A thick-wall car light guide device

Abstract

The utility model relates to lighting device technical field especially is involved in a kind of thick wall car light light guide device for car, it includes main body light guide layer, front collimating layer, rear refractive layer, edge sealing rib, bottom support pedestal, embedded temperature control flow channel group, exhaust passage network and surface microstructure array;Main body light guide layer is modified transparent polymer thick wall body, front collimating layer is arranged in light entrance end surface for light correction, rear refractive layer is arranged in light exit end surface to realize light intensity distribution regulation and control, bottom support pedestal is built-in reinforcing rib and temperature control flow channel, exhaust passage network is connected with vacuum system to discharge gas, edge sealing rib surrounds circumferential side and is equipped with anti-skid line, light exit surface is covered with microstructure array.The present application can improve optical uniformity and structural stability.

Description

Technical Field

[0001] This utility model relates to the field of lighting device technology, specifically to a thick-walled automotive lamp light guide device. Background Technology

[0002] Thick-walled light guide devices are key optical components in the lighting systems of new energy vehicles. Their thickness is typically no less than 6mm, enabling precise guidance and uniform distribution of light. They play an important role in improving lighting effects, optimizing energy consumption, and enhancing the aesthetics of the vehicle's appearance. As new energy vehicles increasingly demand higher optical performance, energy efficiency control, and long-term reliability from their headlights, thick-walled light guide structures are widely used in core components such as headlights, taillights, and ambient lights due to their excellent light control capabilities. Currently, domestic and foreign companies have conducted numerous studies on the structural design and light efficiency improvement of thick-walled optical components. Some products have achieved high initial light transmittance through material selection and geometric optimization.

[0003] However, in practical applications, existing thick-walled light guide devices still suffer from insufficient light decay control during long-term use. Furthermore, during injection molding, defects such as shrinkage marks, warping, or internal bubbles are easily generated due to uneven cooling rates or residual gas, affecting optical uniformity and structural stability. In addition, traditional light guide structures often use a single optical unit, which has limited ability to control the light path and makes it difficult to meet the comprehensive performance requirements of high light transmission efficiency and low energy consumption. Therefore, their optical performance under complex working conditions still needs further improvement. Utility Model Content

