Motor vehicle headlamp

Abstract

The embodiment of the application discloses a motor vehicle headlamp. The motor vehicle headlamp provided by the embodiment of the application comprises a blue laser for emitting blue laser; a phosphor located on an outgoing path of the blue laser, wherein the phosphor emits white light in a region irradiated by the blue laser; a high beam lens group located on an outgoing path of the phosphor, wherein the high beam lens group projects the white light emitted by the phosphor to a low beam region or a high beam region; and a control system and a scanning galvanometer, wherein the scanning galvanometer vibrates and scans the blue laser to a preset region of the phosphor under the control of the control system. The embodiment of the application discloses a motor vehicle headlamp, realizes zoned lighting of the motor vehicle headlamp, realizes different changes of the motor vehicle headlamp to light irradiation states in different environments and different road conditions, and reduces safety hazards.

Description

[0001] This application claims priority to patent application number 202211076484.9 (the earlier application was filed on September 5, 2022, and the invention is entitled "A Motor Vehicle Headlight"). Technical Field

[0002] This invention relates to motor vehicle lighting technology, and more particularly to a motor vehicle headlight. Background Technology

[0003] Motor vehicle headlights are crucial for nighttime driving safety. Currently, there are four main types of headlight sources on the market: halogen lamps, xenon lamps, LED lamps, and laser lamps. With technological advancements, laser lamps are increasingly being adopted as the light source for motor vehicle headlights.

[0004] When driving at night, drivers usually use the headlight control lever to adjust the high and low beams to switch between them. Currently, the headlight lenses of motor vehicles are designed for illumination, meaning they only consider the field of view projected by the headlights.

[0005] As vehicle speeds increase and road conditions become more varied and complex, the traditional fixed lighting modes of high and low beams can no longer meet people's needs. Due to the limited illumination angle of traditional headlights, there are dark areas when vehicles turn, creating blind spots for drivers and affecting their judgment of obstacles. When headlights are on during normal driving, they can shine directly onto oncoming vehicles or pedestrians, causing glare and creating safety hazards. Summary of the Invention

[0006] This invention provides a motor vehicle headlight that enables zoned lighting, allowing the headlight to adjust its illumination state differently for different environments and road conditions, thereby reducing safety hazards.

[0007] This invention provides a motor vehicle headlight, comprising:

[0008] A blue laser emits blue laser light; a phosphor is located in the emission path of the blue laser, and the area of ​​the phosphor irradiated by the blue laser emits white light; a high beam lens assembly is located in the emission path of the phosphor, projecting the white light emitted by the phosphor onto a near beam or high beam area; and a control system and a scanning galvanometer, wherein the scanning galvanometer, under the control of the control system, vibrates and scans the blue laser light onto a preset area of ​​the phosphor; wherein the high beam lens assembly includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis, the first lens, the second lens, the third lens, and the fourth lens are all spherical lenses; the first lens is located between the second lens and the phosphor; the first lens and the second lens are both concave-convex lenses, the third lens is a plano-concave lens, and the fourth lens is a biconvex lens.

[0009] Optionally, the preset region includes the entire region of the phosphor.

[0010] Optionally, the phosphor includes a first region and a second region arranged in a vertical direction, with the first region located on one side of the second region in the vertical direction; the preset region includes the first region.

[0011] In one particular embodiment, the first region includes a first sub-region and a second sub-region arranged in a horizontal direction, the second sub-region being located on one side of the first sub-region in the horizontal direction; the width of the first sub-region in the vertical direction is greater than the width of the second sub-region in the vertical direction.

[0012] Optionally, the phosphor includes a third region, a fourth region, and a fifth region arranged in a horizontal direction, with the fourth region located between the third and fifth regions; the preset region includes the third and fifth regions.

[0013] Optionally, the preset area includes traffic signs.

[0014] Optionally, the third and fourth lenses are cemented together to form a cemented lens group.

[0015] Optionally, along the optical axis, the distance between the first lens and the second lens is greater than or equal to 20 mm and less than or equal to 25 mm; the distance between the second lens and the third lens is greater than or equal to 0.1 mm and less than or equal to 2 mm; along the optical axis.

