DE102010025557A1 - Light module for a headlight of a motor vehicle - Google Patents

Abstract

The invention relates to a light module (10) for a headlight of a motor vehicle. The light module (10) comprises at least one light source (16) for emitting light, at least one primary optics (14) for bundling at least part of the emitted light, at least one secondary optics (26) for projecting at least a part of the bundled light as a light distribution onto one Roadway in front of the vehicle, and at least one roller-like diaphragm element (22) with a longitudinal extension along a longitudinal axis (28) of the diaphragm element (22), which runs horizontally and transversely to an optical axis (42) of the light module (10). The diaphragm element (22) can be rotated about the longitudinal axis (28), different contours being formed on an outer circumference of the diaphragm element (22), which can be moved into the beam path when the diaphragm element (22) is rotated and each have an effective upper edge profile of the diaphragm element (22 ) form. In order to increase the number of diaphragm contours formed on the diaphragm element (22) without restricting the vertical extent of the resulting light distributions, the invention proposes that at least part of the outer circumferential surface of the roller-like diaphragm element (22) be provided with a mirror coating (44) is.

Description

The invention relates to a light module for a headlight of a motor vehicle. The light module comprises at least one light source for emitting light, at least one primary optics for bundling at least part of the emitted light, at least one secondary optic for projecting at least a part of the collimated light as light distribution onto a roadway in front of the vehicle. The light module additionally comprises at least one roller-like diaphragm element with a longitudinal extent along a longitudinal axis of the diaphragm element. The longitudinal axis is horizontal and transverse to an optical axis of the light module. The diaphragm element is rotatable about the longitudinal axis. On an outer periphery of the diaphragm element different contours are formed, which are movable during rotation of the diaphragm element in the beam path and each form an effective upper edge profile of the diaphragm element. Moreover, the invention relates to a headlight for a motor vehicle with such a light module.

Various lighting devices for motor vehicles are known from the prior art. Headlamps are beside lights a part of the lighting equipment. While lights are primarily for the visualization of the vehicle for other road users, headlights are primarily to improve the visibility for a driver of the motor vehicle. For this purpose, headlights usually emit light in the direction of travel or at an angle to it. They are located in the front of a vehicle and are used in addition to road safety by visualizing the vehicle for other road users in particular the illumination of the road ahead of the vehicle, eg. B. in the form of a low beam, high beam, fog light, Teilfernlicht-, or danger marking light distribution and in the form of adaptable to specific environmental situations and / or vehicle conditions light distributions, such as. A cornering, city lights, Landstraßenlicht-, motorway light distribution, etc. , in each case to improve the visibility for the driver.

Headlamps comprise at least one light source in the form of an incandescent lamp, gas discharge lamp or one or more semiconductor light sources. They can work according to a reflection principle, whereby light emitted by the light source is reflected by a reflector onto the roadway in front of the vehicle to produce a desired light distribution. To generate a substantially horizontal bright-dark boundary of a dimmed light distribution, the light source has a diaphragm, or the reflector is designed so that the dimmed light distribution is generated without additional aperture alone by reflection of the emitted light from the light source. Alternatively, the headlights can operate according to a projection principle, wherein light emitted by the light source after bundling by a primary optics, for example. In the form of a reflector or an optical attachment, to produce the desired light distribution by a secondary optics, eg. In the form of a projection or condenser , is projected onto the roadway in front of the vehicle. To produce a dimmed light distribution, an aperture element with an effective upper edge located in the beam path can be arranged between the primary and the secondary optics. The upper edge is displayed by the secondary optics as a bright-dark border on the road ahead of the vehicle. The light source, primary optics, secondary optics and the diaphragm element can be combined to form a light module.

The headlights comprise a housing in which at least one light module is arranged to produce one or more desired light distributions. A specific light distribution can be generated by a single light module, but it can also be generated by superposition of the partial light distributions generated by a plurality of light modules. A light module can generate one or more light distributions. The housing has a light exit opening, which is closed by a transparent cover glass or plastic. The cover pane can be designed as a clear pane without optically active profiles (eg prisms) or at least in regions with optically effective profiles (so-called diffusion pane).

In the known headlamps are often also lighting functions such. B. position light, high beam, flashing or daytime running lights with integrated. However, these lighting functions can also be realized as a separate light in the motor vehicle.

