Optical arrangement and headlights

Abstract

Optical arrangement for a Laser Activated Remote Phosphor (LARP) system, comprising a housing (26) in which a plurality of blocks (1a, 1b, 1c, 1d) are arranged, each having at least two radiation sources (2), via which an excitation radiation can be emitted, and in which a phosphor (12) is provided for at least partially converting the excitation radiation into conversion radiation, wherein the conversion radiation forms at least a portion of a useful radiation that can be emitted via an exit opening of the housing (26), wherein the plurality of blocks (1a, 1b, 1c, 1d) are arranged in the circumferential direction of a main optical axis (A) of the arrangement and surround the main optical axis (A) in a rotationally symmetrical manner, and wherein the at least two radiation sources (2) of each of the plurality of blocks (1a, 1b, 1c, 1d) are arranged along a direction parallel to the main optical axis (A).

Description

[0001] The invention is based on an optical arrangement according to the preamble of claim 1 and a headlight having the optical arrangement.

[0002] In the entertainment sector, developments are leading to ever brighter light sources with ever higher luminous flux. An optical arrangement comprising an elongated housing is known from the prior art, particularly for video projection applications. An exit opening for radiation is provided in an elongated side surface of the housing, with the exit opening being formed approximately at the end of the side surface. Radiation sources are arranged in the housing approximately along a longitudinal axis of the housing, emitting excitation radiation in the form of laser radiation. The excitation radiation is directed via mirrors onto a light wavelength converter located opposite the exit opening in the housing. The converter, which comprises a phosphor, then couples conversion radiation formed by at least partial conversion of the excitation radiation to the exit opening.In addition, unconverted radiation from a radiation source can be supplied in the usual way through a so-called "blue loop", in which the excitation radiation is guided through an opening in the converter in order to provide unconverted radiation with the excitation radiation for the useful light. A disadvantage of this solution is the comparatively poor handling of the housing. For example, it is difficult to install the optical arrangement in a moving head spotlight, which is common in the entertainment sector, e.g. for stage lighting. The object of the present invention is to create an optical arrangement that is easy to handle and / or install, as well as a spotlight having the optical arrangement.

[0003] DE 102012201307 A1 describes a conversion unit comprising a conversion element. The conversion element has a first side and a second side facing away from the first side and is designed to convert a wavelength spectrum of an excitation beam incident on the conversion element and thus generate conversion radiation. In one example, a laser arrangement comprises a plurality of radiation sources arranged on a substrate, each generating an excitation beam. A plurality of deflection elements arranged on the substrate each deflect one of the excitation beams to corresponding conversion elements such that deflected excitation beams have mutually parallel directional components. The radiation sources are arranged such that their undeflected excitation beams form a star shape.

[0004] DE 102014226336 A1 describes a lighting module in which a phosphor body can be irradiated by several laser modules, which laser modules are arranged angularly symmetrically around the phosphor body.

[0005] US 2011 / 0128505 A1 describes a laser beam source device comprising: a first light emitting element; a second light emitting element; and first and second splitting units.

[0006] The problem is solved with regard to the optical arrangement according to the features of patent claim 1 and with regard to the headlight according to the features of the independent patent claim.

[0007] Particularly advantageous embodiments can be found in the dependent claims.

[0008] According to the invention, an optical arrangement or an optical device for a Laser Activated Remote Phosphor (LARP) system is provided. The arrangement can be provided in a housing. Advantageously, at least two radiation sources can be provided in the housing, each emitting excitation radiation. The excitation radiation is preferably laser radiation, in particular blue laser radiation. In addition, a phosphor can be provided in the housing, by means of which the excitation radiation can be at least partially or completely converted into conversion radiation. The conversion radiation can form at least a portion of a useful radiation that can be emitted through an exit opening of the housing. Advantageously, the at least two radiation sources can be arranged in the circumferential direction around a main optical axis of the arrangement.

[0009] This solution has the advantage of enabling a compact design of the arrangement, which improves handling compared to the prior art. For example, such an arrangement can be extremely easily incorporated into a cylindrical spotlight in the entertainment sector. In the prior art, however, the radiation sources are arranged in a row, for example, resulting in an elongated and difficult-to-handle arrangement.

