DE102014203245A1 - Lighting device of a motor vehicle - Google Patents

Abstract

The invention relates to a lighting device (10) of a motor vehicle. The illumination device (10) comprises at least one semiconductor light source (26) for emitting primary light (24) of a first wavelength and at least one spaced apart from the at least one semiconductor light source (26) and in the beam path of the primary light (24) emitted by the at least one semiconductor light source (26) ) arranged wavelength converter (28) which converts the primary light (24) into secondary light (32) of at least one other wavelength. It is proposed that the wavelength converter (28) has at least two different luminescent dyes which divide the primary light (24) emitted by the at least one semiconductor light source (26) into secondary light (32) of at least two different, each of the wavelength of the primary light (24) Convert wavelengths.

Description

The present invention relates to a lighting device of a motor vehicle. The illumination device comprises at least one semiconductor light source for emitting primary light of a first wavelength and at least one wavelength converter spaced from the at least one semiconductor light source and arranged in the beam path of the primary light emitted by the at least one semiconductor light source, which converts the primary light into secondary light of at least one other wavelength.

Various lighting devices for motor vehicles are known from the prior art. How to distinguish between headlights and lights. Headlamps are located in the front of a vehicle. They serve in addition to road safety by visualizing the vehicle for other road users in particular the illumination of the road ahead of the vehicle, in particular by a light distribution in the form of low beam, high beam, fog light or any other, for example. Adaptive light distribution (eg city lights, motorway lights, Teilfernlicht , Marker light, etc) to improve the visibility for the driver of the vehicle.

Lights are mainly used for traffic safety by visualizing the vehicle for other road users. Thus, front lights are used in the front of the vehicle, for example, as a white-lit daytime running or limiting or position light, or as a flashing yellow flashing light. Tail lights are used in the rear of a vehicle, for example, as a red glowing brake light, tail light, rear fog light, as white backlit or flashing yellow flashing light. The front lights can be integrated in a headlight or formed as a separate lights and arranged in the front of the vehicle. A luminaire can fulfill one or more luminaire functions. In a tail light usually several lighting functions are integrated.

In lighting devices of motor vehicles, in which the light source as semiconductor light sources, e.g. As light-emitting diodes (LEDs) are realized, currently LED chips with housing (so-called LED packages) or unpackaged LED chips on printed circuit boards (so-called chip-on-board technology) are used. The light distributions for illuminating the road in front of a motor vehicle usually have (at least in Germany required by law) a white color. In the case of headlamps with semiconductor light sources, LEDs are usually used which emit blue light or UV radiation that falls on a wave converter and is converted into light of a different color. The desired white light results from additive mixing of the spectral colors of the radiation emitted by the LEDs and the converted light. When using blue LEDs, the converter generates yellow light, with additive color mixing of blue and yellow light producing white light. As a yellow luminescent dye, for example, phosphorus or cerium-doped yttrium-aluminum garnet (YAG: Ce3 +) is used. When using UV LEDs, a converter generates red, green and blue light, with additive color mixing of the converted red, green and blue light giving white light.

The DE 10 2011 081 919 A1 shows a lighting device of a motor vehicle, in which a material with wavelength-converting properties is arranged spatially separated from a light source. The material is arranged in or on a light beam-shaping element of the illumination device and serves to convert part of the light emitted by the light source of a particular color into another color. Additive color mixing of the light emitted by the light source and the converted light results in a light color of the resulting light distribution (eg, blue and yellow light results in white light) emitted from the illumination device.

The luminescent dye of a wavelength converter is easily visible from outside when the semiconductor light sources are turned off due to the clear cover lenses frequently used in modern lighting devices, which close a light exit opening of a housing of the illumination device without optically active elements (e.g., cylindrical lenses, prisms). This is the case in particular if so-called remote converters are used, which are arranged at a distance from the semiconductor light source. If the illumination device also has a lens, as is often the case, for example, with headlights according to the projection principle, the luminescence dye of a wavelength converter is made even more visible. Overall, this results in an unsatisfactory visual appearance of the switched-off lighting device (so-called fried egg effect). It is sometimes attempted to mask the yellow appearance of the luminescence converter, which is very complex and can affect the efficiency of the lighting device.