[0016] Optionally, along the optical axis, the distance between the first lens and the phosphor is greater than or equal to 1.5 mm and less than or equal to 3.5 mm.

[0017] Optionally, the motor vehicle headlight also includes a beam shaping lens, a first reflector, a second reflector, a light-emitting diode, and a low beam lens; the blue laser emitted by the blue laser is focused by the beam shaping lens and projected onto the first reflector, which then reflects it to a scanning galvanometer. The scanning galvanometer vibrates and scans the blue laser to the second reflector, which then reflects it to a preset area of ​​the phosphor; the light emitted by the light-emitting diode is projected onto the low beam area by the low beam lens.

[0018] An embodiment of the present invention provides a motor vehicle headlight comprising a blue laser, a phosphor, a high beam lens assembly, a control system, and a scanning galvanometer. Under the control of the control system, the scanning galvanometer vibrates and scans the blue laser to a preset area of ​​the phosphor, enabling the motor vehicle headlight to perform zoned illumination. This allows the motor vehicle headlight to adjust its illumination state according to different environments and road conditions, reducing safety hazards. Furthermore, the design of the high beam lens assembly optimizes the clarity of the zoning and projection, while also making the overall lens structure of the headlight compact.

[0019] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a motor vehicle headlight provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of a phosphor provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of another phosphor provided in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of another phosphor provided in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of a high beam lens assembly provided in an embodiment of the present invention;

[0025] Figure 6 A simulation diagram of the low beam illumination mode of a motor vehicle headlight provided in an embodiment of the present invention;

[0026] Figure 7 A simulation diagram of the high beam illumination mode of a motor vehicle headlight provided in an embodiment of the present invention;

[0027] Figure 8 A simulation diagram illustrating the effect of a motor vehicle headlight activating zoned lighting mode according to an embodiment of the present invention;

[0028] Figure 9 A simulation of the effect of using the lens assembly in an existing motor vehicle headlight to activate the zone lighting mode;

[0029] Figure 10 This is a simulation diagram of the image projection mode of a motor vehicle headlight being turned on, provided in an embodiment of the present invention. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0031] Figure 1 This is a schematic diagram of a motor vehicle headlight provided in an embodiment of the present invention, as shown below. Figure 1 As shown, this embodiment provides a motor vehicle headlight including a blue laser 2, a phosphor 7, and a high beam lens assembly 8. The blue laser 2 emits blue laser light. The phosphor 7 is located in the emission path of the blue laser. The area of ​​the phosphor 7 irradiated by the blue laser emits white light. The high beam lens assembly 8, located in the emission path of the phosphor 7, projects the white light emitted by the phosphor 7 onto either the low beam area or the high beam area. The low beam area is the illumination area when the motor vehicle headlight is in low beam mode, and the high beam area is the illumination area when the motor vehicle headlight is in high beam mode. Typically, the distance from the farthest point of the high beam area to the motor vehicle is greater than the distance from the farthest point of the low beam area to the motor vehicle. The motor vehicle headlight also includes a control system 1 and a scanning galvanometer 5. Under the control of the control system 1, the scanning galvanometer 5 vibrates and scans the blue laser light onto a preset area of ​​the phosphor 7.

[0032] The preset area is the region on the phosphor 7 where the scanning galvanometer 5 vibrates and scans the blue laser under the control of the control system. For example, the preset area can be a part of the phosphor 7 or the entire area of ​​the phosphor 7.

[0033] An embodiment of the present invention provides a motor vehicle headlight comprising a blue laser 2, a phosphor 7, a high beam lens assembly 8, a control system 1, and a scanning galvanometer 5. Under the control of the control system 1, the scanning galvanometer 5 vibrates and scans the blue laser to a preset area of ​​the phosphor 7. This allows the motor vehicle headlight to provide zoned illumination, enabling the headlight to adjust its illumination state according to different environments and road conditions, thereby reducing safety hazards.

