Ultrathin automobile headlamp extended projection optical system lens assembly, device, system and imaging control method

Abstract

The invention discloses an ultra-thin automobile headlamp extended projection optical system lens assembly, device and system and an imaging control method. An extended projection automobile lamp has extremely high universality, and through design of a light guide structure and an imaging structure, the light guide structure is independently designed to adapt to different automobile types; an imaging light path of the system is of a periscopic structure, through the design of a turn-back light path, the total light path can be effectively shortened, the size of the whole system is reduced, the occupied space of a vehicle lamp is reduced, and a larger installation space is provided for other elements. The projection car lamp system has good projection quality and clear pictures, and 0.5 m < 2 > patterns can be projected at the position of 2 m; according to the projection system, the Micro LED is selected as a light source, so that the projection system has higher luminous efficiency and lower propagation loss; and in cooperation with the main lamp, complex multi-dimensional projection display can be achieved, and the man-machine interaction capacity is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile lamps, and more specifically, relates to an ultra-thin automobile headlight extended projection optical system lens assembly, device, system, and imaging control method. Background Art

[0002] With the booming development of the automotive industry, consumers' aesthetic and functional demands for cars are constantly evolving. As an important part of the appearance and function of cars, the development history of car headlight decorative lights has attracted much attention. Users are increasingly pursuing the personalization and aesthetics of vehicles, and at the same time have higher expectations for the safety and functionality of car lights.

[0003] Car headlight decorative lights first entered the market as purely decorative lights, mainly used to meet the needs of car owners to show their unique taste and enhance the recognition of the vehicle's appearance. They are often used as personalized embellishments, installed on the edge or inside of the headlights, with unique shapes, colors or lighting effects, making the vehicle stand out from the crowd of traffic, and becoming a symbol of the owner's personality.

[0004] However, with the rapid development of automobile technology, especially the rapid development of optical technology, electronic technology and intelligent control technology, automobile headlight decorative lights are no longer limited to decorative functions. The emergence of intelligent projection lights has expanded the functionality of headlights, but the projection structure is often large in size and difficult to integrate into the decorative lights, and LED decorative lights lack some functionality. Summary of the invention

[0005] The invention provides an ultra-thin automobile headlight extended projection optical system, which is used to solve the existing problems that LED decorative lights are insufficient in functionality and occupy more system space.

[0006] In order to achieve the above-mentioned invention object, an ultra-thin automotive headlight extended projection optical system is provided, the system comprising: a power control system, an optical system lens assembly, and a mechanical packaging assembly. The power control system comprises a MicroLED driving circuit and an image generator. The optical system lens assembly comprises a light guide lens group and an imaging lens group.

[0007] The light-guiding lens group includes: a first lens, a first reflector, a second lens, and a second reflector.

[0008] The imaging lens group includes: a third lens, a third reflector, a fourth reflector, and a fourth lens. The first lens serves as the aperture stop of the system, the first reflector is a first eccentric mirror, the second reflector is a second eccentric mirror, the third reflector is a third eccentric mirror, and the fourth reflector is a fourth eccentric mirror.

[0009] The mechanical packaging component of the projection system uses high temperature resistant nylon as the packaging shell, as shown in the attachedFigure 1 As shown, laser welding is used to determine the relative position of each lens. The relative position of each lens is:

[0010] The distance between the first lens and the first reflector is 10 mm, the distance between the first reflector and the second lens is 25 mm, the distance between the second lens and the second reflector is 35 mm, the distance between the second reflector and the third lens is 10 mm, the distance between the third lens and the third reflector is 10 mm, the distance between the third reflector and the fourth reflector is 10 mm, the distance between the fourth reflector and the fourth lens is 10 mm, and the end of the lens barrel is fixed with butyl rubber.

[0011] In the light guide structure, there are toothed extinction structures in the lens barrel wall, and the relationship between the number n of toothed extinction structures and the distance L2 between the first reflector and the second reflector and the thickness D2 of the second lens is n=(L2-D2) / 0.0587.

