EP2827049A2 - Headlight for a glare-free main beam - Google Patents

Abstract

Disclosed is a motor vehicle headlight (10) having a pair of adjacent adjacent light sources (16.1, 16.2, 16.3) having light source field (16), each of the light sources is arranged and with a collecting lens array (22), for each of the at least three light sources exactly one converging lens (22.1, 22.2, 22.3), which is associated with the respective light source in that a light entrance surface of this converging lens is located in the outgoing light beam from this light source. The headlamp is characterized in that it comprises at least one aperture (24) which is arranged on the light entrance surface side of two directly adjacent collecting lenses so that it shades the light entrance surface of the one of the two converging lenses against light, the other of the two is associated with each other directly adjacent arranged collecting lenses.

Description

The present invention relates to a headlamp according to the preamble of claim 1. Such a headlamp is provided by the inventor known per se and has at least two adjacently arranged light sources having light source field, each of the light sources is adapted to light in a To emit main light emission direction having light beam. In addition, the motor vehicle headlamp on a collective lens field, which has exactly one converging lens for each of the at least two light sources, which is associated with the respective light source in that a light entrance surface of this convergent lens is in the outgoing light beam from this light source, and the main emission of this light source intersects.

The per se known headlight serves to produce a so-called anti-glare high beam. among them is understood to be a high beam light distribution, in the subregions can be darkened targeted to avoid dazzling other road users. The darkening takes place automatically on the basis of signals from sensors that detect such road users in advance of the vehicle. Examples of such sensors are visible light cameras, infrared radiation sensors and radar sensors.

There are several ways to create a non-glare high beam. Recently, systems have been developed which divide a high beam light distribution into a plurality of adjacent strip light fields. The individual light fields have relatively sharp vertical boundaries. Thus, it is possible to darken individual fields in the high beam, in which oncoming or leading road users are detected.

Such a light distribution is usually generated in two stages. First, an intermediate image is generated with the aid of primary optics from the light of a plurality of light sources, the light fields of which preferably adjoin one another directly and do not overlap. The light sources are semiconductor light sources, in particular light-emitting diodes, whose luminous flux can be individually controlled by light-emitting diodes. In a second step, the high beam distribution is formed from this intermediate image by a secondary optics.

Most secondary optics is an imaging optic that focuses on the intermediate image. The secondary optics can be designed as a converging lens, as a parabolic mirror or as an optical system of a plurality of lenses and / or mirrors. The secondary optics can also be modified so that the Image of the intermediate image is a vertical and / or horizontal scattering superimposed to produce a rule-compliant light distribution.

The primary optics proposed for these systems are, in particular, optics fields comprising concave mirrors and light guides whose cross-section widens in the main propagation direction of the light. An example of such light guides is realized by conical light guides. But there are also systems that work without primary optics. Here, the secondary optics focuses directly on a field of directly adjacent light exit surfaces of light-emitting diode chips.

When using a collecting lens array, the intermediate image is preferably formed on a continuous light exit surface of the collecting lens array. In order to avoid disturbing dark stripes between the individual light fields, the collecting lens array is preferably realized as a cohesively one-piece, coherent combination of the individual collecting lens areas.

Such a combination is particularly easy to produce, because it reduces the number of components compared to a built-up of many individual convergent lenses primary optics. Analog also reduces the adjustment effort in the production of the headlamp. In addition, the combination is particularly robust and cost-effective. The relatively simple collection lens geometry can even be realized in glass.

When using such a combination in conjunction with light emitting diodes, the white light through with an aid To form a phosphor layer conversion of blue light, the following problem has arisen.

When taking place to darken individual fields of light off individual LEDs has not resulted in complete darkening of this field.

Since there are other road users in the darkened light fields of the glare-free high beam, only very low light intensities are permitted here, of course. As a rule, the intensity of the light in the darkened fields should be less than 1/100 of the light intensity in the adjacent illuminated light fields.

Against this background, the object of the present invention is to provide a headlamp of the aforementioned type, which allows a more complete darkening of individual fields even when using a cohesively coherent collecting lens field in conjunction with the use of light emitting diodes having a phosphor layer for Lichtfarbenkonvertierung.

