LIGHTING DEVICE FOR CAR HEADLIGHTS

Description

[0001] The invention relates to a lighting device for a motor vehicle headlight for generating a segmented high beam distribution, wherein the high beam distribution has a first and a second illuminance maximum, which are designed and arranged in the high beam distribution such that an intersection point HV of the horizontal line HH and the vertical line VV of a measuring screen for measuring a light distribution within an isolux line is arranged for 80% of the maximum illuminance of the high beam distribution, wherein the lighting device for this purpose comprises the following: An optical body comprising a base body and several light guides projecting from the base body for forming the definable segmented high-beam distribution from the light of light sources, each light guide having a light entry surface into which light from the light sources can be injected, and an exit surface from which light injected into the respective light guides exits, wherein the exit surfaces of adjacent light guides are directly adjacent to each other and form a common exit surface of the optical body, wherein the light guides of the optical body are arranged in at least one row along a straight line, several light sources, wherein at least one light source is assigned to each entry surface of a light guide, a projection optic downstream of the beam path of the optical body with an optical axis, which projection optic is configuredthat light emerging from the common exit surface is imaged in front of the lighting device in the direction of a main emission direction, wherein the optical axis of the projection optics intersects the intersection point HV, and wherein the optical axis is parallel to the main emission direction of the lighting device, . wherein a first and second virtual axis are arranged orthogonally to the main emission direction, wherein the first and second virtual axis are also aligned orthogonally to each other, wherein in a properly installed state of the lighting device in a motor vehicle headlight the first axis is arranged in a horizontal plane and the second axis in a vertical plane, and wherein each light guide element, viewed in a properly installed state of the lighting device in a motor vehicle, has two lateral side surfaces as well as an upper and a lower side surface, which side surfaces extend from the entry surface towards the common exit surface and at least partially delimit the light guide element, and wherein the optical body has a first and a second light emission half,which, when viewed in a properly installed state of the lighting device in a motor vehicle, can be distinguished from one another by a virtual vertical plane passing through the optical body and in which vertical plane the optical axis of the projection optics is located, wherein the first half of the light emission is arranged on a first side of the virtual vertical plane.

[0002] The invention further relates to a motor vehicle headlight with at least one lighting device according to the invention.

[0003] Due to a legal ECE regulation, the light distribution must ensure that the intersection point HV is located within an isolux line for 80% of the maximum illuminance of the high beam distribution.

[0004] This limits the design possibilities of lighting devices or vehicle headlights, especially in the case of segmented high beam distributions, leading to massive limitations.

[0005] US 2021 / 180760 A1, CN 209688723 U and US 2020 / 103086 A1 disclose known lighting devices for automotive headlights.

[0006] One object of the invention is to provide an improved lighting device.

[0007] This task is solved by the fact that the first light guide body of the first light emission half, which is immediately adjacent to the virtual vertical plane, contributes to the generation of the first illuminance maximum of the high beam distribution, and wherein the first light guide body of the second light emission half, which is immediately adjacent to the virtual vertical plane, contributes to the generation of the second illuminance maximum of the high beam distribution, wherein the entrance surfaces of these first light guide bodies each have an offset to the corresponding exit surface, such that the surface center of the entrance surface has a horizontal offset directed away from the virtual vertical plane along the first axis, which runs orthogonally to the virtual vertical plane, and a downward vertical offset along the second axis to the surface center of the associated exit surface, and wherein the lateral side surface of these first light guide bodies,which is convex and, in combination with the offset of the entrance surfaces, is designed to direct light from the corresponding light source towards the optical axis in order to increase the illuminance between the first and second illuminance maximums in the far beam distribution, such that the intersection point HV of a measuring screen is located within the isolux line for 80% of the maximum illuminance of the far beam distribution.

[0008] It may be provided that the lateral side surface of these first light guide bodies, which is directed towards the virtual vertical plane, is concave.

[0009] It may be provided that the upper side surface of these first light guide elements is curved, preferably concave.

[0010] It can be provided that the lower side surface of these first light guide bodies is curved, preferably convex.

[0011] It may be provided that the entry surfaces of the light guide bodies are arranged in a common vertical plane, which vertical plane is arranged orthogonally to the main emission direction.

[0012] It may be provided that the multiple light sources are designed as light-emitting diodes.