[0034] Optionally, the preset area includes the entire area of ​​phosphor 7. That is, under the control of the control system 1, the scanning galvanometer 5 vibrates and scans the entire area of ​​phosphor 7 with blue laser light, causing the entire area of ​​phosphor 7 to generate white light under the excitation of the blue laser. Thus, both the upper and lower halves of phosphor 7 generate white light. The white light generated by the upper half of phosphor 7 is imaged by the high beam lens group 8 to form an illumination beam at a relatively close distance to the vehicle. The white light generated by the lower half of phosphor 7 is imaged by the high beam lens group 8 to form an illumination beam at a relatively far distance to the vehicle. Therefore, this embodiment of the invention achieves a longer illumination distance, provides an illumination beam for the high beam area, and realizes the high beam illumination mode of the vehicle headlight. Figure 2 This is a schematic diagram of a phosphor provided in an embodiment of the present invention, with reference to... Figure 1 and Figure 2 The phosphor 7 comprises a first region S1 and a second region S2 arranged vertically, with the first region S1 located on one side of the second region S2 along the vertical direction. A preset region includes the first region S1 but does not include the second region S2. Under the control of the control system 1, the scanning galvanometer 5 vibrates and scans the upper half of the phosphor 7 with a blue laser, causing the upper half of the phosphor 7 to produce white light under the excitation of the blue laser. The lower half of the phosphor 7 does not produce white light as it is not irradiated by the blue laser. The white light produced by the upper half of the phosphor 7 is imaged by the high beam lens group 8 to form an illumination beam at a relatively close distance to the vehicle. Thus, this embodiment of the invention achieves both near and far illumination distances, provides an illumination beam for the low beam area, and realizes the low beam illumination mode of the vehicle headlight.

[0035] Optional, see reference Figure 1 and Figure 2 The first region S1 includes a first sub-region S11 and a second sub-region S12 arranged horizontally, with the second sub-region S12 located on one side of the first sub-region S11 along the horizontal direction. The vertical width of the first sub-region S11 is greater than the vertical width of the second sub-region S12. The first sub-region S11 and the second sub-region S12 form a corner-cut region S21, which is located within the second region S2 and is the area of ​​the phosphor 7 that is not irradiated by the blue laser. Therefore, white light will not be generated at the position corresponding to the corner-cut region S21, limiting the angle of the light emitted by the vehicle headlights illuminating the oncoming lane, so that the angle of the light emitted by the vehicle headlights illuminating the oncoming lane is not too high and will not cause visual interference to the oncoming lane.

[0036] Figure 3 This is a schematic diagram of another phosphor provided in an embodiment of the present invention, with reference to... Figure 1 and Figure 3The phosphor 7 includes a third region S3, a fourth region S4, and a fifth region S5 arranged horizontally, with the fourth region S4 located between the third region S3 and the fifth region S5. A preset region includes the third region S3 and the fifth region S5. A preset region does not include the fourth region S4. Under the control of the control system 1, the scanning galvanometer 5 vibrates and scans the blue laser to the third region S3 and the fifth region S5 of the phosphor 7, generating white light at the positions corresponding to the third region S3 and the fifth region S5. The fourth region S4 is a region of the phosphor 7 that is not irradiated by the blue laser, thus preventing the formation of white light at the position corresponding to the fourth region S4, limiting the illumination range of the light emitted by the vehicle headlight, and ensuring that the area corresponding to the fourth region S4 is not irradiated by the vehicle headlight.

[0037] For example, the fourth region S4 can represent the area corresponding to a pedestrian when the vehicle encounters a pedestrian during nighttime driving. The control system 1 acquires the area where the pedestrian is detected by the onboard sensors and controls the scanning mirror 5 not to scan that area, thus forming the fourth region S4. When the vehicle's headlights are on, the scanning mirror 5, under the control of the control system 1, forms a scanning area as shown in the image. Figure 3 The scanning area shown will prevent white light from forming at the position corresponding to the fourth region S4, thus ensuring that pedestrians within the area corresponding to the fourth region S4 will not be illuminated by the headlights of motor vehicles. The light emitted by the headlights of motor vehicles can avoid shining directly on pedestrians, reducing safety hazards.

[0038] It should be noted that the implementation methods for horizontally arranged areas irradiated and unirradiated by blue lasers can be combined with those for vertically arranged areas irradiated and unirradiated by blue lasers. For example, when the vehicle's headlights are in low beam mode, at least one of the horizontally arranged areas can be designated as an area unirradiated by blue lasers; or, when the vehicle's headlights are in high beam mode, at least one of the horizontally arranged areas can be designated as an area unirradiated by blue lasers.

