DE102007050206A1 - Projection headlight for vehicle, has aperture device including aperture surface elements partially forming aperture edge contours, where elements are adjustably arranged by piezo-actuating element in extending level of aperture device - Google Patents

Abstract

The headlight has a light source assigned to a reflector, and a lens provided upstream of the reflector in a light beam direction. An aperture device (1) is arranged between the light source and the lens, where aperture edge contours assigned to different light distributions are adjustable by the device. The aperture device has aperture surface elements (2, 3) partially forming the contours. The elements are adjustably arranged by a piezo-actuating element (6) in an extending level of the aperture device in an operating position.

Description

The The invention relates to a projection headlight for vehicles with a reflector, with a reflector associated with the light source, with a lens in front of the reflector in the light emission direction, with a diaphragm device arranged between the light source and the lens, by means of which different light distributions associated Blendkantenkonturen are adjustable.

From the DE 195 37 838 A1 is a projection headlight for vehicles with a reflector, known with a reflector associated with the light source, with a reflector in the light emission direction upstream lens and with an arranged between the light source and the lens aperture device. The diaphragm device has a fixed diaphragm section and a displaceable diaphragm section. The displaceable diaphragm section is adjustable in two operating positions, so that, on the one hand, a low-beam distribution and, on the other hand, a high-beam distribution can be generated. A disadvantage of the known projection headlight that only a limited number of different light distributions can be generated.

From the DE 199 08 641 A1 a projection headlight for vehicles is known, which in addition to a reflector, a light source and a lens has a diaphragm device comprising a diaphragm roller. The diaphragm roller is adjustable about a horizontal and transverse to the optical axis axis of rotation and has such a lateral surface that different Blendkantenkonturen for different light distributions are adjustable.

From the DE 103 05 624 A1 a projection headlight for vehicles is known which comprises a light source, a reflector associated with the light source, a lens arranged in front of the reflector in the light emission direction, and a diaphragm device. The diaphragm device comprises a link chain with a plurality of diaphragm members, which are connected ge articulated. The link chain is dimensioned larger than a front opening of the reflector. The link chain is slidably disposed in the horizontal direction, so that different light distributions associated Blendkantenkonturen of link chain sections can be brought into the aperture space. A disadvantage of the known projection headlamp that the change between two different operating positions of the aperture device is relatively time-consuming, especially when it comes to light distributions, which are generated by means arranged in opposite end regions of the link chain link chain sections.

task The present invention is a projection headlamp for vehicles in such a way that easy on Way a plurality of light distributions reliably adjustable is.

to Solution to this problem is the invention in connection with the preamble of claim 1, characterized in that the aperture device at least one at least the predetermined Blendkantenkontur partially forming aperture element, the by means of a piezoelectric actuator in an extension plane of the Aperture device adjustable in at least one operating position is arranged.

Of the particular advantage of the invention is that by assignment a piezo-actuator to a diaphragm element of a diaphragm device achieved an improved positioning accuracy of the diaphragm device is, wherein means of the aperture device a light-dark boundary Adaptive can be mapped to the street space. Advantageous allows the adjustment of the aperture element by a Piezo actuator a high repeatability in the setting of the diaphragm element in a predetermined operating position, so that long - term stable with frequent changes of the operating positions of the Aperture element a predetermined bright-dark boundary of the corresponding light distribution can be generated.

To a preferred embodiment of the invention are at least two aperture elements in Lichtabstrahlrichtung offset parallel arranged to each other, wherein the predetermined Blendkantenkontur the Aperture device by at least two Blendkantenabschnitte the at least two diaphragm elements is formed. An advantageous relatively sharp glare edge contour to form a cut-off line also when adjusting the cut-off in a transverse to the optical Axis directed direction allows. This is suitable the aperture device according to the invention in particular for photometric adaptive systems or for adjustment dynamically relatively rapidly changing light distributions.

To a development of the invention have at least two aperture elements each complementary to each other arranged Blendkanten on, so that by vertical relative adjustment of the same an asymmetric Low beam distribution for right-hand traffic and asymmetric Low beam distribution for left-hand traffic is formed. This results in an adaptive functionality of the Headlamps, wherein the optically effective glare edge respectively by a single diaphragm element is formed. This can advantageously create a relatively sharp cut-off line.