[0010] Alternatively or in addition to arranging the radiation source around the main optical axis, the phosphor can be part of a converter, which is, for example, designed to be reflective. In this case, the excitation radiation from the at least two radiation sources can advantageously be directed to different areas on the phosphor. This allows the resulting waste heat to be better distributed across the phosphor and not just in one area of ​​the phosphor. This enables improved cooling of the arrangement. For this reason, low-power cooling systems, for example, can be used, which can save energy. Furthermore, the service life of the optical arrangement can be increased.

[0011] The housing can have an end face and a lateral surface or lateral structure, wherein the main optical axis, which can extend in particular through the exit opening, is arranged approximately centrally on the lateral surface. The lateral surface is then preferably arranged around the end face and encompasses it. The housing can, for example, be approximately cylindrical and / or approximately conical and / or approximately frustoconical and / or approximately rotationally symmetrical about the main optical axis.

[0012] In a further embodiment of the invention, the main optical axis of the arrangement can be located approximately centrally in the housing. In a rotationally symmetrical housing, the main optical axis can, for example, coincide with the axis of symmetry. This has the advantage of enabling a very compact design of the arrangement.

[0013] The main optical axis is preferably enclosed by the lateral surface of the housing. At one end of the housing, viewed in the direction of the main optical axis, the housing can advantageously have an end face through whose center the main optical axis can run. The exit opening for the useful radiation can then be provided in the end face of the housing, particularly centrally. This makes it possible to create the required compact design in which the light exit surface is located on one end face of the housing. This can facilitate assembly and operation, for example in a so-called "moving head" in the entertainment sector.

[0014] In a further embodiment of the invention, additional radiation from at least one radiation source or from at least one further radiation source can exit directly through the exit opening, i.e. without being converted by the phosphor. This means that the additional radiation can be mixed with the conversion radiation, for example. For example, it is conceivable that blue excitation radiation is converted into yellow conversion radiation and then exits through the exit opening as useful light together with unconverted (in the case of partial conversion) excitation radiation and the additional radiation. For this purpose, a radiation channel can be provided in which the radiation from at least one radiation source is not deflected onto the converter, but is coupled into the exit opening directly or via an arrangement of one or more mirrors.The advantage of this embodiment is that the useful light, for example, white useful light, can be formed from a mixture of excitation radiation and conversion radiation that is essentially constant over time. This prevents artifacts known in the prior art, such as the so-called "color break," which occurs when excitation radiation and conversion radiation are sequentially superimposed.

[0015] In a preferred embodiment of the invention, a light guide can be provided, in particular to mix the radiation coupled out via the exit opening or the useful light coupled out via the exit opening. The light guide is preferably designed as an integrator rod. The integrator rod preferably has an input coupling surface and an output coupling surface. The output coupling surface can then simply form the exit opening. Advantageously, the integrator rod results in a high level of light homogeneity relative to its cross-sectional area by mixing the radiation guided through the integrator rod. Furthermore, it can be advantageous for the integrator rod to extend, in particular approximately coaxially to the main optical axis.

[0016] In a further embodiment of the invention, the phosphor can be at least partially or completely disc-shaped or annular. Advantageously, the phosphor is configured as a round disc or a circular ring, which allows it to be easily inserted into the symmetrical housing, for example. The phosphor can be arranged, for example, on a holding element or substrate. It is conceivable that the phosphor, together with the holding element, forms the converter for converting the excitation radiation.

[0017] It is also conceivable to provide the phosphor on the holding element in sections by forming a plurality of phosphor spots. The holding element is preferably designed to be reflective, whereby the conversion radiation and, if partial conversion is present, unconverted excitation radiation are directed into a beam path towards the exit opening. Preferably, one radiation source or some of the radiation sources or all of the radiation sources are designed as at least one light-emitting diode (LED). Radiation sources are advantageously combined. For example, the combination is achieved by arranging several radiation sources in a block, in which case one block or several blocks can be provided.

