EP2682671A2 - Light module - Google Patents

Abstract

The module (10) has a secondary optics device (30) projecting source light segments in a light beam distribution unit such that the distribution unit includes light beam segments that are attached to the source light segments. Two primary optics devices (18, 22) are designed as optical imaging devices such that LEDs are reproduced as a real intermediate image on an intermediate image surface. The secondary optics device is arranged such that the intermediate images of source light segment-emitting LEDs are projected as the assigned light beam segments of the distribution unit.

Description

The invention relates to a light module for a lighting device according to the preamble of claim 1, in particular for a motor vehicle. Such light modules are used in motor vehicle headlamps as a high beam module use.

In this case, a light beam distribution with high homogeneity is regularly desired. In principle, strip-shaped regions of the emission light distribution with differing light intensity should be avoided, since these can be perceived as disturbing. On the other hand, the high beam in car headlamps should be realized glare-free if possible.

This is in the EP 2 280 215 A2 a motor vehicle headlamp described which has a plurality of LED light source modules for emitting light in substantially parallel emission directions. Each LED light source module includes one or more LEDs that can emit source light segments. Each LED light source module also includes a primary optics element for focusing the light emitted by the LEDs. Furthermore, each LED light source module has a secondary optics, by means of which the light segments generated by the primary optics elements can be imaged in a region located in front of the vehicle. In this case, the at least two LED light source modules are arranged in such a way to each other in a motor vehicle headlight that the source light segments from the individual LED light source modules are projected offset in the horizontal direction to each other. Therefore, several light modules are combined in one headlight. In the in the EP 2 280 215 A2 described motor vehicle headlights, the LED light sources of the individual LED light source modules can be controlled independently. To prevent dazzling of an oncoming vehicle then individual light sources can be hidden.

An alternative approach is in the JP 2010132170 described. This shows motor vehicle headlights, which each produce Abstrahllichtverteilungen with multiple, adjacent strip-shaped Abstrahllichtsegmenten. The light sources of a headlamp are controlled such that individual strip-shaped Abstrahllichtsegmente can be hidden in order to prevent the glare of oncoming traffic targeted. In order to produce the desired homogeneous emission light distribution, is in the JP 2010132170 proposed to arrange two such headlights spaced from each other on a motor vehicle, so that superimpose the individual Abstrahllichtsegmente to the Abstrahllichtverteilung.

The known solutions have the problem that in order to provide a homogeneous emission light distribution and to enable a glare-free high beam multiple headlights, or at least several light modules are combined with each other and must be coordinated. This requires a complex tuning and adjustment of the individual components, which can lead to high production costs. In addition, it is problematic to integrate in such complex arrangements other lighting functions such as side illumination, daytime running lights, flashing lights or a dipped beam or a dimmed light distribution.

The invention is therefore an object of the invention to provide a high beam with homogeneous Abstrahllichtverteilung one hand and anti-glare function for oncoming traffic on the other hand in a simple and cost-effective manner. In addition, more light functions such as a dimmed light distribution should be able to be integrated in a simple and cost-effective manner.

This object is achieved by a light module according to claim 1.

According to the invention, it is provided that the first and the second primary optics devices are designed in such a way that each LED (light-emitting diode) can be imaged in an associated real intermediate image in an intermediate image area, and in each case an intermediate image assigned to the first semiconductor light source is associated with at least one of the second semiconductor light source Intermediate image in the intermediate image area overlaps. Furthermore, the secondary optics device is as common secondary optics for the first and the second primary optics formed and arranged such that the first and the second semiconductor light source associated intermediate images of LEDs emitting a source light segment can be projected as each associated Abstrahllichtsegmente the Abstrahllichtverteilung.

In the light module according to the invention, therefore, two or more semiconductor light sources are combined, each with an associated primary optics device. Thus, a large radiated light intensity can be generated. It is advantageous in this case that only one secondary optics device is required, which jointly serves for the projection of intermediate images assigned to the first, the second and any further semiconductor light sources. As a result, space and material costs can be saved in the light module according to the invention.

The secondary optics need not be capable of producing an optical image. Rather, it is sufficient if the intermediate images for generating a Abstrahllichtverteilung can be projected in a main emission (for example, in the case of a car headlamp in the vehicle apron or as a collimated light beam to produce a high beam). However, the secondary optics device may also be designed as a projection lens or comprise such.

In the light module according to the invention, the overlapping emission light segments of the emission light distribution are respectively assigned to intermediate images of LEDs (which emit an associated source light segment) due. These intermediate images are generated by the primary optics device. If an adjustment of the alignment of semiconductor light sources and / or primary optics devices is required to produce a desired, in particular homogeneous, emission light distribution, this can be done easily within the light module in the light module according to the invention. Unlike the known solutions for generating said Abstrahllichtverteilungen it is therefore not necessary to align different light modules or even different headlights matched. Thus, in the production of the light module module-specific, a constructive solution for adjusting the semiconductor light sources and / or the primary optics can be provided. The light module is independent of the design of a headlight housing in which, for example, several light modules can be installed. Thus, the light modules according to the invention can be used in a variety of different headlights and for a variety of different housing shapes. This simplifies the design effort for such headlights. The light module according to the invention therefore allows flexible design solutions.

Since the secondary optics device projects a plurality of overlapping intermediate images as emission light distribution, a homogeneous emission light distribution can be generated with the light module according to the invention. As used herein, homogeneous does not necessarily mean that the illuminated area is the same everywhere. Rather, the Abstrahllichtverteilung may have areas of different brightness, provided that transitions between these areas are so steady that disturbing light effects are avoided. Apart from The targeted suppression of individual Abstrahllichtsegmente to realize a glare-free high beam sharp transitions or remote strip-shaped areas of different brightness are to be avoided. Also, the emission light distribution (viewed in an observation plane) should not be "spotty".

The primary optics are implemented as imaging optical devices which can generate real intermediate images of the source light segments in the intermediate image area. Depending on the design of the primary optics device, the intermediate image surface does not have to be designed as a flat surface. Simple imaging principles, however, arise when the primary optics device is designed such that an intermediate image plane is defined in the sense of the beam optics.