This object is achieved with the features of claim 1. The invention differs from the initially mentioned and known per se known prior art in particular the fact that the headlamp has at least one aperture which is arranged on the light entrance surface side of two directly adjacent collecting lenses so that they the light entry surface of the one shadows two converging lenses against light emanating from the other of the two converging lenses associated light source.

The invention is based on the finding that stray light of a switched-on light-emitting diode can reach the phosphor layer of light-emitting diodes switched off via the collector lens field. There, this scattered light penetrates into the phosphor layer and stimulates it to shine. As a result, the off and thus de-energized light emitting diodes start to glow slightly, which prevents a desired complete darkening of the associated light fields.

By the aperture prevents stray light of a light-emitting diode undesirably penetrates into the converging lens of an adjacent, de-energized light emitting diode. This eliminates the cause of the unwanted lighting of currentless LEDs effectively and with little technical effort. The aperture forms together with the collecting lens field a structurally simple primary optics for a glare-free high beam module of the headlight. This simple primary optics is able to generate from the light of a plurality of light emitting diodes whose light exit surface are separated from one another by distances, an intermediate image with a plurality of light fields directly adjacent to one another corresponding to the number of light sources.

In this case, the invention is in particular capable of achieving a particularly high light-dark contrast between the fields of light-emitting diodes switched on and switched-off light-emitting diodes. These advantages are achieved by the fact that the diaphragm effectively prevents an optical coupling between different light sources via the collecting lens array.

A preferred embodiment is characterized in that the at least one aperture a pinhole in shape a plate, which is arranged between the light source field and the collecting lens array and which has a diaphragm web for each pair of mutually adjacent light sources of the light source field.

It is also preferred that the pinhole has a number of recesses which is identical to the number of light sources of the light source field, wherein the recesses in the pinhole are just arranged so that in the assembled state exactly one recess of the pinhole in front of a light exit surface exactly one Light source of the light source field is located and that lying between adjacent recesses aperture webs on the light entrance surface side of two directly adjacent collecting lenses are arranged so that it shadows the light entrance surface of the one of the two converging lenses against light of the light source, which arranged the other of the two directly adjacent each other Associated with collective lenses.

Furthermore, it is preferred that the diaphragm webs are arranged centrally between each two adjacent light sources.

It is also preferred that the collecting lens array is a one-piece cohesively coherent component, which is made of transparent material and shaped so that for each light exit surface of the light emitting diode of the light source field results in a converging lens, which is associated with the respective light source in that a light entry surface of this Lens lies in the outgoing light beam from this light source and cuts the Hauptlichtabstrahlrichtung this light source.

It is also preferred that a width of the diaphragm webs at least the width of the shielded Light exit surfaces of the LEDs corresponds.

It is also preferred that the diaphragm has at least one recess having a constriction, wherein the constriction is as wide as the width of the parallel to the diaphragm edge light exit surface of the light emitting diode, which is arranged in the recess.

It is also preferred that the constriction is located where the light-emitting diode is located, which is preferably arranged centrally in the recess.

It is also preferred that the diaphragm has at least one recess which is constricted on one side on a side facing an adjacent LED and is not constricted on the side opposite this side.

It is also preferred that the clear width of the constriction of the recess corresponds to the width of the light-emitting diodes in the direction of the row arrangement.

It is also preferred that the opaque aperture material is embedded in the transparent lens material.

It is also preferable that the diaphragm material is a metallic material.

It is also preferable that the diaphragm has a solderable surface.

It is also preferable that the diaphragm has a U-shape.

It is also preferable that the diaphragm to the bottom of the U-shape having opposite ends of the U-leg holding means, with which it is fastened to the circuit board 54.

Further advantages will be apparent from the dependent claims, the description and the attached figures.