[0012] The center thickness of each lens is:

[0013] The center thickness of the first lens D1 = 3.433mm,

[0014] The center thickness of the second lens D2 = 3.025mm,

[0015] The center thickness of the third lens D3 = 1.861mm,

[0016] The central thickness of the fourth lens is D4=0.529 mm.

[0017] The reflection angle and reflectivity of each reflector are:

[0018] The reflection angle of the first reflector is 180 degrees, and the reflectivity is 92%;

[0019] The reflection angle of the second reflector is 180 degrees, and the reflectivity is 92%;

[0020] The reflection angle of the third reflector is 180 degrees, and the reflectivity is 92%.

[0021] The reflection angle of the fourth reflector is 180 degrees, and the reflectivity is 92%.

[0022] The eccentric position, eccentric angle and eccentric type of each lens of the present invention are:

[0023] The mirror eccentricity angle is 45 degrees, and the type is eccentric and curved;

[0024] The mirror eccentricity angle is -45 degrees, and the type is eccentric and curved;

[0025] The eccentricity along the negative direction of the y-axis is 6mm, and the type is basic eccentricity;

[0026] The mirror eccentricity angle is 10 degrees, and the type is eccentric and regressive;

[0027] The mirror eccentricity angle is 45 degrees, and the type is eccentric and regressive.

[0028] The present invention involves the return light path, and the lenses will partially overlap, so the light-through and light-blocking apertures are set:

[0029] The central light blocking radius of the third reflector is 3mm;

[0030] Considering the ultra-thin design, the third lens, the third reflector, the fourth reflector and the fourth lens only install the upper half of the lens that effectively transmits light, and the lower half of the lens does not need to be processed and installed.

[0031] The refractive index and dispersion coefficient of each lens are:

[0032] The refractive index of the first lens is n1=1.73, and the dispersion coefficient is V1=34.5;

[0033] The refractive index of the second lens is n2 = 1.61, and the dispersion coefficient is V2 = 37.2;

[0034] The refractive index of the third lens is n3 = 1.48, and the dispersion coefficient is V3 = 70.4;

[0035] The refractive index of the fourth lens is n4=1.61, and the dispersion coefficient is V4=41.3.

[0036] The object-side curvature radius and image-side curvature radius of each lens are:

[0037] The object curvature radius of the first lens is R1 = -170.256 mm, and the image curvature radius is R2 = -7.639 mm;

[0038] The object curvature radius of the second lens is R3 = 8.197 mm, and the image curvature radius is R4 = 7.644 mm;

[0039] The object curvature radius of the third lens is R5 = -145.855 mm, and the image curvature radius is R6 = -97.8811 mm;

[0040] The object curvature radius of the fourth lens is R7 = -4.3626 mm, and the image surface curvature radius is R8 = -3.972 mm;

[0041] The radius of curvature of each reflector is:

[0042] The radius of curvature of the first reflector is R9 = 10627.126 mm;

[0043] The radius of curvature of the second reflector is R10 = 4171.825 mm;

[0044] The radius of curvature of the third reflector is R11 = -39.349 mm;

[0045] The radius of curvature of the fourth reflector is R12 = -97.881 mm.

[0046] Furthermore, the power control system provides adaptive electric energy, the capacitor is connected in parallel at both ends of the power supply, the current limiting resistor is connected in series in the circuit, the MOSFET gate is connected to the PWM controller, the PWM controller outputs pulse signals with different duty cycles to control the on and off time of the MOSFET, the Zener diode is connected in reverse parallel with the MICRO LED, and the current sensor is connected in series in the circuit to monitor the current in real time and feed back to the PWM controller.

[0047] The on-board intelligent assisted driving system sends data to the image generator, which then transmits the data electrical signal to the Micro LED driving circuit, and the Micro LED component unit projects the corresponding pattern.

[0048] Furthermore, the working method of the projection optical system is: when the power control system turns on the Micro LED power switch, light is emitted from the Micro LED component, the optical system obtains edge light, passes through the first lens in sequence, reaches the first reflector, the first reflector reflects the image to the second lens, and then reaches the second reflector, the second reflector reflects the light to the third lens, reaches the third reflector, the third reflector reflects the image to the fourth reflector, and then the fourth reflector reflects the image to the fourth lens, and the fourth lens images the image on the ground 2m away.