Based on the described prior art, the present invention has the object to design a lighting device of the type mentioned in such a way and further that despite use a wavelength converter, a desired external appearance of the switched-off lighting device can be achieved. In particular, a possibility should be created to adjust the color of the visible from the outside wavelength converter with the lighting device off in the desired manner.

To solve the problem is proposed starting from the illumination device of the type mentioned that the wavelength converter has at least two different luminescent, which convert the emitted from the at least one semiconductor light source primary light in secondary light at least two different, each deviating from the wavelength of the primary wavelengths and the at least on a part of a carrier element arranged in the beam path are applied flat in at least one layer or introduced into the carrier element.

According to the invention, it is therefore proposed to use not only one luminescent dye of a specific color but a plurality of, preferably differently colored, luminescent dyes for a wavelength converter. The color of the luminescent dye is understood to be the color which the dye has for the viewer when semiconductor light sources are switched off, i. when only ambient light falls on the luminescent dye. Each of the luminescent dyes converts the primary light emitted by the at least one light source into secondary light of a wavelength deviating from the wavelength of the primary light. Preferably, the wavelengths of the secondary light generated by the different luminescent dyes differ from each other.

The luminescent dyes are applied in at least one layer in a planar manner on a carrier element arranged in the beam path or - in the case of a transparent carrier element - introduced into this. By skillful selection, design and combination of the various luminescent dyes can be achieved that the emitted from the semiconductor light source electromagnetic radiation (primary light) is converted into secondary light of different colors and additive color mixing of different colored secondary light or primary and secondary light, a desired light color of the resulting light distribution the lighting device is achieved. A particular advantage is thus that with the wavelength converter according to the invention by a suitable mixture of different luminescent dyes with the lighting device turned on light of almost any color can be generated.

Preferred colors of the luminescent dyes are red and green. Depending on the type of light source, a blue luminescent dye may also be used. The dyes are preferably applied in layers to the carrier element, whereby a layer can also consist of a mixture of different luminescent dyes.

If the luminescent dyes are applied as a mixture in a layer on a carrier element or introduced into this, results in a switched off semiconductor light sources, a color impression of the wavelength converter by a color mixing of the colors of the different luminescent. In this way, almost any color impression of the switched-off lighting device can be generated. Thus, the particular configuration of the wavelength converter becomes an important design element that significantly influences the impression that a viewer has of the switched off illumination device.

The luminescent dyes are preferably applied in layers one above the other onto a carrier element. By skillful selection, design and combination of different layers (eg layer thickness, material, etc.) can be achieved that the emitted from the semiconductor light source electromagnetic radiation (primary light) is converted into secondary light of different colors and additive color mixing of the different colored secondary light or the primary - And secondary light, the desired light color of the resulting light distribution of the lighting device is achieved.

At the same time can be achieved by skillful arrangement of the various layers that adjusts a desired appearance of the wavelength converter in a view from the outside into the interior of the illumination device. This can be achieved, for example, in that the uppermost layer of a luminescent dye produces a desired color effect of the switched-off illumination device when the illumination device is switched off, either alone or in combination with at least one underlying layer of another luminescent dye. For example, it would be conceivable to design at least one luminescent dye layer or a layer of a dye mixture arranged on another luminescent dye layer to be partially transparent, so that the underlying layer is visible through the upper layer. A color impression of the wavelength converter with the illumination device switched off then results from additive color mixing of the colors of the two Layers. By varying the degree of partial transparency, a desired color impression can be achieved.

Furthermore, due to the partial transparency of an upper luminescent dye layer applied to a different luminescent dye layer, it is ensured that the primary light of the at least one light source can strike the luminescent dyes of all layers as desired and can be converted into the differently colored light. Again, by varying the partial transparency of the different luminescent dye layer, the light color of the resulting light of the illumination device can be adjusted (e.g., warm white, cool white, etc.).

A wavelength converter can convert light of a first wavelength only into light of a longer wavelength, that is, into lower-energy light. This means in particular that a conversion of the light by means of a wavelength converter is possible only in a lower-energy light (for example UV -> violet -> blue -> green -> yellow -> orange -> red).

According to the invention, it is provided that the different luminescent dyes are formed in such a way that light beams of a desired color are produced by a respectively selected luminescent dye. In this way, light beams in at least two different colors, ie polychromatic light, are emitted from the illumination device. It is also possible that a part of the primary light generated by the at least one light source does not strike a luminescent dye and thus is not converted. The unconverted primary light also leaves the illumination device and is then part of the polychromatic light.

