Lighting equipment for motor vehicle headlights

Abstract

A lighting device for generating a low beam headlight distribution for a motor vehicle headlight, comprising: at least one light source; an optical body including: a common light input section that couples light from at least one light source into the optical body and has at least one light-collecting element, the at least one light-collecting element being assigned to a corresponding light source; and a light output section that decouples light coupled into the optical body from the optical body in the main direction of the lighting device; and a projection lens system configured to project light in front of the lighting device, wherein the at least one light-collecting element, combined with the optical body, allows at least three sets of light paths, forming a low beam headlight distribution by a first portion of the low beam headlight distribution facilitated by light following a first and second light paths and a second portion of the low beam headlight distribution facilitated by light following a third light path, wherein the vertical extension of the low beam headlight distribution extends downward along a V-V line from at least 0° to at least -10°.

Description

Technical Field

[0001] This invention relates to a lighting device for generating a low beam light distribution for a motor vehicle headlight, wherein the vertical extension range of the low beam light distribution extends downward along the VV line from at least 0° to at least -10°, the lighting device comprising:

[0002] -Constructed to emit at least one light source,

[0003] -Optical body, which includes:

[0004] - A common light input section for coupling light from at least one light source into the optical body, the common light input section having at least one light-collecting element assigned to a corresponding light source and configured to couple light from the assigned light source into the optical body.

[0005] - The light output section is used to decouple light rays coupled into the optical body via the common light input section from the optical body in the main direction of the lighting device.

[0006] - A shell surface defining the optical body, said shell surface being configured to deflect light coupled into the optical body, the shell surface extending between a common light input section and a light output section.

[0007] - A projection lens system comprising at least one lens, arranged downstream of the optical body along the main direction to receive light emitted from the light output section of the optical body, wherein the projection lens system is configured to project light in front of the illumination device.

[0008] The projection lens system is combined with at least one light source and optical element to generate a low beam light distribution illuminated by the projection lens system.

[0009] Furthermore, the present invention relates to a motor vehicle headlight comprising at least one lighting device according to the present invention. Background Technology

[0010] In some cases, particularly when high-resolution high beam and / or high-resolution low beam distribution is required for vehicle headlights, the construction of the corresponding lighting equipment requires certain conditions that sometimes prevent compliance with legal requirements regarding low beam distribution (see, for example, the Official Journal of EU L 250 / 92 - 22.08.2014).

[0011] Considering the illumination intensity and the spatial lighting required on the road, enhanced lighting equipment is needed in order to also meet the requirements for low beam headlight distribution. Summary of the Invention

[0012] The objective of this invention is to provide an enhanced lighting device.

[0013] To achieve this goal, at least one light-collecting element, combined with an optical body, allows for at least three light paths.

[0014] The optical body includes a first set of optical operating surfaces for guiding at least a portion of light rays coupled into the optical body via a common light input section from the common light input section to the light output section along a first light path.

[0015] The first set of optical operating surfaces includes a first deflection surface and a light emitting surface, wherein the first deflection surface is part of the shell surface, and the light emitting surface is part of the light output section.

[0016] In this process, light rays following the first ray path are incident on the first deflection surface and deflected to the light-emitting surface for decoupling from the optical body.

[0017] Furthermore, the light rays following the second ray path directly enter the light exit surface from the common light input section.

[0018] Among them, the light rays following the first and second light paths contribute to the first part of the low beam light distribution.

[0019] Furthermore, the optical body includes a second set of optical operating surfaces for guiding at least a portion of the light rays coupled into the optical body via the common light input section to the light output section along a third light path.

[0020] The second set of optical operating surfaces includes a second deflection surface and a light emitting surface. The second deflection surface is part of the shell surface and separate from the first deflection surface. Furthermore, the second deflection surface, in the correct installation state of the lighting equipment in the vehicle, is the top surface of the optical body and is formed as a concave surface.

[0021] In this process, the light rays following the third ray path are incident on the second deflection surface and deflected to the light-emitting surface for decoupling from the optical body.

[0022] Furthermore, the light rays following the third ray path contribute to the second part of the low beam light distribution.

[0023] The low beam distribution is formed by a first portion of the low beam distribution facilitated by light rays following a first light path and a second light path, and by a second portion of the low beam distribution facilitated by light rays following a third light path, wherein the vertical extension of the low beam distribution extends along the VV line from at least 0° downwards to at least -10° on the VV line.

[0024] Advantageously, the lighting device includes at least two light sources, wherein the common light input section includes at least two light-collecting elements, each of which is assigned to a light source.