In the present context, a light segment (source light segment, emission light segment) is understood in each case to be a subarea of a light distribution (source light distribution, intermediate light distribution, emission light distribution), which is attributable to a specific LED.

With the light module according to the invention, a glare-free, dynamic high beam can be realized in a simple and cost-effective manner. For this purpose, the first and the second semiconductor light source are designed such that individual LEDs of the first and the second semiconductor light source are each independently controllable for emitting light. In particular, it may be sufficient if the said semiconductor light sources or the mentioned LEDs are designed to be switched on and off independently of each other.

This makes it possible to selectively hide individual radiated source light segments. An LED, which emits a source light segment, is assigned an intermediate light segment in the intermediate image area. By hiding a source light segment, the associated intermediate light segment in the intermediate image area is also hidden, i. the respective intermediate image becomes dark. This leads to the respectively associated Abstrahllichtsegmente be hidden in the Abstrahllichtverteilung targeted. If, for example, a high-beam distribution of a motor vehicle headlight with a light module according to the invention is considered, then by switching off one or more LEDs, precisely those beam segments which could lead to dazzling oncoming traffic can be hidden. For this purpose, it is particularly advantageous to use an inventive light module in which the Abstrahllichtsegmente adjacent to each other in the horizontal direction or are arranged overlapping. With the light module according to the invention, therefore, a dynamic high beam or an adaptive curve light can be realized in a simple manner.

According to a particularly preferred embodiment, the LEDs of the first and the second semiconductor light source are arranged in a linear array. In particular, the linear array has regularly spaced arrangement positions for LEDs. In this respect, LEDs are arranged in a row, wherein the LEDs are designed in particular as directly adjacent components. Preferably, all LEDs of the first and second semiconductor light source are identical.

However, it may also be to obtain a light distribution with a greater vertical extent be advantageous if the LEDs of the first and second semiconductor light source are each arranged regularly in a planar array. Such a two-dimensional array provides matrix-like arrangement positions for regularly spaced LEDs. An example is a multi-line array. The individual LEDs are in turn designed in particular as directly adjoining components.

An advantageous embodiment results from the fact that the first and the second semiconductor light source each have a plate-like carrier element, on which the plurality of LEDs of the respective semiconductor light source are arranged. The carrier element is in particular a circuit board, on which a plurality of identical LED chips are arranged as SMD components ("surface mounted device"). In such components, the individual LED chips are usually arranged in the manner of a linear or planar array as described above. Such a structure allows comparatively inexpensive semiconductor light sources with a large number of individual LEDs, which makes it possible to achieve large emission intensities. Thus, bright and inexpensive light modules can be achieved. Preferably, the individual LEDs of the semiconductor light sources each have an edge-limiting light emission surface, wherein the LEDs in each semiconductor light source are arranged such that the edges of the LEDs extend in pairs in parallel. In particular, the LEDs have substantially square light emission surfaces. In this way, an array of the type described above can be realized simply by arranging the individual LEDs next to one another like a tile.

For a further embodiment of the light module according to the invention, it is provided that the first and the second primary optics device are respectively designed such that the intermediate images assigned to the first semiconductor light source are shifted in a horizontal direction relative to the intermediate images assigned to the second semiconductor light source. When using the light module in a motor vehicle headlamp, the horizontal direction denotes a direction parallel to the road plane. Due to the above-mentioned arrangement, vertically extending dark stripes are avoided in the emission light distribution, since the overlapping intermediate images in the intermediate image area result in an almost homogeneously illuminated region. This area is projected by the secondary optics device into a homogeneous emission light distribution.

For a further embodiment, it may also be advantageous if the first and the second primary optics device are designed such that the intermediate images assigned to the first semiconductor light source are also displaced in a vertical direction perpendicular to the horizontal direction relative to the intermediate images assigned to the second semiconductor light source. As a result, it is possible, for example, to realize an emission light distribution with increased vertical extent. If the intermediate images overlap in the vertical direction, they are projected by the secondary optics device into an emission light distribution with also vertically overlapping emission light segments. In particular, when the semiconductor light sources use a planar array of those described above, it is possible to realize an emission light distribution having an increased vertical extent and a homogeneous intensity distribution. This can be done in the emission light distribution disturbing horizontal stripes are avoided.

For a further embodiment, the first and the second primary optics device may be designed such that each LED is imaged in an intermediate image which is so blurred in the intermediate image surface that for a LED emitting a source light segment a continuous transition from light to dark along at least one direction is achieved in the intermediate image area. In this respect, the primary optics devices are designed in such a way that intermediate images which are blurred in at least one direction arise, that is to say that the light-dark lines which delimit an image of a source light segment in the intermediate image area are blurred. Preferably, said blurred or continuous transition is realized in the vertical direction, so that interfering horizontally extending sharp light transitions are avoided in the emission light distribution. The aforementioned blurred transitions can be achieved, for example, by virtue of the fact that the first and the second primary optics device have a cylindrical lens or a lens with different focal lengths with respect to mutually perpendicular directions. Also conceivable, however, are lenses with free-form surfaces which can purposefully bring about a desired distortion or blurring of the intermediate images.

According to a preferred embodiment, the intermediate images allocated to a respective semiconductor light source directly adjoin one another in the intermediate image area, the intermediate images assigned to the first semiconductor light source each overlapping one half of its width with an intermediate image assigned to the second semiconductor light source. In this respect overlap the intermediate images of the first semiconductor light source and the second semiconductor light source by a half LED image width. In the embodiments mentioned, the intermediate images complement each other to form an almost uniformly illuminated area in the intermediate image area. This uniformly illuminated area is projected by the secondary optics device into an almost uniformly illuminated emission light distribution.

In particular, each of the semiconductor light sources has a plurality of identically formed LEDs, which are arranged in an array such that adjacent LEDs adjoin one another. The LEDs are in particular formed with square light emitting surfaces. The first and second primary optics are then designed such that the intermediate images imaged in the intermediate image surface (in particular also square) overlap in each case over half of their width.