[0049] Beneficial effects of the present invention:

[0050] 1. This system has extremely high versatility. Through the design of the light guide structure, a hole is opened on the side of the main light, and the extended projection component is connected. It can be applied to different car models and realize the intelligent transformation of LED decorative lights.

[0051] 2. The imaging lens of the projection system adopts a periscope lens design, which realizes an ultra-thin system design by folding the optical path to ensure that the imaging quality and optical path length remain unchanged.

[0052] 3. In addition to the headlight projection information, the system has a new projection unit to provide multiple information guidance, enhance human-computer interaction, and adapt to the trend of diversified intelligence.

[0053] 4. Different from traditional LED decorative lights, this system is integrated with the main light and uses the same light source as the main light. It uses the edge light of the main light to achieve re-projection, making full use of the light source to convey information, reducing the overall size of the headlight and reducing manufacturing costs.

[0054] 5. This system does not use the method of modulating the projection of LED light source through the DMD reflector, but uses the method of direct projection of MicroLED light source and direct emission through the lens, which has higher light transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a schematic diagram of the entire extended projection system structure.

[0056] Figure 2 This is a schematic diagram of the integrated package of projection headlights

[0057] Figure 3 This is the mechanical design drawing of the light guide structure

[0058] Figure 4 This is the optical path diagram of the extended projection system

[0059] Figure 5 This is the schematic diagram of Micro LED driving circuit

[0060] Figure 6 This is the schematic diagram of Micro LED driving circuit

[0061] Figure 7 is the MTF diagram of the projection system

[0062] Figure 8 is the spot diagram of the projection system

[0063] Fig. 9 is the ray aberration diagram of the projection system

[0064] Fig.10 This is the OPD aberration curve of the projection system.

[0065] Figure 1 Marked as: Micro LED driving circuit 1, Micro LED lamp group 2, first lens 3, first reflector 4, second lens 5, second reflector 6, third lens 7, third reflector 8, fourth reflector 9, fourth lens 10, serrated extinction structure 11. DETAILED DESCRIPTION

[0066] The present invention will be further described below in conjunction with the accompanying drawings.

[0067] As attached Figure 1-4 As shown, the present invention provides an ultra-thin automobile headlight extended projection optical system, the automobile headlight projection system comprises: a power control system, an optical system lens assembly, and a mechanical packaging assembly;

[0068] Among them: power control system, such as Figure 5-6As shown, it contains a Micro LED driving circuit, in which the power supply provides adaptive electric energy to the circuit and transmits it to each component through the connection. The capacitor is connected in parallel at both ends of the power supply to smooth the power supply voltage, reduce fluctuations and ripples, and provide stable input for subsequent circuits. The current limiting resistor is connected in series in the circuit to limit the current passing through the Micro LED according to Ohm's law to prevent it from being damaged by excessive current. MOSFET is used as a switching element, and its gate is connected to the PWM controller. The PWM controller outputs pulse signals with different duty cycles to control the on and off time of the MOSFET, thereby adjusting the average current and luminous brightness of the Micro LED. The Zener diode is connected in reverse parallel to the Micro LED, which is cut off when normal, and is turned on when reverse voltage appears and reaches the breakdown voltage, discharging the reverse voltage to protect the Micro LED. The current sensor is connected in series in the circuit to monitor the current in real time and feed it back to the PWM controller. The PWM controller compares the feedback current with the target value. If there is a deviation, it automatically adjusts the duty cycle of the pulse signal to stabilize the current and ensure that the luminous brightness is not affected by power supply voltage fluctuations and component parameter changes. The entire driving circuit realizes stable power supply, flexible dimming and effective protection for the Micro LED, ensuring that it can emit light reliably under different working conditions.

[0069] like Figure 2 , 3 As shown, the mechanical packaging assembly of the projection system uses high temperature resistant nylon as the packaging shell, laser welding is used to determine the relative position between each lens, and the end of the lens barrel is fixed with butyl rubber.

