluoroethylene films 915, 925, 935, 945, 955 have an optical refractive index of 1.35.

The length L of the glass plates 910, 920, 930, 940, 950, 960 is 18 millimeters each and their width (perpendicular to the plane of the drawing in Fig. 7) is 20 millimeters each.

The lower three glass plates 910, 920, 930 each have a thickness of 600 microns. The polytetrafluoroethylene foils 915, 925 arranged between the glass plates 910 and 920 as well as 920 and 930 each have a thickness of 12.5 micrometers. The distance between the glass plates 910 and 920 and 920 and 930 is therefore 12.5 microns each.

The upper three glass plates 940, 950, 960 each have a thickness of 900 microns. The polytetrafluoroethylene films 935, 945, 955 arranged between the glass plates 930 and 940 as well as 940 and 950 as well as 950 and 960 each have a thickness of 12.5 micrometers. The distance between the glass plates 930 and 940 as well as 940 and 950 as well as 950 and 960 is therefore 12.5 micrometers each. Each glass plate 910, 920, 930, 940, 950, 960 is provided with an optical lens structure 91 1, 921, 931, 941, 951, 961 at an end face extending perpendicularly to the plane of the plate. The optical lens structures 91 1, 921, 931, 941, 951, 961 are each formed as concave cylindrical lenses which are parallel to the plane of the plate in the direction of the width B (in FIG. 7 perpendicular to the plane of the page) of the respective glass plate 910, 920, 930, 940 , 950, 960 and whose concave curvature extends perpendicular to the plane of the plate of the respective glass plate 910, 920, 930, 940, 950, 960. The optical lens structures 91 1, 921, 931, 941, 951, 961 of the glass plates 910, 920, 930, 940, 950, 960 are oriented such that they are arranged on the same side of the optical component 900 or homogenizer. The optical lens structures 91 1, 921, 931, 941, 951, 961 each form a light coupling surface for the respective glass plate 910, 920, 930, 940, 950, 960 and together a light coupling surface 901 for the optical homogenizer 900.

Based on the schematic representation in Figure 9, the function of the optical homogenizer 900 is explained below.

With the help of the Beamcombiners 3, the pinhole device 70, the optical cylindrical lenses 5 and 7 and pivotable about the axis 80 mirror element 8, the six laser light beams 1 1 to 16, shaped and steered such that each of the laser light beams 1 1 to 16 each on the optical lens structure 91 1, 921, 931, 941, 951, 961 meets only one glass plate 910, 920, 930, 940, 950, 960, so that each laser light beam 1 1 to 16 in only one glass plate 910, 920, 930, 940, 950, 960 is coupled. By the pivoting movements of the mirror element 8, each laser light beam 1 1 to 16 in each case over a surface portion of the corresponding concave cylindrical lens 91 1, 921, 931, 941, 951 and 961, parallel to the plane of the glass plates 910, 920, 930, 940, 950, 960, led. The laser light bundles 1 1 to 16 are each a laser light bundle that has been generated by a blue laser light generating laser diode. The Laser light beams 1 1 to 16 each have a profile with a gaussian-shaped distribution of the light intensity in the laser light beam. This means that the light intensity in the respective laser light beam 1 1 to 16, starting from a maximum, which is reached in the center of the respective laser light beam, towards the edge of the respective laser light beam 1 1 to 16 according to the course of a Gaussian curve to a minimum decreases. The laser light intensity is thus inhomogeneously distributed in each laser light beam 1 1 to 16. Accordingly, the illumination or illuminance within a light spot or laser spot, which is generated by the respective laser light beam 1 1 to 16 on a screen in a plane E1 perpendicular to the light propagation direction of the respective laser light beam 1 1 to 16, correspondingly inhomogeneous. The degree of illumination or the illuminance in the respective laser spot on a screen placed in the plane E1 also has a gaussian curve shape. This means that the respective laser spot has the maximum illuminance at its center. To the edge of the laser spot, the illuminance decreases according to the course of a Gaussian curve.

In FIG. 9, the gaussian curve shape of the intensity profile of the laser light beams 11 to 16 or the degree of illumination in the laser spots caused by them on a screen in the plane E1 is shown schematically.