[0013] It can be provided that the light-emitting diodes can be controlled independently of each other, preferably switched on and off independently of each other, and in particular dimmed independently of each other.

[0014] It can be provided that the light guide elements of the optical body are arranged in exactly one row along a straight line, wherein preferably the straight line is orthogonal to the optical axis of the projection optics. The problem is also solved by a motor vehicle headlight with at least one lighting device according to the invention.

[0015] The invention is explained in more detail below with reference to exemplary drawings. These show Fig. 1 a top view of an exemplary lighting device comprising an optical body with several light guides into which light from light sources can be fed, and a projection optic downstream of the optical body for generating a segmented high beam distribution, Fig. 2 a rear view of the exemplary lighting device Fig. 1 , Fig. 3a representation of a schematic offset of the light entry and light exit surfaces of a light guide body, and Fig. 4 an exemplary one, from the lighting device Fig. 1 Generable, segmented high beam distribution with two illuminance maxima.

[0016] Fig. 1 shows an example lighting device 10 for a

[0017] Motor vehicle headlights for generating a segmented high beam distribution FL, where the high beam distribution FL a first and a second illuminance maximum M1, M2 exhibits which are designed in this way and in the high beam distribution FL are arranged so that an intersection point HV the horizontal line HH and the vertical line VV of a measuring screen for measuring a light distribution within an isolux line for 80% of the maximum illuminance of the high beam distribution FLis arranged, which light distribution FL in Fig. 4 is shown.

[0018] This requirement refers to the legal ECE regulation, for example as set out in the Official Journal of the European Union L 250 / 82.

[0019] In general, isolux lines indicate the distribution of the corresponding illuminance on a visible surface, with points of equal illuminance being connected by curves, namely the isolux lines.

[0020] In the example shown, the lighting device includes 10 multiple light sources 50 and an optical body 100, encompassing a basic body 110 and several of the basic body 110 Prominent light guides 200 for shaping the definable segmented high beam distribution FL from the light of the light sources 50, which optical fibers 200 each has a light entry surface 210show into which light from the light sources 50 It can be fed in, and has an outlet area. 220 indicate from which exit surface 220 in the respective light guides 200 light that can be supplied is emitted, wherein the emission surface 220 adjacent optical fiber 200 directly adjacent to each other and sharing a common exit area 220a of the optical body 100 form, whereby the light guides 200 of the optical body 100 in exactly one row along a straight line G are arranged, which line G orthogonal to the optical axis A the projection optics.

[0021] This involves a light source 50 each an entrance area 210 a light guide 200 assigned. The multiple light sources 50are designed as light-emitting diodes, wherein the light-emitting diodes can be controlled independently of each other, preferably can be switched on and off independently of each other, and in particular can be dimmed independently of each other.

[0022] Furthermore, the entrance areas 210 the light guide 200 in a common vertical plane (seen in a properly installed state of the lighting device) 10 (in a motor vehicle) arranged which vertical plane is orthogonal to the main direction of radiation X is arranged.

[0023] Furthermore, the lighting device includes 10 one of the beam paths of the optical body 100 downstream projection optics 300, which may, for example, include one or more projection lenses, with an optical axis A, Which projection optics 300 It is set up so that from the common exit area 200aLight escaping in front of the lighting device 10 in the direction of a main radiation direction X to depict, whereby the optical axis A the projection optics 300 the intersection HV intersects, and where the optical axis A parallel to the main radiation direction X the lighting device 10 is.

[0024] Furthermore, regarding the main radiation direction X a first and second virtual axis y, z orthogonally arranged, with the first and second virtual axes y, z are also orthogonally aligned with each other, in a properly installed state of the lighting device 10 in a motor vehicle headlight the first axis y in a horizontal plane and the second axis y are arranged in a vertical plane.

[0025] Furthermore, each light guide element 200seen in a properly installed state of the lighting device 10 in a motor vehicle two lateral side surfaces 230a, 230b as well as an upper and a lower side surface 240a, 240b on which side surfaces 230a, 230b, 240a, 240b from the entrance area 210 towards the common exit area 220a extend and the light guide 200 at least limit it in sections.