The luminescent dye can be applied in different ways to a carrier element. The carrier element may be a component which is present anyway in the illumination device or an additionally provided component. The carrier element may be transparent or opaque. The luminescent dye or the dye mixture can be applied to the carrier element as a suspension in a hardening medium or as a powder. It is conceivable that a partial transparency of a layer of a luminescent dye or a dye mixture is given by the wavelength-converting material per se or is achieved by a certain type of application. For this purpose, the luminescent dye or the dye mixture can be applied, for example, particularly thinly or else in a lattice structure or another structure which allows the primary light to pass through interspaces in the layer to the underlying layer of another luminescent dye.

The various luminescent dyes convert the primary light (e.g., UV or blue light) into secondary light of different colors. Additive color mixing of the different colors of the secondary light or of the primary and secondary light results in the desired light color of the resulting light distribution of the illumination device. For example, it is conceivable that blue primary light is converted by the various luminescent dyes into green and red light. An additive color mixture of the blue primary light and the red and green secondary light then gives the desired white light. Likewise, it is conceivable that ultraviolet primary radiation is converted by the various luminescent dyes into red, green and blue secondary light. An additive color mixture of the red, green and blue secondary light then gives the desired white light. Of course, any other colors of the secondary light are conceivable to produce a resulting light distribution of a different color from white, for example, red or orange or amber light. In a specific application, for example, the semiconductor light source could emit UV radiation, a first luminescent dye with wavelength-converting properties being arranged in the beam path, which converts the UV radiation into a red light and arranges a second luminescent dye with wavelength-converting properties in the beam path of the UV radiation is that converts the UV radiation into a green light. Additively mixed, a yellow or orange or amber light thus results from the resulting light distribution, which is e.g. can be used to realize a flashing light.

In a preferred embodiment of the invention, it is provided that an uppermost layer of a luminescent dye which is visible from outside the illumination device, in particular with respect to the color of the layer when the semiconductor light sources are switched off, is selected such that the visible layer effects a desired optical impression on the viewer. No particular order of the individual luminescent dyes is required to produce a desired color of the resulting light. For additive color mixing, it is irrelevant whether one luminescent dye is applied to the other or vice versa. This results in the advantage that the topmost layer visible from outside the illumination device can be chosen such that it generates the desired visual impression when the illumination device is switched off. In particular, the luminescent dye of the uppermost, externally visible layer can be selected such that it matches the design of the lighting device or the vehicle body in a visually appealing color.

For example. it is possible to adapt the color of the externally visible layer of the color of the vehicle body, or at least to produce an appealing overall appearance together with the vehicle paint. For example, the upper, visible layer in the interior of the illuminator could appear blue, green, or red. The visual appearance can be significantly improved in contrast to the known yellowish converter. It can also be created a characteristic feature for a particular vehicle type.

It is also possible that the luminescent dyes or dye mixtures having different wavelength-converting properties are arranged on a common surface but in mutually adjacent segments of the carrier element. This means that the layers with the wavelength-converting properties in the beam path of the light are not arranged one behind the other, but side by side, ie laterally offset from one another. This can e.g. bring manufacturing advantages. Thus, for example, it is conceivable to arrange two different luminescent dyes or dye mixtures on a carrier element in a checkerboard pattern. The areas of the individual segments can be chosen so small that results in a look at the support element from the outside a uniform color. Likewise, when the semiconductor light sources are switched on, the carrier element appears as a surface which is luminous in a uniform color, the color resulting from the additive color mixing of the primary and / or secondary light of different colors. However, it is also conceivable that the areas of the individual segments are deliberately chosen so large that they can be perceived when the semiconductor light sources are switched off when viewed from the outside in order to produce a conspicuous visual appearance of the illumination device in the switched-off state. When switched on, the illumination device should emit light of a uniform color even with larger-area segments.

In addition, it is conceivable that the luminescent dyes of the wavelength converter can be placed on or in optically effective, i. the passing light beams forming elements of the illumination device are arranged. Such an element may, for example, be a front lens made of a transparent material for bundling the light emitted from a semiconductor light source by total reflection, a reflection surface of a reflector, a secondary optic (e.g., a condenser lens), or a cover plate. All of these elements are suitable for arranging the luminescent dyes appropriately thereon.

