Automobile headlamp

Abstract

The utility model discloses an automobile headlamp which comprises an asymmetric double-free-form-surface lens, a radiator is arranged at one end of the asymmetric double-free-form-surface lens, a first LED light source and a second LED light source are arranged on the radiator respectively, a varifocal ellipsoid reflector distributed corresponding to the first LED light source is arranged on the radiator, and a second varifocal ellipsoid reflector distributed corresponding to the second LED light source is arranged on the second LED light source. A high beam free-form surface reflector is arranged on the outer side of the second LED light source. The automobile headlamp is stable in light spot color temperature, small in size of an optical system and capable of improving illumination of light, the illumination width can reach 16 m during passing light, a large field angle can be provided for a driver due to the wide illumination range, the driver can conveniently know the road condition around an automobile in advance, and in the wide illumination range, the driver can conveniently know the road condition around the automobile in advance. A straight cut-off line is still obtained, and the phenomenon that the cut-off line warps upwards due to a large illumination range is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, and in particular relates to an automotive headlight. Background Technology

[0002] Headlights are lighting devices mounted on both sides of the front of a car for nighttime driving. They are available in two-lamp and four-lamp systems. The effectiveness of headlights directly affects driving maneuverability and traffic safety at night.

[0003] Existing automotive headlight optical systems include separate high and low beam optical systems and integrated high and low beam optical systems, which have problems such as large size and low illumination of high beam. Utility Model Content

[0004] The purpose of this utility model is to provide an automotive headlight to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows: A car headlight includes an asymmetric double freeform surface lens, a heat sink is provided at one end of the asymmetric double freeform surface lens, a first LED light source and a second LED light source are respectively provided on the heat sink, a zoom ellipsoidal reflector corresponding to the first LED light source is provided on the heat sink, a high beam freeform surface reflector is provided on the outer side of the second LED light source, and a baffle is provided in the middle part of the inlet of the asymmetric double freeform surface lens.

[0006] Preferably, one end of the heat sink is set as an inclined surface, the second LED light source is mounted on the inclined surface, and the first LED light source is mounted on the upper surface of the heat sink.

[0007] Preferably, the inclined planes are distributed at a 45° angle.

[0008] Preferably, both the first LED light source and the second LED light source are connected to the heat sink via a copper substrate, and silicone is disposed between the copper substrate and the surface of the heat sink.

[0009] Preferably, the end of the radiator is fixedly connected to the asymmetric double freeform lens via a bracket, and both ends of the baffle are fixedly connected to the bracket via connecting rods.

[0010] Preferably, the baffle has an arc-shaped structure.

[0011] Preferably, the freeform surface reflector for high beams is a hollow conical structure, and both ends of the freeform surface reflector for high beams are designed to be open.

[0012] The automotive headlight of this utility model has the following advantages:

[0013] This invention features a stable color temperature of the automotive headlight spot, a compact optical system, and improved illuminance. In low beam mode, the illumination width can reach 16m, providing the driver with a wide field of view to better understand the road conditions around the vehicle. Furthermore, even with such a wide illumination range, a straight cutoff line is maintained, avoiding the upward tilting of the cutoff line that often occurs with large illumination ranges. The maximum illuminance of the high beam is 94.82 lux, providing a bright lighting environment even in poorly lit areas. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 for Figure 1 A structural diagram from another perspective;

[0017] Figure 3 for Figure 1 Front view;

[0018] Figure 4 This is a schematic diagram of the radiator structure in this utility model.

[0019] The markings in the diagram are as follows: 1. Heat sink; 2. Inclined surface; 3. First LED light source; 4. Copper substrate; 5. Variable focal length ellipsoidal reflector; 6. Support; 7. Asymmetric double freeform surface lens; 8. Baffle; 9. Linkage rod; 10. Second LED light source; 11. High beam freeform surface reflector. Detailed Implementation

[0020] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0021] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0024] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0025] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of an automotive headlight according to this utility model.