[0018] The radiation sources can, for example, emit radiation, in particular radially inwards towards the main optical axis.

[0019] The radiation sources or blocks can be arranged approximately circularly, in particular on a partial circle, around the main optical axis. In other words, the radiation sources or blocks can form a kind of carousel around the phosphor and the main optical axis. Viewed in the direction of the main optical axis, the radiation sources can be arranged between the phosphor and the exit opening.

[0020] The LED can be in the form of at least one individually packaged LED or in the form of at least one LED chip having one or more light-emitting diodes. Multiple LED chips can be mounted on a common substrate (“submount”) to form an LED, or they can be attached individually or jointly, for example, to a circuit board (e.g., FR4, metal-core board, etc.) (“CoB” = chip on board). The at least one LED can be equipped with at least one separate and / or shared optics for beam guidance, for example, with at least one Fresnel lens or a collimator. Instead of or in addition to inorganic LEDs, for example based on AlInGaN, InGaN, or AlIn-GaP, organic LEDs (OLEDs, e.g., polymer OLEDs) can generally also be used.

[0021] A laser (light amplification by stimulated emission of radiation) can also be provided as the radiation source. Lasers can be configured in various regions of the electromagnetic spectrum, for example microwaves, infrared, visible light, ultraviolet, or X-rays. Laser radiation in the visible light range, in particular in the blue spectrum, is particularly preferred. In a preferred embodiment of the arrangement, at least two blocks with radiation sources are arranged in series, viewed from the phosphor towards the front of the housing. The at least two blocks can then form a radiation channel. Advantageously, several radiation channels are provided in the arrangement.

[0022] In order to redirect the excitation radiation from at least one of the radiation sources, or a portion of the radiation sources, or all of the radiation sources, to a desired beam path, at least one or more mirrors may be provided. This mirror(s) may be arranged radially between the main optical axis and the corresponding radiation source, as viewed from the main optical axis.

[0023] In a further embodiment of the invention, a collecting mirror is provided that directs the excitation radiation or radiation from a plurality of radiation sources or blocks. At least one mirror, or some of the mirrors, or all of the mirrors can be arranged such that it / they redirect the excitation radiation or radiation onto the at least one collecting mirror. It is also conceivable to use the collecting mirror without the mirror(s) to direct radiation or excitation radiation.

[0024] Advantageously, the at least one collecting mirror is arranged such that it deflects the excitation radiation, which is deflected in particular by the mirror or some of the mirrors or by all of the mirrors, onto at least one dichroic mirror. The collecting mirror can advantageously be arranged, viewed in the direction of the main optical axis, axially between the at least two blocks of a radiation channel and / or radially between the main optical axis and the blocks. This has the advantage that the excitation radiation from at least two radiation sources or from two blocks can be collected via the collecting mirror and deflected onto the dichroic mirror. This makes it possible to achieve a high radiation density because several blocks or radiation sources can be easily combined to form a radiation channel.By arranging a collecting mirror, installation space can be saved, since not every excitation radiation from each radiation source has to be deflected separately onto the phosphor.

[0025] Preferably, a collecting mirror is provided for each block, onto which the excitation radiation or radiation from the radiation sources of the block is directed via the mirrors. The excitation radiation or radiation is initially coupled out, in particular approximately radially inward, and then directed, in particular axially, via the mirrors toward the collecting mirror, which then in turn directs it, in particular approximately radially inward, toward the dichroic mirror.

[0026] The at least one dichroic mirror is advantageously arranged, viewed in the direction of the main optical axis, axially at the same height as the collecting mirror and radially between the collecting mirror and the main optical axis. The at least one dichroic mirror can deflect the excitation radiation or radiation, advantageously onto the phosphor, and be transparent to conversion radiation. This has the advantage that several different radiation sources can radiate in different directions within the same section of the housing, since, for example, conversion radiation coupled out by the phosphor can radiate through the dichroic mirror. This allows the housing to be extremely small, thus enabling a more compact arrangement.

[0027] It is also conceivable to use at least one dichroic mirror without the mirror(s) and / or without the collecting mirror(s) to direct excitation radiation or radiation.