[0025] Advantageously, the light sources are arranged in at least one row along a horizontal line, wherein the corresponding light-collecting elements are arranged in a row along a horizontal line, wherein the horizontal line is substantially orthogonal to the main direction.

[0026] Advantageously, at least one light source is constructed as an LED.

[0027] Advantageously, at least one light-collecting element is constructed as a TIR lens.

[0028] Advantageously, the light emitting surface and the shell surface intersect along a common surface segment line, which forms an asymmetric cutoff boundary for the near-beam light distribution.

[0029] Advantageously, the projection lens system includes an optical axis and the light-emitting surface has a surface vector that is tilted relative to the optical axis of the projection lens system.

[0030] Advantageously, the projection lens system includes a curved focal surface, preferably a Petzvar surface, wherein the light emitting surface is inclined relative to the curved focal surface, such that only common surface segments are arranged in the curved focal surface.

[0031] Advantageously, the surface vector of the light-emitting surface is tilted upwards when viewed in the correct installation state of the lighting equipment in the vehicle.

[0032] Advantageously, at least one light-collecting element has a curved light input surface for coupling light from a distributed light source into the optical body, wherein the curved light input surface includes a central segment having a convex shape.

[0033] Advantageously, the curved light input surface of at least one light-collecting element includes a first deflection segment corresponding to the second deflection surface, wherein the deflection segment is configured to deflect light incident on the first deflection segment to the second deflection surface.

[0034] Advantageously, the first deflection section has a curve that is opposite to the curve of the central section of the light input surface, preferably a concave curve.

[0035] Advantageously, at least one light-collecting element includes a second deflection segment corresponding to the first deflection surface, wherein the second deflection segment is configured to deflect light incident on the second deflection segment to the first deflection surface, wherein when incident on the second deflection segment, the light follows a fourth light path, and wherein the fourth light path contributes to the distribution of the low beam light.

[0036] Advantageously, at least one light source emits light in the light emission direction, wherein at least one light source is arranged in such a way that the light emission direction is not parallel to the main direction of the lighting device.

[0037] The term "light emission direction" should be understood as the direction along which at least one light source emits the most or strongest light due to its directionality, or in other words, the direction in which the highest luminous flux exists.

[0038] The objective of the present invention is also achieved by a motor vehicle headlight that includes at least one lighting device according to the present invention.

[0039] The objective can also be achieved by a motor vehicle headlight that includes at least one lighting device according to the invention. Attached Figure Description

[0040] In the following description, illustrative and non-limiting embodiments are discussed to further illustrate the invention, as shown in the accompanying drawings, which illustrate:

[0041] Figure 1 This is an isometric view of an example lighting device, which includes a light source, an optical body therein from which light rays from the light source can be coupled, and a projection lens configured to project decoupled light rays from the optical body in front of the lighting device.

[0042] Figure 2 It is in the cross-sectional view Figure 1 The optical body of the lighting device, which includes a light input section and a light output section.

[0043] Figure 3A yes Figure 1 A detailed view of an example of the light input section of a lighting device.

[0044] Figure 3B yes Figure 1 Detailed view of another example of the light input section of a lighting device.

[0045] Figure 4 It is by Figure 1 An example of the distribution of low beam light produced by lighting equipment.

[0046] Figure 5 yes Figure 1 A front view of the light output section of the optical body of the lighting device, and

[0047] Figure 6 yes Figure 1 Rear view of the light input section of the lighting equipment. Detailed Implementation

[0048] Figure 1An example of a lighting device 10 for a motor vehicle headlight is shown, wherein the vertical extension of the low beam light distribution extends along the VV line from at least 0° downwards to at least -10° on the VV line. Figure 4 You can see more details in the middle.

[0049] The lighting device 10 includes a light source 50 configured to emit light and an optical body 100, the optical body 100 including a common light input section 110 for coupling light from the light source 50 into the optical body 100, wherein the light source is configured as an LED.

[0050] The common light input section 110 has light-collecting elements 120, each of which is assigned to a corresponding light source 50 and configured to couple light from the assigned light source 50 into the optical body 100.

[0051] In addition, the optical body 100 includes a light output section 130 for decoupling light rays coupled into the optical body 100 via the common light input section 110 from the optical body 100 in the main direction X of the lighting device 10.

[0052] The light sources 50 are arranged in rows along a horizontal straight line, and the corresponding light-collecting elements 120 are also arranged in rows along a horizontal straight line, where the horizontal straight line is substantially orthogonal to the main direction X. For example, this could be achieved in... Figure 6 It was seen in the middle, Figure 6 A rear view of the optical body 100 is shown.