[0026] As in Fig. 1 and Fig. 2 As shown, the optical body 100 a first and a second half of the light emission L1, L2 on, which is seen in a properly installed state of the lighting device 10 in a motor vehicle by a virtual vertical plane VE, which passes through the axis of the main radiation direction X and the second axis z is determined and through the optical body 100 runs and in which vertical plane VE the optical axis Athe projection optics 300 The areas are located and can be distinguished from one another.

[0027] Here, each half of the light emission exhibits L1, L2 the same number of light guides 200 on.

[0028] The first half of the light emission L1 is on the first page S1 the virtual vertical plane VE is arranged, and wherein the second half of the light emission L2 on one of the first pages S1 opposite second side S2 is arranged.

[0029] The first optical fiber 200a the first half of the light emission L1, which is immediately adjacent to the virtual vertical plane VE is, acts during the generation of the first illuminance maximum. M1 the high beam distribution FL with, wherein the first optical element 200b the second half of the light emission L2,which is immediately adjacent to the virtual vertical plane VE is, during the generation of the second illuminance maximum M2 the high beam distribution FL participates.

[0030] The entrance areas 210 these first optical fibers 200a, 200b Each exhibits an offset, in particular a parallel offset, to the corresponding exit surface. 220 so that the center of the area FM2 the entrance area 210 one of the virtual vertical plane VE away-directed horizontal offset H-off along the first axis y, which is orthogonal to the virtual vertical plane VE runs, and has a downward vertical offset V-off along the second axis z to the center of the area FM1 the associated exit area 220 exhibits this. This is particularly evident in Fig. 3 clearly illustrated.

[0031] The lateral side surface 230a these first optical fibers 200a, 200b, which of the virtual vertical plane VE The side facing away is convex and in combination with the offset of the entry surfaces 210 set up, light from the corresponding light source 50, to direct the light in the direction of the optical axis A in order to adjust the illuminance between the first and second illuminance maximums. M1, M2 in the high beam distribution FL to increase so that the intersection HV a measuring screen within the isolux line for 80% of the maximum illuminance of the high beam distribution FL is arranged.

[0032] Furthermore, that lateral side surface 230b these first optical fibers 200a, 200b, which to the virtual vertical plane VE It is directed and concave. Furthermore, the upper side surface is 240a these first optical fibers 200a, 200bCurved, preferably concave. The lower side surface 240b these first optical fibers 200a, 200b It is curved, preferably convex.

[0033] This increases the illuminance between the illuminance maxima. M1, M2 further intensified. LIST OF REFERENCE MARKS

[0034] Lighting device... 10 Light source... 50 Optical body... 100 Basic body ... 110 Optical fibers... 200 First optical fiber... 200a, 200b Light entry area... 210 Light emission surface... 220 Common light emission surface... 220a Lateral surfaces... 230a, 230b Upper side surface... 240a Lower side surface... 240b Projection optics... 300 Main radiation direction... X Optical axis... A Straight... G High beam distribution... FL First half of light emission... L1 Second half of light emission... L2 First maximum illuminance... M1 Second maximum illuminance... M2 First page... S1 Second page... S2 Virtual vertical plane... VE Horizontal offset... H-off Vertical offset... V-off