To a development of the invention is the piezo actuator each arranged in a region of the respective aperture elements, in which the panel elements the largest transverse extent exhibit. Advantageously, the piezo actuator is thus in one focus area of the diaphragm element arranged so that a precise adjustment of the same is made possible.

To a development of the invention includes the aperture device a third diaphragm element with a particular horizontal diaphragm edge, so by overlapping with two more aperture elements a variety of light distributions, such as city lights, Highway light or motorway light distribution can be generated.

To a development of the invention is at least one aperture element designed as a driver-diaphragm element, so that adjustment of the driver diaphragm element in an adjustment direction after detection another element of the same is moved in a common operating position, in the blend edge sections of the two Aperture contribute to the formation of a given light distribution. Advantageously, thereby the positionally accurate adjustment of at least two aperture elements in a preferred operating position, such as a low beam distribution position.

To a development of the invention, the aperture elements are respectively in the vertical direction or one parallel to the optical axis extending horizontal axis adjustable, so that predetermined Light distributions are easily adjustable.

To In a further development of the invention, the diaphragm elements are such arranged in a vertical direction synchronously adjustable that independent of the current pitch angle of the vehicle a predetermined same Light distribution is generated. Advantageously, the inventive Aperture thus to set a given beam range be used, wherein when adjusting the aperture elements in vertical Direction down a larger luminous flux in the road space can be transported.

To In a further development of the invention, the diaphragm elements are as glare surface elements formed, each strip-shaped transversely to the optical Extending axis. Advantageously, thus, the number of aperture elements depending on the number or configuration of the set Light distributions are minimized.

Further Advantages of the invention will become apparent from the other dependent claims.

embodiments The invention will be described in more detail below with reference to the drawings explained.

It demonstrate:

1 a schematic view of a diaphragm device according to a first embodiment,

2 a schematic view of a diaphragm device according to a second embodiment,

3 a schematic view of a glare device according to a third embodiment,

4 a schematic view of a diaphragm device according to a fourth embodiment and

5 a schematic view of a diaphragm device according to a fifth embodiment.

A projection headlight for vehicles has a reflector, not shown, a reflector associated with the unillustrated light source, a reflector not shown in Lichtabstrahlrichtung upstream lens and a diaphragm device 1 according to a first embodiment according to 1 on.

The aperture device 1 is formed of a first panel element 2 and a second aperture element 3 , which are each formed as Blendflächenelemente. The first panel element 2 and the second aperture element 3 each extend strip-shaped transverse to an optical axis and each have an asymmetric blend edge 4 respectively. 5 on. The blend edge 4 of the first panel element 2 serves to generate an asymmetrical low-beam distribution for the right-hand traffic and the glare edge 5 of the second diaphragm element 3 serves to generate an asymmetrical low-beam distribution for left-hand traffic. The glare edges 4 . 5 the first diaphragm element or the second diaphragm element 3 are thus arranged complementary to each other.

In 1 are the first aperture element 2 and the second aperture element 3 shown in an operating position in which the optically effective Blendkantenkontur exclusively by the Blendkante 5 of the second diaphragm element 3 is formed. The first panel element 2 and the second aperture element 3 is each a piezo actuator 6 assigned as an actuator, so that the same in a vertical adjustment direction 7 independently of one another in a direction perpendicular to the optical axis Extension plane (extension plane of the aperture device 1 ) are adjustable.

For adjusting the aperture device 1 in a second operating position, not shown, in which an asymmetrical Abblendlichtverteilung is to be generated for the right-hand traffic, the first diaphragm element 2 in a vertical upward direction and the second aperture element 3 shifted downwards in the vertical direction, with the corresponding piezo actuators 6 can be controlled by means of a control unit, not shown. In this operating position, the optically effective Blendkantenkontur is solely by the blend edge 4 of the first panel element 2 educated.