[0053] The optical body 100 also includes a shell surface 140 that defines the optical body 100 by extending between a common light input section 110 and a light output section 130. The shell surface 140 is configured to deflect light coupled into the optical body 100, preferably by total internal reflection.

[0054] The lighting device 10 also includes a projection lens system 200 comprising at least one lens (exactly one lens in the example shown) arranged downstream of the optical body 100 along the main direction X to receive light emitted from the light output section 130 of the optical body 100, wherein the projection lens system 200 is configured to project light in front of the lighting device 10, and wherein the projection lens system 200, together with the light source 50 and the optical body 100, is configured to produce a low beam light distribution LB illuminated by the projection lens system 200.

[0055] If available Figure 2As seen in the image, the light-collecting element 120, combined with the optical body 100, allows four sets of light paths LR1, LR2, LR3, and LR4. The optical body 100 includes a first set of optical operating surfaces for guiding at least a portion of the light coupled into the optical body 100 via the common light input section 110 to the light output section 130 along the first light path LR1.

[0056] The first set of optical operating surfaces includes a first deflection surface 310 and a light emitting surface 300, wherein the first deflection surface 310 is a portion of the shell surface 140, and the light emitting surface 300 is a portion of the light output section 130.

[0057] Light following the first ray path LR1 is incident on the first deflection surface 310 and deflected to the light exit surface 300 for decoupling from the optical body 100. Light following the second ray path LR2 is directly incident on the light exit surface 300 from the common light input section 110. Lights following the first ray path LR1, the second ray path LR2, and the fourth ray path LR4 contribute to the formation of a first portion of the low beam light distribution, which, LB1, can... Figure 4 It was seen in the middle.

[0058] The optical body 100 includes a second set of optical operating surfaces for guiding at least a portion of light coupled into the optical body 100 via a common light input section 110 to a light output section 130 along a third light path LR3.

[0059] The second set of optical operating surfaces includes a second deflection surface 320 and a light emitting surface 300, wherein the second deflection surface 320 is part of the shell surface 140 and separate from the first deflection surface 310, and wherein the second deflection surface 320 is the top surface of the optical body 100 and is formed as a concave surface in the correct installation state of the lighting device 10 in the vehicle.

[0060] Light rays following the third ray path LR3 are incident on the second deflection surface 320 and deflected to the light exit surface 300 for decoupling from the optical body 100, and wherein the light rays following the third ray path LR3 contribute to the second portion LB2 that generates the near beam light distribution, which can also be used in... Figure 4 It was seen in the middle.

[0061] A low beam distribution is formed by a first portion of the low beam distribution facilitated by light rays following a first light path LR1 and a second light path LR2, and a second portion of the low beam distribution facilitated by light rays following a third light path LR3. The vertical extension of the low beam distribution extends along the VV line from at least 0° downwards to at least -10° on the VV line. Figure 4 It was seen in the middle.

[0062] Furthermore, the light-collecting element 120 has a curved light input surface for coupling light from the distributed light source 50 into the optical body 100, wherein the curved light input surface includes a central segment 122 having a convex shape, which can... Figure 3A China and Figure 3B As seen in the figures, two of them illustrate different embodiments of the lighting device 10 or the optical body 100.

[0063] exist Figure 3B The curved light input surface of the light-collecting element 120 shown includes a first deflection segment 121 corresponding to the second deflection surface 320 of the optical body 100, wherein the deflection segment 121 is configured to deflect light incident on the first deflection segment 121 to the second deflection surface 320, wherein when incident on the deflection segment 121, the light follows a third light path LR3, and wherein the third light path LR3 contributes to the distribution of the low beam light.

[0064] The first deflection section 121 has a curved portion opposite to the curved portion of the central section 122 of the light input surface, preferably a concave curved portion.

[0065] exist Figure 3B China and still Figure 2 The light-collecting element 120 in the embodiment shown includes a second deflection segment 123 corresponding to a first deflection surface 310 of the optical body 100, wherein the second deflection segment 123 is configured to deflect light incident on the second deflection segment 123 to the first deflection surface 310, wherein when incident on the second deflection segment 123, the light follows a fourth light path LR4, and wherein the fourth light path LR4 contributes to a first portion LB1 of the low beam light distribution.