It is understood that the features mentioned above and those yet to be explained can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Figur 1

ein Ausführungsbeispiel eines erfindungsgemäßen Kraftfahrzeugscheinwerfers;

Figur 2

ein optisches System eines konkreten Ausführungsbeispiels eines erfindungsgemäßen Scheinwerfers oder Lichtmoduls des Scheinwerfers;

Figur 3

ein weiteres Ausführungsbeispiel eines optischen Systems eines erfindungsgemäßen Scheinwerfers;

Figur 4

die Ersatzlichtquelle;

Figur 5

eine Ansicht einer Lichtaustrittsfläche eines Sammellinsenfeldes, das n = 6 Sammellinsen enthält;

Figur 6

einen Querschnitt durch den Gegenstand der Figur 5, der die Entstehung eines unerwünschten Effektes veranschaulicht;

Figur 7

den Gegenstand der Figur 5 mit erfindungsgemäß vorgesehenen Blenden, die eine unerwünschte Einkopplung von Streulicht einer Lichtquelle in die Sammellinse einer benachbarten Lichtquelle

Figur 8

verhindern; Blendenstege, die auf der Lichteintrittsflächenseite des Sammellichtfeldes liegen und dort insbesondere zwischen zwei einander direkt benachbart angeordneten Sammellinsen angeordnet sind;

Figur 9

eine Lichtaustrittsfläche eines Sammellinsenfeldes für eine Ausgestaltung, die sich durch eine bevorzugte Form der Ausnehmungen in der Lochblende auszeichnet;

Figur 10

die Wirkung der bevorzugten Ausgestaltung;

Figur 11

eine Ansicht der Lichtaustrittsseite eines m = 4 Zeilen und n = 10 Spalten von Sammellinsen aufweisenden Sammellinsenfeldes

Figur 12,

einen Querschnitt des Gegenstands der Figur 11; und

Figur 13

den Gegenstand der Figuren 11 und 12 in einer isometrischen Darstellung.

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show, in schematic form:

FIG. 1

an embodiment of a motor vehicle headlight according to the invention;

FIG. 2

an optical system of a specific embodiment of a headlamp or light module of the headlamp invention;

FIG. 3

a further embodiment of an optical system of a headlamp according to the invention;

FIG. 4

the replacement light source;

FIG. 5

a view of a light exit surface of a collecting lens array containing n = 6 converging lenses;

FIG. 6

a cross section through the subject of FIG. 5 that illustrates the emergence of an undesirable effect;

FIG. 7

the object of FIG. 5 with inventively provided aperture, the unwanted coupling of stray light of a light source in the converging lens of an adjacent light source

FIG. 8

prevent; Diaphragm webs which lie on the light entry surface side of the collective light field and are arranged there in particular between two mutually directly adjacent collecting lenses;

FIG. 9

a light exit surface of a collecting lens array for a design which is characterized by a preferred shape of the recesses in the pinhole;

FIG. 10

the effect of the preferred embodiment;

FIG. 11

a view of the light exit side of a m = 4 rows and n = 10 columns of collecting lenses having collector lens array

FIG. 12,

a cross section of the article of FIG. 11 ; and

FIG. 13

the object of FIGS. 11 and 12 in an isometric view.

In this case, the same reference symbols in different figures denote the same or at least functionally identical elements.

FIG. 1 shows an embodiment of a motor vehicle headlight 10 according to the invention. The motor vehicle headlight has a housing 12 with a light exit opening, which is covered by a transparent cover 14. When the headlamp is used as intended, the light exit opening faces the direction of travel x. The y-direction is parallel to a transverse axis of the vehicle and the z-direction is parallel to a vertical axis of the vehicle. FIG. 1 shows the headlamp therefore in a plan view, the headlamp is cut open and the cutting plane is horizontal.

The illustrated headlight has a light source field 16, that here n = 3 light sources 16.1, 16.2, 16.3 contains. The number n of the light sources is preferably greater than n = 3. Each of the light sources is adapted to emit light in a light beam 20 having a main light emission direction 18. The light sources are preferably each semiconductor light sources, in particular light emitting diodes. It is also preferable that the LEDs have a flat light exit surface. The emitted light beams then have approximately a Lambertian radiation characteristic, which is represented in each case by the representation of the bundles as circles. The length of the directional arrows lying within a circle is then known to indicate the radiation intensity prevailing in this direction. Each circle illustrates a single bundle of light.

FIG. 1 also shows a collecting lens array 22, which has for each of the n = 3 light sources exactly one converging lens 22.1, 22.2, 22.3, which is associated with the respective light source. The assignment takes place in that a light entry surface of this converging lens lies in the light beam emanating from this light source, and the main light emission direction of this light source intersects. This definition results in a clear assignment. The FIG. 1 shows an example of such an association. The collecting lens array 22 has a light entry side 26 and a light exit side 28.