Claims

1. Lighting device (10) for a motor vehicle headlamp for producing a segmented high beam distribution (FL), the high beam distribution (FL) having a first and a second maximum illuminance (M1, M2), which are designed and arranged in the high beam distribution (FL) in such a way that an intersection HV of the horizontal line H-H and the vertical line V-V of a measuring screen for measuring a light distribution is arranged within an isolux line for 80% of the maximum illuminance of the high beam distribution (FL), wherein the lighting device (10) comprises the following for this purpose: - an optical body (100), comprising a base body (110) and a plurality of light guiding bodies (200) projecting from the base body (110) for forming the determinable segmented high beam distribution (FL) from the light of light sources (50), which light guiding bodies (200) each have a light entry surface (210) into which light from the light sources (50) can be fed, and an exit surface (220), from which exit surface (220) light which can be fed into the respective light guide bodies (200) emerges, wherein the exit surface (220) of neighbouring light guide bodies (200) directly adjoin one another and form a common exit surface (220a) of the optical body (100), wherein the light guide bodies (200) of the optical body (100) are arranged in at least one row along a straight line (G), - a plurality of light sources (50), wherein at least one light source (50) is associated with a respective light entry surface (210) of an optical fibre body (200), - a projection optical system (300) arranged downstream of the beam path of the optical body (100) and having an optical axis (A), which projection optical system (300) is configured to image the light emerging from the common exit surface (200a) in front of the illumination device (10) in the direction of a main emission direction (X), the optical axis (A) of the projection optical system (300) intersecting the intersection point HV, and the optical axis (A) being parallel to the main emission direction (X) of the illumination device (10), wherein a first and second virtual axis (y, z) are arranged orthogonally to the main radiation direction (X), wherein the first and second virtual axes (y, z) are also aligned orthogonally to one another, wherein in a properly installed state of the lighting device (10) in a motor vehicle headlamp the first axis (y) is arranged in a horizontal plane and the second axis (y) is arranged in a vertical plane, and wherein each light guide body (200), as seen in a properly installed state of the lighting device (10) in a motor vehicle, has two lateral side surfaces (230a, 230b) and an upper and a lower side surface (240a, 240b), which side surfaces (230a, 230b, 240a, 240b) extend from the entry surface (210) in the direction of the common exit surface (220a) and delimit the light guide body (200) at least in sections, wherein the optical body (100) has a first and a second light-emitting half (L1, L2) which, viewed in a properly installed state of the lighting device (10) in a motor vehicle, can be delimited from one another by a virtual vertical plane (VE) which runs through the optical body (100) and in which vertical plane (VE) the optical axis (A) of the projection optics (300) is located, can be delimited from one another, wherein the first light emission half (L1) is arranged on a first side (S1) of the virtual vertical plane (VE), and wherein the second light emission half (L2) is arranged on a second side (S2) opposite the first side (S1), characterised in that the first light guide body (200a) of the first light emission half (L1), which is directly adjacent to the virtual vertical plane (VE), participates in the generation of the first illuminance maximum (M1) of the main beam distribution (FL), and wherein the first light guide body (200b) of the second light emission half (L2), which is directly adjacent to the virtual vertical plane (VE), cooperates in the generation of the second illuminance maximum (M2) of the high beam distribution (FL), the entry surfaces (210) of these first light guide bodies (200a, 200b) each having an offset from the corresponding exit surface (220), so that the center of area (FM2) of the light entry surface (210) has a horizontal offset (H-off) along the first axis (y) directed away from the virtual vertical plane (VE), which is orthogonal to the virtual vertical plane (VE), and a downwardly directed vertical offset (V-off) along the second axis (z) to the center of the surface (FM1) of the associated exit surface (220), and wherein the lateral side surface (230a) of these first light guide bodies (200a, 200b), which faces away from the virtual vertical plane (VE), is convex and, in combination with the offset of the entry surfaces (210), is set up to direct light from the corresponding light source (50) in the direction of the optical axis (A), in order to increase the illuminance between the first and the second illuminance maximum (M1, M2) in the main beam distribution (FL), so that the intersection HV of a measuring screen is arranged within the isolux line for 80% of the maximum illuminance of the main beam distribution (FL).

2. Lighting device according to claim 1, characterized in that that lateral side surface (230b) of these first light guide bodies (200a, 200b) which is directed towards the virtual vertical plane (VE) is concave.

3. Lighting device according to claim 1 or 2, characterized in that the upper lateral surface (240a) of these first light guide bodies (200a, 200b) is curved, preferably concave.

4. Lighting device according to one of claims 1 to 3, characterized in that the lower side surface (240b) of these first light guide bodies (200a, 200b) is curved, preferably convex.

5. Lighting device according to one of claims 1 to 4, characterized in that the entrance surfaces (210) of the light guide bodies (200) are arranged in a common vertical plane, which vertical plane is arranged orthogonally to the main radiation direction (X).

6. Lighting device according to one of claims 1 to 5, characterized in that the plurality of light sources (50) are designed as light-emitting diodes.

7. Lighting device according to claim 6, characterized in that the light-emitting diodes can be controlled independently of one another, preferably can be switched on and off independently of one another, in particular can be dimmed independently of one another.

8. Lighting device according to one of claims 1 to 7, characterized in that the light guide bodies (200) of the optical body (100) are arranged in exactly one row along a straight line (G).

9. Motor vehicle headlamp with at least one lighting device according to one of claims 1 to 8.