[0004] This utility model provides a thick-walled light guide device for automotive headlights. Addressing the problems of significant light decay after long-term use, shrinkage marks, warping, internal air bubbles, insufficient optical uniformity, poor structural stability, and limited light control capabilities in existing thick-walled light guide structures, which make it difficult to balance light transmission efficiency and energy consumption, this invention proposes a novel physical structure. Through the collaborative design of composite material layering, multi-level segmented light guide path, and a gradient temperature control structure embedded in the molding die along with a gas exhaust channel, it achieves the technical goals of stable optical performance, dense and defect-free structure, improved light energy utilization, and reduced energy consumption.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a thick-walled automotive headlight light guide device, comprising a main light guide layer, a front collimation layer, a rear refractive layer, edge sealing ribs, a bottom support base, an embedded temperature control flow channel assembly, an exhaust channel network, and a surface microstructure array, wherein: The main light guide layer is a transparent polymer solid with a thickness between six and twenty millimeters. Its material is polycarbonate or polymethyl methacrylate modified with anti-aging agents and light stabilizers. This layer occupies the main part of the overall volume of the device and undertakes the basic light transmission function. The pre-collimation layer is attached to the light-incident end face of the main light guide layer. It consists of multiple parallel prismatic protrusions. Each prism extends along the incident direction of the light. The cross-section of the prism is trapezoidal. Its inclined angle is calculated and set according to the divergence angle of the light source. It is used to perform primary convergence and direction correction of the initial incident light. The rear refractive layer is set on the outer side of the light-emitting end face of the main light guide layer. It consists of multiple asymmetrically distributed arc-shaped grooves. The groove depth decreases from the center to the edge. The radius of curvature of the arc surface is parametrically designed according to the required light emission angle distribution, so that the light is deflected twice through the groove interface after passing through the main layer, forming a preset spatial light intensity distribution. Edge sealing ribs are arranged around the outer contour of the main light guide layer. The height of the ribs is one millimeter higher than the upper and lower surfaces of the main layer. The cross-section of the ribs is rectangular. The inner side is fused with the side wall of the main layer. The outer side is provided with continuous wave-shaped anti-slip texture to enhance the friction positioning ability when the device is assembled with the outer shell and to prevent external moisture and contaminants from entering the internal optical interface. The bottom support base is located below the lower surface of the main light guide layer. The upper surface of the base is completely in contact with the bottom surface of the main layer. The base has a grid of intersecting reinforcing ribs. The ribs are 2 mm wide and 3 mm high, and the grid spacing is 10 mm. A circular reinforcing block is provided at the intersection of the ribs. The block is 5 mm in diameter and the height is the same as the rib. It is used to improve the rigidity of the overall structure and resist the deformation caused by temperature cycling and vibration load. The embedded temperature control flow channel assembly is buried inside the bottom support base and consists of multiple independent and closed ring pipes. Each pipe is arranged in a serpentine pattern along the length of the base, with an eight-millimeter spacing between adjacent pipes and an inner diameter of four millimeters. The two ends of the pipes are connected to the external temperature control liquid inlet and outlet, respectively. Each pipe is configured with a different flow rate and temperature of circulating medium according to the thickness difference of the main body layer corresponding to its location, so as to realize the step-by-step cooling control from the surface of the device to the core area. The exhaust channel network is distributed in the area where the main light guide layer and the bottom support base meet. It consists of a main exhaust channel and several branch exhaust channels. The main channel runs through the long axis of the device and has a cross-sectional size of 3 mm x 2 mm. The branch channels extend vertically to the potential gas accumulation area inside the main layer on both sides of the main channel. The end of the branch channel opens near the surface of the main layer and has a cross-sectional size of 1 mm x 1 mm. All channels are connected to the external vacuum pumping system during the injection molding stage. Before the melt is filled, negative pressure is applied to pre-expel the air in the cavity. During the filling process, a small amount of volatile gas is continuously pumped out. The surface microstructure array covers the entire light-emitting surface of the rear refractive layer and consists of densely arranged hemispherical bumps. The bumps are 0.5 mm in diameter, 0.2 mm in height, and 0.8 mm apart. The top of the bumps is passivated to diffusely modulate the emitted light, eliminate local bright spots, and improve visual uniformity.

[0006] Preferably, a transition buffer layer is provided between the front collimation layer and the main light guide layer. The thickness of this layer is 0.3 mm, and the material is a transparent elastomer with a refractive index between the front layer and the main layer. This layer is used to alleviate the interface stress concentration caused by the difference in thermal expansion coefficient and to prevent microcracks from forming after long-term use.

[0007] Preferably, the rear refractive layer and the main light guide layer are integrally molded using a co-injection molding process. The two layers are injected into the mold cavity in a molten state in stages. The main layer material is injected first, and after it is partially solidified, the rear layer material is injected to ensure that there is no risk of interface separation between the two layers, while maintaining optical continuity.

[0008] Preferably, the outer wall of each annular pipe in the embedded temperature control flow channel group is covered with a heat-insulating ceramic coating with a thickness of 0.1 mm, which is used to reduce thermal interference between adjacent pipes, maintain the independence of their respective temperature zones, and improve temperature control accuracy.

[0009] Preferably, a pressure sensing chamber is provided in the middle of the main exhaust channel of the exhaust channel network. The chamber contains a thin-film pressure sensor, and the sensor signal line is led out to the external interface of the device to monitor the gas pressure change in the cavity in real time and assist in adjusting the vacuum suction parameters.

[0010] Preferably, the bottom support base has positioning bosses at the four corners. The bosses are 5 mm high, have a square cross-section, and a side length of 8 mm. A tapered guide hole is opened at the center of the top surface of the boss. The diameter of the hole gradually decreases from 6 mm to 4 mm from top to bottom, which is used for precise alignment with the external mounting bracket.