With correspondingly wide opening angles of the light bundles, it could happen that scattered light from a light source falls onto the light entry side of a collecting lens not assigned to this light source, where it is coupled into this condenser lens and through in this condenser lens resulting internal total reflections is deflected so that it is incident in an adjacent light entrance surface. To prevent this, the headlight according to the invention and also in the FIG. 1 illustrated embodiment, at least one aperture 24 which is arranged on the light entrance surface side of two directly adjacent collecting lenses so that it shadows the light entrance surface of the one of the two converging lenses against light of an adjacent light source, which is assigned to the other of the two directly adjacent arranged collecting lenses is.

The individual converging lenses are preferably designed by their shape and arrangement to reduce the opening angle of each incident light on them. In this case, it is particularly preferred that the converging lenses are shaped and arranged such that the light fields forming on the light exit side 28 of the collector lens field when the light sources are switched in contact, but do not overlap. The sum of these light fields represents an internal light distribution, which is converted by a secondary optics 30, which may be realized as a converging lens or reflector, in an external light distribution, which adjusts in front of the headlight and thus in front of the motor vehicle having this headlight. The inner light distribution corresponds to the intermediate image mentioned earlier.

FIG. 2 shows an optical system of a specific embodiment of a headlamp or light module of the headlamp according to the invention together with various levels and a measuring screen 32 which extends along a horizontal direction H and a vertical direction V. For the intended use of the headlamp in a motor vehicle Therefore, the arrangement of the screen corresponds to the arrangement of a vertically upstanding from the road ahead of the vehicle wall.

At the subject of FIG. 2 are the light source field and the collecting lens field of the FIG. 1 mounted on a heat sink 34 together with a serving for controlling and supplying the LEDs with electrical energy board. Furthermore, this assembly still contains the inventively provided at least one aperture, which in the size ratios of FIG. 2 but not recognizable. The assembly of heat sink, circuit board, light source field, aperture and collecting lens field forms a so-called replacement light source 36.

At the subject of FIG. 2 serves a parabolic reflector 30.1 as secondary optics 30. The special parabolic reflector of FIG. 2 has three facets 38.1, 38.2, 38.3. Each two of the facets are separated by distances which lie in a plane which is parallel to a horizontal plane 40. The reflector 30.1 can also be referred to as a horizontally faceted reflector.

The secondary optics system may comprise, for example, a parabolic mirror, in particular a faceted parabolic mirror, the focal point of which lies on the light exit surface of the primary optic array. The parabolic reflector is faceted so that all facet surfaces are approximately equal distances to the common focus. All facet edges facing away from the optical axis (rotation axis) of the light module have greater distances to the common reflector focal point than the facet inner edges, which lie on the side of the optical axis. The facet edges perpendicular to the light-dark boundary of the light distribution (ie vertical light-dark boundary in the striping light → horizontal facet edges). The facet edges can also be annular and run concentrically around the optical axis (rotation axis) of the reflector.

The replacement light source 36 and the parabolic reflector 30.1 are arranged relative to each other so that the parabolic reflector is focused on the light exit surface of the collecting lens array of the complex light source 36. Thus, focal points 37 of the parabolic reflector are not located in the light exit surfaces of the light-emitting diodes, but in the light exit surface 28 of the collector lens field, which coincides with the light exit surface of the replacement light source 36.

On the light exit surface of the collecting lens array, a switched-on light-emitting diode generates a single bright light field, wherein the bright light fields generated by adjacent light-emitting diodes adjoin one another, but have no overlap. The sum of the individual bright light fields represents a primary, lying in the interior of the headlamp light distribution, which is realized by the secondary optics, which can also be referred to as projection optics and here by the parabolic reflector 30.1, in a prior to the headlight secondary light distribution is transferred.

In the FIG. 2 represents the secondary light distribution on a screen and has six horizontally adjacent, but not overlapping, light fields 48, each of which forms an image of a single light field of the primary light distribution, which is established on the light exit surface of the collecting lens array. Accordingly, in the in FIG. 2 illustrated embodiment, the number n of the light sources and converging lenses each equal to 6. If you turn off a light source and the adjacent light sources are turned on, creates a darkened area in the outer light distribution. A road user who is in this darkened area is therefore not blinded.