Alternatively, it can be provided that the wavelength-converting material is introduced into at least one light-transmissive disk arranged in the beam path or applied to the disk. The translucent disk is preferably introduced into the beam path only for the wavelength converter. The disk thus represents a separately formed converter unit which can decisively influence the external appearance of the lighting device.

In particular, when using the translucent disk with the wavelength-converting material, it is possible that at least one layer arranged in the beam path of the light with wavelength-converting properties comprises means for diffusing the light. The means may e.g. small crystals are included, which are additionally introduced into the layer with the wavelength-converting properties. By the scattering, for example, the additive color mixing of the primary and / or secondary light can be promoted.

In the illumination device according to the invention, it is further provided that the at least one semiconductor light source emits ultraviolet light or blue light. The UV or the blue light is a relatively high-energy light in the light spectrum, which allows a conversion of the light in a variety of other colors. In particular, a secondary light in the colors green, yellow, orange and red can be generated. By means of additive color mixing, the colors for realizing the headlamp and luminaire functions (white, yellow and red) can be produced in the illumination device according to the invention. Semiconductor light sources emitting blue light also have a particularly high efficiency.

Further features and advantages of the present invention will be explained in more detail below with reference to the figures. They show, in each case in a schematic representation:

1 a lighting device according to the invention in a first embodiment in a longitudinal section;

2 an enlarged sectional view through the reflector of the illumination device 1 ;

3 a lighting device according to the invention in a second embodiment in a longitudinal section; and

4 a lighting device according to the invention in a third embodiment in a longitudinal section.

1 shows a lighting device according to the invention 10 in a first embodiment in a longitudinal section. The lighting device shown 10 is designed as a motor vehicle headlight. Of course, it would also be conceivable, the lighting device 10 to design as a tail lamp or other lamp of a motor vehicle. The lighting device 10 includes a housing 12 , which is preferably made of plastic. In a light exit direction 14 has the housing 12 via a light exit opening, which by means of a cover 16 made of a translucent material, in particular of glass or plastic, is closed. The cover 16 can be formed without a visually effective profiles as a clear disc or at least partially with optically effective profiles, for example. In the form of prisms, cylindrical lenses or Fresnel lenses, be provided for scattering the light passing through.

Inside the lighting device 10 is a light module 18 arranged. Of course, it is conceivable that in the housing 12 also a plurality of light modules are arranged. The light module 18 is preferably designed to realize at least one luminaire function.

Luminaire functions in the front area of a vehicle can be, for example, a white-lit daytime running light or position light, or a flashing yellow flashing light. In the rear area, lighting functions represent, for example, a red glowing brake light, tail light or rear fog light, a white backlight or a flashing yellow flashing light. In the housing 12 the lighting device according to the invention 10 but can also be arranged headlight modules.

The light module 18 has one as a reflector 20 trained primary optics, which is preferably parabolically shaped. The reflector 20 but could also have any free form. The reflector 20 reflected on its reflection surface 22 light rays 24 a semiconductor light source 26 , which preferably comprises at least one light-emitting diode. The light source could also be designed as a light bulb or gas discharge lamp. That from the light source 26 In the following, emitted light is called a primary light 24 designated.

The reflection surface 22 the lighting device 10 is with a wavelength-converting material 28 (so-called wavelength converter) coated, that of the primary light 24 is illuminated. A detailed description of the wavelength-converting material 28 shows 2 wherein the wavelength-converting material 28 without curvature of the reflecting surface of the reflector 20 is shown. The wavelength converting material 28 comprises at least two different luminescent dyes applied in layers one above the other.

The wavelength converting material 28 is in 2 in three translucent panes 30 . 30 ' . 30 '' introduced, with the discs 30 . 30 ' . 30 '' are arranged directly one above the other. It is even conceivable that the discs 30 . 30 ' . 30 '' are combined into a single disc, in which the various luminescent dyes are introduced in layers. Of course, it would also be conceivable that the various luminescent dyes are mixed (not in layers) are introduced into a single disc. In this case, the luminescent dye of the wavelength-converting material 28 in the form of particles or powder in a disk 30 . 30 ' . 30 '' brought in. It is also possible that the various layers of the luminescent dyes of the wavelength-converting material 28 directly on the reflection surface of the reflector 20 are applied.