[0011] Preferably, the wave-shaped anti-slip texture of the edge sealing rib is composed of a continuous sine curve, with a peak-to-trough height difference of 0.5 mm and a wavelength of 3 mm. The texture direction is parallel to the long side of the device, which enhances the lateral resistance to displacement.

[0012] Preferably, the hemispherical bumps of the surface microstructure array are arranged with different densities according to the region, with a density of 156 per square centimeter in the central region and 98 per square centimeter in the edge region, forming a scattering intensity gradient that gradually changes from the center to the edge, compensating for the brightness attenuation caused by the difference in the length of the light path.

[0013] Preferably, three fluorescent marking lines are embedded in the main light guide layer along the thickness direction. The marking lines are made of transparent resin filaments doped with rare earth elements, with a diameter of 0.1 mm. They are located at one-third of the thickness from the upper and lower surfaces and the center plane, respectively, and are used as interlayer position references during subsequent non-destructive testing.

[0014] Preferably, the reinforcing ribs of the bottom support base are locally densified near the branch outlet of the exhaust channel, with the grid spacing reduced to five millimeters and the rib width increased to three millimeters, in order to strengthen the structural support of the area surrounding the gas exhaust path and prevent local collapse.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: The device uses a pre-collimating layer to implement primary directional constraint on incident light, and the asymmetric arc surface structure of the post-refractive layer achieves secondary spatial redistribution. Combined with the diffuse modulation of the surface microstructure array, it achieves a high uniformity of light output, avoiding localized over-brightness or dark areas. The main light guide layer uses an anti-aging modified material to suppress molecular chain breakage under long-term light exposure, controlling the light decay after 5,000 hours of aging to within 3%. The embedded temperature-controlled flow channel group implements gradient cooling according to thickness zones, eliminating the difference in internal and external shrinkage rates, effectively suppressing warping deformation and surface shrinkage marks, and ensuring stable dimensional tolerances. The range is set within ±0.05 mm; the exhaust channel network thoroughly removes residual gas from the cavity under the dual action of pre-pressure and vacuum, eliminating the generation of internal bubbles, improving material density and structural integrity, and increasing light transmission uniformity by more than 8% compared to traditional structures; the composite light guide path design shortens the ineffective optical path and reduces total reflection loss, thereby improving the overall light energy utilization rate and reducing drive energy consumption by more than 10% under the same lighting brightness; the synergistic structure of the edge sealing ribs and the bottom support base enhances environmental resistance, ensuring no cracking or permanent deformation in the temperature range of -40 degrees Celsius to +85 degrees Celsius, meeting the stringent operating conditions of new energy vehicles. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a schematic diagram of the structure of this utility model.

[0017] In the figure: 1. Main light guide layer; 2. Front collimation layer; 3. Rear refractive layer; 4. Edge sealing rib; 5. Bottom support base; 6. Embedded temperature control flow channel group; 7. Exhaust channel network; 8. Surface microstructure array; 9. Transition buffer layer; 10. Fluorescent marker line. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1 to 3 This utility model provides an embodiment of a thick-walled automotive headlight light guide device. The device has a rectangular plate-like structure, with its length arranged along the transverse direction of the vehicle, its width extending longitudinally, and its thickness perpendicular to the headlight mounting surface. The main body of the device consists of a main light guide layer 1 with a thickness of 12 mm. The material is polycarbonate resin modified with anti-aging agents and light stabilizers. Before injection molding, 1% by mass of ultraviolet absorber and 0.5% by mass of hindered amine free radical scavenger are pre-mixed to improve the molecular chain stability under long-term light exposure. The upper and lower surfaces of the main light guide layer 1 are flat, the sidewalls are vertical, and the four corners are rounded with a radius of 1 mm to avoid stress concentration that could lead to crack initiation.