An optical axis 44 of the light module or of the optical system lies here in the intersection of a vertically arranged meridional plane 42 and a horizontally arranged sagittal plane 40. The optical axis 44 is perpendicular to the screen 32 and pierces it at the point (H = 0, V = 0). The terms horizontal and vertical here, as in the entire present application, always refer to the stated intended use of a headlamp in a motor vehicle on a flat road surface. Horizontal directions are parallel to the horizon; vertical directions are perpendicular to the horizon on the flat roadway.

The lying within a light field 48 of the secondary light distribution 50 and substantially horizontally extending lines 52 are lines of equal brightness (isolux lines), the brightness of a maximum, here prevailing at the level of the horizon brightness decreases up and down. The illumination of the light fields 48 extending far above the horizon shows that it is a high-beam light distribution. A main emission direction 49 lies in the meridional plane and points into the center (H = 0, V = 0) of the light distribution.

FIG. 3 shows a further embodiment of an optical system of a headlight according to the invention. The object of FIG. 3 differs from the subject of FIG. 2 essentially by the fact that the secondary optics, which in the subject of the FIG. 2 is realized as a horizontal faceted parabolic reflector 30.1, the subject of the FIG. 3 is realized as a converging lens 30.2. Incidentally, the explanation of the FIG. 2 also for them FIG. 3 ,

FIG. 4 shows the replacement light source 36. This shows FIG. 4a the spare light source in an assembled state, and FIG. 4b shows the spare light source in a disassembled state. The light source field 16 is located on the circuit board 54. The at least one aperture 24 is preferably a pinhole in the form of a plate which is arranged between the light source field 16 and the collecting lens array 22 and which has a diaphragm web for each pair of adjacent light sources of the light source field ,

In the embodiment, in the FIG. 4 is shown, the pinhole 24 has a number of recesses which is identical to the number of light sources of the light source field. The recesses are arranged in the pinhole just so that in the mounted state exactly one recess of the pinhole in front of a light exit surface is exactly one light source of the light source field.

The webs lying between adjacent recesses form in this embodiment in each case a diaphragm which is arranged on the light entry surface side of two directly adjacent collecting lenses so that it shades the light entry surface of the one of the two converging lenses against light of the light source, the other of the two each other directly adjacent is assigned arranged collecting lenses.

The diaphragm webs are preferably arranged centrally between each two adjacent light-emitting diodes. They preferably have at least the same width as the light exit surfaces of the light-emitting diodes. The screen webs are made of opaque material. This is true for all embodiments.

The collecting lens array 22 is preferably a one-piece cohesively coherent component, which consists of transparent material and is shaped so that for each light exit surface of the light emitting diode 16 of the light source field results in a converging lens, which is associated with the respective light source characterized in that a light entrance surface of this convergent lens in is the outgoing light beam from this light source and the Hauptlichtabstrahlrichtung this light source intersects.

The fixing of the relative positions of the light source, diaphragm webs and converging lenses is preferably carried out by form-locking elements. In the illustrated embodiment, these are screws 56 and provided for receiving and carrying the screws recesses 58 in lying outside the light exit surface edge regions of the collecting lens array 22, the pinhole 24, the light source field 16, the circuit board 54 and the heat sink 34. The circuit board has a connector component 60th , which is adapted to be connected to a complementary plug component of a connecting cable.

FIG. 5 shows a view of a light exit surface of a collecting lens array 22, which contains n = 6 converging lenses 22.1 to 22.6. In addition, shows FIG. 5 the one in this view behind the convergent lens light exit surfaces of the LEDs 16.1 to 16.6. Without the inventively provided aperture, the following disturbing effect has been shown. When the external light sources 16.1, 16.6 and switched off internal light sources 16.3, 16.4 radiate the two innermost light sources serving as light emitting diodes from a certain brightness, so that their light fields can not darken as much as the light fields between the innermost, off light-emitting diodes and the switched outermost LEDs lying further LEDs 16.2 and 16.5.