[0028] One or more lenses can be provided between the dichroic mirror and the phosphor. These lenses are advantageously arranged between the phosphor and the dichroic mirror, as viewed in the direction of the main optical axis. Advantageously, the lens(es) can shape, in particular focus, the excitation radiation deflected by the dichroic mirror onto the phosphor as required. In the process, the radiation can be refracted and / or scattered.

[0029] A dichroic mirror is preferably provided for each block or for each radiation channel. The excitation radiation can be directed to the dichroic mirror via the at least one mirror and / or the at least one collecting mirror, if required. At least one lens is then preferably assigned to each dichroic mirror or at least some of the dichroic mirrors. The multiple dichroic mirrors allow the excitation radiation to be distributed onto the phosphor over multiple spots, thereby enabling better cooling of the phosphor. The at least one dichroic mirror can redirect conversion radiation that has been converted by the phosphor to at least one further mirror.

[0030] The at least one further mirror can be provided between the dichroic mirror and the end face of the housing, viewed in the direction of the main optical axis. In a preferred embodiment, the at least one further mirror is configured as a single, in particular curved, in particular concavely curved, annular mirror. However, it is also conceivable for several individual mirrors to be provided that deflect the radiation or radiations. This further mirror or these further mirrors can advantageously deflect radiation onto an exit mirror.

[0031] The exit mirror is advantageously arranged on the main optical axis of the arrangement. In particular, the exit mirror can be arranged between the phosphor and the further mirror(s). The exit mirror can preferably be designed as an aspherical mirror. This can couple the radiation deflected by the further mirror(s) into a coupling surface of the integrator rod, in particular in a bundled manner. The combination of the aspherical mirror with the further mirror(s) leads to a compact design of the arrangement, particularly in the case of a plurality of dichroic mirrors or a plurality of blocks or radiation channels.

[0032] In particular, the converter directs conversion radiation and, if partial conversion is present, unconverted excitation radiation, particularly, axially via the dichroic mirror(s) to the additional mirror(s). This mirror(s) then reflects the radiation obliquely to the main optical axis inward toward the exit mirror. This, in turn, directs the radiation to the exit aperture or integrator rod and advantageously focuses it, allowing the exit mirror to be designed compactly.

[0033] The integrator rod is advantageously arranged on the main optical axis downstream of the exit mirror. The integrator rod can have the input coupling surface and an output coupling surface. Unconverted excitation radiation, in particular blue laser radiation, and converted conversion radiation, in particular yellow conversion light, which are bundled and deflected by the exit mirror, can be coupled into the input coupling surface. The coupled radiation can be mixed in the integrator rod and emitted as useful light, in particular white useful light, via the output coupling surface. The output coupling surface of the integrator rod can, as already mentioned above, represent the exit opening and / or, as viewed from the exit opening, be located inside or outside the housing. By mixing the excitation radiation and conversion radiation, a high luminance and a high luminous flux of the useful radiation can be generated.

[0034] The converter containing the phosphor can preferably be designed as a converter wheel. The converter wheel is advantageously rotatable. The converter wheel can, for example, have its center point on the main optical axis of the arrangement. It is possible to provide a motor unit in the housing, behind the converter wheel in the axial direction of the main optical axis, by which the converter wheel can be driven. A rotatable converter wheel has the advantage that the excitation radiation does not always radiate to the same spot. This allows for better dissipation of generated heat and increases the service life of the arrangement or individual components of the arrangement.Since, by means of at least one dichroic mirror, a coupling of non-converted excitation radiation in addition to the conversion radiation converted by the phosphor is possible, a closed construction of the converter wheel is possible without the need for a so-called "blue loop" which is common in the prior art and in which the excitation radiation is guided through an opening in the converter wheel in order to be able to provide non-converted radiation with the wavelength of the excitation radiation for the useful light.