Each of the laser light beams 1 1 to 16 strikes one of the concave cylindrical lenses 91 1, 921, 931, 941, 951, 961 and is via the respective cylindrical lens 91 1, 921, 931, 941, 951, 961 in the respective, to the corresponding Cylinder lens 91 1, 921, 931, 941, 951, 961 glass plate 910, 920, 930, 940, 950, 960 coupled. When passing the respective concave cylindrical lens 91 1, 921, 931, 941, 951, 961, the laser light beams 1 1 to 16 are respectively expanded in directions perpendicular to the plane of the plates of the transparent glass plates 910, 920, 930, 940, 950, 960. Each laser light beam 1 1 to 16 is within the respective glass plate 910, 920, 930, 940, 950, 960th by total reflection at the interfaces to the polytetrafluoroethylene foils 915, 925, 935, 945, 955 to a light output surface 912, 922, 932, 942, 952, 962 of the respective glass plate 910, 920, 930, 940, 950, 960 passed. The light output surfaces 912, 922, 932, 942, 952, 962 extend perpendicular to the plane of the plates of the glass plates 910, 920, 930, 940, 950, 960 and are diametrically opposite to the concave cylindrical lenses 91 1, 921, 931, 941, 951, 961 arranged. The light output surfaces 912, 922, 932, 942, 952, 962 of the glass plates 910, 920, 930, 940, 950, 960 together form a light output surface 902 of the optical homogenizer 900. By multiple total reflection in the glass plates 910, 920, 930, 940, 950, 960, the distribution of the light intensity within the laser light beams 1 1 to 16 in directions perpendicular to the plane of the plate or parallel to the axis 100 is homogenized, so that the degree of illumination or the illuminance in laser spots L1 1, L12, L13, L14, L15 L16, which are generated by the laser light beams 1 1 to 16 on a the optical homogenizer 900 in the laser light beam path downstream surface 90 of the Lichtwellenlängenkonversi- onselements 9, parallel to the axis 100 and perpendicular to the plate plane of the glass plates 910, 920, 930, 940th , 950, 960 is even. FIG. 9 schematically illustrates this situation by means of rectangles on the surface 90, which symbolize the degree of illumination parallel to the axis 100 within each laser spot L1 1, L12, L13, L14, L15, L16 on the surface 90 of the light wavelength conversion element 9.

With the aid of the optical homogenizer 900, laser spots L1 1, L12, L13 caused by the laser light beams 11 to 16 on the surface 90 of the light wavelength conversion element 9 are used. L14, L15, L16 each homogenize the light intensity along the slow axis SA. In addition, by means of the optical homogenizer 900, the dimensions of the laser spots L1 1, L12, L13. L14, L15, L16 and their distances from one another in directions perpendicular to the plane of the glass plates 910, 920, 930, 940, 950, 960 set precisely. Since the surface 90 of the light wavelength Therefore, the dimensions of the laser spots L1 1, L13, L15 along the slow axis correspond to the thickness of the glass plates 940, 950, 960 and the distances between the laser spots L1 1, L13 , L15 on the surface 90 of the light wavelength conversion element 9 correspond to the distances between the aforementioned glass plates 940, 950, 960 of the optical homogenizer 900. Analogously, the dimensions of the laser spots L12, L14, L16 along the slow axis correspond to the thickness of the glass plates 910, 920 , 930 and the distances between the laser spots L12, L14, L14 on the surface 90 of the Lichtwellenlängenkonversionsele- element 9 correspond to the distances between the aforementioned glass plates 910, 920, 930 of the optical homogenizer 900th

The light output surface 902 of the optical homogenizer 900 is preferably provided with a non-reflective coating (not shown) in order to avoid reflection of the laser light beams 1 1 to 16 at the light output surface 902.

The surface 90 of the light wavelength conversion element 9 is arranged directly on the light outcoupling surface 902 of the optical homogenizer 900. For example, the light wavelength conversion element 9 may have a transparent substrate, for example a sapphire plate, which is connected to the light output surface 902 of the optical homogenizer 900.