[0066] Furthermore, the light source 50 emits light rays in the light emission direction X1, wherein... Figure 2 and Figure 3B In the embodiments shown, at least one light source 50 is arranged such that the light emission direction X1 is not parallel to the main direction X of the lighting device 10. Conversely, in... Figure 3A In the embodiment shown, the light emission direction X1 is parallel to the principal direction X, wherein in Figure 3A The light-collecting element 120 shown is constructed as a TIR lens, wherein in Figure 3B The light-collecting element 120 shown can be regarded as an improved TIR lens.

[0067] Back Figure 2The light-emitting surface 300 of the optical body 100 and the shell surface 140 intersect along a common surface segment line 150, which forms an asymmetric cutoff boundary for the near-beam light distribution. The common surface segment line 150 can... Figure 5 It was seen in the middle, Figure 5 The previous view shows the optical body 100. As can be clearly seen, the common surface segment line 150 is configured to create an asymmetric cutoff boundary in the low beam light distribution.

[0068] Furthermore, the projection lens system 200 includes an optical axis A and a light emitting surface 300 has a virtual surface vector V, which is tilted relative to the optical axis A of the projection lens system 200, wherein the surface vector V of the light emitting surface 300 is viewed when the lighting device 10 in the vehicle is correctly installed and, as in Figure 2 As shown in the diagram, it is tilted upwards, so that the light emitting surface 300 faces upwards.

[0069] Furthermore, the projection lens system 200 includes a curved focal surface F, preferably a Petzvar surface, wherein the light emitting surface 300 is inclined relative to the curved focal surface F, such that only the common surface segment line 150 is arranged in the curved focal surface F.

[0070] List of reference numerals

[0071] 10. Lighting equipment…

[0072] 50 light sources…

[0073] 100 Optical components…

[0074] 110 Public Optical Input Section…

[0075] 120 Light collecting element…

[0076] 121 First deflection section…

[0077] 122 Central Section…

[0078] 123 Second deflection section…

[0079] 130 Optical Output Section…

[0080] 140 Shell surface…

[0081] 150 Public Surface Section Line…

[0082] 200 Projection Lens System…

[0083] 300 Light exit surface…

[0084] 310 First deflection surface…

[0085] 320 Second deflection surface…

[0086] A optical axis…

[0087] F - Curved focal surface...

[0088] LB light distribution…

[0089] The first part of the LB1 light distribution…

[0090] The second part of the LB2 light distribution…

[0091] The light paths grouped together: LR1, LR2, LR3, LR4…

[0092] V surface vector…

[0093] X Main Direction…

[0094] X1 Light emission direction...

Claims

1. A lighting device (10) for generating low beam light distribution (LB) for motor vehicle headlights, wherein, The vertical extension of the low beam distribution (LB) extends along the VV line from at least 0° downwards to at least -10°, and the lighting device (10) comprises: -Constructed to emit at least one light source (50), -Optical body (100), comprising: - A common light input section (110) for coupling light from the at least one light source (50) into the optical body (100), the common light input section (110) having at least one light collecting element (120) assigned to a corresponding light source (50) and configured to couple light from the assigned light source (50) into the optical body (100). - A light output section (130) for decoupling light rays coupled into the optical body (100) via the common light input section (110) from the optical body (100) in the main direction (X) of the lighting device (10). A shell surface (140) extending between the common light input section (110) and the light output section (130) defines the optical body (100), the shell surface (140) being configured to deflect light coupled into the optical body (100). - A projection lens system (200) including at least one lens, arranged downstream of the optical body (100) along the main direction (X) to receive light emitted from the light output section (130) of the optical body (100), wherein the projection lens system (200) is configured to project the light in front of the illumination device (10). The projection lens system (200), together with the at least one light source (50) and the optical body (100), is configured to produce the low beam light distribution (LB) illuminated by the projection lens system (200). Its features The at least one light-collecting element (120) combined with the optical body (100) allows for at least three light paths (LR1, LR2, LR3). The optical body (100) includes a first set of optical operating surfaces for guiding at least a portion of the light rays coupled into the optical body (100) via the common light input section (110) to the light output section (130) along a first light path (LR1). The first set of optical operating surfaces includes a first deflection surface (310) and a light emitting surface (300), wherein the first deflection surface (310) is a portion of the shell surface (140), and the light emitting surface (300) is a portion of the light output section (130). The light following the first ray path (LR1) is incident on the first deflection surface (310) and deflected to the light emitting surface (300) for decoupling from the optical body (100). Furthermore, the light following the second light path (LR2) directly enters the light emitting surface (300) from the common light input section (110). Specifically, the light rays following the first light path (LR1) and the second light path (LR2) contribute to the formation of the first portion (LB1) of the low beam light distribution. Furthermore, the optical body (100) includes a second set of optical operating surfaces for guiding at least a portion of the light rays coupled into the optical body (100) via the common light input section (110) to the light output section (130) along a third light path (LR3). The second set of optical operating surfaces includes a second deflecting surface (320) and the light emitting surface (300), wherein the second deflecting surface (320) is part of the shell surface (140) and separate from the first deflecting surface (310), and wherein the second deflecting surface (320) is the top surface of the optical body (100) and is formed as a concave surface in the correct installation state of the lighting device (10) in the vehicle. The light following the third ray path (LR3) is incident on the second deflection surface (320) and deflected to the light emitting surface (300) for decoupling from the optical body (100). Furthermore, the light rays following the third ray path (LR3) contribute to the formation of the second portion (LB2) of the low beam light distribution. The low beam distribution is formed by a first portion (LB1) of the low beam distribution facilitated by light rays following the first light path (LR1) and the second light path (LR2), and a second portion (LB2) of the low beam distribution facilitated by light rays following the third light path (LR3), wherein the vertical extension of the low beam distribution (LB) extends along the VV line from at least 0° downwards to at least -10°. The at least one light-collecting element (120) has a curved light input surface for coupling light from the allocated light source (50) into the optical body (100), wherein the curved light input surface includes a central segment (122) having a convex shape, wherein the curved light input surface of the at least one light-collecting element (120) includes a first deflection segment (121) corresponding to the second deflection surface (320), wherein the deflection segment (121) is configured to deflect light incident on the first deflection segment (121) to the second deflection surface (320), and wherein the first deflection segment (121) has a curvature opposite to that of the central segment (122) of the light input surface.