[0039] Figure 4 This is a schematic diagram of another phosphor provided in an embodiment of the present invention, with reference to... Figure 1 and Figure 4The preset area includes traffic sign B. Traffic signs can be instruction signs, warning signs, prohibitory signs, directional signs (general road directional signs, highway directional signs), tourist area signs, road construction safety signs, etc., and this embodiment does not specify any particular type. The traffic sign corresponds to the preset area of ​​the phosphor 7, and the shape of the preset area resembles a traffic sign. When the scanning galvanometer 5, under the control of the control system 1, vibrates and scans the blue laser to the preset area of ​​the phosphor 7, the phosphor 7 in the area where traffic sign B is located is excited by the blue laser and produces white light. This light is imaged by the high beam lens group 8 and projected onto the driving lane or into the external space. The traffic sign can serve as a warning to vehicles and pedestrians ahead, reducing safety hazards.

[0040] Figure 5 This is a schematic diagram of the high beam lens assembly provided in an embodiment of the present invention, with reference to... Figure 5 The high beam lens assembly 8 includes a first lens 81, a second lens 82, a third lens 83, and a fourth lens 84 arranged sequentially along the optical axis. All four lenses are spherical lenses. Specifically, the first lens 81 is located between the second lens 82 and the phosphor 7, and is positioned close to the phosphor 7. The second lens 82 is located between the first lens 81 and the third lens 83, and the third lens 83 is located between the second lens 82 and the fourth lens 84. Both the first and second lenses 81 and 82 are concave-convex lenses, the third lens 83 is a plano-concave lens, and the fourth lens 84 is a biconvex lens. The surface of the concave-convex lens facing the phosphor 7 is concave, and the surface facing away from the phosphor 7 is convex. The surface of the plano-concave lens facing the phosphor 7 is planar, and the surface facing away from the phosphor 7 is concave. The surface of the biconvex lens facing the phosphor 7 is convex, and the surface facing away from the phosphor 7 is convex. Therefore, the first lens 81, the second lens 82 and the third lens 83 all have negative optical power, and the fourth lens 84 has positive optical power.

[0041] The lens F-number (the aperture size of a lens is represented by its F-number) of the high beam lens group 8 can be 0.55. If the divergence angle of the light source emitted from the phosphor 7 is θ, according to... The divergence angle θ is calculated to be approximately 65°. This means the high beam lens assembly 8 can collect light emitted by the phosphor 7 at a solid angle of 65°, improving the utilization efficiency of the light source. Furthermore, the high beam lens assembly 8 can achieve a resolution of 1 cycle / mm, which is beneficial for the projection work and zoned lighting of the high beam lens assembly 8.

[0042] Further reference Figure 1 and Figure 5 The following details the configuration of the high beam lens group 8:

[0043] Optionally, the convex and concave sides of each lens need to be coated with anti-reflection coatings to increase light transmission and reduce reflected light.

[0044] Optionally, the third lens 83 and the fourth lens 84 are cemented together to form a cemented lens group. The third lens 83 is a plano-concave lens, and the fourth lens 84 is a biconvex lens. The concave side of the third lens 83 is also the convex side of the fourth lens 84. That is, the concave side of the third lens 83 and the convex side of the fourth lens 84 are cemented together to form a coplanar surface. This can eliminate reflection loss on both surfaces of the lens, so that the white light imaging performance is higher than that of a single lens.

[0045] For example, in this design, the focal length range of the high beam lens group is 34.5≤f≤40.5.

[0046] For example, along the optical axis, the distance between the second lens 82 and the third lens 83 is greater than or equal to 0.1 mm and less than or equal to 2 mm. That is, the distance between the surface 104 of the second lens 82 away from the phosphor 7 and the surface 105 of the third lens 83 facing the phosphor 7 is greater than or equal to 0.1 mm and less than or equal to 2 mm. The distance between the first lens 81 and the second lens 82 is greater than or equal to 20 mm and less than or equal to 25 mm. That is, the distance between the surface 102 of the first lens 81 away from the phosphor 7 and the surface 103 of the second lens 82 facing the phosphor 7 is greater than or equal to 20 mm and less than or equal to 25 mm.