Preferably, the primary optics device is realized by a converging lens or comprises at least one converging lens. As a result, the desired mapping of the source light segments into real intermediate images (intermediate light segments) can be achieved in a simple manner. Also conceivable is the use of spherical lenses, which allow a simple construction with high optical quality and are relatively inexpensive to produce.

For further embodiment, it is provided that the first and / or the second primary optics device comprise an optical element for the correction of aberrations. This optical element is in particular in addition to an imaging optical element, such as a condenser lens, provided. Then, the imaging optical element is used to produce the real intermediate image of the source light segments, whereas with the aforementioned optical element in conjunction with the imaging element aberrations can be corrected. In this way, in the light module according to the invention, for example, unwanted color edges of the emission light distribution can be avoided in that the chromatic aberrations are already corrected in the intermediate image area. As an optical element for the correction of chromatic aberrations is an achromat for the correction of color aberrations into consideration.

In particular, when the primary optics device comprises a plurality of lenses, it is advantageous to provide the surfaces of the optical elements or the lenses with antireflection coatings.

A preferred embodiment of the light module results from the fact that the secondary optics device is designed as a secondary collecting lens, which defines a focal point, wherein the secondary collecting lens is arranged such that the focal point lies on the intermediate image surface. As a result, the overlapping, real intermediate images (and the associated intermediate light segments) can each be imaged into substantially parallel emission light bundles, which respectively define associated emission light segments. However, the secondary optics need not have imaging optical properties. The decisive factor is the suitability for the projection of the intermediate images in a main emission direction. It is therefore also conceivable that the secondary optics device comprises a cylindrical lens (for example with a focal line extending in the intermediate image area) or a Fresnel lens or is designed as such. A free-form lens is also conceivable which has desired projection properties.

The light module can advantageously be supplemented by additionally providing at least one side light source, with which light can be irradiated onto the intermediate image surface in such a way that a side light distribution, in particular in the main emission direction, can be projected with the secondary optics device. The sidelight distribution is in particular adjacent to the Abstrahllichtsegmente or surrounds the Abstrahllichtsegmente sections or completely. The Ablichtlichtsegmente can provide the central illumination in a high beam distribution, whereas the sidelight distribution provides a uniform light background and / or illuminates side areas. Thus, a larger area outside the central Abstrahllichtsegmente be illuminated. In the light module according to the invention, therefore, a sidelight can be combined in a simple manner with a high beam in one and the same module.

In this case, it is not necessary that light segments in the manner of a real intermediate image in the intermediate image area are also generated by the side light source. For the side light source, therefore, basically no primary optics device with imaging optical properties is required.

However, it may be advantageous if a side optics device associated with the side light source is provided. With the side optics device, light from the side light source can be focused or collimated onto the intermediate image surface. This will be the Efficiency of side illumination improved. As a side-lens device, for example, a TIR lens ("Total Internal Reflection Lens") are used. This has at least one light entry surface and at least one light exit surface and a total reflection surface such that light can be passed largely lossless from the light entrance surface to the light exit surface. As a side optics device can serve, for example, a front optics, as shown in the DE 486 303 is known. It has a central lens element arranged on an optical axis and a catadioptric ring element surrounding the lens element, the outer surface of which can totally reflect the light of a light source. With such attachment optics, light of a light source whose light is radiated into a half space in the direction of the optical axis can be efficiently collected and condensed.

As a side optics but can also serve as a reflector for focusing the light of the side light source. In this case, the reflector can in particular be designed parabolic or as a free-form reflector. Also conceivable are free-form lenses which concentrate the light of the side light source. Although the side optical device, as explained, does not have to have any imaging optical properties, imaging optical devices, such as the primary optics described above, can of course also be used.

The side light source may be formed like one of the semiconductor light sources described above. Advantageously, the side light source has a plurality of grouped LEDs, for example an LED array of the type described above. Regarding further Embodiments are therefore made to the comments on the semiconductor light sources.

A particularly preferred embodiment results from the fact that the side light source can be driven independently of the first and / or the second semiconductor light source for light emission, in particular independently switched on and off.

The light module is advantageously configured further by providing a diaphragm with an aperture edge which can be arranged between the first and second primary optics device on the one hand and the secondary optics device on the other hand so that a light beam distribution with a section-wise horizontal light-dark boundary can be achieved , The diaphragm with the diaphragm edge can be arranged in particular in or in the region of the intermediate image surface.

As a result, a dimmed light distribution can be generated with the light module according to the invention, which corresponds to the legal specifications for motor vehicle lighting devices. In particular, an asymmetric cut-off line can be achieved with two offset horizontal areas, which are connected via a rising area.

In this respect, the secondary optics device projects the diaphragm edge onto the roadway as a light-dark boundary of the resulting emission light distribution. The diaphragm edge is preferably located at the focal point or in the region of a focal point of a secondary optics device designed as a projection lens. The diaphragm itself may extend in a horizontal plane, wherein the horizontal plane preferably an optical axis of the

Projection lens or the secondary optics includes. In the intermediate image area, the aperture acts in such a way that certain areas of the intermediate images are shaded and thus the intermediate images are projected only in sections via the secondary optics device.

For further embodiment, a diaphragm actuator for moving the diaphragm is provided such that the diaphragm edge is movable into the intermediate image surface and out of the intermediate image surface. The diaphragm edge can be moved in the vertical or horizontal direction from the intermediate image area and into the intermediate image area. For example, the diaphragm actuator is designed such that the diaphragm with the diaphragm edge can be tilted about an axis of rotation. For this purpose, for example, the diaphragm is plate-like and arranged on a rotational axis of the diaphragm actuator.

A further advantageous embodiment of the light module also results from the fact that an adjusting device is provided, with which the relative position of the intermediate images of the first semiconductor light source to the intermediate images of the second semiconductor light source can be selectively changed. For this purpose, the adjusting device is designed, for example, such that the first semiconductor light source is displaceable in a controlled manner relative to the second semiconductor light source and / or relative to the first primary optics device and / or relative to the second primary optics device. It is also conceivable that the adjusting device is designed for the controlled displacement of the first primary optics device relative to the second primary optics device.