[0070] The following is a detailed description of the lens components:

[0071] The optical system lens assembly includes a light guide lens group and an imaging lens group.

[0072] The light guide lens group includes: a first lens 3 , a first reflector 4 , a second lens 5 , and a second reflector 6 .

[0073] The imaging lens group includes: a third lens 7, a third reflecting mirror 8, a fourth reflecting mirror 9, and a fourth lens 10.

[0074] The first lens 3 serves as an aperture stop of the system, the first reflector is a first eccentric mirror, the second reflector is a second eccentric mirror, the third reflector is a third eccentric mirror, and the fourth reflector is a fourth eccentric mirror.

[0075] The relative positions of the lenses are:

[0076] like Figure 1As shown, the distance between the first lens 3 and the first reflector 4 is 10 mm, the distance between the first reflector 4 and the second lens 5 is 25 mm, the distance between the second lens 5 and the second reflector 6 is 35 mm, the distance between the second reflector 6 and the third lens 7 is 10 mm, the distance between the third lens 7 and the third reflector 8 is 10 mm, the distance between the third reflector 8 and the fourth reflector 9 is 10 mm, and the distance between the fourth reflector 9 and the fourth lens 10 is 10 mm.

[0077] In the light guide structure, there are toothed extinction structures in the lens barrel wall, and the relationship between the number n of toothed extinction structures and the distance L2 between the first reflector 4 and the second reflector 6 and the second lens thickness D2 is n=(L2-D2) / 0.0587.

[0078] The center thickness of each lens is:

[0079] The center thickness of the first lens D1 = 3.433mm,

[0080] The center thickness of the second lens D2 = 3.025mm,

[0081] The center thickness of the third lens D3 = 1.861mm,

[0082] The central thickness of the fourth lens is D4=0.529 mm.

[0083] The reflection angle and reflectivity of each reflector are:

[0084] The reflection angle of the first reflector is 180 degrees, and the reflectivity is 92%;

[0085] The reflection angle of the second reflector is 180 degrees, and the reflectivity is 92%;

[0086] The reflection angle of the third reflector is 180 degrees, and the reflectivity is 92%.

[0087] The reflection angle of the fourth reflector is 180 degrees, and the reflectivity is 92%.

[0088] The present invention relates to an eccentric system. In order to make the description more complete and clear, the centering system and the eccentric system are specially introduced here. In the centering system, the axes of each local surface coordinate system coincide with the optical axis and the mechanical axis of the entire system. +Y is selected as "up" to form a right-handed coordinate system with +X. The +Z axis points from the object to the image. Each surface is always centered in its local coordinate system. If you want to leave the centering system, you can do so by specifying a breakpoint in the coordinates, that is, specifying the position and direction of each local coordinate system relative to the previous surface coordinate system. Therefore, when it is said that a surface is tilted or eccentric, it really means that its coordinate system is tilted or eccentric relative to the previous surface. There are many types of eccentricity, and the present invention mainly has three types of eccentricity: 1. Basic eccentricity is defined as: the default eccentricity and tilt provide a coordinate breakpoint on the surface. The coordinate breakpoint is formed by the surface defined in the new coordinate system before refraction / reflection. Then, the local coordinate systems of all subsequent surfaces are aligned with the new coordinate system and separated by the thickness values ​​measured along the local Z axis (until another breakpoint appears). 2. Decentering and bending are defined as: Mainly used for reflectors. It automatically adds an additional tilt set to rotate the final coordinate system to track the main ray. 3. Decentering and regression are defined as: Coordinate breakpoints are provided only for the specified surface. The surface is decentered and tilted before calculating the ray intersection and refraction, and then the coordinate system is restored after refraction. All surfaces after this surface are defined in the initial coordinate system. It can be regarded as a temporary tilt. The rule for angular decentering is that clockwise rotation is negative angle and counterclockwise rotation is positive angle.