To produce a substantially horizontal bright-dark boundary, for example in the case of dipped beam or fog light, a diaphragm element is known to be arranged in the headlamps operating according to the projection principle in the beam path between primary and secondary optics. The bright-dark boundary comprises, for example, an asymmetrical bright-dark border with a lower section on the oncoming traffic side and a contrasted elevated section on the own traffic side. Between the sections, for example, there is a transition in Europe with a 15 ° increase, for example in the USA a transition with a gradual increase and in other countries with an otherwise formed increase. In this case, the diaphragm element can be arranged essentially perpendicular to the optical axis of the light module, or it can be arranged substantially horizontal. For example. from the EP 1 357 334 B1 is a horizontal one lying aperture element is known, which is mirrored to improve the light intensity in particular a low beam distribution. The mirror surface of the horizontal diaphragm element extends from a focal plane or Petzval surface of the secondary optics (the projection lens) in the direction of a primary optic (the reflector). As a result, the illuminance can be increased in an area directly below a substantially horizontal light-dark boundary.

A Petzval surface is a spherical or spherical surface on which, in the case of a real lens, images of individual points of an object arranged in a plane are imaged by the lens. In other words, when using a real lens to create an image of an object arranged on a plane, the images of individual points of the object do not arise in a plane, but in a first approximation on a spherical surface. It follows from the reversibility of the light path that a sharp or precise image of an object is obtained in the plane when the object to be imaged is arranged on a curved or curved surface of the imaging system, the so-called Petzval surface. Therefore, screens of projection modules for producing a dimmed light distribution (eg PES diaphragms) are sometimes not flat, but rather bent.

By the EP 0 935 728 B1 is an aperture element known, which is formed roller-shaped. It is arranged with a longitudinal extent along a longitudinal axis horizontally and transversely to an optical axis of the light module. In this case, the roller-like diaphragm element is rotatable about the longitudinal axis. On an outer periphery of the diaphragm element different contours are formed, which move different upper edge profiles as an effective upper edge into the beam path of the light module during rotation. The roller-like diaphragm element of the known type is motorized, z. B. driven by a stepper motor and has on its outer periphery light-absorbing material.

The more different differing Abblendlicht- and high beam distributions in their vertical extent, the larger are in the roller-like diaphragm member and the corresponding radial jumps between the distributed on the outer circumference of the roller-like diaphragm element diaphragm contours. The greater the radial jump between two successive diaphragm contours, the greater must be the angle between them on the outer circumference of the roller-like diaphragm element, so that they can be imaged independently of each other by the secondary optics, d. H. the following contour does not cast any disturbing shadows on the light distribution.

Especially the change between dipped beam and main beam or between dipped beam and partial high beam require a lot of space on the visor body and require large adjustment angles between the respective lighting functions. This disadvantageously leads to the fact that either the number of different light functions or the vertical extent of the individual light distributions is limited by the diameter of the diaphragm body (for example limiting the high beam distribution to 2 ° -3 ° vertically). The roller-like diaphragm element can not be increased arbitrarily, since a larger roller diameter with losses in the light distribution, especially at the range, accompanied, because more and more light rays are absorbed on the large surface roll surfaces. Thus, with large roller diameters, only the beam bundles contribute to the light distribution, in particular to the range, which are reflected by the primary optics into an area in the vicinity of the optical axis, ie the light beams from a horizontal section of the reflector lying close to the optical axis. Radiation from the upper and lower reflector areas, which lie at a greater distance from the optical axis, however, are largely absorbed by the diaphragm roller or must be directed into a headlight apron directly in front of the vehicle.

The more functions are arranged on the shutter roller, the harder it is to light in those areas of the light distribution that produce a long range, ie in the vicinity of the bright-dark border, and in the areas that optimally adapted to a specific driving situation by a variation to be adapted. If, in particular, the light distributions for high-beam, partial high-beam or for the danger marker light are limited to, for example, 2 ° -3 ° vertically, this leads to a considerable loss of comfort (the so-called "tunnel effect"), which is particularly the case with headlights for Vehicles from the upper class is not acceptable. The driver of a vehicle has the subjective feeling of driving through a tunnel, since only a very limited area is illuminated at the top. The limitation of the high beam, sub-beam or marker light distribution to a few degrees vertical is subjectively considered by the driver of the vehicle as depressing and disturbing.