It has also been shown that this unwanted creeping often occurs in de-energized light emitting diodes of a light source field, which are arranged separated by a switched light emitting diode of the same light source field by a further switched off light-emitting diode. It has been found that this illumination is caused by the fact that light of a switched-on light-emitting diode by an undesirable, in the collecting lens array 22 transport process in the phosphor layer of a switched on light emitting diode (for example, 16.1) next adjacent and off LED (for example, 16.3) is incident and this phosphor layer stimulates to glow.

FIG. 6 shows a cross section through the subject of the FIG. 5 which illustrates the genesis of this undesirable effect. Stray light 62 originating from an outer edge region of the light bundle 61 emitted by the outer light source 16.1 falls onto the light entry surface of a converging lens 22.2 of the adjacent light-emitting diode 16.2. This coupled scattered light falls below at such shallow angles to the light exit surface 28.2 of this converging lens 22.2, that it is not from the Light exit surface of this converging lens is coupled out, but is redirected to the light entrance side 26 of the collecting lens array.

Due to the flat or at least less curved than the light exit side 28 light entrance side 26 of the collecting lens array, the scattered light 62 is then coupled out via the light entrance side 26 of the collecting lens array 22, the light sources 16, this effect is particularly due to the plano-convex design of the individual converging lenses is facing. As a result, this coupled-out light 62 then falls on the light exit surface of the next but one light emitting diode 16.3, coupled there in the phosphor layer of this light emitting diode and stimulates this phosphor layer to illuminate.

The light rays 64 emanating from this illuminated by the LED concerned, which are thus not generated in particular by a controlled current flow through the light emitting diode 16.3 fall over the light entrance surface of the associated light source converging lens 22.3 in the collecting lens field and lead to the unwanted brightening of the associated light field , In the FIGS. 5 and 6 This undesirable light transport taking place via a converging lens of a further light-emitting diode lying between two light-emitting diodes is represented by the arrows 62.

FIG. 7 shows the subject of the FIG. 5 with an inventively provided aperture 24, which prevents unwanted coupling of stray light of a light source 16.1 in the converging lens 22.2 of an adjacent light source 16.2. The opaque diaphragm webs 24.1, 24.2, 24.3, 24.4 and 24.5 of the diaphragm 24, the between the individual light sources 16.1, 16.2, 16.3, 16.4, 16.5 and 16.6 prevent, in particular, that scattered light 62 switched LEDs (for example, 16.1) on the phosphor layer turned off, over the next adjacent LEDs (for example, 16.3) passes. The diaphragm webs are preferably located between the light entry surface 26 of the collector lens field and the in FIG. 8 illustrated light exit surface 17 of the light source field 16th

It is further preferred that a width of the diaphragm webs have at least the width s of the light exit surfaces of the light emitting diodes to be screened, so that the switched off light emitting diodes are in the shadow of the diaphragm webs. With this width, the diaphragm webs extend along the light exit surface of the light emitting diode that is parallel to the shading diaphragm edge of the constriction and that is arranged in the recess.

The width s of the light exit surfaces of the light-emitting diodes is usually between 0.3 mm and 2 mm for light-emitting diodes currently used for motor vehicles. It is understood, however, that the invention is also applicable to a headlamp with LEDs with deviating from these dimensions width s.

FIG. 8 shows a section through the subject of FIG. 7 and shows in particular diaphragm webs 24.1, 24.2, 24.3, 24.4 and 24.5, which lie on the light entry surface side 26 of the collective light field 22 between the individual light sources 16.1, 16.2, 16.3, 16.4, 16.5 and 16.6 and there in particular between each two directly adjacent collecting lenses so are arranged to shade the light entrance surface of the one of the two converging lenses against light of the light source, the other of the two directly adjacent to each other is assigned arranged collecting lenses. Like a comparison of FIGS. 5 and 6 on one side with the FIGS. 7 and 8 on the other hand, the unwanted transport of stray light 62 is effectively prevented by the aperture 24.

FIG. 9 shows a light exit surface of a collecting lens array for an embodiment, which is characterized by a preferred shape of the recesses 70.1, 70.2, 70.3, 70.4, 70.5 and 70.6 in the pinhole 24. The recesses are each separated by a lying between two adjacent recesses aperture web. The preferred shape of the recess is characterized by the fact that its clear width in a direction in which a plurality of light emitting diodes 16. 1, 16.2, 16.3 and so on in a row next to each other, is smaller than in all other directions. In the FIG. 9 is this direction, in which a plurality of light exit surfaces are adjacent to each other, extending along the section line XX direction.