[0089] The eccentric position, eccentric angle and eccentric type of each lens of the present invention are:

[0090] The mirror eccentricity angle is 45 degrees, and the type is eccentric and curved;

[0091] The mirror eccentricity angle is -45 degrees, and the type is eccentric and curved;

[0092] The eccentricity along the negative direction of the y-axis is 6mm, and the type is basic eccentricity;

[0093] The mirror eccentricity angle is 10 degrees, and the type is eccentric and regressive;

[0094] The mirror eccentricity angle is 45 degrees, and the type is eccentric and regressive.

[0095] The present invention involves the return light path, and the lenses will partially overlap, so the light-through and light-blocking apertures are set:

[0096] The central light blocking radius of the third reflector is 3mm;

[0097] Considering the ultra-thin design, the third lens, the third reflector, the fourth reflector and the fourth lens only install the upper half of the lens that effectively transmits light, and the lower half of the lens does not need to be processed and installed.

[0098] The refractive index and dispersion coefficient of each lens are:

[0099] The refractive index of the first lens is n1=1.73, and the dispersion coefficient is V1=34.5;

[0100] The refractive index of the second lens is n2 = 1.61, and the dispersion coefficient is V2 = 37.2;

[0101] The refractive index of the third lens is n3 = 1.48, and the dispersion coefficient is V3 = 70.4;

[0102] The refractive index of the fourth lens is n4=1.61, and the dispersion coefficient is V4=41.3.

[0103] The object-side curvature radius and image-side curvature radius of each lens are:

[0104] The object curvature radius of the first lens is R1 = -170.256 mm, and the image surface curvature radius is R2 = -7.639 mm; the object curvature radius of the second lens is R3 = 8.197 mm, and the image surface curvature radius is R4 = 7.644 mm;

[0105] The object curvature radius of the third lens is R5 = -145.855, and the image surface curvature radius is R6 = -97.8811mm; the object curvature radius of the fourth lens is R7 = -4.3626mm, and the image surface curvature radius is R8 = -3.972mm; the curvature radius of each reflector is:

[0106] The radius of curvature of the first reflector is R9 = 10627.126 mm;

[0107] The radius of curvature of the second reflector is R10 = 4171.825 mm;

[0108] The radius of curvature of the third reflector is R11 = -39.349 mm;

[0109] The radius of curvature of the fourth reflector is R12 = -97.881 mm.

[0110] The specific parameters of the optical system are shown in Table 1:

[0111] Table 1

[0112]

[0113]

[0114] The aspheric formula is:

[0115]

[0116] in,

[0117] z: Depth of the aspheric surface

[0118] r: Distance from optical axis to lens surface (height) (mm)

[0119] K: Eccentricity

[0120] c: paraxial curvature

[0121] A, B, C, D...: 4th, 6th, 8th, 10th... order aspheric coefficients. The aspheric parameters of the lens of this optical system are as shown in Table 2:

[0122] Table 2

[0123]

[0124]

[0125] The method of using the ultra-thin automobile headlight extended projection optical imaging system is as follows: Figure 2 As shown, the left figure is an existing automobile headlight structure, and the right figure is a schematic diagram of an automobile headlight structure with an extended projection optical imaging system device of the present invention installed. The extended projection optical system device of the present invention is installed at the bottom of the existing automobile headlight to obtain the bottom edge light of the Micro LED, and guide the light out from the Micro LED lamp group of the main lamp through the first lens and the first reflector, as shown in FIG. Figure 3 As shown, the light guide structure is locked to the main light structure by four M6 screws, and its length can be adjusted according to the distance between the main light and the decorative light. The imaging structure is linked to the light guide structure by laser welding, leaving space for thermal expansion.

[0126] The working principle and process of the ultra-thin car headlight extended projection optical imaging system are as follows: when the power control system turns on the Micro LED power switch, the on-board intelligent assisted driving system sends data to the image generator, and the image generator then transmits the data electrical signal to the Micro LED driving circuit 1, driving the Micro LED light group 2 to project the corresponding pattern of light. After the light is emitted from the Micro LED component, the optical system obtains the edge light, passes through the first lens in turn, and reaches the first reflector. The first reflector reflects the image to the second lens, and then reaches the second reflector. The second reflector reflects the light to the third lens, reaches the third reflector, and the reflector reflects the image to the fourth reflector. The reflector reflects the image to the fourth lens, and the fourth lens forms an image on the ground 2m away. The optical path diagram is shown in the figure. Figure 4 shown.