The light wavelength conversion element 9 is arranged in a window 230 in the third side wall 23 of the housing 2 of the illumination device 1. The light wavelength conversion element 9 consists of a ceramic phosphor which is arranged on a transparent substrate, which is formed for example as a rectangular sapphire plate. The phosphor used is cerium-doped yttrium aluminum garnet (YAG: Ce). The dimensions of the window area of the window 230 and of the window arranged therein th light wavelength conversion element 9 amount to only a few square millimeters, for example 100 mm ² .

The surface 90 of the light wavelength conversion element 9 is disposed within the housing 2 and its opposite surface 92 is disposed outside the housing 2. The blue laser light generated by the laser light beams 1 1 to 16 and impinging on the surface 90 in the laser spots L1 1 to L 16 penetrates the light wavelength conversion element 9 and is proportionately converted into light of a different wavelength with an intensity maximum in the wavelength range from 560 nanometers to 590 nanometers by means of the phosphor is converted so that from the surface 92 of the light wavelength conversion element 9 white light is emitted, which is a mixture of non-wavelength-converted blue laser light and the light wavelength conversion element 9 wavelength-converted light.

Overall, therefore, arranged in the window 230 light wavelength conversion element 9 and its located on the outside of the housing 2 surface 92 can be regarded as a light source that emits white light with high intensity and luminance.

For use in a motor vehicle headlight, the surface 92 of the light wavelength conversion element 9 can be projected by means of secondary optics, for example by means of projection optics, on the roadway in front of the vehicle to produce a desired light distribution, for example for low beam or high beam. The desired light distribution is generated on the surface 90 of the light wavelength conversion element 9 with the aid of the laser spots L1 1 to L16. The laser spots L1 1 to L16 are guided by the pivotal movement of the micromirror 8 in directions parallel to the plane of the glass plates 910, 920, 930, 940, 950, 960 over a surface portion of the surface 90 of the light wavelength conversion element 9. During the pivoting movement of the micromirror 8, for example, individual laser diodes 31 to 36 may be temporarily switched off or dimmed, or operated excessively in terms of current, so that individual laser spots L1 1 to L16 are temporarily changed in their intensity or or and modulated, or the pivoting range of the micromirror 8 can be limited to change the light distribution.

The lighting device 1 is part of a Kraftfahrzeugscheinwer- fers. The two mutually opposite side walls 22, 24 of the housing 2 are each provided on their outer side with a fastening device 220, 240, which allows mounting of the lighting device 1 in a motor vehicle headlight.

The invention is not limited to the above-described embodiment of the invention.

For example, instead of six laser diodes 31 to 36, a smaller or a larger number of laser diodes may be used. In addition, the optical components 41 to 46, 5 and 7 may be formed such that the dimensions of the laser spots L1 1 to L16 in the direction of the slow axis and fast axis have different values than in the embodiment of the invention explained above. In particular, some or all of the laser spots L1 1 to L16 on the surface 90 of the light wavelength conversion element 9 may also be arranged overlapping or at different distances. Furthermore, the illumination device 1 can have a plurality of light wavelength conversion elements 9 whose surface is scanned with the aid of the micromirror 8 with laser light. It can also be provided several micromirrors 8. To scan a surface portion of the surface of one or more light wavelength conversion elements 9 with laser light. The light wavelength conversion element 9 can also be designed as a fluorescent wheel rotatably mounted about its axis. By a rotation of the phosphor wheel, the illumination duration of the areas coated with phosphor is reduced and thus the heat dissipation is improved. The phosphor wheel may also include segments of different phosphor coverage. have layering, for example, to produce white light with different color temperature.

The illumination device 1 according to the invention can also have more than just one optical homogenizer 900. In particular, the illumination device 1 according to the invention can have two optical homogenizers 900 with different spatial orientation of the plate plane of the glass plates 910, 920, 930, 940, 950, 960. In particular, the plate plane of the transparent glass plates of the second optical component can be arranged perpendicular to the plate plane of the transparent glass plates of the first optical component, the light intensity of the laser light bundles or the degree of illumination of the laser spots generated by the laser light bundles on the surface 90 of the light wavelength conversion element 9 not only to homogenize along the slow axis SA, but also along the fast axis FA.