Based on the described prior art, the present invention has the object to solve the above conflict, in particular the known roller-like diaphragm element to design and further develop that on the one hand with a comparable roller diameter, a larger number can be achieved at different light distributions, without it on the other However, in the individual light distributions to a limited vertical extent and the so-called. "Tunnel effect" comes.

To solve the problem is proposed starting from the light module of the type mentioned that at least part of the outer peripheral surface of the roller-like diaphragm element is provided with a reflective coating. The longitudinal axis of the roller-shaped diaphragm element is preferably arranged between the secondary optics and their focal plane or Petzval surface. The mirror surface thus lies behind the focal plane or Petzval surface of the secondary optics (eg the projection lens) in the light exit direction and extends into the area between the focal plane or Petzval surface and secondary optics. As a light source are preferably gas discharge lamps, the use of incandescent or semiconductor light sources is also possible.

Advantageously, the contours formed on the outer circumference of the diaphragm element are arranged within a cylindrical envelope. Preferably, the cylinder axis of the cylindrical envelope corresponds to the longitudinal axis of the diaphragm element. The aperture diameter of the roller-like diaphragm element is accordingly the diameter of the enveloping cylinder. As the axis of rotation of the diaphragm element can serve the cylinder axis.

In the known roller-shaped diaphragm element, a certain part of the light rays emitted by the light source is absorbed by the outer peripheral surface in each rotational position of the diaphragm element, d. H. only part of the light emitted by the light source actually passes to generate the desired light distribution on the road ahead of the vehicle. The invention is based on the idea to improve the effect of the light module at least for a preferred light distribution by selectively arranged reflective coatings on the peripheral surface of the roller-like diaphragm element. The mirror coating must be designed so that in a certain preferred rotational position of the diaphragm element, the reflected light rays from the reflection can participate in the generation of light distribution on the road ahead of the vehicle. In this way, the efficiency of the light module can be improved.

For example, light rays that are reflected, for example, at the reflective coating of the diaphragm element, can strike a reflector surface of a primary optic embodied as a reflector and then participate in generating the desired light distribution from there. This means that the light beams reflected at the mirroring of the diaphragm element can be used to increase the illuminated area in the horizontal and / or vertical direction, to increase the illuminance in certain areas within the light distribution.

It is conceivable that a partial region of the diaphragm element, which is responsible for illuminating a region of the light distribution above a substantially horizontal light-dark boundary of a dimmed light distribution, is at least partially mirrored. The mirror coating can thus support, for example, a high beam distribution, split beam distribution or hazard marker light distribution or a high beam-like light distribution by increasing a vertical extent of the light distribution on the road and / or correspondingly increasing the light intensity above the light-dark boundary. For this purpose, the mirrored portion of the diaphragm element between the secondary optics and the focal plane must be arranged. As a result, light beams from the light module can reach the desired range of light distribution. The reflection of the diaphragm element increases the extent of the light distribution, in particular a high beam distribution, in the vertical direction. This leads to a good view of the driver of the motor vehicle in the high beam area and therefore contributes significantly to reducing the so-called. "Tunnel effect" and to improve the traffic safety. In the process, the comfort of the headlamp of his motor vehicle, which is subjectively perceived by the driver, is also increased.

For the embodiment of the roller-shaped diaphragm element of the light module, this means that the portion of the diaphragm element which is responsible for the illumination of the area of the light distribution above the light-dark boundary, a circular segment-shaped or circular segment-like section with a plane in a vertical section parallel to the optical axis or curved base surface, wherein the diaphragm element is rotated in a basic position for generating the desired light distribution about the longitudinal axis such that the base surface in the vertical section viewed is aligned substantially parallel or inclined to the optical axis. Decisive for the design and arrangement of the base of the diaphragm element is that as many rays of light from the primary optics meet the mirrored portion of the diaphragm element and the light rays reflected there then pass the secondary optics and can participate in the generation of the light distribution. It is conceivable that the orientation of the planar base of the roller-like diaphragm element for varying the light distribution starting from the basic position can be changed.