[0127] The projection effect of this system is excellent. The imaging effect of the lens is analyzed below:

[0128] MTF describes the ability of an optical system to accurately transfer the different spatial frequency components of the target object to the image plane. The MTF value ranges from 0 to 1. The closer the value is to 1, the better the optical system transfers the spatial frequency, that is, it can truly reproduce the details of the object. The MTF of this lens is as follows Figure 7 As shown, it has a higher resolution.

[0129] The spot diagram refers to the collection of points formed on the image plane by a large number of light rays emitted by an object point after passing through an optical system. Ideally, the light rays emitted by an object point should converge at the same point on the image plane after passing through a perfect optical system. However, in reality, due to factors such as aberrations, the light rays will be scattered in a certain area of ​​the image plane to form a spot diagram. The shape and distribution of the spot diagram can intuitively reflect the type and degree of aberration of the optical system.

[0130] The spot diagram of this lens is shown below: Figure 8 As shown, the root mean square radius values ​​RMS are 0.152252mm, 0.067196mm, and 0.052161mm respectively, which have a relatively high contrast.

[0131] Aberration is the deviation between the actual light and the ideal light propagation path, which directly affects the imaging quality of the optical system. The light aberration diagram intuitively shows the distribution and size of various aberrations, such as spherical aberration, coma, astigmatism, field curvature and distortion. Fig. 9 As shown, the ray aberration value of the system does not exceed 0.5.

[0132] OPD optical path difference can be used to measure the deformation of the wavefront. In an ideal optical system, the optical path of the light emitted from the object point should be equal when it passes through the system and reaches the image point. However, there are aberrations in the actual optical system, which makes the optical path of different light rays different. The OPD aberration diagram is shown in the attached figure. Fig.10 As shown, the OPD aberration value of the system does not exceed 0.05.

[0133] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent methods or changes that do not deviate from the technical creation of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ultra-thin automobile headlight extended projection optical system lens assembly, characterized in that: The optical path includes a light guide lens group and an imaging lens group in sequence; The light guide lens group includes: a first lens, a first reflector, a second lens, and a second reflector. The imaging lens group comprises: a third lens, a third reflecting mirror, a fourth reflecting mirror, and a fourth lens; The first lens serves as an aperture stop of the system, the first reflector is a first eccentric mirror, the second reflector is a second eccentric mirror, the third reflector is a third eccentric mirror, and the fourth reflector is a fourth eccentric mirror. Lens shapes to be added.

2. The ultra-thin automobile headlight extended projection optical system lens assembly according to claim 1, characterized in that: The center thickness of each lens is: The center thickness of the first lens D1 = 3.433mm, The center thickness of the second lens D2 = 3.025mm, The center thickness of the third lens D3 = 1.861mm, The central thickness of the fourth lens is D4=0.529 mm.

3. The ultra-thin automobile headlight extended projection optical system lens assembly according to claim 1, characterized in that: The reflection angle and reflectivity of each reflector are: The reflection angle of the first reflector is 180 degrees, and the reflectivity is 92%; The reflection angle of the second reflector is 180 degrees, and the reflectivity is 92%; The reflection angle of the third reflector is 180 degrees, and the reflectivity is 92%; The reflection angle of the fourth reflector is 180 degrees, and the reflectivity is 92%.

4. The ultra-thin automobile headlight extended projection optical system lens assembly according to claim 3, characterized in that: The eccentric position, eccentric angle and eccentric type of each lens are: The mirror eccentricity angle is 45 degrees, and the type is eccentric and curved; The mirror eccentricity angle is -45 degrees, and the type is eccentric and curved; The eccentricity along the negative direction of the y-axis is 6mm, and the type is basic eccentricity; The mirror eccentricity angle is 10 degrees, and the type is eccentric and regressive; The mirror eccentricity angle is 45 degrees, and the type is eccentric and regressive. The central light blocking radius of the third reflector is 3mm; Considering the ultra-thin design, the third lens, the third reflector, the fourth reflector and the fourth lens only install the upper half of the lens that effectively transmits light, and the lower half of the lens does not need to be processed and installed.