LIST OF REFERENCE NUMBERS

1 lighting device

1 1, 12, 13 laser light bundles

14, 15, 16 laser light bundles

100 axis perpendicular to the plate plane of the glass plates of the optical homogenizer

1 10 light propagation direction

2 housings

20 floor

21 first side wall

22 second side wall

23 third side wall

24 fourth side wall

220, 240 fasteners

3 semiconductor laser device

30 semiconductor laser device

31, 32, 33 laser diodes

34, 35, 36 laser diodes

37, 38, 39 deflection prisms

41, 42, 43 aspherical optical lenses

44, 45, 46 aspherical optical lenses

5 plano-concave cylindrical lens

61, 62 deflecting mirror

7 plano-convex cylindrical lens

700 focal line of the plano-convex cylindrical lens 7

8 swiveling micromirror

80 pivot axis of the micromirror

81 Holder of the micromirror

82 Base of the micromirror

9 light wavelength conversion element REFERENCE LIST (Continued;

90 inside surface of the Lichtwellenlängenkon- conversionelements

92 outer surface of the Lichtwellenlängenkon- conversionelements

91 scanning directions

900 optical homogenizer

901 light input surface of the homogenizer

902 light output surface of the homogenizer

910, 920, 930 transparent plate, glass top

940, 950, 960 transparent plate, glass top

91 1, 921, 931 concave cylindrical lens on the homogenizer

941, 951, 961 concave cylindrical lens on the homogenizer

912, 922, 932 light output surface

942, 952, 962 light output surface

915, 925, 935 polytetrafluoroethylene film

945, 955 polytetrafluoroethylene film

L1 1. L12, L13 laser spot

L14, L15 L16 laser spot

L1, L2 laser spot

E1, E2, E3 fictitious plane

FA fast axis of the laser light beam

SA slow axis of the laser light bundles

G Gauss curve

Claims

claims

Lighting device (1) with a semiconductor laser device (30) which is designed to generate a plurality of laser light beams (1 1 to 16), and at least one light wavelength conversion element (9), which is formed light of the laser light beam (1 1 to 16) at least partially into an optical system adapted to direct the laser light beams (1 1 to 16) onto a surface (90) of the at least one light wavelength conversion element (9), the optical system at least one 80) pivotable mirror element (8), which is designed to guide the laser light beams (1 1 to 16) over at least a surface portion of the surface (90) of the at least one light wavelength conversion element (9), and wherein the optics means (7, 41 to 46, 5, 70, 900) for adjusting a divergence of the laser light beams (1 1 to 16) along a slow axis (SA) and / or a fast axis (F A) the laser light beam (1 1 to 16) on the surface portion of the surface (90) of the at least one Lichtwellenlängenkonversions- (9) and means (900) for homogenizing the illumination in light spots (L1 1, L12, L13, L14, L15, L16) generated by the laser light beams (11 to 16) on the surface portion of the surface (90) of the at least one light wavelength conversion element (9).

2. Lighting device (1) according to claim 1, wherein the optics and the semiconductor laser device (30) are formed such that the laser light beams (1 1 to 16) each parallel to a scanning direction (91) over the surface portion of the surface (90) of the at least one

Lichtwellenlängenkonversionselements (9) are guided and the means (900) for homogenizing the illumination in light spots (L1 1, L12, L13, L14, L15, L16) formed by the laser light beams (11 to 16) on the surface portion of the surface (90) of the at least one light wavelength conversion element (9) are formed such that the illumination in the light spots (L1 1, L12, L13, L14, L15, L16) is homogenized at least along an axis perpendicular to the scanning direction (91) extending axis.