[0047] For example, along the optical axis, the distance between the first lens 81 and the phosphor 7 is greater than or equal to 1.5 mm and less than or equal to 3.5 mm, that is, the distance between the surface 101 of the first lens 81 facing the phosphor 7 and the surface of the phosphor 7 facing the first lens 81 is greater than or equal to 1.5 mm and less than or equal to 3.5 mm.

[0048] For example, refer to Figure 5The thickness of the first lens 81 can range from 8.3 mm to 9.8 mm, and its refractive index can range from 1.66 to 1.71. The thickness of the second lens 82 can range from 8 mm to 11.2 mm, and its refractive index can range from 1.78 to 1.83. The thickness of the third lens 83 can range from 3 mm to 5.7 mm, and its refractive index can range from 1.82 to 1.85. The thickness of the fourth lens 84 can range from 21 mm to 23.5 mm, and its refractive index can range from 1.70 to 1.77. These numerical ranges include endpoint values. For example, the thickness of the first lens 81 can be in the range of 8.3mm - 9.8mm, that is, the thickness of the first lens is greater than or equal to 8.3mm and less than or equal to 9.8mm; the refractive index of the first lens 81 can be in the range of 1.66-1.71, that is, the refractive index of the first lens 81 is greater than or equal to 1.66 and less than or equal to 1.71.

[0049] For example, refer to Figure 5 The radius of curvature of the surface 102 of the first lens 81, which is away from (i.e., opposite to) the phosphor 7, ranges from 14.3 mm to 21.2 mm. The radius of curvature of the surface 105 of the third lens 83, which faces the phosphor 7, ranges from infinity. The radius of curvature 106 of the surface of the third lens 83, which is away from (i.e., opposite to) the phosphor 7, ranges from -63.3 mm to -55.6 mm. The radius of curvature of the surface 107 of the fourth lens 84, which is away from (i.e., opposite to) the phosphor 7, ranges from 55.8 mm to 64.5 mm.

[0050] For example, the Abbe number of the second lens 82 is in the range of 30-37.

[0051] For example, the material of the first lens 81 can be HLAK51, the material of the second lens 82 can be HZLAF56B, the material of the third lens 83 can be HZF52, and the material of the fourth lens 84 can be HLAK7A.

[0052] It should be noted that the high beam lens assembly 8 of the present invention differs from the lens assemblies in existing motor vehicle headlights. In existing motor vehicle headlight lens assemblies, the lens assembly is used to achieve a non-imaging effect of light, that is, the design concept is an illumination design, only considering the field of view angle of the projected light, without resolution, and cannot distinguish the scanning area on the phosphor 7. In this application, the high beam lens assembly 8 is designed for zoned scanning and zoned illumination, and the design concept is an imaging design with a certain resolution, which can distinguish the scanning area on the phosphor 7. After passing through the high beam lens assembly 8, the scanning area on the phosphor 7 is presented in the illumination area, thereby achieving zoned illumination. In addition, compared with other aspherical design solutions, the high beam lens assembly of the present invention uses 4 spherical lenses, which is easier to manufacture and has a lower cost. The above parameter configuration of the high beam lens assembly makes the structure of the high beam lens assembly 8 itself and its combination structure with the phosphor 7 more compact, and makes the zoned scanning and illumination boundaries of the motor vehicle headlight clearer.

[0053] Next, refer to Figure 1 The motor vehicle headlight also includes a beam shaping lens 3, a first reflector 4, a second reflector 6, a light-emitting diode 9, and a low beam lens 10. The blue laser emitted by the blue laser 2 is focused by the beam shaping lens 3 and projected onto the first reflector 4. The first reflector 4 reflects the blue laser light onto a scanning galvanometer 5, which vibrates and scans the blue laser light to the second reflector 6. The second reflector 6 then reflects the blue laser light onto a preset area of ​​the phosphor 7. The preset area on the phosphor 7 is irradiated by the blue laser and emits white light, which is projected onto either the low beam or high beam area. The light emitted by the light-emitting diode 9 is projected onto the low beam area by the low beam lens 10.