An adjusting device makes it possible to influence the emission light distribution of the light module in a comfortable manner by adjustment within the light module. The light module designed in this way can therefore be combined as a structural unit with other light modules without requiring a possibility for adjusting the light modules relative to each other. The light modules can be integrated as a finished assembly in more complex lighting devices. In this case, a problematic fine adjustment can be omitted during assembly. A vote of the Abstrahllichtverteilung can then be done by adjustment within the individual light modules. Since the light module represents a small and lightweight assembly within such a complex illumination device, the mechanical structures necessary for the adjustment can also be realized with lower weight and less costly than corresponding alignment devices for the entire illumination device. In addition, the adjusting device within the light module is independent of the design of a headlight housing. Thus, the light modules can be installed in different types of headlights with different housing shapes, with a specific adjustment of the adjusting device to the respective headlight type or to the respective housing is not required. This significantly reduces the design effort for more complex headlamps.

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

Figur 1

ein erfindungsgemäßes Lichtmodul in perspektivischer Ansicht;

Figur 2

das Lichtmodul aus Figur 1 in einer Draufsicht;

Figur 3

eine Halbleiterlichtquelle zur Verwendung in einem erfindungsgemäßen Lichtmodul;

Fig. 4 bis 6

schematische Darstellung zur Erläuterung der Abstrahllichtverteilung des Lichtmoduls gemäß Figur 1 und 2;

Figur 7

eine Halbleiterlichtquelle zur Verwendung in einem erfindungsgemäßen Lichtmodul;

Figur 8

schematische Darstellung zur Erläuterung der Abstrahllichtverteilung eines erfindungsgemäßen Lichtmoduls;

Figur 9

eine weitere Ausführungsform eines erfindungsgemäßen Lichtmoduls in perspektivischer Darstellung; und

Fig. 10 und 11

schematische Darstellung zur Erläuterung einer Seitenlichtverteilung;

Figur 12

schematische Darstellung zur Erläuterung der Abstrahllichtverteilung für ein Lichtmodul gemäß Figur 9;

Figur 13

schematische Darstellung zur Realisierung einer dynamischen Lichtverteilung mit einem Lichtmodul gemäß Figur 9;

Figur 14

eine weitere Ausführungsform eines erfindungsgemäßen Lichtmoduls;

Figur 15

schematische Darstellung der Abstrahllichtverteilung eines Lichtmoduls gemäß Figur 14;

Figur 16

eine weitere Ausführungsform eines erfindungsgemäßen Lichtmoduls in einer Seitenansicht;

Figur 17

eine Seitenansicht einer weiteren Ausführungsform eines erfindungsgemäßen Lichtmoduls.

Show it:

FIG. 1

an inventive light module in perspective view;

FIG. 2

the light module off FIG. 1 in a plan view;

FIG. 3

a semiconductor light source for use in a light module according to the invention;

4 to 6

schematic representation for explaining the emission light distribution of the light module according to FIGS. 1 and 2 ;

FIG. 7

a semiconductor light source for use in a light module according to the invention;

FIG. 8

schematic representation for explaining the Abstrahllichtverteilung a light module according to the invention;

FIG. 9

a further embodiment of a light module according to the invention in a perspective view; and

10 and 11

schematic representation for explaining a side light distribution;

FIG. 12

schematic representation for explaining the Abstrahllichtverteilung for a light module according to FIG. 9 ;

FIG. 13

schematic representation of the realization of a dynamic light distribution with a light module according to FIG. 9 ;

FIG. 14

a further embodiment of a light module according to the invention;

FIG. 15

schematic representation of the emission light distribution of a light module according to FIG. 14 ;

FIG. 16

a further embodiment of a light module according to the invention in a side view;

FIG. 17

a side view of another embodiment of a light module according to the invention.

In the following description, identical or corresponding components are given the same reference numerals.

The FIG. 1 shows an inventive light module 10, as can be used for example in a motor vehicle headlight for the realization of a high beam. For the light module 10, an optical axis 12 is defined which predefines a main emission direction 13. For better clarity, the light module 10 is shown without a housing, it being understood that a housing of any shape can be provided.

The light module 10 has a first semiconductor light source 14 and a second semiconductor light source 16, on the exact configuration below to the Figures 3 and 7 will be discussed in more detail. In any case, each of the semiconductor light sources has a plurality of grouped light-emitting diodes (LED), each LED of each semiconductor light source 14 or 16 being such is formed so that one of the respective LED associated source light segment can be emitted.

The first semiconductor light source 14 is associated with a first primary optics device 18 such that source light segments emitted by the first semiconductor light source 14 can be optically influenced. The first primary optics device 18 comprises a first imaging lens 19 and a second imaging lens 20, which are designed, for example, as converging lenses. In this case, the first primary optics device 18 defines a first optical primary axis 21.

The second semiconductor light source 16 is associated with a second primary optics device 22, which has a structure corresponding to the first primary optics device 18 with two imaging lenses, such as for example from the top view FIG. 2 is apparent. The second primary optics device 22 in turn defines a second optical primary axis 23.

The further embodiment of the first primary optic device 18 and the second primary optic device 22 will be described below with reference to the first primary optic device 18. This is designed such that an LED of the first semiconductor light source 14 is imaged via the lens 19 and 20 along the first optical primary axis 21 into a real intermediate image 26. Accordingly, the second primary optics device 22 images an LED of the second semiconductor light source 16 along the optical axis 23 into a real intermediate image 28.

The real intermediate images 26 and 28 lie on a common intermediate image area. If this intermediate image area were configured as a test screen, then observed on this test screen the real intermediate images 26 and 28 intermediate light segments 27, 29 are observed. In this case, the intermediate light segment 27 is assigned to the source light segment emitted by said LED of the first semiconductor light source 14. Accordingly, the intermediate light segment 29 is associated with a source light segment of an LED of the second semiconductor light source 16.