In the illustrated embodiment, each disc 30 . 30 ' . 30 '' a luminescent dye with wavelength-converting properties, which differ from the wavelength-converting properties of the other discs. The luminescent dye has the ability to emit the emitted primary light 24 in secondary light 32 one of the color of the primary light 24 to convert different color. Every disc 30 . 30 ' . 30 '' So converts the primary light 24 in secondary light 32 a different color. The secondary light 32 is therefore a polychromatic light, which is made up of differently colored light. The polychromatic light becomes after additive color mixing from outside the illumination device 10 perceived as the light of a single color. For example, superimposed blue primary light and yellow secondary light to a white light of the resulting light distribution of the lighting device 10 , Likewise, for example, red, green and blue secondary light to a white light of the resulting light distribution of the illumination device 10 add.

In addition, at least one slices 30 . 30 ' . 30 '' Include means for scattering the light. This could, for example, under a powdered wavelength-converting material 28 mixed small crystals and slices 30 . 30 ' . 30 '' be introduced.

In a first exemplary application, the at least one semiconductor light source could 26 UV light as primary light 24 send out. In the beam path of the primary light 24 is the first disc 30 arranged with a first luminescent dye, the UV light from a blue secondary light 32 generated, the second disc 30 ' arranged with a second luminescent, which from the UV light, a green secondary light 32 generated, and the third disc 30 '' arranged with a third luminescent dye, the UV light from a red secondary light 32 generated. Additive mixed arises from the differently colored secondary light 32 a white light that can be used, for example, for the realization of a daytime running light, a position or limiting light or a reversing light. In an alternative embodiment, a mixture of different luminescent dyes in a disk could also be used 30 come into use.

In a second application, only two layers of a luminescent dye or two slices 30 and 30 ' be provided. The semiconductor light source 26 also sends UV light as primary light 24 out. In the beam path of light creates the first disc 30 with a first luminescent from the UV light, a green secondary light 32 , the second disc 30 ' with a second luminescent dye generates a red secondary light 32 , Additively mixed, a yellow or orange or amber-colored light thus results in the resulting light distribution of the illumination device 10 , which can be used for example to realize a flashing light.

In a third application, only two layers of a luminescent dye or slices could also be used 30 and 30 ' be provided. The semiconductor light source 26 sends blue light as primary light 24 out. In the beam path of the primary light 24 produces the first slice 30 with a first luminescent from the blue light, a green secondary light 32 , the second disc 30 ' with a second luminescent dye generates a red secondary light 32 , In the slices 30 and 30 ' For example, the material with different wavelength-converting properties is introduced in the form of particles, so that it is possible to use part of the primary light 24 unconverted the two layers 30 and 30 ' penetrates or is reflected by a reflection surface arranged behind it. In the context of additive color mixing to produce the color of the resulting light distribution, the blue primary light 24 with the red and the green secondary light 32 mixed. Additive mixed creates a white light.

In additive color mixing, an order of the layers with the different luminescent dyes or slices is 30 . 30 ' and 30 '' without meaning. However, it should be noted that when the light source is turned off 26 when viewed from the outside through the cover 16 through into the interior of the housing 12 the topmost layer or disc 30 ' (with two different luminescent dyes) or 30 '' (at three different luminescent dyes) is visible. This results in the possibility that the particular layer or the luminescent dye is arranged as the top, which has a desired color and through which a desired visual impression, in particular with regard to the color of the wavelength converter 28 , can be evoked in the viewer. In the examples mentioned, the uppermost layer may, for example, comprise a red, green or blue luminescent dye or a mixture of different colored luminescent dyes.

3 shows the illumination device according to the invention 10 in a second embodiment in a longitudinal section. At the same time, light becomes a light source 26 with a divergent light beam on a front optics 34 directed. The intent optics 34 produces a light beam with less divergence. When the light passes through the attachment optics 34 this is not only bundled, but changed by additive color mixing in its color, so that from the intentional optics 34 emerging mixed light has a desired color, resulting from the type and amount of in or on the attachment optics 34 used luminescent.