As a result, there are the inner recesses 70.2, 70.3, 70.4 and 70.5 of the series in the form of eight, so formed with a constriction, so that one could also speak of a bone shape of the recesses. The constriction is approximately as long as the width s of the parallel to the shading diaphragm edge light exit surface of the light emitting diode, which is arranged in the recess. With this length, the constriction extends along the parallel to the shading diaphragm edge of the constriction lying light exit surface of the light emitting diode, which is arranged in the recess. The constriction is preferably where the light-emitting diode is, which is preferably arranged centrally in the recess.

The outer recesses 70.1, 70.6 are constricted there on one side, the one-sided constriction facing the adjacent light-emitting diode. This constriction is preferably only as large as the width of the light exit surface of the light-emitting diode, which is to be shaded by the diaphragm. By the size of the constriction is meant the length of an edge along which the recess is constricted. On the one hand, this embodiment minimizes the unwanted excitation of neighboring or superimposed neighboring LEDs for illumination. On the other hand, these embodiments in other directions, preferably in all other directions, avoid unnecessary shading of the light beam.

The avoidance of unnecessary shadowing is advantageous because it reduces the efficiency losses inevitably associated with the use of the shutter. As an alternative to the constricted shape, the recess may e.g. also be rectangular, round or elliptical, without this enumeration is to be understood as final. In these cases, however, not only stray light, but also usable luminous flux is shaded, which is undesirable for efficiency reasons. In simpler embodiments, the apertures are alternatively rectangular or square, wherein the sides can be curved. It is also preferable that different openings have different contours.

FIG. 10 illustrates the effect of the preferred embodiment. Scattered light 62, which could potentially couple into adjacent converging lenses, is effectively shaded by the aperture webs 24.i close to the light emitting diode, i being an index running from i = 1 to 5 in the illustrated embodiment. This is in the FIG. 10 represented by the short arrows.

Light which is emitted in directions in which undesirable coupling into adjacent convergent lenses is not to be feared is not shaded. This is in the FIG. 10 represented by the bundles 61. The width b of the constriction of the recess preferably corresponds to the width of the s of the light-emitting diodes in the direction of the row arrangement.

FIG. 11 shows a view of the light exit side 28 of a m = 4 rows and n = 10 columns of collecting lenses having collector lens array. The values of n and m can also differ from 4 and 10. However, these values are preferably greater than or equal to 3. In addition, n can also be equal to m. Because of the multi-line arrangements, the square apertures having the dimensions bxb are constricted in two directions, so that particularly small clearances b can be ensured to the nearest neighbors in the vertical and also in the horizontal direction. The light exit surfaces of the light sources are here square with an edge length s, where s is slightly smaller than b. The size B indicates the grid dimension of the arrangement, which corresponds for example to the distance of the center points of the light exit surfaces of two adjacent light sources.

This embodiment, whose cross section in FIG. 12 is shown in particular also characterized by the fact that the opaque aperture material is embedded in the transparent lens material. This is especially true in the FIG. 12 clearly showing, for example, embedded in the transparent material of the collecting lens panel aperture web 24.j. This type of embedding is independent of this particular embodiment preferred for all embodiments of the present invention. The associated The advantage consists in a mechanical stabilization of the collecting lens field by the material of the diaphragm, which is stronger than that of the material of the collecting lens field.

It also applies to all exemplary embodiments that a metallic material is preferably used as the diaphragm material. Such a metallic pinhole gives the arrangement a desired stability. This is particularly advantageous if mechanically non-stressable material such as silicone rubber is used for the collecting lens field. In addition, metal panels can be finished with the required accuracy of the openings, for example by punching or laser cutting.