The light module 10 also has a secondary optics device 30, by means of which the intermediate images 26 and 28 can be projected into a light emission distribution along the main emission direction 13.

In the present case, the secondary optics device 30 is designed as a projection lens, more precisely as a secondary collection lens 32. The secondary collection lens 32 has an optical axis coincident with the main emission direction 13. Furthermore, the secondary collecting lens 32 defines a focal point 34. A light beam emanating from the focal point 34 is imaged by the secondary collecting lens in a light bundle parallel to the main emission direction 13. The secondary collecting lens 32 is designed and arranged such that the focal point 34 lies almost on the intermediate image area, in which the real intermediate images 26 and 28 are located. Therefore, the secondary collecting lens 32 images the intermediate images 26 and 28 in almost parallel to the main emission 13 extending Abstrahllichtbündel. These are assigned Abstrahllichtsegmente, as below to the FIGS. 4 to 6 explained in more detail.

In the FIG. 3 an exemplary embodiment for the first and second semiconductor light source 14 and 16 is shown. The semiconductor light source 14 and 16 has a board-like support member 40 on which a plurality of LEDs 42a to 42e are arranged in the manner of a linear array. All LEDs 42a to 42e are identical. As can be seen, by way of example, from the LED 42e, each LED has a nearly square light emission surface 44, which is delimited by edges 46. The square LEDs 42a to 42e are arranged on the carrier element 40 in such a line-like array, the edges 46 of adjacent Lichtabstrahlflächen 44 immediately adjacent to each other. The edges 46 of different LEDs 42a to 42e, which are oriented perpendicularly to these adjacent edges, lie on a common, straight line. With the semiconductor light sources 14 and 16 configured in this way, it is therefore possible to emit the source light segments assigned to the respective LEDs 42a to 42e and directly adjoining one another.

Each of the LEDs 42a to 42e can be supplied with operating current via associated contact pairs 47a to 47e. Therefore, each of the LEDs 42a to 42e is electrically energized independently of other LEDs, that is, independently of other LEDs on and off. Thus, individual source light segments can be selectively hidden. As a result, as explained below, a glare-free high beam can be realized.

In the in the Figures 1 and 2 1, the entirety of first semiconductor light source 14 and first primary optic 18 is arranged relative to the unit of second semiconductor light source 16 and second primary optics device 22 such that an intermediate image attributed to first semiconductor light source 14 overlaps at least one further intermediate image attributable to second semiconductor light source 16 , This will be described below on the basis of FIGS. 4 to 6 explained in more detail.

This is in the FIGS. 4 to 6 in each case the emission light distribution of the light module 10 is shown in different operating states, as can be observed in a test screen spaced from the light module 10 along the main emission direction 13, which extends perpendicular to the main emission direction 13. It is assumed that the semiconductor light sources 14, 16 of the light module 10 as in FIG. 3 are designed.

The FIG. 4 shows first the Abstrahllichtverteilung, which results in the light module 10, when only the LEDs of the first semiconductor light source 14 are turned on. The emission light distribution 48 has a plurality of emission light segments 50a to 50e, which correspond to the individual LEDs 42a-42e. This is due to the fact that the secondary collecting lens 32 projects the intermediate images formed in the region of their focal point 34 in the intermediate image area as a parallel light bundle. Since the first semiconductor light source 14 in the zu FIG. 3 explained, the real intermediate images of the LEDs 42a to 42e (ie their associated Lichtabstrahlflächen 44) have a substantially square shape. These intermediate images, which are essentially square-edged, are then imaged via the secondary optics device into the likewise substantially square-limited emission light segments 50a to 50e.

One of the FIG. 4 A qualitatively corresponding image would result if a test screen were placed in the intermediate image area. On this test screen could then the Abstrahllichtsegmenten 50a to 50e associated Intermediate light segments are observed, which would also be substantially square-shaped.

To determine the spatial position and orientation of the Abstrahllichtsegmente are in the FIG. 4 (also in FIGS. 5 and 6 ) introduced vertical and horizontal angle coordinates. These correspond to coordinates in the coordinate plane spanned by the Y-axis (vertical) and X-axis (horizontal), compare the in the Figures 1 and 2 indicated coordinate systems. X and Y coordinates can be represented by angle data relative to the main emission direction 13.

The FIG. 5 shows in one of the FIG. 4 corresponding representation of the emission light distribution 48 of the light module 10, when in contrast to FIG. 4 only the second semiconductor light source 16 is in operation. The emission light distribution 48 again has substantially square-shaped emission light segments 51a to 51e, which are each due to source light segments of the associated LEDs 42a to 42e, as described above.

In the Figures 1 and 2 It can be seen that the first optical primary axis 21 and the second optical primary axis 23 enclose an angle to one another and intersect near the intermediate image area or in the vicinity of the focal point 34. The imaging properties of the first primary optics device 18 and of the second primary optics device 22 and their mutual alignment with one another are selected such that the emission light segments 51a to 51e attributable to the second semiconductor light source 16 move along the emission light segments 50a to 50e due to the first semiconductor light source 14 Horizontal direction (which of the X-axis in the coordinate systems according to FIGS. 1 and 2 corresponds) are shifted. How out FIG. 5 As can be seen, the Abstrahllichtsegmente 51 a to 51 e extend on the observed test screen in an angular range of about -7.5 ° to + 15 ° in the horizontal, whereas the Abstrahllichtsegmente 50 a to 50 e in the horizontal an angular range between about -17.5 ° and + 7.5 ° fill.

The FIG. 6 Finally, the emission light distribution 48 of the light module 10 shows when both the first semiconductor light source 14 and the second semiconductor light source 16 are in operation with all the LEDs. As can be seen, the emission light segments 51a to 51e partially overlap with the emission light segments 50a to 50e. In this case, the emission light segments 51a to 51e attributed to the second semiconductor light source 16 are displaced along the horizontal direction in relation to the emission light segments 50a to 50e due to the first semiconductor light source 14, for example the emission light segment 51a dividing the two adjoining emission light segments 50b and 50c over half of their width overlaps along the horizontal. In this respect, the Abstrahllichtsegmente the first and second semiconductor light source 14 and 16 are offset by a "half pixel width" horizontally.