2. The lighting device according to claim 1, wherein, The lighting device (10) includes at least two light sources (50), wherein the common light input section (110) includes at least two light-collecting elements (120), each of the at least two light-collecting elements (120) being assigned to one light source (50).

3. The lighting device according to claim 2, wherein, The light sources (50) are arranged in rows along only a horizontal straight line, and the corresponding light-collecting elements (120) are arranged in rows along only a horizontal straight line, wherein the horizontal straight line is substantially orthogonal to the main direction (X).

4. The lighting device according to any one of claims 1 to 3, wherein, The at least one light source (50) is constructed as an LED.

5. The lighting device according to any one of claims 1 to 3, wherein, The at least one light-collecting element (120) is configured as a TIR lens.

6. The lighting device according to any one of claims 1 to 3, wherein, The light emitting surface and the shell surface (140) intersect along a common surface segment line (150), which forms an asymmetric cutoff boundary for the low beam light distribution (LB).

7. The lighting device according to any one of claims 1 to 3, wherein, The projection lens system (200) includes an optical axis (A) and the light emitting surface (300) has a surface vector (V) that is tilted relative to the optical axis (A) of the projection lens system (200).

8. The lighting device according to claim 6, wherein, The projection lens system (200) includes a curved focal plane (F), wherein the light emitting surface (300) is inclined relative to the curved focal plane (F) such that only the common surface segment line (150) is arranged in the curved focal plane (F).

9. The lighting device according to claim 8, wherein, The projection lens system (200) includes an optical axis (A) and the light emitting surface (300) has a surface vector (V) that is tilted relative to the optical axis (A) of the projection lens system (200), wherein the surface vector (V) of the light emitting surface (300) is tilted upward when viewed in the correct installation state of the lighting device (10) in the vehicle.

10. The lighting device according to any one of claims 1 to 3, wherein, The at least one light-collecting element (120) includes a second deflection segment (123) corresponding to the first deflection surface (310), wherein the second deflection segment (123) is configured to deflect light incident on the second deflection segment (123) to the first deflection surface (310), wherein when incident on the second deflection segment (123), the light follows a fourth light path (LR4), and wherein the fourth light path (LR4) contributes to the low beam light distribution (LB).

11. The lighting device according to any one of claims 1 to 3, wherein, The at least one light source (50) emits light in a light emission direction (X1), wherein the at least one light source (50) is arranged such that the light emission direction (X1) is not parallel to the main direction (X) of the lighting device (10).

12. The lighting device according to claim 8, wherein, The curved focal surface (F) is a Petzvar surface.

13. The lighting device according to claim 1, wherein, The first deflection section (121) has a concave portion.

14. A motor vehicle headlight comprising at least one lighting device (10) according to any one of claims 1 to 13.

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