[0054] For example, when the vehicle headlights are in low beam mode, LED 9 emits light, and the light emitted by LED 9 is projected onto the low beam area through the low beam lens 10. When the vehicle headlights are in high beam mode, LED 9 emits light, and the light emitted by LED 9 is projected onto the high beam area, specifically the area closer to the vehicle, through the low beam lens 10.

[0055] For example, blue laser 2 refers to a laser with a wavelength in the range of 400nm-500nm and a blue light source. The blue laser emitted by blue laser 2 has the characteristics of short wavelength, small diffraction effect and high energy.

[0056] For example, phosphor 7 is a material that produces cold light emission, including phosphorescent materials with slow brightness decay and fluorescent materials with light emission decay in tens of nanoseconds. Phosphor 7 can be located in the blue laser emission path emitted by blue laser 2. For example, phosphor 7 can be understood as a light conversion mechanism that can convert light of one wavelength into light of another wavelength. In this embodiment of the invention, the area of ​​phosphor 7 irradiated by blue laser emits white light, that is, blue light is converted into white light.

[0057] For example, the control system 1 is used to control the surface vibration of the scanning mirror 5 for scanning and can control the output power of the emitted laser.

[0058] For example, the scanning galvanometer 5 is a micro-electromechanical system, with a size less than or equal to millimeters, and its driving methods include four types: electrothermal drive, electrostatic drive, electromagnetic drive, and piezoelectric drive. For example, the scanning galvanometer 5 can be a miniature drivable mirror fabricated based on micro-electro-mechanical system (MEMS) technology.

[0059] Figure 6 This is a simulation diagram of the low beam illumination mode of a motor vehicle headlight provided in an embodiment of the present invention, in conjunction with reference to the following. Figure 2 and Figure 6 When the vehicle's headlights are switched to low beam mode, the upper half of the phosphor 7 emits white light. This white light, after being imaged by the high beam lens assembly 8, forms a white beam on the headlights. Figure 6 The lighting beam is positioned low in the middle, meaning it forms a lighting beam that is relatively close to the vehicle.

[0060] Figure 7 This is a simulation diagram of the high beam illumination mode of a motor vehicle headlight provided in an embodiment of the present invention, for reference. Figure 7 When the vehicle's headlights are switched to high beam mode, the entire area of ​​phosphor 7 emits white light. The white light emitted by the upper part of phosphor 7 is imaged by the high beam lens assembly 8 and formed on... Figure 7 The lower part of the illumination beam is positioned to create a beam of light that is relatively close to the vehicle. The white light generated by the lower half of the phosphor 7 is imaged by the high beam lens assembly 8 and then formed on the... Figure 7 The lighting beam is positioned relatively high in the center, meaning it forms a lighting beam that is relatively far from the vehicle. Figure 6 and Figure 7 The image was taken 15 meters in front of the headlights of a motor vehicle.

[0061] For example, Figure 6 and Figure 7 The parameters of the high beam lens group used are shown in Table 1 below.

[0062] Table 1. First design values ​​for the high beam lens assembly provided in the embodiments of the present invention.

[0063]

[0064] Table 1 shows a first design value for the high beam lens assembly provided in an embodiment of the present invention. The specific values ​​can be adjusted according to product requirements and are not intended to limit the invention. The high beam lens assembly shown in Table 1 can be located as follows: Figure 6 and Figure 7 The corresponding motor vehicle headlights. (Refer to reference) Figure 5 A lens generally consists of two surfaces, each serving as a refractive surface. The "Surface" column in Table 1 is numbered according to the surfaces of each lens. Specifically, "101" in the "Surface" column represents the front surface of the first lens 81 (the surface facing the phosphor 7), "102" represents the rear surface of the first lens 81 (the surface away from the phosphor 7), and so on. "103, 104, 105, 106, and 107" represent the front surface of the second lens 82, the rear surface of the second lens 82, the front surface of the third lens 83, the rear surface of the third lens 83 (or the front surface of the fourth lens 84), and the rear surface of the fourth lens 84, respectively. The rear surface of the third lens 83 has the same surface shape as the front surface of the fourth lens 84 and is cemented together. An aperture stop can be installed on the rear surface 107 of the fourth lens 84. The radius of curvature represents the degree of curvature of the lens surface. A positive radius of curvature value indicates that the center of curvature is on the side of the surface closer to phosphor 7, while a negative radius of curvature value indicates that the center of curvature is on the side of the surface farther from phosphor 7. "∞" in the "Radius of Curvature" column represents infinity. The value in the "Spacing" column represents the axial distance between the current surface and the next surface. The "Refractive Index" column represents the refractive index of the medium between the current surface and the next surface. A blank space in the "Refractive Index" column represents the refractive index of air, which is 1. The Abbe number represents the dispersion characteristics of light by the material between the current surface and the next surface; a blank space indicates that the current location is air.