One of the FIG. 6 A qualitatively corresponding image would again result in the intermediate image area, where an intermediate image of an LED of the second semiconductor light source 16 overlaps an intermediate image of an LED of the first semiconductor light source 14 over half its width.

When both semiconductor light sources 14 and 16 are in operation, a substantially homogenous beam light distribution 48 can be generated in their center region (ie in the range from -12.5 ° to 10 ° in the horizontal).

Moreover, each of the emission light segments 50a to 50e in the emission light distribution 48 can be selectively masked out. For this purpose, the associated LED 42a - 42e of the first semiconductor light source 14 is turned off. Accordingly, individual of the Abstrahllichtsegmente 51a to 51e can be hidden by targeted shutdown of LEDs of the second semiconductor light source 16. This makes it possible to realize a dazzle-free high beam distribution by deliberately switching off such LEDs of the first or second semiconductor light source whose respective source light segment is assigned to a light beam segment 50a to 50e or 51a to 51e, which could result in dazzling of an oncoming or preceding vehicle.

In the FIG. 7 a further advantageous embodiment for the semiconductor light source 14 and 16 is shown, which can be used for example in the light module 10 and in the other light modules described below. Unlike the in FIG. 3 illustrated semiconductor light source are arranged on the support member 40, a larger number of LEDs 54a to 54e and 55a to 55e in the manner of a regular, areal array. This array is formed by combining a first line-like arrangement of the LEDs 54a to 54e with a further line-like arrangement of the LEDs 55a to 55e running parallel thereto, such that an LED within a line directly adjoins at least one adjacent LED and one LED each of a row with one of its edges immediately adjacent to an LED of the other line. The individual LEDs 54a to 54e and 55a to 55e of each row of the planar array are electrically controllable independently of each other via contact pairs 56a to 56e (for the first row 54a to 54e) and 57a to 57e (for the second row 55a to 55e) switched on and off.

For certain applications, it may be advantageous if emission light segments of the emission light distribution 48 are intentionally smeared in the vertical direction (Y direction) or delimited in the vertical direction by blurred edges which define a continuous transition from light to dark in the vertical direction. As a result, interfering horizontal edges, which are undesirable when using the light module in a motor vehicle headlight, can be avoided in the emission light distribution 48, for example.

To clarify the shows FIG. 8 a Abstrahllichtverteilung 48 in a FIGS. 4 to 6 corresponding representation. The emission light distribution 48 in turn has emission light segments 60a to 60e, wherein the emission light segments 60a to 60e in the vertical direction (ie, vertical angle component) are blurred, that is to say a continuous light-dark transition takes place in the vertical direction. Such emission light distribution can be achieved by forming the first and second primary optics 20 and 22 such that each intermediate image in the intermediate image surface is formed along the vertical direction (Y direction in FIG FIGS. 1 and 2 ) is blurred limited, that takes place in the intermediate image area, a continuous transition from light to dark along the vertical direction. In this respect, the intermediate images bounding edges are blurred.

The FIG. 9 shows a perspective view of a light module 70, with which advantageously an additional side illumination can be achieved.

The light module 70 differs from the light module 10 essentially in that in addition to the semiconductor light sources 14 and 16, a first side light source 72 and a second side light source 74 are provided. The side light sources 72 and 74 are also used as semiconductor light sources FIG. 3 or FIG. 7 formed type described. However, the side light sources 72 and 74 may be configured differently than the first and second semiconductor light sources 14 and 16. For example, it is conceivable that the side light sources 72 and 74 each have only one LED for light emission. This may be sufficient since usually only a lower light intensity is needed for the side illumination than in the center, where a maximum range is to be achieved (for example for a high beam function).

The side light sources 72 and 74 are designed to radiate additional light into the area of the intermediate image area, ie into the area of the intersection of the first primary optical axis 21 and the second primary optical axis 23 (as in FIGS Figures 1 and 2 illustrated).

For this purpose, the first side light source 72 is assigned a first side optical device 76. This defines a first optical side axis 80 which intersects the intermediate image area. The first side optical device 76 functions such that light emitted from the side light source 72 is incident to the light source first optical side axis 80 collimated or - depending on the configuration - is bundled towards this axis.

In the illustrated example, the first side optical device 76 is designed as a front optical system of the first side light source 72, which has a TIR lens with a light entrance surface facing the side light source 72. In this case, the TIR lens is preferably designed such that almost all the light from the side light source 72 can be bundled into the half space in the direction of the main emission direction 13. In contrast to the primary optics devices 18 and 22, such a side optical device 76 designed as an optical attachment device does not permit optical imaging of the LED of the side light source 72 as a real intermediate image onto the intermediate image surface.

The light distribution arising in the intermediate image area can be influenced by targeted design of optically effective areas of the side optical device 76 (for example as free-form surfaces).

In a corresponding manner, the second side light source 74 is assigned a second side optical device 78, which defines a second optical side axis 82. With regard to the configuration of the second side optical device 78, reference is made to the above description of the side optical device 76.

The side optics 76 and 78 are formed such that the light irradiated into the intermediate image area by the side light sources 72 and 74 can be projected with the side optics 30 into a side light distribution 84 which is in the FIGS. 4 to 6 fully explains the emitted light distribution.

Said sidelight distribution 84 will be described below with reference to FIGS Figures 10 and 11 explained in more detail (in a the FIGS. 4 to 6 corresponding representation on a test screen).

The FIG. 10 FIG. 12 shows the light distribution produced by the light module 70 when only the first side light source 72 is powered to emit light. The remaining light sources (14, 16, 74) are switched off in this case. Obviously, the light irradiated from the first side light source 72 into the intermediate image surface is projected by the secondary optical device 30 into a portion of the side light distribution 84 which corresponds to an outside area with respect to the main emission direction 13 in the horizontal direction (X-axis and negative horizontal angles, respectively).