5. The ultra-thin automobile headlight extended projection optical system lens assembly according to claim 1, characterized in that: The refractive index and dispersion coefficient of each lens are: The refractive index of the first lens is n1=1.73, and the dispersion coefficient is V1=34.5; The refractive index of the second lens is n2 = 1.61, and the dispersion coefficient is V2 = 37.2; The refractive index of the third lens is n3 = 1.48, and the dispersion coefficient is V3 = 70.4; The refractive index of the fourth lens is n4=1.61, and the dispersion coefficient is V4=41.

3.

6. The ultra-thin automobile headlight extended projection optical system lens assembly according to claim 1, characterized in that: The object-side curvature radius and image-side curvature radius of each lens are: The object curvature radius of the first lens is R1 = -170.256 mm, and the image curvature radius is R2 = -7.639 mm; The object curvature radius of the second lens is R3 = 8.197 mm, and the image curvature radius is R4 = 7.644 mm; The object curvature radius of the third lens is R5 = -145.855 mm, and the image curvature radius is R6 = -97.8811 mm; The object side curvature radius of the fourth lens is R7=-4.3626 mm, and the image side curvature radius is R8=-3.972 mm.

7. The ultra-thin automobile headlight extended projection optical system lens assembly according to claim 1, characterized in that: The radius of curvature of each reflector is: The radius of curvature of the first reflector is R9 = 10627.126 mm; The radius of curvature of the second reflector is R10 = 4171.825 mm; The radius of curvature of the third reflector is R11 = -39.349 mm; The radius of curvature of the fourth reflector is R12 = -97.881 mm.

8. An ultra-thin automotive headlight extended projection optical system device, characterized in that: The invention comprises the lens assembly as claimed in claim 1 and a mechanical packaging assembly, wherein the mechanical packaging assembly uses high temperature resistant nylon as the outer shell of the packaging lens barrel, and laser welding is used to fix the relative positions of the lenses in the lens assembly, and the relative positions of the lenses are: The distance between the first lens and the first reflector is 10 mm, the distance between the first reflector and the second lens is 25 mm, the distance between the second lens and the second reflector is 35 mm, the distance between the second reflector and the third lens is 10 mm, the distance between the third lens and the third reflector is 10 mm, the distance between the third reflector and the fourth reflector is 10 mm, and the distance between the fourth reflector and the fourth lens is 10 mm. The end of the lens barrel is fixed with butyl rubber packaging; In the light guide structure, a toothed extinction structure is provided in the lens barrel wall, and the relationship between the number n of the toothed extinction structures and the distance L2 between the first reflector and the second reflector and the thickness D2 of the second lens is n=(L2-D2) / 0.0587.

9. An automobile headlight projection system, characterized in that: It comprises the extended projection optical system device as claimed in claim 8 and a power control system; the power control system comprises a Micro LED driving circuit and a Micro LED lamp group, the Micro LED driving circuit is used to adjust the average current and luminous brightness of the Micro LED lamp group; a part of the edge light of the light emitted by the Micro LED lamp group enters the extended projection optical system device as claimed in claim 8, and the output light of the device realizes image formation.

10. The imaging control method of the automobile headlight projection system according to claim 9, characterized in that: When the power control system turns on the Micro LED power switch, the on-board intelligent assisted driving system sends data to the image generator, and the image generator then transmits the data electrical signal to the Micro LED driving circuit, driving the Micro LED light group to project light of the corresponding pattern. After the light is emitted from the Micro LED component, the edge light is obtained by the extended projection optical system device, passes through the first lens in sequence, and reaches the first reflector. The first reflector reflects the image to the second lens, and then reaches the second reflector. The second reflector reflects the light to the third lens, reaches the third reflector, and the reflector reflects the image to the fourth reflector. The reflector reflects the image to the fourth lens, and the fourth lens forms an image on the ground 2m away.

Images