[0065] In the first design value of the high beam lens group shown in Table 1, the focal length f of the high beam lens group 8 satisfies: f = 35.7 mm.

[0066] Figure 8 This is a simulation diagram of the motor vehicle headlights activating zoned lighting mode according to an embodiment of the present invention, in conjunction with reference. Figure 3 and Figure 8 When the vehicle's headlights activate the zoned lighting mode, at least one of the multiple horizontally arranged zones is designated as an area unaffected by blue laser illumination. The white light emitted by the third zone S3 and the fourth zone S4, which are illuminated by the blue laser, is imaged by the high beam lens group 8 and forms a pattern on... Figure 8 Two separate light spots are used, and the scanning area on the phosphor 7 is presented in the illumination area, thereby enabling regional illumination.

[0067] For example, Figure 8 The parameters of the high beam lens group used are shown in Table 2 below.

[0068] Table 2. Second design values ​​for the high beam lens assembly provided in the embodiments of the present invention.

[0069]

[0070] Table 2 shows a second design value for the high beam lens assembly provided in the embodiments of the present invention. The specific values ​​can be adjusted according to product requirements and are not intended to limit the invention. The high beam lens assemblies shown in Table 2 can be located as follows: Figure 8 The corresponding motor vehicle headlights. Any points that overlap with or are similar to those in Table 1 will not be repeated here.

[0071] In the second design value of the high beam lens group shown in Table 2, the focal length f of the high beam lens group 8 satisfies: f = 37.3 mm.

[0072] Figure 9 This is a simulation of the zone lighting mode using the lens assembly in an existing motor vehicle headlight, with reference to... Figure 9 , will be Figure 1 The image obtained by replacing the high beam lens group 8 in the shown motor vehicle headlight with the existing lens group in the motor vehicle headlight is as follows. Figure 9 As shown. Due to the use of a non-imaging lens, the preset areas (third area S3 and fifth area S5) on the phosphor 7 cannot be fully displayed; only two blurry spots appear. The scanning area on the phosphor 7 is not displayed in the illumination area, making it impossible to achieve regional illumination.

[0073] Figure 10 This is a simulation diagram of the image projection mode of a motor vehicle headlight being turned on, provided in an embodiment of the present invention, in conjunction with reference. Figure 4 and Figure 10 A blue laser is projected onto the area where traffic sign B is located, exciting it to form white light. This white light is then imaged by the high beam lens assembly 8, forming... Figure 10 The illuminated beams provide a warning function for traffic indication.

[0074] For example, Figure 10 The parameters of the high beam lens group used are shown in Table 3 below.

[0075] Table 3. Third design values ​​for the high beam lens assembly provided in the embodiments of the present invention.

[0076]

[0077] Table 3 shows a third design value for the high beam lens assembly provided in the embodiments of the present invention. The specific values ​​can be adjusted according to product requirements and are not intended to limit the invention. The high beam lens assembly shown in Table 3 can be located as follows: Figure 10 The corresponding motor vehicle headlights. Any points that overlap with or are similar to those in Table 1 will not be repeated here.

[0078] In the third design value of the high beam lens group shown in Table 3, the focal length f of the high beam lens group 8 satisfies: f = 38.6 mm.