The FIG. 11 shows one of the FIG. 10 corresponding representation, when in the light module 70, only the second side light source 74 is in operation, and all other light sources (72, 14, 16) are turned off. In this case, a side area outside the main emission direction 13 is illuminated.

The side areas illuminated by the respective side light sources 72 and 74, respectively, have an asymmetrical shape. This is due to the fact that in the present case the side optical devices 76 and 78 are not designed as rotationally symmetrical optical systems. Rather, in the case of the light module 70, the side optics 76 and 78 are designed as asymmetrical attachment optics.

In the FIG. 12 For example, the light distribution radiated from the light module 70 is shown in the case that both of the two semiconductor light sources 14 and 16 and both side light sources 72 and 74 are in operation. The central area of the in FIG. 12 shown test screen (in the range of 0 ° horizontal and vertical deviation from the main emission direction 13) of the Abstrahllichtverteilung 48 illuminated, as in FIG. 6 shown. In this case, the overlapping Abstrahllichtsegmente 50a to 50e and 51a to 51e (see FIG. 6 ) a homogeneously illuminated area of high light intensity. The sidelight distribution 84, which by superimposing in the Figures 10 and 11 shown partial side light distribution results, surrounds the intense central Abstrahllichtverteilung 48th

The light module 70 makes it possible to intentionally hide a specific area of the intensive emission light distribution 48, and nevertheless to ensure lateral illumination at larger angles to the main emission direction 13. This may be desirable for generating a high beam distribution in which in certain situations, the central, intense Abstrahllichtverteilung 48 is to be hidden in such angular ranges, which could lead to dazzling oncoming traffic, while still a side illumination is to be ensured.

The FIG. 13 shows the light distribution emitted by the light module 70 when the side light sources 72 and 74 emit light, but individual LEDs of the first semiconductor light source 14 are hidden. The semiconductor light source 16 emits light with substantially all of its LEDs, but one the LEDs are hidden (eg 42e and possibly also 42d). It is also conceivable that all LEDs of the semiconductor light source 16 emit light. For example, in the FIG. 3 shown semiconductor light source used in the light module 70 such that the light emitting diodes 42a to 42e of the first primary optics 18 are facing, the results in the FIG. 13 represented light distribution in that, although the LEDs 42a, 42d, 42e are in operation, but the LEDs 42b and 42c are turned off. It can be seen that the emission light segments of the emission light distribution 48 assigned to the LEDs 42b and 42c are hidden (these correspond in the illustration of FIG FIG. 6 the emission light segments 50b and 50c). The remaining portion of the emission light distribution 48 (corresponding to the emission light segments 50a, 50d, 50e, and 51a to 51e) results in a emission light distribution 48 having a vertical dark region. As explained above, the side light distribution 84 adjoins the central emission light distribution 48 in the outer horizontal angle regions.

Another embodiment of the invention is in FIG. 14 shown. The light module 90 shown there differs from the light module 70 according to FIG. 9 in that an aperture 92 is provided. As a result, a radiated light distribution with a light-dark boundary can be generated (dimmed light distribution).

For this purpose, the plate-like aperture 92 is bounded by a diaphragm edge 94. The diaphragm edge 94 extends in sections in the intermediate image area. The diaphragm edge 94 has a first horizontally extending portion and a subsequent second horizontally extending portion, which opposite the first is offset in the manner of a vertical step. In this case, the first horizontally extending portion is connected via a sloping edge portion with the second horizontal portion.

Since the aperture 92 fades out a portion of the light distribution projected from the intermediate image area via the secondary optics device 30, the light distribution emitted by the light module 90 also has a corresponding faded-out area.

The FIG. 15 shows the light distribution emitted by the light module 90 when all the light sources (semiconductor light sources 14, 16 and side light sources 72 and 74) are in operation. Recognizable are opposite to the representation in FIG. 12 only those portions of the emission light distribution 48 and the side light distribution 84 are illuminated, which are not shaded by the aperture 92 in the intermediate image area. In this respect, the light distribution emitted by the light module 90 has a light-dark boundary, which corresponds in its course to the diaphragm edge 94. From the secondary collecting lens 32, the diaphragm edge 94 is imaged as an asymmetrical light-dark boundary. This has two horizontally extending, mutually vertically offset boundary lines, which are connected by a rising at an angle of 15 ° in particular boundary line. In this case, the vertically lower region of this asymmetrical cut-off line defines the oncoming traffic range of the emission light distribution, in which intentional dazzling of oncoming traffic can be avoided.

The aperture 92 is preferably arranged movably, as described in the FIG. 16 illustrated light module 100 is explained. The light module 100 is in one Side view is shown perpendicular to the main emission 13 and substantially corresponds to the light module 90. In contrast, however, the aperture 92 is formed in the beam path and folded out.

For this purpose, the diaphragm 92 is arranged on a rotation axis 102, which is perpendicular to the main emission direction 13 (in the present case in the X direction), of a diaphragm actuator 103 (for example a rotary motor), which is not shown in greater detail. The diaphragm 92 can be tilted by means of the diaphragm actuator 103 in such a way that the diaphragm edge 94, starting from the diaphragm in FIG FIG. 16 shown position from the intermediate image area can be tilted out. This can happen, for example, that in the FIG. 16 the shutter actuator 103, the rotation axis 102 is rotated clockwise and thereby the plate-like aperture 92 is tilted in the direction of the secondary optics 30.

Another realization of an activatable and deactivatable aperture is in the FIG. 17 for the light module 110. In contrast to the light module 100, the aperture 92 does not extend vertically but horizontally. The optical axis 12 of the light module 110 extends through the plate-like aperture 92. The aperture 92 is arranged such that the diaphragm edge 94 extends in the region of the intermediate image area.

In the light module 110, the first semiconductor light source 14 and the side light source 72 (likewise the second semiconductor light source 16 and second side light source 74, not shown) are arranged such that the optical axes associated with these light sources (first optical primary axis 21 and first optical axis 80) are opposite to the optical Axis 12 of the light module 110 (which the optical axis of the secondary optics 30th corresponds) to a non-vanishing angle in the vertical are tilted. Therefore, part or sections of the light distribution in the intermediate image area are masked out with the horizontally extending diaphragm 92.