Preferably, the flat or curved base surface on the mirroring. In this case, a depth of the circular segment-shaped or circular segment-like section of the partially mirrored diaphragm element is less than a depth of a section of an aperture element without Mirroring should be to produce the said predetermined light intensity. This means that in the mirrored roller-type diaphragm elements, the depth of the peripherally formed recesses for generating a predetermined light distribution over conventional roller-type diaphragm elements can be reduced without mirroring. This is possible because light reflected by the mirroring can be directed into areas of light distribution that would actually be shaded due to the smaller depth of the recesses. This means that, despite the raised upper edge of the panel, there is no reduction in the vertical extent of the light distribution. Due to the reduced depth of the recesses, a larger peripheral surface is available on the roller-type diaphragm element for generating other light distributions. The angular distances between the different diaphragm contours formed on the outer circumferential surface of the diaphragm element can also be selected to be smaller without a light distribution being impaired by the secondary contour.

Alternatively, this also means that with the same functionality, the diameter of the roller-type diaphragm element can be reduced. The diameter of the diaphragm element is defined as a diameter of a cylinder enveloping the diaphragm element.

Furthermore, it is advantageous that the alignment of the base surface is variable by rotating the diaphragm element about its longitudinal axis for varying the light distribution. In this way, for example, the vertical illumination area on the road, in particular the range of the emitted light beam, while driving if necessary, for example, depending on the speed or depending on the meteorological or traffic environment of the vehicle zoom in or zoom out.

The mirrored regions of the diaphragm element can be produced, for example, by vapor deposition, by cathode sputtering (so-called sputtering) or by galvanic or chemical deposition. But it can also be mirror plates or mirror films are applied, for example. By gluing, clamping, welding, rivets, screws, etc. can be attached to the desired areas on the outer circumference of the panel member. In this case, the mirror plates or mirror films may be preformed or pre-bent.

It is also advantageous that the light module comprises at least one sensor, through which a rotational position of the diaphragm element can be observed. Thus, in each case the current rotational position of the roller-like diaphragm element can be detected in a control unit for operating the light module and an exact positioning of the diaphragm element can be ensured by means of a control or a control with setpoint correction.

Further advantages will become apparent from the following description and the accompanying drawings. It is understood that the features mentioned above and those yet to be explained below 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.

Embodiments of the invention are illustrated in the figures and are explained in more detail in the following description. Show it:

1 an inventive light module, partially cut away, in a perspective view;

2 a roller-like aperture element from the light module 1 ;

3 a known light module in a longitudinal section in a position for producing a low-beam light distribution;

4 the well-known light module 3 in a longitudinal section in a position for generating a high beam distribution;

5 a schematic representation of the beam path in the known light module 4 for generating the high beam distribution;

6 one with the light module off 4 and 5 generated high beam distribution, displayed on a screen;

7 a schematic representation of a beam path in the light module according to the invention from 1 for generating a high beam distribution;

8a a first with the light module according to the invention 7 generated high beam distribution, displayed on a screen;

8b a second high-beam distribution generated by the light module according to the invention, shown on a measuring screen; and

9 four different embodiments of the roller-type diaphragm element for use in the light module according to the invention from 1 ,

1 shows a light module according to the invention 10 in a partially cutaway and perspective view. The light module 10 has a frame 12 on which a reflector 14 is arranged. In the illustrated embodiment, the frame 12 through a front edge of the reflector 14 educated. The reflector 14 is preferably ellipsoidal or formed in an ellipsoid shape similar freeform. In one of its possible foci is a light source, preferably a gas discharge lamp 16 arranged. The light module 10 could alternatively also comprise a light bulb or at least one semiconductor light source, in particular one or more LEDs. At the gas discharge lamp 16 is a ignitor 18 for operating, in particular for igniting the gas discharge lamp 16 arranged.

In a light exit direction 20 is after the reflector 14 as a cylindrical diaphragm roller 22 trained aperture element arranged. The iris roller 22 has a substantially horizontal and transverse to an optical axis 42 of the light module 10 extending longitudinal extent and can by a shutter drive 24 around a rotation axis 28 to be turned around. The aperture drive 24 includes in the illustrated embodiment, an electric motor 24a and a spur gear 24b , Of course, the aperture drive 24 be designed differently, for example, with an electromagnetic or piezoelectric actuator instead of the motor 24a , with a worm gear or any other gear instead of the spur gear 24b and / or without gear, so with a direct drive, such as. From the DE 10 2008 022 508 A1 known.