[0026] like Figure 1-4As shown, this utility model discloses an automotive headlight, including an asymmetric double freeform surface lens 7. A heat sink 1 is provided at one end of the asymmetric double freeform surface lens 7. A first LED light source 3 and a second LED light source 10 are respectively disposed on the heat sink 1. A zoom ellipsoidal reflector 5, corresponding to the first LED light source 3, is disposed on the heat sink 1. A high beam freeform surface reflector 11 is disposed outside the second LED light source 10. The high beam freeform surface reflector 11 has a hollow conical structure, and both ends of the high beam freeform surface reflector 11 are open. By using the high beam freeform surface reflector 11, the light emission angle of the light source is reduced, improving light energy utilization. In terms of efficiency, a baffle 8 is provided in the middle of the inlet of the asymmetric double freeform surface lens 7. The end of the heat sink 1 is fixedly connected to the asymmetric double freeform surface lens 7 through the bracket 6, and the two ends of the baffle 8 are fixedly connected to the bracket 6 through the connecting rod 9. The baffle 8 has an arc-shaped structure. The focal point of the asymmetric double freeform surface lens 7 is not at a single point, but on an arc. If a straight baffle 8 is used, the cutoff line will tilt upward at a certain angle. Moreover, the wider the horizontal illumination width of the near beam, the more severe the tilt of the cutoff line. In order to make the baffle 8 better imaged on the target surface to form a straight cutoff line, the overall contour of the baffle 8 is bent by a certain arc.

[0027] One end of the heat sink 1 is set as an inclined surface 2. The second LED light source 10 is installed on the inclined surface 2, and the first LED light source 3 is installed on the upper surface of the heat sink 1. When the first LED light source 3 is lit, the light is reflected by the inner surface of the zoom ellipsoidal reflector 5 and focused at the second focal point of the zoom ellipsoidal reflector 5. Then, after passing through the baffle 8 and the lower half of the asymmetric double freeform surface lens 7, the light is distributed to form a near-beam spot on the test screen 25 meters away. The baffle 8 is used to form a 45° cutoff line and block stray light. Then, the second LED light source 10 is lit, and the light is reflected and converged by the far-beam freeform surface reflector 11. Then, the light is distributed by the upper half of the asymmetric double freeform surface lens 7 and superimposed with the near-beam spot to form the far-beam spot. The inclined surface 2 is distributed at a 45° angle, so that the second LED light source 10 is distributed at a 45° angle. Both the first LED light source 3 and the second LED light source 10 are connected to the heat sink 1 through the copper substrate 4, and silicone is provided between the copper substrate 4 and the surface of the heat sink 1. The heat sink 1 is composed of a heat-conducting plate and heat sink fins, which is a mature existing technology and will not be described in detail here. By applying silicone between the copper substrate 4 and the heat sink 1, the position of the light source is fixed and heat is transferred. Through the heat sink 1, heat can be dissipated from the LED light source, so that the LED light source can emit light normally and ensure the normal operation of the headlight system.

[0028] The working principle of this automotive headlight is as follows: the reflectivity of the zoom ellipsoidal reflector 5 and the freeform surface reflector 11 is set to 90%, the baffle 8 is used as a light absorber, and the lens material is selected as PMMA, which has a higher Abbe number than PC material. The refractive index of different wavelengths of light is not significantly different, which can effectively suppress light dispersion. In low beam mode, the illumination width can reach 16m. This wide illumination range provides the driver with a large field of view, making it easier to anticipate road conditions around the vehicle. Even with such a wide illumination range, a straight cutoff line is still achieved, avoiding the upward tilting of the cutoff line caused by a large illumination range. The maximum high beam illuminance is 94.82 lux, providing a bright lighting environment even in poorly lit road conditions.

[0029] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A car headlight, characterized in that: The asymmetric double freeform surface lens (7) is provided with a heat sink (1) at one end. A first LED light source (3) and a second LED light source (10) are respectively provided on the heat sink (1). A variable focal length ellipsoidal reflector (5) corresponding to the first LED light source (3) is provided on the heat sink (1). A far-beam freeform surface reflector (11) is provided on the outer side of the second LED light source (10). A baffle (8) is provided in the middle part of the inlet of the asymmetric double freeform surface lens (7).

2. The automotive headlight according to claim 1, characterized in that: One end of the heat sink (1) is set as a slope (2), the second LED light source (10) is installed on the slope (2), and the first LED light source (3) is installed on the upper surface of the heat sink (1).

3. The automotive headlight according to claim 2, characterized in that: The inclined plane (2) is distributed at a 45° angle.

4. The automotive headlight according to claim 1, characterized in that: Both the first LED light source (3) and the second LED light source (10) are connected to the heat sink (1) through a copper substrate (4), and silicone is provided between the copper substrate (4) and the surface of the heat sink (1).

5. A car headlight according to claim 1, characterized in that: The end of the radiator (1) is fixedly connected to the asymmetric double freeform lens (7) via a bracket (6), and the two ends of the baffle (8) are fixedly connected to the bracket (6) via a connecting rod (9).

6. A car headlight according to claim 1, characterized in that: The baffle (8) has an arc-shaped structure.

7. A car headlight according to claim 1, characterized in that: The freeform surface reflector (11) is a hollow conical structure, and both ends of the freeform surface reflector (11) are open.

Images