The piezo actuators 6 are each in a region of the first panel element 2 or the second diaphragm element 3 arranged in which the aperture element 2 . 3 has the largest transverse extent. Preferably, the piezo-actuator is 6 in a region near the center of gravity or one transverse to the extension of the diaphragm element 2 . 3 extending longitudinal center plane 8th attached near area.

According to a second embodiment of a diaphragm device 10 according to 2 is a first aperture element 2 , a second aperture element 3 and a third aperture element 13 provided, which each have a piezoelectric actuator 6 for vertical adjustment of the same in the adjustment 7 assigned.

Same Components or component functions of the embodiments are provided with the same reference numerals.

For simplified representation of the aperture elements 2 . 3 . 13 are the same in 2 shown superposed. The third aperture element 13 has a horizontal blend edge 14 and is formed as a rectangular Blendeflächenelement. The aperture elements 2 . 3 . 13 are in Lichtabstrahlrichtung, that is transverse to the plane of extension of the diaphragm elements 2 . 3 . 13 , offset from one another. The aperture elements 2 . 3 . 13 thus extend to each other in parallel Erstre ckungsebenen. To generate a predetermined light distribution, such as a city light, country road, highway light, low beam or high beam distribution, the first panel element 2 and / or the second aperture element 3 and / or the third panel element 13 through the respective associated piezo control elements 6 in the adjustment direction 7 adjusted in the appropriate operating position that the optically effective Blendkantenkontur by a blend edge 4 . 5 . 14 the aperture elements 2 . 3 . 13 or by at least two Blendkantenabschnitte the Blendkanten 4 . 5 . 14 is formed. In the operating positions of the aperture device 10 overlap the aperture elements 2 . 3 . 13 ,

According to a further embodiment of the invention according to 3 is an aperture device 15 provided in which the first panel element 2 is designed as a driver-diaphragm element, the same at vertical adjustment of the adjustment a the third diaphragm element 13 detected and spends the same mechanical coupling of a further adjustment b in a common operating position, in the Blendkantenabschnitte 2 ' of the first panel element 2 and a bezel section 14 ' of the third panel element 14 form the predetermined Blendkantenkontur. For this purpose, the first panel element 2 an unillustrated driver element, which in the height position 16 of the first panel element 2 on an extension, not shown, of the third diaphragm element 13 comes to the plant. In this embodiment of the diaphragm device 15 is the third aperture element 13 no piezo actuator 6 or a piezo actuator 6 assigned in an idle position.

According to another embodiment of a diaphragm device 17 according to 4 is only a first aperture element 2 and a third aperture element 13 provided, each by means of a piezo-actuator 6 are arranged adjustable in the vertical direction. This aperture device 17 generates a plurality of light distributions, such as high beam, city light, etc., where the low beam distribution is limited to right-hand traffic. By vertical adjustment of the aperture element 2 and / or the diaphragm element 13 Different light distributions can be generated. For example, the aperture elements 2 . 13 as a function of a sensor unit (camera) accommodating the current road space, so that the greatest possible illumination of the road space can take place with the exception of the road space area in which a preceding and / or oncoming road user is located.

In addition, the aperture elements can 2 . 13 be synchronously adjustable by means of a control unit, not shown, that regardless of the current pitch angle position of the vehicle, a predetermined same light distribution is generated. Thus, a headlight range control can be done in a simple manner, with adjustment of the diaphragm elements 2 . 13 downwards an increased proportion of light is spent in the street space.

Of course, those apply to the aperture device 17 described control measures for the other described aperture devices 1 . 10 . 15 , In particular, the Blen denelemente 2 . 3 . 13 the diaphragm devices can be controlled such that a calibration of the diaphragm device can be made to the sensor unit.

According to another embodiment of a diaphragm device 18 according to 5 can unlike the aperture device 17 the first panel element 2 also around a horizontal axis of rotation running parallel to the optical axis 19 be arranged pivotably. In the present embodiment, this is the first diaphragm element 2 assigned piezo actuator 6 around a pivot axis 20 rotatably mounted. The pivot axis 20 is parallel to the axis of rotation 19 arranged.