Unlike the first embodiment ( 1 ) has the light module 18 as the intent optics 34 trained primary optics. The intent optics 34 consists of a transparent plastic or glass material and causes a bundling of the light source 26 emitted light rays by refraction at light entrance and / or light exit surfaces of the attachment optics 34 and / or by total reflection at interfaces. At the light exit surface of the attachment optics 34 is the wavelength converting material 28 Applied in layers. The wavelength converting material 28 is according to the description too 2 educated. The light module 18 otherwise works according to the comments on the 1 and 2 , In the second embodiment, the wavelength-converting material could 28 alternatively also at the light entry surface of the attachment optics 34 arranged and / or in the material of the attachment optics 34 be introduced. In this context, any combinations are conceivable. It is crucial that different luminescent dyes, which in the unlit state (with light sources switched off) preferably have a different color, for the wavelength converter 28 be used. Of course, it would also be conceivable that the wavelength-converting material 28 not in layers, but as a mixture in a single layer on the light entrance or the light exit surface of the attachment optics 34 is applied.

4 shows the illumination device according to the invention 10 in a third embodiment in a longitudinal section. At the same time, light becomes a light source 26 with a divergent light beam on the reflector 20 directed. The light source 26 is preferably in the focal point of the reflector 20 arranged. The reflector 20 generates a light beam with less divergence, which in its further course arranged in the beam path lens 36 evenly lit. The lens 36 in turn, then uniformly illuminates with a desired color resulting from the type and amount of luminescent dyes used.

Unlike the first embodiment ( 1 ) has the light module 18 a reflector 20 on, its reflection surface 22 not with the wavelength converter 28 is coated. Instead, in the beam path of the at the reflection surface 22 reflected light to the reflector 20 spaced apart a converter unit formed by the at least one lens 36 arranged. The converter unit 36 includes two translucent discs 30 . 30 ' in which the wavelength-converting material 28 introduced with the different luminescent dyes, each having different wavelength-converting properties or on which the wavelength-converting material 28 is applied. Again, only a translucent disc can be provided, in which the various luminescent dyes are applied in layers or mixed accordingly. Of course, it would also be conceivable here that the wavelength-converting material 28 not in layers, but as a mixture in a single layer on one or more translucent panes 30 . 30 ' is applied. The light module 18 otherwise works according to the comments on the 1 and 2 , The converter unit 36 can alternatively also three discs 30 . 30 ' . 30 '' each having different wavelength converting properties. Of course, in this embodiment, the primary optics could alternatively also be used as attachment optics (cf. 3 ) be formed. In an alternative embodiment, the luminescent dyes may be on a transparent pane 30 be applied as a coating.

In a further, not shown embodiment, the wavelength converting material 28 also in layers on an inside or outside of the cover 16 be arranged. This could be the arrangement of the wavelength converter 28 on a specific area of the cover 16 be limited. It would also be conceivable that the wavelength-converting material 28 in a part or all of the material of the cover 16 be introduced.

In a particularly preferred embodiment of the illumination device 10 out 4 consists of the wavelength converter 28 from a mixture of red, green and blue luminescent dye. The mixture is preferably applied as a layer to a transparent pane arranged in the beam path 30 ; 30 ' applied. The light source 26 It emits preferably UV radiation (between visible to human light and X-rays, wavelengths about 10-400 10 ^-9 m) from. The proportions of the differently colored luminescent dyes in the converter 28 are preferably chosen so that the disc 30 ; 30 ' or the mixture of different colored luminescent dyes applied thereto with the light source switched off 26 white appears, and that the converter 28 when the UV light source is switched on 26 emits white light (additive color mixing of red, green and blue light).

If, in the context of the invention, a particular color of a luminescent dye is mentioned, then the color of the dye is when the light source is switched off 26 the lighting device 10 meant. At best, ambient light from outside falls on the converter 28 and the luminescent dye (s) or mixture of differently colored luminescent dyes appears to the viewer in a particular color. However, the color of the luminescent dyes is independent of the color of the light, which is when exposed to the luminescent dyes with electromagnetic radiation of the light source 26 is emitted by these, especially the color of the emitted light and the wavelength of the impinging radiation of the light source 26 depends. But it is quite possible that a luminescent dye when exposed to electromagnetic radiation from the light source 26 emitted with a certain wavelength, emits light in the same color as when the luminescent dye is exposed from the outside with sunlight.