Lighting device according to claim 2, wherein the means (900) for homogenizing the illumination in light spots (L1 1, L12, L13, L14, L15, L16), which are of the laser light beams (1 1 to 16) on the surface portion of the surface (90). of the at least one light wavelength conversion element (9), comprise an optical component (900) comprising a plurality of transparent plates (910, 92, 930, 940, 950, 960) aligned along an axis (100) perpendicular to their plane of the plate , wherein between each two adjacent transparent plates (910, 92, 930, 940, 950, 960) a separation means (915, 925, 935, 945, 955), the total reflection of light in the transparent plates (910, 920, 930 , 940, 950, 960) at the interfaces of the transparent plates to the respective separating means, and wherein the optical component (900) is arranged such that the plate planes are aligned parallel to the scanning direction (91).

Lighting device according to claim 3, wherein the optical component (900) has a non-parallel to the plane of the transparent plates (910, 92, 930, 940, 950, 960) oriented light output surface (902) on which the at least one light wavelength conversion element (9) is.

Lighting device according to claim 3 or 4, wherein the optics and the at least one, about at least one axis (80) pivotable Mirror element (8) are formed such that the laser light beams (1 1 to 16) in each case only in a transparent plate (910, 92, 930, 940, 950, 960) of the optical component (900) are coupled.

Lighting device according to one of claims 1 to 5, wherein the means for adjusting a divergence of the laser light bundles (1 1 to 16) along a slow axis (SA) and / or a fast axis (FA) of the laser light beams (1 1 to 16 ) are formed on the surface portion of the surface (90) of the at least one light wavelength conversion element (9) such that the divergence of the laser light beams (1 1 to 16) is adjusted perpendicular to the scanning direction (91).

Lighting device according to claim 6, wherein the optics and the semiconductor laser device (30) are formed such that the slow axis (SA) of the laser light beams (1 1 to 16) on the surface portion of the surface (90) of the at least one light wavelength conversion element (9 ) is arranged in each case perpendicular to the scanning direction (91).

Lighting device according to one of claims 1 to 7, wherein the means for adjusting a divergence of the laser light beams (1 1 to 16) along a slow axis (SA) and or a fast axis (FA) of the laser light beams (1 1 to 16 ) on the surface portion of the surface (90) of the at least one light wavelength conversion element (9) at least one pinhole diaphragm device (70) for beam shaping for the laser light bundles (1 1 to 16).

Lighting device according to one of claims 1 to 8, wherein the means (7, 41 to 46, 5) for adjusting a divergence of the laser light beams (1 1 to 16) along a slow axis (SA) and / or a fast axis ( FA) of the laser light beam (1 1 to 16) on the surface section of the surface (90) of the at least one light wavelength conversion element (9) comprise at least a first cylindrical lens (7) for focusing the laser light beams (1 1 to 16) along its slow axis (SA). 10. Lighting device according to one of claims 1 to 9, wherein the means (7, 41 to 46, 5) for adjusting a divergence of the laser light beam (1 1 to 16) along a slow axis (SA) or or and a Fast- Axis (FA) of the laser light beams (1 1 to 16) on the surface portion of the surface (90) of the at least one light wavelength conversion element (9) at least one aspheric optical element (41 to 46) for focusing a fast axis (FA) of the laser light beam (1 1 to 16).

1 1. Lighting device according to one of claims 1 to 10, wherein the means (7, 41 to 46, 5) for adjusting a divergence of the laser light bundle along a slow axis (SA) and / or a fast axis (FA) of the laser light beam (1 1 to 16) comprise on the surface portion of the surface (90) of the at least one Lichtwellenlängenkonversions- (9) at least one second cylindrical lens (5) for the purpose of adjusting the divergence of at least one laser light beam (1 1 to 16) along the fast axis (FA) in the light beam path of at least one laser light beam (1 1 to 16) is arranged.

12. Lighting device according to one of claims 1 to 1 1, wherein the semiconductor laser device (30) comprises a plurality of laser diodes (31 to 36), each adapted to generate blue laser light during operation, and wherein the at least one light wavelength conversion element (9) is adapted to convert blue laser light proportionally into light of other wavelengths, so that white light emits from the at least one light wavelength conversion element (9). is a mixture of non-wavelength-converted blue laser light and on at least one Lichtwellenlängenkonver- sion element (9) wavelength-converted light.

Lighting device (1) according to one of claims 1 to 12, wherein the illumination device (1) is formed as part of a motor vehicle headlight or as a motor vehicle headlight.