Projection module for headlamp of motor vehicle

Abstract

The invention relates to a projection module for a headlight of a motor vehicle, comprising: at least one first light source having at least one light-emitting diode for emitting light for generating a first light distribution; at least one second light source having at least one light emitting diode for emitting light for producing a second light distribution; the invention relates to a primary optical system (1) comprising a first optical waveguide (3) having at least one light entry surface (5) and at least one light exit surface (7) for light emitted from the at least one first light source, and a second optical waveguide (4) having at least one light exit surface (7) for light emitted from the at least one first light source, the second light conductor has at least one light entry surface (6) and at least one light exit surface (8) for light emitted from the at least one second light source; a secondary optic (2) through which the light exiting from the light exit surface of the primary optic passes, at least one or more or each light-emitting diode of the individual light source being designed to emit light having a brightness greater than 400 cd / mm2.

Description

Technical Field

[0001] The invention relates to a projection module for a headlight of a motor vehicle according to the preamble of claim 1 . Background Art

[0002] A projection module of the above-mentioned type is known from DE 10 2019 11 8 968 A1. The projection module described therein comprises a plurality of first light sources and a plurality of second light sources and a primary optical device having a first optical waveguide and a second optical waveguide. The light emitted by the first light source is used to generate a first light distribution, while the light emitted by the second light source is used to generate a second light distribution. The first light distribution may be part of a high beam distribution, while the second light distribution may be part of a low beam distribution. Here, the first optical waveguide is used to preform the light emitted by the first light source, while the second optical waveguide is used to preform the light emitted by the second light source. The projection module also comprises a secondary optical device for imaging the light emitted from the primary optical device in an area in front of the motor vehicle.

[0003] Styling and design play a very important role in automotive headlights, so that manufacturers use these components to influence the appearance and recognition value of the vehicle. Therefore, the current trend is to adopt a small, inconspicuous main light function. At the same time, the importance of rating (i.e., qualitative and quantitative evaluation of light distribution) increases. It is necessary to present a clear light-dark boundary, high intensity near the light-dark boundary, and uniform light distribution. For this purpose, a projection module as mentioned in DE102019118968A1 is provided. However, due to the necessary size of the lens used as a secondary optical device and the optical device that distributes the light, the structural size of such a projection module currently finds less and less space in modern headlights. The previous scheme of such a projection module requires a relatively thick aspherical lens used as a secondary optical device. In addition, the typical appearance of such a lens does not meet the styling requirements of modern headlights, in which the main light function retreats to a secondary position in order to display (Inszenierung) signal light. More components are installed in the headlight, so that the available space for the main light function is reduced. Summary of the invention

[0004] The problem underlying the invention is to provide a projection module of the type mentioned in the introduction which is of more compact design and which, in particular, can additionally generate a high intensity near the light-dark boundary and has an appearance that complies with current design requirements.

[0005] This is achieved by a projection module of the type mentioned in the introduction having the characterizing features of claim 1. The dependent claims relate to preferred embodiments of the invention.

[0006] According to claim 1, at least one or more or each light emitting diode of each light source is designed to emit a brightness greater than 400 cd / mm 2 Here, it can be provided that at least one or more or each light emitting diode of each light source is designed to emit a brightness greater than 420 cd / mm 2 Light, especially the emission brightness of 430cd / mm 2 Up to 450cd / mm 2 The light between the two, for example, the emission brightness is about 440 cd / mm 2 The brightness of the light emitted by such a light emitting diode is significantly higher than the brightness of the light emitting diodes used in the projection module according to DE 10 2019 118 968 A1 mentioned at the beginning. The higher brightness of the light used makes it possible to achieve smaller dimensions of the primary optical system overall. In addition, a higher light intensity is generated near the light-dark boundary.

[0007] It is feasible that at least one or more or each light emitting diode of each light source is designed to emit light with a luminous flux of 200 lm to 300 lm, in particular to emit light with a luminous flux of 225 lm to 275 lm, for example, to emit light with a luminous flux of about 250 lm. In addition, at least one or more or each light emitting diode of each light source has an active light radiating surface having a size of 0.40 mm 2 Up to 0.70mm 2 Between, especially between 0.50mm 2 Up to 0.60mm 2 Between, for example, about 0.56mm 2 The light-emitting diodes used can in particular be so-called high-brightness light-emitting diodes (LEDs).