1

aperture means

2, 2 '

first diaphragm element

3

second diaphragm element

4

blend edge

5

blend edge

6

Piezo actuator

7

adjustment

8th

Longitudinal center plane

10

aperture means

13

third diaphragm element

14.14 '

blend edge

15

aperture means

16

height position

17

aperture means

18

aperture means

19

axis of rotation

20

swivel axis

a

adjustment

b

adjustment

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 19537838 A1 [0002]
• - DE 19908641 A1 [0003]
• - DE 10305624 A1 [0004]

Claims (11)

Projection headlight for vehicles with a reflector, with a reflector associated with the light source, with a reflector in the light emission direction lens, with a arranged between the light source and the lens aperture device, by means of which different light distributions associated Blendkantenkonturen are adjustable, characterized in that the aperture device ( 1 . 10 . 15 . 17 . 18 ) at least one at least the predetermined Blendkantenkontur partially forming diaphragm element ( 2 . 3 . 13 ), which by means of a piezoelectric actuator ( 6 ) in an extension plane of the diaphragm device ( 1 . 10 . 15 . 17 . 18 ) is arranged adjustable in at least one operating position. Projection headlight according to claim 1, characterized in that at least two diaphragm elements ( 2 . 3 . 13 ) are arranged offset parallel to one another in the light emission direction and the same by means of the respective associated piezo control elements ( 6 ) can be brought into an overlapping operating position, in which the predetermined glare edge contour by at least two Blendkantenabschnitte ( 2 ' . 14 ' ) of the at least two diaphragm elements ( 2 . 3 . 13 ) is formed. Projection headlight according to claim 1 or 2, characterized in that at least two diaphragm elements ( 2 . 3 ) each complementary to each other arranged Blendkanten ( 4 . 5 ), in such a way that in an initial operating position thereof an asymmetrical low-beam distribution for right-hand traffic and in a second operating position thereof an asymmetrical low-beam distribution for left-hand traffic is formed. Projection headlight according to one of claims 1 to 3, characterized in that the aperture elements ( 2 . 3 . 13 ) associated piezo actuators ( 6 ) in a region of the respective aperture elements ( 2 . 3 . 13 ), in which the diaphragm elements ( 2 . 3 . 13 ) have the largest transverse extent. Projection headlight according to one of claims 1 to 4, characterized in that a third aperture element ( 13 ) with a particular horizontal blend edge ( 14 ) is provided, such that by overlapping the third diaphragm element ( 13 ) with the two further diaphragm elements ( 2 . 3 ) a city light distribution or a highway light distribution or a motorway light distribution is generated. Projection headlight according to one of claims 1 to 5, characterized in that at least one aperture element ( 2 ) is designed as a driver-diaphragm element, such that when it is adjusted in an adjustment direction ( 7 ) another aperture element ( 13 ) moved into a common operating position, in the at least Blendkantenabschnitte ( 2 ' . 14 ' ) of the same reflect a given light distribution. Projection headlight according to one of claims 1 to 6, characterized in that the diaphragm elements ( 2 . 3 . 13 ) are each adjustable in the vertical direction or mounted pivotable about a horizontal axis extending parallel to the optical axis. Projection headlight according to one of claims 1 to 7, characterized in that the diaphragm elements ( 2 . 3 . 13 ) in a vertical direction ( 7 ) are synchronously adjustable, that regardless of the current pitch angle position of the vehicle, a predetermined same light distribution is generated. Projection headlight according to one of claims 1 to 8, characterized in that at least one aperture element ( 2 . 3 . 13 ) in dependence on a current street receiving sensor unit is controllable, such that the illumination of an oncoming and / or preceding road users containing road space area is recessed. Projection headlight according to one of claims 1 to 9, characterized in that the diaphragm elements ( 2 . 3 . 13 ) are controllable such that a calibration of the diaphragm device ( 1 . 10 . 15 . 17 . 18 ) takes place to the sensor unit. Projection headlight according to one of claims 1 to 10, characterized in that the aperture elements ( 2 . 3 . 13 ) are formed as Blendflächenelemente, each extending in a strip-shaped transverse to the optical axis.