The iris roller 22 has on its outer circumference different contours, each with extension in the horizontal direction and transverse to the optical axis 42 , These can be done by turning the iris roller 22 around the axis of rotation 28 optionally be moved in or out of the beam path of the reflected light. The aperture contour in each case in the beam path forms an effective upper edge courses for forming a horizontal bright-dark boundary of the light distribution on the roadway in front of the vehicle. A detailed description of the iris roller 22 follow below. In light exit direction 20 is in the further course a secondary optics 26 arranged in the form of a projection or converging lens. The secondary optics 26 projects at the diaphragm roller 22 Passed light rays as desired light distribution on the road ahead of the vehicle. This is the effective upper edge of the diaphragm roller 22 from the lens 26 shown as a bright-dark border of light distribution on the road. The iris roller 22 is in the light module 10 essentially in a focal plane 27 the secondary optics 26 (see. 7 ) arranged.

2 shows a detailed view of the diaphragm roller 22 in a certain rotational position. The iris roller 22 has a bearing element at a free end 30 on. On the opposite side of the bearing element 30 has the iris roller 22 a drive element 32 for the aperture drive 24 on. The between the bearing element 30 and the drive element 32 lying region of the diaphragm roller 22 represents the actual effective range 34 the iris roller 22 This is the area that can be moved into the beam path and in which distributed over the circumference, the various diaphragm contours are formed.

This in 2 illustrated aperture element 22 has a diaphragm diameter D, which corresponds to the diameter of the enveloping cylinder. The rotation axis 28 represents the cylinder axis. The in 2 Aperture contour shown is by removing material in the effective range 34 has been generated, so that the aperture contour extends at least partially within the enveloping cylinder. In particular, in the effective range 34 formed differently deep cutouts, which together form the aperture contour shown. Is the upper edge of a suitably formed contour in the beam path of the light module 10 Thus, the contour forms a substantially horizontal light-dark boundary on the road for a completely or partially dimmed light distribution. Because the aperture roller 22 in the focal plane 27 the secondary optics 26 is arranged, the bright-dark border is sharply imaged on the road. By minimally rotating the iris roller 22 around the axis of rotation 28 can the location of the effective range 34 and thus the position and sharpness of the light-dark boundary on the road are changed. By further rotation, a completely different contour for forming a differently configured bright-dark boundary in the beam path of the light module 10 to be brought.

Preferably, those are on the outer periphery of the diaphragm element 22 trained contours within a cylindrical envelope having a diameter D arranged. A cylinder axis of the envelope corresponds to the longitudinal axis 28 of the diaphragm element 22 , Over the peripheral area of the diaphragm roller 22 distributed may be formed a plurality of different aperture contours, each along the axis of rotation 28 extend. The number of possible contours is limited by the diameter D of the diaphragm roller 22 and the depth of the cutouts to create the aperture contours. The smaller the diameter D of the diaphragm roller 22 is, the smaller is the peripheral surface and thus the area available for the arrangement of diaphragm contours. The diameter D of the diaphragm roller 22 However, can not be increased arbitrarily, because otherwise the proportion of the diaphragm roller 22 shaded or absorbed light becomes too large and thereby the efficiency of the light module 10 bad. The deeper the cutouts in the aperture roller 22 for the production of Aperture contour, the greater the vertical extent of the resulting light distribution. For example, it is necessary for a high beam, a split high beam, or a hazardous marker light distribution to have the cutouts in the iris roller 22 are relatively deep, in order to avoid a so-called "tunnel effect". However, the deeper the cut-outs of a diaphragm contour, the greater is the peripheral surface occupied by this diaphragm contour, and the less space is available for further diaphragm contours.