[0008] It can be provided that the length of the primary optical system from at least one light entrance surface of the first optical waveguide to at least one light exit surface of the first optical waveguide is between 17 mm and 30 mm, in particular between 20 mm and 27 mm, preferably about 23.5 mm. In contrast, typical primary optical systems, such as those described in DE 10 2019 118 968 A1, are about 47 mm long. In addition, it can be provided that the volume of the primary optical system is between 3 cm 3 Up to 7cm 3 between, especially between 4cm 3 Up to 6cm 3 between, preferably about 5cm 3 In contrast, typical primary optical systems, such as those described in DE 10 2019 118 968 A1, have a diameter of approximately 34 cm. 3The primary optics of the projection module according to the invention are therefore significantly more compact than the primary optics of projection modules known from the prior art, so that a smaller installation space is required for the projection module according to the invention. In particular, the primary optics can include an (in particular integral) optical component or be designed as an (in particular integral) optical component, wherein the optical component has a first optical waveguide and a second optical waveguide.

[0009] It is possible that the secondary optical system includes a projection lens or is configured as a projection lens, wherein the projection lens has a light entrance surface for light exiting from a light exit surface of the primary optical system and a light exit surface for light incident through the light entrance surface. The projection lens can be configured as a Fresnel lens, in particular the projection lens has at least one Fresnel structure, which is arranged on the light entrance surface and / or on the light exit surface of the projection lens. By configuring the projection lens as a Fresnel lens, the secondary optical system can be significantly more compact than the secondary optical system of the projection module known from the prior art. In addition, the Fresnel structure produces a more modern appearance of the secondary optical system.

[0010] It can be provided that the length of the optics of the projection module formed by the primary optics and the secondary optics in the direction in which the light entrance surface of the primary optics and the light exit surface of the secondary optics lie opposite each other is between 40 mm and 70 mm, in particular between 50 mm and 60 mm, preferably about 56 mm. In contrast, typical optics, as described, for example, in DE 10 2019 118 968 A1, are about 112 mm long. Therefore, the compact dimensions of the primary optics and the secondary optics together contribute to a significant reduction in the installation space requirement of the projection module according to the invention compared to the prior art.

[0011] It is possible that the first light distribution is a high-beam light distribution or a part of a high-beam light distribution and / or the second light distribution is a low-beam light distribution or a part of a low-beam light distribution.

[0012] It can be provided that the projection module comprises more than one first light source and / or more than one second light source. It can also be provided that the first light guide has more than one light entrance surface and / or the second light guide has more than one light entrance surface.

[0013] Here, each of the first light sources can be equipped with one of the light incident surfaces of the first optical waveguide, so that the light emitted from the corresponding first light source is incident on the first optical waveguide through the equipped light incident surface, and / or each of the second light sources can be equipped with one of the light incident surfaces of the second optical waveguide, so that the light emitted from the corresponding second light source is incident on the second optical waveguide through the equipped light incident surface.

[0014] It is possible that the first optical waveguide has a common light exit surface for light incident through multiple light incident surfaces, and / or the second optical waveguide has multiple light exit surfaces spaced apart from each other, each of which is assigned to one of the light incident surfaces so that light incident through the corresponding light incident surface exits the second optical waveguide through the assigned light exit surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is explained in more detail below with the aid of the accompanying drawings. In the drawings:

[0016] Figure 1 A perspective view showing a portion of a projection module according to the present invention;

[0017] Figure 2 Show according to Figure 1 a side view of the portion of the projection module;

[0018] Figure 3 Show according to Figure 1 a top view of the portion of the projection module;

[0019] Figure 4 A top view of a portion of a projection module according to the prior art is shown. DETAILED DESCRIPTION

[0020] In the figures, identical parts and parts with identical functions are provided with the same reference symbols.

[0021] exist Figures 1 to 3 The embodiment of the projection module according to the present invention shown in EMBODIMENT 1 comprises a plurality of first light sources (not shown), a plurality of second light sources (not shown), a primary optical device 1 and a secondary optical device 2.

[0022] The first light source and the second light source each have at least one light emitting diode (LED). At least one or more light emitting diodes of each light source, preferably each light emitting diode of each light source, are designed to emit a brightness greater than 400 cd / mm 2 Here, it can be provided that at least one or more light-emitting diodes of each light source, preferably each light-emitting diode of each light source, is designed to emit a brightness greater than 420 cd / mm 2 Light, especially the emission brightness of 430cd / mm 2 Up to 450cd / mm 2 The light between the two, for example, the emission brightness is about 440cd / mm 2In addition, at least one or more light-emitting diodes of each light source, preferably each light-emitting diode of each light source, are designed to emit light with a luminous flux of 200 lm to 300 lm, in particular to emit light with a luminous flux of 225 lm to 275 lm, for example, to emit light with a luminous flux of about 250 lm. In addition, at least one or more light-emitting diodes of each light source, preferably each light-emitting diode of each light source, have an active light-radiating surface having a size of 0.40 mm 2 Up to 0.70mm 2 Between, especially between 0.50mm 2 Up to 0.60mm 2 between, for example, about 0.56 mm 2 The light-emitting diodes used can in particular be so-called high-brightness light-emitting diodes.