[0079] It should be understood that the aforementioned parameter design values ​​for the three types of high beam lens assemblies are only intended to demonstrate various configurations of high beam lens assemblies, and do not limit any particular design value to a specific lighting mode (high beam illumination, low beam illumination, zone illumination) or projection mode. For example, the first design value for the high beam lens assembly shown in Table 1 can also be applied to... Figure 8 Zone lighting modes or Figure 10 The projection pattern shown, and the second design value for the high beam lens assembly shown in Table 2, can also be applied to... Figure 6 and Figure 7 The low beam and high beam lighting modes or applications in Figure 10 The projection mode shown, and the third design value of the high beam lens assembly shown in Table 3, can also be applied to... Figure 6 and 7 The low beam and high beam lighting modes or applications in Figure 8 The zonal lighting pattern is shown.

[0080] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A motor vehicle headlight, characterized in that, include: Blue laser, emits blue laser light; A phosphor is located in the emission path of the blue laser, and the area of ​​the phosphor irradiated by the blue laser emits white light. The high beam lens assembly is located in the emission path of the phosphor and projects the white light emitted by the phosphor into the low beam area or the high beam area. The system and the scanning galvanometer, under the control of the system, the scanning galvanometer vibrates and scans the blue laser to a preset area of ​​the phosphor. The high beam lens assembly includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis. Only the above four lenses have optical refractive power in the high beam lens assembly. The first lens, the second lens, the third lens, and the fourth lens are all spherical lenses. The first lens is located between the second lens and the phosphor; The first and second lenses are both concave-convex lenses, the third lens is a plano-concave lens, and the fourth lens is a biconvex lens. The surface of the concave-convex lens facing the phosphor is concave, and the surface facing away from the phosphor is convex. The surface of the plano-concave lens facing the phosphor is planar, and the surface facing away from the phosphor is concave. The surface of the biconvex lens facing the phosphor is convex, and the surface facing away from the phosphor is convex. The first, second, and third lenses all have negative optical power, and the fourth lens has positive optical power. Along the optical axis, the distance between the second lens and the third lens is greater than or equal to 0.1 mm and less than or equal to 2 mm; along the optical axis, the distance between the first lens and the second lens is greater than or equal to 20 mm and less than or equal to 25 mm; the third lens and the fourth lens are cemented together to form a cemented lens group.

2. The motor vehicle headlight according to claim 1, characterized in that, The preset region includes the entire region of the phosphor.

3. The motor vehicle headlight according to claim 1, characterized in that, The phosphor includes a first region and a second region arranged in a vertical direction, wherein the first region is located on one side of the second region along the vertical direction; The preset area includes the first area.

4. The motor vehicle headlight according to claim 3, characterized in that, The first region includes a first sub-region and a second sub-region arranged in a horizontal direction, the second sub-region being located on one side of the first sub-region along the horizontal direction, and the width of the first sub-region along the vertical direction being greater than the width of the second sub-region along the vertical direction. The first sub-region and the second sub-region form a missing corner region. The missing corner region is located within the second region and is a region in the phosphor that is not irradiated by blue laser. The position corresponding to the missing corner region will not generate white light, thus limiting the angle of the light emitted by the vehicle headlights that illuminates the oncoming lane.

5. The motor vehicle headlight according to claim 1, characterized in that, The phosphor includes a third region, a fourth region, and a fifth region arranged in a horizontal direction, with the fourth region located between the third region and the fifth region; The preset area includes the third area and the fifth area; The fourth region refers to the area corresponding to the pedestrian when the motor vehicle encounters the pedestrian during nighttime driving. The control system acquires the area where the pedestrian is detected by the on-board sensor and controls the scanning galvanometer not to scan the fourth region.

6. The motor vehicle headlight according to claim 1, characterized in that, The preset area includes traffic signs.

7. The motor vehicle headlight according to claim 1, characterized in that, Along the optical axis, the distance between the first lens and the phosphor is greater than or equal to 1.5 mm and less than or equal to 3.5 mm.

8. The motor vehicle headlight according to claim 1, characterized in that, It also includes a beam-shaping lens, a first reflector, a second reflector, a light-emitting diode, and a low-beam lens; The blue laser emitted by the blue laser is focused by the beam shaping lens and projected onto the first reflector. The first reflector reflects the blue laser to the scanning galvanometer, which vibrates and scans the blue laser to the second reflector. The second reflector then reflects the blue laser to a preset area of ​​the phosphor. The light emitted by the light-emitting diode is projected onto the low beam area through the low beam lens.

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