The aim of the present invention is therefore, given a diameter of a diaphragm roller 22 increase the number of aperture contours that can be arranged thereon, and at the same time the vertical extent of the resulting light distributions at which light also reaches a region above a substantially horizontal light-dark boundary of a dimmed light distribution, in particular in a high-beam, partial high-beam light - or a hazard marker light distribution, large enough to avoid the so-called "tunnel effect". Alternatively, for a given number of different diaphragm contours, the aim is to work on a diaphragm roller 22 are formed, the aperture diameter D can be reduced without the "tunnel action" occurring in the various types of high beam distributions. For this purpose, the shutter roller 22 at least partially provided with a mirror coating. In particular, the ablated areas of the effective range 34 in the iris roller 22 of the light module according to the invention 10 at least partially mirrored. Preferably, the portions of a diaphragm contour are mirrored, which allow light to pass for illumination of the long range of a light distribution. These are in particular the areas of the diaphragm contour, which are in a vertical section through the light module 10 considered (cf. 7 ) substantially parallel to the optical axis 42 are aligned. Of course, only a part of the diaphragm roller 22 be mirrored, so that the remaining areas are light-absorbing, that is, a large part of the light is absorbed there and not reflected.

3 shows beam progressions within the light module according to the invention 10 when producing a dimmed light distribution, such as dipped beam, fog light, city light, high street light or highway light, or other adaptive dimmed light distribution. The mode of action of the light module 10 corresponds to the production of the dimmed light distribution of the operation of a known from the prior art light module with a conventional diaphragm roller 22 without reflective coatings. Emits light beams of the gas discharge lamp 16 hit a reflective surface of the reflector 14 and from there towards the secondary optics 26 sent. In this case, the light rays partially the diaphragm roller 22 happen (compare reference numbers 36 ), but they can also from the light-absorbing layer of the diaphragm roller 22 be absorbed (compare reference numerals 38 ). The iris roller 22 is positioned such that by the course of the in the beam path of the light module 10 placed effective upper edge of the peripheral surface of the diaphragm roller 22 the desired dimmed light distribution is generated with a corresponding course and a corresponding position of the bright-dark boundary. The rays of light 36 which the diaphragm roller 22 happen, generate the illuminated area below the light-dark boundary on the roadway in front of the vehicle; through the aperture roller 22 absorbed light rays 38 are largely uninvolved in the generation of light distribution. An increase in efficiency of the light module 10 could be achieved if, in the context of the present invention, the areas of the diaphragm roller 22 to which the rays of light 38 meet, at least partially mirrored would be. In this way, at least part of the light rays would 38 on the reflector 14 be reflected back and could participate in the generation of the dimmed light distribution, for example by the reflected back from the mirroring light beams 38 produce a scattered light distribution, which can illuminate areas above the light-dark boundary with low intensity.

4 shows a known from the prior art light module 10 with a shutter roller 22 , wherein the diaphragm roller 22 is completely made of or coated with a light-absorbing material. The iris roller 22 is positioned so that the light module 10 generates a high beam distribution on the road, so the course of the effective upper edge of the diaphragm element 22 below and at a distance to the optical axis 42 is arranged. The aperture contour for generating the effective upper edge of the diaphragm roller 22 comprises a vertical section parallel to the optical axis 42 considered plane, essentially horizontal area, which is largely parallel to the optical axis 42 extends. It can be seen that light rays in a wide range from secondary optics 26 emerge as intended to produce a proper high beam distribution. A part of the reflected light rays (see reference numerals 40 ), however, encounters light-absorbing material of the flat area of the diaphragm roller 22 and thus can not contribute to the generation of the high beam distribution on the road. These light losses reduce the efficiency of the light module 10 in the high beam function.

For better clarity is in 5 to the light module 10 out 4 a beam path for generating the high beam distribution is shown schematically. Out 5 it is obvious that only such Beams reach the secondary optics, which on a range of the reflector 14 close to the optical axis 42 to meet. From a certain distance of the emitted light rays 40 to the optical axis 42 These can be the aperture element 22 no longer happen, but meet either the directed to the light source back of the iris roller 22 or on the upper flat surface of the diaphragm contour of the effective upper edge. Part of the of the gas discharge lamp 16 emitted light thus strikes the light-absorbing part of the diaphragm roller 22 (compare reference numbers 40 ). The rays of light 40 can thus make no contribution to the generation of light distribution in front of the vehicle.