[0023] The first light source is designed to emit light for generating a first light distribution, in particular a high beam distribution or a part of a high beam distribution. The second light source is designed to emit light for generating a second light distribution, in particular a low beam distribution or a part of a low beam distribution. The first light source and the second light source can be controlled separately to generate a desired light distribution.

[0024] The primary optical system 1 has a first optical waveguide 3 and a second optical waveguide 4. The first optical waveguide 3 and the second optical waveguide 4 each have a plurality of light entry surfaces 5, 6. The light entry surfaces 5 of the first optical waveguide 3 are arranged side by side in a row, and the light entry surfaces 6 of the second optical waveguide 4 are also arranged side by side in a row, which is arranged parallel to the row of light entry surfaces 5 of the first optical waveguide 3 and above it.

[0025] One of the light incident surfaces 5 of the first optical waveguide 3 is assigned to each of the first light sources, so that the light emitted from the corresponding first light source is incident on the first optical waveguide 3 through the assigned light incident surface 5. In addition, one of the light incident surfaces 6 of the second optical waveguide 4 is assigned to each of the second light sources, so that the light emitted from the corresponding second light source is incident on the second optical waveguide 4 through the assigned light incident surface 6.

[0026] The first optical waveguide 3 has a common light exit surface 7 for light incident through the plurality of light incident surfaces 5. The second optical waveguide has a plurality of light exit surfaces 8 spaced apart from one another, each of which is assigned to one of the light incident surfaces 6, so that light incident through the corresponding light incident surface 6 is emitted from the second optical waveguide 4 through the assigned light exit surface 8.

[0027] If especially by Figure 2As can be seen, the first optical waveguide 3 is longer in the propagation direction of the light than the second optical waveguide 4. An aperture 9 extends above the first optical waveguide 3 and has a Figure 2 The aperture edge 10 is arranged on the right in the middle. The light emerging from the light exit surface 8 of the second optical waveguide 4 is partially reflected by the upper side of the aperture 9, wherein the aperture edge 10 is used to generate a horizontal light-dark boundary in the low beam distribution.

[0028] The primary optics is designed, in particular, as a monolithic optical component which has the first and second optical waveguides 3 , 4 and the aperture 9 .

[0029] The length LP of the primary optical system from the light entrance surface 5 of the first optical waveguide 3 to the light exit surface 7 of the first optical waveguide 3 is between 17 mm and 30 mm, in particular between 20 mm and 27 mm, preferably about 23.5 mm. In addition, the volume of the primary optical system is between 3 cm 3 Up to 7cm 3 between, especially between 4cm 3 Up to 6cm 3 between, preferably about 5cm 3 .

[0030] The secondary optical device 2 is configured as a projection lens, which projects the light emitted from the primary optical device into the exterior space of the motor vehicle to generate a desired light distribution. The projection lens used as the secondary optical device 2 has a light incident surface 11 for the light emitted from the light exit surfaces 7, 8 of the primary optical device 1 and a light exit surface 12 for the light incident through the light incident surface 11. The projection lens can be configured as a Fresnel lens, wherein the projection lens has at least one Fresnel structure 13 (see Figure 1 ), the Fresnel structure is arranged on the light incident surface 11 and / or the light exit surface 12 of the projection lens.

[0031] The length LG of the optical system of the projection module formed by the primary optical system 1 and the secondary optical system 2 in the direction in which the light entrance surfaces 5, 6 of the primary optical system and the light exit surface 12 of the secondary optical system are opposite is between 40 mm and 70 mm, in particular between 50 mm and 60 mm, preferably about 56 mm. Figure 4 In order to make the distinction clear, a typical optical device according to the prior art is shown, which has a primary optical device 1' and a secondary optical device 2'. The length LG' of the optical device is about 112 mm.

[0032] Reference numerals list

[0033] 1 Primary Optics

[0034] 1'Primary optical device according to the prior art

[0035] 2 Secondary Optics

[0036] 2' Secondary optical device according to the prior art

[0037] 3First optical conductor

[0038] 4 Second photoconductor

[0039] 5 Light incident surface of the first light guide

[0040] 6 Light incident surface of the second light guide

[0041] 7 Light exit surface of the first light guide

[0042] 8 Light exit surface of the second optical waveguide

[0043] 9-stop

[0044] 10 Aperture edge

[0045] 11 Light incident surface of secondary optical device

[0046] 12 Light exit surface of secondary optical device

[0047] 13 Fresnel structure

[0048] LP Primary Optics Length

[0049] LG Optics Length

[0050] LG's length of optical device according to prior art

Claims

1. A projection module for a headlamp of a motor vehicle, the projection module comprising: at least one first light source, which is designed to emit light for generating a first light distribution, and which has at least one light-emitting diode, at least one second light source, which is designed to emit light for generating a second light distribution, and which has at least one light-emitting diode, - a primary optical system (1), comprising a first optical waveguide (3) and a second optical waveguide (4), the first optical waveguide (3) having at least one light entrance surface (5) for light emitted by the at least one first light source and having at least one light exit surface (7), and the second optical waveguide (4) having at least one light entrance surface (6) for light emitted by the at least one second light source and having at least one light exit surface (8), and a secondary optical device (2) through which the light emerging from the light exit surface (7, 8) of the primary optical device (1) passes during operation of the projection module, Characterized in that at least one or more or each light emitting diode of each light source is designed to emit a brightness greater than 400 cd / mm 2 of light.