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• DE 102011081919 A1 [0005]

Claims (15)

Lighting device ( 10 ) of a motor vehicle, comprising at least one semiconductor light source ( 26 ) for emitting primary light ( 24 ) of a first wavelength and at least one to the at least one semiconductor light source ( 26 ) and in a beam path of the of the at least one semiconductor light source ( 26 ) emitted primary light ( 24 ) arranged wavelength converter ( 28 ), the primary light ( 24 ) in secondary light ( 32 ) converts at least one other wavelength, characterized in that the wavelength converter ( 28 ) has at least two different luminescent dyes, which the from the at least one semiconductor light source ( 26 ) emitted primary light ( 24 ) in secondary light ( 32 ) of at least two different, each of the wavelength of the primary light ( 24 ) convert different wavelengths and the at least a part of a beam element arranged in the beam path ( 20 . 34 . 36 ) applied in at least one layer surface or in the carrier element ( 20 . 34 . 36 ) are introduced. Lighting device ( 10 ) according to claim 1, characterized in that the different luminescent dyes have different colors. Lighting device ( 10 ) according to claim 2, characterized in that when the semiconductor light sources ( 26 ) a color impression of the wavelength converter ( 28 ) is formed by a color mixture of the colors of the different luminescent dyes. Lighting device ( 10 ) according to one of claims 1 to 3, characterized in that the different luminescent dyes are applied in layers one above the other. Lighting device ( 10 ) according to claim 4, characterized in that a first layer of a first luminescent dye which is applied to another layer of another luminescent dye, for which of the at least one semiconductor light source ( 26 ) emitted primary light ( 24 ) is partially transparent. Lighting device ( 10 ) according to claim 4 or 5, characterized in that when the semiconductor light sources ( 26 ) a color impression of the wavelength converter ( 28 ) is formed by the color of the uppermost luminescent dye. Lighting device ( 10 ) according to any one of claims 1 to 6, characterized in that the luminescent dyes all of the at least one semiconductor light source ( 26 ) emitted primary light ( 24 ) in secondary light ( 32 ) of wavelengths other than the wavelength of the primary light ( 24 ) and the resulting light color of the illumination device ( 10 ) emitted light by an additive mixture of the spectral colors of the secondary light ( 32 ). Lighting device ( 10 ) according to any one of claims 1 to 6, characterized in that the luminescent dyes only a part of the at least one semiconductor light source ( 26 ) emitted primary light ( 24 ) in secondary light ( 32 ) of wavelengths other than the wavelength of the primary light ( 24 ) and the resulting light color of the illumination device ( 10 ) emitted light by an additive mixture of the spectral colors of the unconverted part of the primary light ( 24 ) and the secondary light ( 32 ). Lighting device ( 10 ) according to one of claims 1 to 8, characterized in that the at least two different luminescent dyes at least on a part of a reflection surface of a reflector ( 20 ) of the lighting device ( 10 ) are applied. Lighting device ( 10 ) according to one of claims 1 to 7, characterized in that the at least two different luminescent dyes in a light path arranged in the beam path ( 36 ) or on a translucent disc ( 36 ) are applied. Lighting device ( 10 ) according to one of claims 1 to 7, characterized in that the at least two different luminescent dyes in a arranged in the beam path intent optics ( 34 ), which consists of a transparent plastic or glass material and a bundling of the at least one semiconductor light source ( 26 ) emitted light beams introduced or on a light entrance and / or light exit surface of the optical attachment ( 34 ) are applied. Lighting device ( 10 ) according to one of the preceding claims, characterized in that the at least one semiconductor light source ( 26 ) Primary light ( 24 ) in a wavelength range of ultraviolet rays or blue light. Lighting device ( 10 ) according to one of the preceding claims, characterized in that the at least one semiconductor light source ( 26 ) blue primary light ( 24 ) and that the wavelength converter ( 28 ) Luminescent dyes for generating green and red secondary light ( 32 ) having. Lighting device ( 10 ) according to one of claims 1 to 12, characterized in that the at least one semiconductor light source ( 26 ) ultraviolet primary light ( 24 ) and that the wavelength converter ( 28 ) Luminescent dyes for generating green, red and blue secondary light ( 32 ) having. Lighting device ( 10 ) according to one of the preceding claims, characterized in that the illumination device ( 10 ) is designed to realize at least one luminaire function.

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