6 shows one of the light module 10 out 4 or 5 generated high beam distribution 45 on a vertically spaced measuring screen arranged at a defined distance in front of the vehicle. Due to the limited depth of the diaphragm contour of the effective upper edge on the outer peripheral surface of the diaphragm roller 22 has the resulting light distribution 45 only a limited extent in the vertical direction. An area above the light distribution 45 where only very low luminous intensity values are to be measured, is denoted by the reference numeral 43 designated. The high beam distribution 45 So it goes up through the shaded area 43 limited. As a result, the driver of a vehicle whose headlights the high beam distribution 45 generate, the subjective feeling, to drive through a tunnel, since upwards only a very limited area is illuminated. An aperture contour with a greater depth could be the transition between the main beam distribution 45 and shaded area 43 Lift. But that would be on the peripheral surface of the diaphragm roller 22 Clearly reduce available space for additional aperture contours.

7 shows a schematic representation of a beam path of a high beam distribution in the light module according to the invention 10 that with a dimming roller 22 is equipped with at least partially mirrored areas. The iris roller 22 from 7 has in the newly formed portion of the diaphragm contour for generating the high beam distribution (effective range 34 ) a mirroring 44 on. The effective range 34 runs parallel to the optical axis 42 ; but he can also go to the optical axis 42 be inclined. The of the light source 16 sent out and from areas of the reflector 14 farther away from the optical axis 42 lie, reflected light rays 46 hit the mirrored surface 44 , especially in a field between secondary optics 26 and their focal plane 27 , and are reflected there, so that they can participate in an increase in the vertical extent of the high beam distribution. The of the mirroring surface 44 reflected light rays 46 achieve the secondary optics 26 preferably in a region which serves to illuminate the roadway in front of the vehicle, in particular above a bright-dark border of a dimmed light distribution. The Rays 46 be from the mirroring surface 44 reflected in the way they came from a virtual focal point 48 ,

A comparison of 5 and 7 shows that while a pivot 50 the iris roller 22 each the same distance ΔY to the optical axis 42 but the distance ΔY 'is the effective upper edge of the effective range 34 to the optical axis 42 in the light modules 10 from the 5 and 7 differently. In the light module 10 from 5 the distance ΔY is largely identical to ΔY '. The light module 10 from 7 with the mirroring surface 44 in the effective range 34 has a much smaller distance ΔY '; the effective upper edge in the effective range 34 the partially mirrored diaphragm element 22 is much closer to the optical axis 42 positioned as the effective area 34 the conventional diaphragm element 22 without mirroring. In other words, through the mirroring 44 the depth of the aperture contour are reduced. As a result, the diaphragm contour requires a smaller peripheral surface of the diaphragm roller 22 , so that more space is available for the other aperture contours.

8th shows the light module 10 from 7 produced high-beam distribution on a arranged at a distance to the vehicle vertical screen. As in 8th is clearly visible through the at the mirroring 44 reflected light rays 46 an area above the bright-dark border on the road additionally illuminated. Despite the opposite mirrored rollers 22 (see. 5 ) reduced depth of the recesses of the effective diaphragm contour of the mirrored iris roller (see. 7 ) has that of the light module 10 with mirrored roller 22 generated high beam distribution 45 (see. 8a ) approximately the same extension in the vertical direction as that of the light module 10 with iris roller 22 without reflection produced light distribution 45 (see. 6 ). At opposite uncoated blinding rollers 22 Consistent depth of the recesses of the effective diaphragm contour can by the mirroring 44 the shaded area 43 be shifted upwards (cf. 8b ), whereby the vertical extension of the high beam distribution or high-beam light distribution 45 is increased towards the top.

9 shows by way of example four possible embodiments of the diaphragm roller 22 , 9a shows a possible embodiment, for example, to generate a Teilfernlichtverteilung, with only the part of the lane is illuminated with high beam, where no other Road users are. The portion of the diaphragm contour which generates this high beam region is covered by the mirror coating 44 Mistake. The mirroring surface 44 So here is only a partial area of the entire effective range 34 is and is arranged obliquely on the diaphragm roller.

9b shows the shutter roller 22 from 9a in one around the axis of rotation 28 rotated position. In this case, the aperture element 22 adjacent to the in 9a contour shown on another aperture contour to produce a full high beam distribution. This aperture contour one over the axis of rotation 28 and perpendicular to it substantially flat base, over the entire effective range 34 used to generate the high beam distribution. The entire base is covered with a mirror 44 Mistake.

The mirroring 44 on the panel elements 22 of the 9a respectively 9b can be applied for example by vapor deposition, sputtering or by electroplating or chemical deposition.