[0035] At least one fan or multiple fans can be provided to cool the optical arrangement. The at least one fan can be provided behind the converter and / or behind the motor unit, viewed in the direction of the main optical axis, if a rotatable converter is arranged. The air outlet surface of the at least one fan can be arranged such that cooling air flows onto the side of the converter or the converter wheel facing away from the outlet opening. The cooling air can additionally or alternatively be guided through the arrangement past the converter. Additional cooling performance can be achieved by attaching cooling fins to one or more of the radiation sources or blocks, or to all radiation sources or blocks. These can be provided, for example, on a side facing away from a radiation exit surface of the radiation sources.The cooling fins can then be surrounded by the cooling air from at least one fan, for example, ensuring improved heat dissipation. This has the advantage that the heat generated at the radiation sources can be dissipated quickly and efficiently. This can increase the service life of the arrangement, especially the radiation sources.

[0036] The invention further provides a spotlight having the arrangement according to one or more of the aforementioned aspects. The spotlight is preferably intended for the entertainment sector.

[0037] Alternative areas of application can be, for example, spotlights for effect lighting, architainment lighting, general lighting, medical and therapeutic lighting, horticulture, etc.

[0038] The invention will be explained in more detail below using an exemplary embodiment. The figures show: Fig. 1 in a longitudinal section an optical arrangement according to an embodiment and Fig. 2 shows a perspective view of the optical arrangement according to the embodiment.

[0039] According to Fig. Figure 1 shows the optical arrangement according to the exemplary embodiment. It is designed approximately rotationally symmetrically around a main optical axis A. Blocks 1a, b, c, and d are provided, each of which contains a plurality of radiation sources 2, for example, laser diodes. The wavelength of the radiation from a laser diode can be, for example, 455 nm.

[0040] A block 1a, b, c, d has 8 radiation sources 2 arranged in a matrix in 2 columns and 4 rows. Two radiation sources 2 are provided in each row.

[0041] The blocks 1a, b, c, d are arranged rotationally symmetrically, approximately in a carousel-like manner, around the main optical axis A. The radiation sources 2 radiate radially in the direction of the main optical axis A. The radiation from any two blocks 1a, b or 1c, d can each be combined to form a radiation channel. In the present embodiment of the arrangement, eight radiation channels are provided. One radiation channel is represented, for example, by blocks 1a, b, and another radiation channel by blocks 1c, d.

[0042] In the following, a radiation channel will be described which has the two blocks 1a, b.

[0043] The excitation radiation emitted by the radiation sources 2 of blocks 1a, b in the radial direction of the main axis A strikes a mirror 4. The radiation from each of two radiation sources 2 radiates onto one mirror 4 each. Four mirrors 4 are therefore provided for each block 1a, b. The mirrors 4 are then arranged such that they each deflect the excitation radiation from the two radiation sources 2, which is radiated in the radial direction of the main axis A, in the axial direction of the main axis A onto a collecting mirror 6. For this purpose, the mirrors 4 are arranged in the arrangement, viewed radially from the main axis A, between the main axis A and the blocks 1a, b.

[0044] The collecting mirror 6 is arranged in such a way that, viewed from the main axis A, it lies in the axial direction between the two blocks 1a, b of a radiation channel, and in the radial direction between the main axis A and the blocks 1a, b. The collecting mirror 6 collects the excitation radiation from the radiation sources 2 emitted by the mirrors 4 in the axial direction of the main axis A and redirects it in the radial direction of the main axis A onto a dichroic mirror 8. This allows excitation radiation from multiple radiation sources 2 to be combined into the radiation channel.

[0045] For simplicity, the collecting mirror 6 is viewed here as a single mirror. However, according to the embodiment, the collecting mirror 6 is provided as a mirror arrangement. At least two mirrors or mirror surfaces are arranged such that they reflect the radiation from the blocks 1a, b, which is directed from opposite directions by the mirrors 4 in the axial direction of the main axis A, onto the collecting mirror arrangement, in a radial direction of the main axis A. For this purpose, the at least two mirrors can be arranged approximately in a cross shape. In the present exemplary embodiment, the arrangement for the collecting mirror 6 has four individual mirror surfaces or mirrors. Arrangements with more mirror surfaces or mirrors are also conceivable.