It is conceivable that the illuminated by the light sources 14 and 72 surface of the plate-like aperture 92 is formed mirrored, so that the hidden light distribution is additionally directed in the illuminated area of the radiated light distribution.

In the light module 110, in turn, a diaphragm actuator not shown is provided with which the diaphragm 92 can be moved in the XZ plane along the optical axis 12 back and forth. It is also conceivable that the aperture 92 is tiltable about an axis of rotation 112 by a diaphragm actuator, as in the FIG. 17 indicated by arrows. As a result, the diaphragm edge 94 can each be moved into the intermediate image area and out of the intermediate image area.

All light modules can be further improved in that an adjusting device is provided, with which the position of the first semiconductor light source 14 with respect to the position of the second semiconductor light source 16 is controlled variable. However, it is also conceivable to provide an adjusting device with which the orientation or position of the primary optics 18 and 22 relative to each other and / or relative to the positions of the respective associated semiconductor light sources 14 and 16 is variable. In this way, the relative position of the intermediate images to one another and thus the relative position of the Abstrahllichtsegmente can be adjusted to each other.

Claims (15)

Light module (10, 70, 90, 100, 110) for a lighting device, with at least a first and a second semiconductor light source (14, 16),
each semiconductor light source (14, 16) comprising a plurality of grouped LEDs (42a-42e; 54a-54e; 55a-55e) for radiating a respective source light segment, with at least one first primary optics device (18) assigned to the first semiconductor light source (14) and a second primary optics device (22) assigned to the second semiconductor light source (16), and a secondary optics device (30) for projecting the source light segments into an emission light distribution (48) of the light module (10, 70, 90, 100, 110) in such a way, in that the emission light distribution (48) has emission light segments (50a-50c, 51a-51e) which overlap one another and are respectively assigned to the source light segments,
characterized in that
the first (18) and the second (22) primary optics device are designed in such a way that each LED (42a-42e; 54a-54e; 55a-55e) acts as a real intermediate image in one
Intermediate image area is mapped,
wherein an intermediate image associated with the first semiconductor light source (14) overlaps with at least one intermediate image associated with the second semiconductor light source (16),
and that the secondary optics device (30) is arranged such that the intermediate images of LEDs (42a-42e; 54a-54e; 55a-55e) emitting source light segments can be projected as respectively assigned emission light segments of the emission light distribution (48). The light module (10, 40, 90, 100, 110) of claim 1, characterized in that the individual LEDs (42a-42e; 54a-54c; 55a-55e) of the first and second semiconductor light sources (14, 16) are independently radiating be controlled by light and / or independently switched on and off. Light module according to claim 1 or 2, characterized in that the LEDs (42a-42e) of the first and second semiconductor light source (14, 16) are each arranged regularly in a linear array. Light module according to one of the preceding claims, characterized in that the LEDs (54a-54e; 55a-55e) of the first and second semiconductor light source are each arranged regularly in a planar array. Light module (10, 70, 90, 100, 110) according to any one of the preceding claims, characterized in that the first and the second primary optics (18, 22) are formed such that the intermediate images associated with the first semiconductor light source (14) relative to the second semiconductor light source (16) associated intermediate images in a horizontal direction (X) are shifted. Light module according to the preceding claim, characterized in that the first (18) and the second (22) primary optics device are designed in such a way that the intermediate images associated with the first semiconductor light source (14) also have an image relative to the intermediate images associated with the second semiconductor light source (16) Horizontal direction (X) vertical vertical direction (Y) are shifted. Light module according to one of the preceding claims, characterized in that the first and the second primary optics (14, 16) are formed such that each intermediate image is so blurred in the intermediate image area that a continuous transition from light to dark along at least one direction in the intermediate image area can be achieved. Light module (10, 70, 90, 100, 110) according to one of the preceding claims, characterized in that the first and the second primary optics (18, 22) and the first and second semiconductor light source (14, 16) are formed such that the an intermediate image corresponding to a respective semiconductor light source (14, 16) adjoins one another directly in the intermediate image area, and that an intermediate image assigned to the first semiconductor light source (14) overlaps at least one intermediate image associated with the second semiconductor light source (16) over half its width. Light module according to one of the preceding claims, characterized in that the first and / or the second primary optics (18, 22) comprises an optical element for correcting aberrations. Light module (10, 70, 90, 100, 110) according to one of the preceding claims, characterized in that the secondary optics device (30) is designed as a secondary collecting lens (32) which defines a focal point (34), wherein the secondary collecting lens (32) so is arranged so that the focal point (34) lies on the intermediate image area. Light module (70, 90, 100, 110) according to any one of the preceding claims, characterized in that at least one side light source (72, 74) is provided, with which light can be irradiated onto the intermediate image surface such that the secondary optics device (30) the Abstrahllichtsegmente (50a-50e; 51a-51e; 60a-60e) adjacent or this partially or completely surrounding side light distribution (84) is projected. Light module (70, 90, 100, 110) according to the preceding claim, characterized in that a lateral optics device (76, 78) associated with the side light source (72, 74) is provided, with which light from the side light source (72, 74) on the Intermediate image area can be bundled or collimated. Light module (90, 100, 110) according to any one of the preceding claims, characterized in that a diaphragm (92) is provided with a diaphragm edge (94) which between the first (18) and second (22) primary optics on the one hand and the secondary optics (30) on the other hand can be arranged that a Abstrahllichtverteilung (48) can be achieved with a sectionwise horizontally extending cut-off line. Light module (100, 110) according to the preceding claim,
characterized in that a diaphragm actuator (103) for moving the diaphragm (92) is provided such that the diaphragm edge (94) is movable into the intermediate image area and out of the intermediate image area. Light module according to one of the preceding claims, characterized in that an adjusting device is provided, with which the first semiconductor light source (14) relative to the second semiconductor light source (16) and / or relative to the first primary optics (18) is controlled displaced.

Images