The 9c and 9d show shutter rollers 22 in which the mirroring 44 over the entire effective range 34 have been realized by mirror plates or mirror films. The mirror plates or mirror films 44 are by riveting on the iris roller 22 attached. Alternatively, they could also be glued, welded, clamped, screwed or otherwise attached to the panel member 22 be attached.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1357334 B1 [0006]
• EP 0935728 B1 [0008]
• DE 102008022508 A1 [0037]

Claims (13)

Light module ( 10 ) for a headlight of a motor vehicle, the light module ( 10 ) comprising at least one light source ( 16 ) for emitting light, at least one primary optic ( 14 ) for bundling at least part of the emitted light, at least one secondary optic ( 26 ) for projecting at least part of the collimated light as light distribution onto a roadway in front of the vehicle, and at least one roller-like diaphragm element ( 22 ) with a longitudinal extent along a longitudinal axis ( 28 ) of the diaphragm element ( 22 ), the longitudinal axis ( 28 ) horizontally and transversely to an optical axis ( 42 ) of the light module ( 10 ) and the aperture element ( 22 ) about the longitudinal axis ( 28 ) is rotatable, and wherein on an outer periphery of the diaphragm element ( 22 ) different contours are formed, which when turning the diaphragm element ( 22 ) are movable in the beam path and in each case an effective upper edge profile of the diaphragm element ( 22 ), characterized in that at least a part of the outer circumferential surface of the roller-type diaphragm element ( 22 ) with a mirror coating ( 44 ) is provided. Light module ( 10 ) according to claim 1, characterized in that on the outer periphery of the diaphragm element ( 22 ) formed contours are arranged within a cylindrical envelope. Light module ( 10 ) according to claim 1 or 2, characterized in that a portion of the diaphragm element ( 22 ), which is responsible for illuminating a region of the light distribution above a substantially horizontal light-dark boundary of a dimmed light distribution, is at least partially mirrored. Light module ( 10 ) according to claim 3, characterized in that the illuminated area of the light distribution above the bright-dark boundary is part of a high beam distribution, divided beam distribution or hazard marker light distribution or a high beam-like light distribution. Light module ( 10 ) according to claim 3 or 4, characterized in that the subregion of the diaphragm element ( 22 ), which is responsible for the illumination of the region of the light distribution above the light-dark boundary, a circular segment-shaped or circular segment-like section with a parallel or inclined in a vertical section to the optical axis ( 42 ) considered planar or curved base surface, wherein the aperture element ( 22 ) in a basic position for generating the light distribution about the longitudinal axis ( 28 ) is rotated, and wherein in the basic position, the base surface viewed in the vertical section substantially parallel or inclined to the optical axis ( 42 ) is aligned. Light module ( 10 ) according to claim 5, characterized in that the orientation of the base surface by rotating the diaphragm element ( 22 ) about its longitudinal axis ( 28 ) is variable to vary the light distribution starting from the basic position. Light module ( 10 ) according to claim 5 or 6, characterized in that the base surface at least partially with the mirror coating ( 44 ) is provided. Light module ( 10 ) according to claim 7, characterized in that a depth of the circular segment-shaped or circular segment-like section of the partially mirrored diaphragm element ( 22 ) is smaller than a depth of a section of an aperture element ( 22 ) would have to be without Verspiegelung for generating said predetermined light intensity. Light module ( 10 ) according to one of the preceding claims, characterized in that the at least partially mirrored portion of the diaphragm element ( 22 ) in a basic position for generating the light distribution between the secondary optics ( 26 ) and a focal plane ( 27 ) or Petzval area of secondary optics ( 26 ) is arranged. Light module ( 10 ) according to one of the preceding claims, characterized in that the mirrored areas ( 44 ) of the diaphragm element ( 22 ) can be produced by vapor deposition, sputtering or by galvanic or chemical deposition. Light module ( 10 ) according to one of claims 1 to 9, characterized in that the mirrored areas ( 44 ) of the diaphragm element ( 22 ) can be realized by mirror plates or mirror films. Light module ( 10 ) according to one of the preceding claims, characterized in that the light module ( 10 ) at least one sensor for monitoring a rotational position of the diaphragm element ( 22 ) about the longitudinal axis ( 28 ). Headlight for a motor vehicle, characterized in that the headlight at least one light module ( 10 ) according to one of the preceding claims.

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