[0046] The dichroic mirror 8 is arranged, as seen from the main axis A, axially at the same height as the collecting mirror 6, and radially between the collecting mirror 6 and the main axis A.

[0047] The dichroic mirror 8 then reflects the excitation radiation emitted by the radiation sources 2, but is transparent to conversion radiation, which is explained further below. The dichroic mirror 8 directs the excitation radiation via two lenses 10 in the axial direction of the main axis A onto a phosphor 12. The phosphor 12 is arranged perpendicular to the main optical axis A. The lenses 10 are designed to focus the radiation reflected by the dichroic mirror 8 onto the phosphor 12.

[0048] In the phosphor 12, the excitation radiation is at least partially converted into conversion radiation. The phosphor 12 is preferably designed as part of a reflective converter, so that at least the conversion radiation is subsequently reflected by the phosphor 12 back to the dichroic mirror 8. The dichroic mirror 8 is transparent to the conversion radiation, which then radiates further to a mirror designed as an annular mirror 14. The annular mirror 14 extends around the main axis A and is concavely curved. Viewed in the axial direction of the main axis A, it is spaced from the phosphor 12 such that the dichroic mirror 8 is arranged between the annular mirror 14 and the phosphor 12. The annular mirror 14 can focus radiation reflected by the converter and redirect it onto an exit mirror 16.The exit mirror 16 is preferably designed as an aspherical mirror. It is located in the center of the arrangement on the main axis A and directs the incident radiation onto a coupling surface 20 of an integrator rod 18.

[0049] The integrator rod 18 is also provided on the main axis A and is connected downstream of the exit mirror 16. In the integrator rod 18, the incident radiation is bundled and emitted as useful radiation via an output surface 22.

[0050] For this purpose, in addition to the radiation channel that combines the radiation from the radiation sources 2 from blocks 1a, b, at least one of the further radiation channels of the arrangement, represented here by blocks 1c, d, can be provided such that the radiation from the radiation sources 2 does not radiate onto the phosphor and is thus not converted. For this purpose, for example, no dichroic mirror 8 can be provided in the radiation channel, but rather a mirror that directs the additional radiation from the radiation sources 2 of blocks 1c, d directly onto the annular mirror 14. The annular mirror 14 thus deflects conversion radiation from the phosphor 12 and unconverted additional radiation from a radiation channel with blocks 1c, d onto the exit mirror 16, which couples the radiation into the integrator rod 18.

[0051] In the integrator rod 18, the incident radiation, i.e. the non-converted additional radiation, preferably blue laser radiation, and the conversion radiation, preferably yellow conversion light, are then mixed to form useful radiation, preferably white useful light, which is emitted from an output surface 22 of the integrator rod 18.

[0052] In a preferred embodiment, the arrangement is provided in a housing 26, in particular an approximately cylindrical one, which is schematically indicated by a dashed line in the figure. The housing can simply be designed as a structure that fixes the components of the arrangement. The output surface 22 of the integrator rod 18 can be arranged centrally in an end face 28 of the housing 26. It is also conceivable for the output surface 22 of the integrator rod 18 to be located inside or outside the housing, with the useful radiation nevertheless being emitted via an exit opening on the end face 28 of the housing 26. The housing 26 can be provided in a headlight 30, which is also represented by the dashed line.

[0053] Fig. 2 shows an overall view of the optical arrangement in the same embodiment as Fig.1. Here, the eight radiation channels can be seen, each of which has two blocks 1a, b with the radiation sources 2, mirrors 4, a collecting mirror 6, a dichroic mirror 8, two lenses 10, the phosphor 12, the ring mirror 14, the aspherical mirror 16 and the integrator rod 18.