FIG. 13 shows the subject of the FIGS. 11 and 12 in a perspective view. It is also preferred that the aperture 24 has a solderable surface. The particular advantage of this embodiment is that the diaphragm can then be soldered together with the collecting lens array on the board 54 of the light emitting diodes with. The diaphragm 24 preferably has a U-shape. At the ends of the U-legs facing away from the bottom of the U-shape, the diaphragm has holding means with which it can be fastened to the circuit board 54. The holding means are, for example, plate-shaped or plate-shaped feet 80, which extend transversely to the U-legs and with which the aperture can be soldered as SMD (surface mounted device) together with the light-emitting diodes to the board. In this embodiment, the light sources and the overlying on the panel or the aperture as an embedded part having collecting lens array subject to the same systematic positional tolerances caused by the solder paste and the solder resist. These positional tolerances are compensated automatically.

Claims (15)

Motor vehicle headlight (10) having a light source field (16) having at least three light sources (16.1, 16.2, 16.3) arranged in pairs, each of the light sources being adapted to emit light in a light beam (20) having a main light emission direction (18), and with a collecting lens array (22), which has for each of the at least three light sources exactly one converging lens (22.1, 22.2, 22.3) associated with the respective light source in that a light entry surface of this convergent lens lies in the light beam emanating from this light source and the Main emission of this light source cuts, characterized in that the headlamp has at least one aperture (24) which is arranged on the light entrance surface side of two directly adjacent collecting lenses so that it shadows the light entrance surface of the one of the two converging lenses against light, the other the two is associated with each other directly adjacent arranged collecting lenses. Headlamp (10) according to claim 1, characterized in that the at least one diaphragm (24) is a plate-shaped perforated plate which is arranged between the light source field (16) and the collecting lens array (22) and which has a diaphragm web (24) for each pair of adjacent light sources of the light source field. i). Headlight (10) according to one of the preceding claims, characterized in that the diaphragm (24) is a pinhole having a number of recesses which is identical to the number of light sources of the light source field, wherein the recesses in the pinhole just so arranged are that in the assembled state exactly one recess of the aperture in front of a light exit surface exactly one light source of the light source field and that lying between adjacent recesses aperture webs are arranged on the light entrance surface side of two directly adjacent collecting lenses so that they the light entrance surface of the one shadows two converging lenses against light from the light source, which is associated with the other of the two mutually directly adjacent collecting lenses. Headlamp (10) according to one of the preceding claims, characterized in that the diaphragm webs are arranged centrally between each two adjacent light sources Headlamp (10) according to any one of the preceding claims, characterized in that the collecting lens array (22) is a one-piece cohesively coherent component which consists of transparent material and is shaped so that for each light exit surface of the light-emitting diodes of the light source field (16) Conjunctive lens that gives the respective light source is associated with the fact that a light entry surface of this converging lens is located in the outgoing light beam from this light source and the Hauptlichtabstrahlrichtung this light source intersects. Headlight (10) according to one of the preceding claims, characterized in that a width (b) of the diaphragm webs corresponds at least to the width (s) of the light exit surfaces of the light emitting diodes to be screened. Headlamp (10) according to one of the preceding claims, characterized in that the aperture has at least one constriction having recess, wherein the constriction is as wide as the width (s) of the parallel to the diaphragm edge light exit surface of the light emitting diode, which is arranged in the recess is. Headlight (10) according to any one of the preceding claims, characterized in that the constriction is located where the LED is located, which is preferably arranged centrally in the recess. Headlamp (10) according to one of the preceding claims, characterized in that the diaphragm has at least one recess 70.1, 70.2, which is constricted on one side facing a neighboring LED side and is not constricted on the opposite side of this side. Headlight (10) according to one of the preceding claims, characterized in that the clear width (b) of the constriction of the recess corresponds to the width (s) of the light-emitting diodes in the direction of the row arrangement. Headlamp (10) according to one of the preceding Claims, characterized in that the opaque aperture material is embedded in the transparent lens material. Headlight (10) according to one of the preceding claims, characterized in that the diaphragm material is a metallic material. Headlamp (10) according to one of the preceding claims, characterized in that the diaphragm (24) has a solderable surface. Headlight (10) according to one of the preceding claims, characterized in that the diaphragm (24) has a U-shape. Headlight (10) according to any one of the preceding claims, characterized in that the diaphragm (24) has at the ends facing away from the bottom of the U-shape ends of the U-leg holding means, with which it on the circuit board (54) can be fastened.

Images