2. The projection module according to claim 1, characterized in that: At least one or more or each light emitting diode of each light source is designed to emit a brightness greater than 420 cd / mm 2 Light, especially the emission brightness of 430cd / mm 2 Up to 450cd / mm 2 The light between the two, for example, the emission brightness is about 440 cd / mm 2 of light.

3. The projection module according to any one of claims 1 or 2, characterized in that: At least one or more or each light emitting diode of each light source is designed to emit light with a luminous flux of 200 lm to 300 lm, in particular 225 lm to 275 lm, for example about 250 lm.

4. The projection module according to any one of claims 1 to 3, characterized in that: At least one or more or each light emitting diode of each light source has an active light radiating surface having a size of 0.40 mm 2 Up to 0.70mm 2 Between, especially between 0.50mm 2 Up to 0.60mm 2 Between, for example, about 0.56mm 2 .

5. The projection module according to any one of claims 1 to 4, characterized in that: The length (LP) of the primary optical system (1) from the at least one light entrance surface (5) of the first optical waveguide (3) to the at least one light exit surface (7) of the first optical waveguide (3) is between 17 mm and 30 mm, in particular between 20 mm and 27 mm, preferably about 23.5 mm.

6. The projection module according to any one of claims 1 to 5, characterized in that: The volume of the primary optical device (1) is 3 cm 3 Up to 7cm 3 between, especially between 4cm 3 Up to 6cm 3 between, preferably about 5cm 3 .

7. The projection module according to any one of claims 1 to 6, characterized in that: The primary optical system (1) comprises an optical component, in particular an integral optical component, or is designed as an optical component, in particular an integral optical component, which has the first and the second optical waveguide (3, 4).

8. The projection module according to any one of claims 1 to 7, characterized in that: The secondary optical device (2) comprises a projection lens or is configured as a projection lens, the projection lens having a light incident surface (11) for light emitted from a light exit surface (7, 8) of the primary optical device (1) and a light exit surface (12) for light incident through the light incident surface (11).

9. The projection module according to claim 8, characterized in that: The projection lens is configured as a Fresnel lens, and in particular, the projection lens comprises at least one Fresnel structure, wherein the Fresnel structure is arranged on a light entrance surface (11) and / or a light exit surface (12) of the projection lens.

10. The projection module according to any one of claims 1 to 9, characterized in that: The first light distribution is a high-beam distribution or a part of a high-beam distribution, and / or the second light distribution is a low-beam distribution or a part of a low-beam distribution.

11. The projection module according to any one of claims 1 to 10, characterized in that: The length (LG) of the optical system of the projection module formed by the primary optical system (1) and the secondary optical system (2) in the direction in which the light entrance surface (5, 6) of the primary optical system (1) and the light exit surface (12) of the secondary optical system (2) are opposite is between 40 mm and 70 mm, in particular between 50 mm and 60 mm, preferably about 56 mm.

12. The projection module according to any one of claims 1 to 11, characterized in that: The projection module includes more than one first light source and / or more than one second light source.

13. The projection module according to any one of claims 1 to 12, characterized in that: The first optical waveguide (3) has more than one light entrance surface (5), and / or the second optical waveguide (4) has more than one light entrance surface (6).

14. The projection module according to any one of claims 12 or 13, characterized in that: One of the light incident surfaces (5) of the first optical waveguide (3) is provided for each of the first light sources, so that light emitted from the corresponding first light source is incident on the first optical waveguide (3) through the provided light incident surface (5), and / or one of the light incident surfaces (6) of the second optical waveguide (4) is provided for each of the second light sources, so that light emitted from the corresponding second light source is incident on the second optical waveguide (4) through the provided light incident surface (6).

15. The projection module according to any one of claims 1 to 14, characterized in that: The first optical waveguide (3) has a common light exit surface (7) for light incident through the plurality of light incident surfaces (5), and / or the second optical waveguide (4) has a plurality of light exit surfaces (8) spaced apart from one another, each of the light exit surfaces being assigned to one of the light incident surfaces (6) so that light incident through the corresponding light incident surface (6) exits the second optical waveguide (4) through the assigned light exit surface (8).

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