[0054] Disclosed is an optical arrangement for a Laser Activated Remote Phosphor (LARP) system which is provided in an approximately cylindrical housing and which has at least two radiation sources which are arranged in a circle in a circumferential direction of a main optical axis in the housing around a phosphor and in which the phosphor has a plurality of incidence areas. LIST OF REFERENCE SYMBOLS A Optical principal axis 1a, b, c, d Block 2 Radiation source 4 mirrors 6 collecting mirrors 8 dichroic mirrors 10 lenses 12 fluorescent 14 ring mirrors 16 exit mirrors 18 Integrator rod 20 coupling area 22 Decoupling area 26 housings 28 Front side 30 headlights

Claims

[1] Optical arrangement for a Laser Activated Remote Phosphor (LARP) system with a housing (26) in which a plurality of blocks (1a, 1b, 1c, 1d) are arranged, each having at least two radiation sources (2), via which an excitation radiation can be emitted, and in which a phosphor (12) is provided for at least partially converting the excitation radiation into conversion radiation, wherein the conversion radiation forms at least part of a useful radiation that can be emitted via an exit opening of the housing (26), wherein the plurality of blocks (1a, 1b, 1c, 1d) are arranged in the circumferential direction of a main optical axis (A) of the arrangement and surround the main optical axis (A) in a rotationally symmetrical manner, and wherein the at least two radiation sources (2) of each of the plurality of blocks (1a, 1b, 1c, 1d) are arranged along a direction parallel to the main optical axis (A). [2] Optical arrangement according to claim 1, wherein an end face (28) of the housing (26) is encompassed by a lateral surface of the housing (26) which extends circumferentially around the main optical axis (A), the main optical axis (A) being arranged approximately centrally of the lateral surface. [3] Optical arrangement according to claim 2, wherein the exit opening of the useful radiation lies on the main optical axis (A) and is provided approximately centrally in the end face (28) of the housing (26). [4] Optical arrangement according to one of claims 1 to 3, wherein a mirror (4) or a plurality of mirrors (4) is / are provided, by which an excitation radiation or at least a part of the excitation radiation can be deflected. [5] Optical arrangement according to one of claims 1 to 4, wherein at least one collecting mirror (6) is provided which directs excitation radiation from the at least two radiation sources (2) to a dichroic mirror (8) which reflects the excitation radiation towards the phosphor (12), wherein the dichroic mirror (8) is transparent to the conversion radiation. [6] Optical arrangement according to claim 5, wherein the collecting mirror (6) and the dichroic mirror (8) are arranged radially with respect to the main optical axis (A) inward of the at least two radiation sources (2) whose excitation radiation they reflect or wherein the collecting mirror (6) and the dichroic mirror (8) are arranged between the exit opening and the phosphor (12) as seen in the direction of the main optical axis (A). [7] Optical arrangement according to one of claims 1 to 6, wherein a lens (10) or a plurality of lenses (10) is / are provided which shapes the at least one excitation radiation and / or the conversion radiation. [8] Optical arrangement according to one of claims 1 to 7, wherein at least one further mirror (14) is provided which directs at least the conversion radiation towards an exit mirror (16), which in turn directs the conversion radiation towards the exit opening. [9] Optical arrangement according to claim 8, when dependent on claim 5 or 6, wherein the further mirror (14) is provided between the dichroic mirror (8) and the end face (28) of the housing (26) and / or is arranged circumferentially around the main optical axis (A). [10] Optical arrangement according to one of claims 8 to 9, wherein the exit mirror (16) is arranged between the further mirror (14) and the phosphor (12) as seen in the main optical axis (A) and / or in the direction of the main optical axis (A). [11] Optical arrangement according to one of the preceding claims, wherein at least one further radiation source (2) is provided, the radiation of which is not converted via the phosphor (12) and is guided to the exit opening in the end face (28) of the housing (26). [12] Optical arrangement according to one of the preceding claims when dependent on claim 5, 6 or 9, wherein at least two blocks (1a, 1b, 1c, 1d) are arranged one behind the other as seen in the direction of the main optical axis (A), and wherein the at least one collecting mirror (6) and / or the at least one dichroic mirror (8) is / are arranged in the direction of the main optical axis (A) between the blocks and radially inward of the blocks (1a, 1b, 1c, 1d) with respect to the main optical axis (A). [13] Optical arrangement according to one of claims 1 to 7, wherein an integrator rod (18) is provided at least for the conversion radiation. [14] Headlight with an optical arrangement according to one of the preceding claims.

Images