[0020] The pre-collimation layer 2 is attached to the light-incident end face of the main light guide layer 1. Its structure consists of thirty-seven parallel prismatic protrusions, each extending along the incident light direction. The cross-section of the prismatic protrusion is an isosceles trapezoid with an upper base length of 0.8 mm, a lower base length of 1.2 mm, and a height of 0.6 mm. The inclined angle is 15 degrees, calculated based on the typical divergence angle of 35 degrees for LED light sources. This ensures that the incident light converges towards the central axis after reflection by the inclined surface. The spacing between adjacent prisms is 0.3 mm, forming a continuous, gapless arrangement to ensure that all incident light is effectively... In terms of constraint direction, a transition buffer layer 9 is provided between the front collimation layer 2 and the main light guide layer 1. This layer is 0.3 mm thick and made of transparent silicone rubber with a refractive index of 1.54. Its coefficient of thermal expansion is between that of polycarbonate and air. During temperature cycling, it relieves interfacial shear stress and prevents the propagation of microcracks. The transition buffer layer 9 is formed synchronously with the front collimation layer 2 through a co-extrusion process. Then, it is connected to the main light guide layer 1 by a hot-press bonding process. The bonding pressure is set to 0.5 MPa, the temperature is 120 degrees Celsius, and the duration is 30 seconds to ensure that there are no air bubbles left at the interface.

[0021] The rear refractive layer 3 is located on the outer side of the light-emitting end face of the main light guide layer 1. Its structure consists of forty-nine asymmetrically distributed arc-shaped grooves. The grooves are arranged radially along the width of the device, with the density decreasing from the center area to the two edges. The groove depth in the center area is 0.8 mm, and the groove depth in the edge area is 0.4 mm. The radius of curvature of the groove arc surface gradually changes from 120 mm in the center to 80 mm at the edge. This parameter was determined by numerical simulation optimization based on the spatial distribution requirements of the target light emission angle of 60 to 90 degrees. The opening width of each groove is 1.5 mm, with a smooth transition at the bottom and no sharp corner structure to avoid light scattering loss. The rear refractive layer 3 and the main light guide layer 1 are integrally molded using a co-injection molding process. The main layer material is injected into the mold cavity first, and the rear layer material is injected after it cools to 140 degrees Celsius. The two layers of material permeate and fuse at the melting interface to form a continuous optical medium without physical separation. The injection pressure is 80 MPa in the first stage and 50 MPa in the second stage, with a holding time of 10 seconds. The cooling rate is controlled at 2 degrees Celsius per second to ensure that the two layers shrink synchronously.

[0022] The surface microstructure array 8 covers the entire light-emitting surface of the rear refractive layer 3 and consists of densely arranged hemispherical bumps. The bumps have a diameter of 0.5 mm, a height of 0.2 mm, and a top curvature radius of 0.25 mm. After mechanical polishing, a mirror passivation layer is formed. The bumps are divided into regions with different densities: within the central circular region with a diameter of 50 mm, the center-to-center spacing of the bumps is 0.8 mm, corresponding to 156 bumps per square centimeter; within the outer ring region with a width of 20 mm, the center-to-center spacing of the bumps is 1.2 mm, corresponding to 98 bumps per square centimeter; and within the outermost 10 mm wide region, no bumps are placed to maintain a smooth plane. This density gradient design compensates for the phenomenon of a bright center and dark edges caused by differences in the length of the light path, so that the uniformity deviation of the light-emitting surface illumination is less than 5%. The hemispherical bumps are formed on the surface of the mold through an in-mold etching process. The mold steel is S136 mirror stainless steel with a surface roughness Ra value of less than 0.05 micrometers to ensure replication accuracy.

[0023] Edge sealing ribs 4 are arranged around the outer contour of the main light guide layer 1. The height of the ribs is 1 mm higher than the upper and lower surfaces of the main body layer, with a total height of 14 mm. The cross-section is rectangular and the width is 3.5 mm. The inner side of the ribs is fused with the side wall of the main light guide layer 1 during injection molding. The width of the fusion area is 0.8 mm, and the fusion strength is greater than the strength of the main body material. The outer side of the ribs is provided with continuous wavy anti-slip texture. The texture is composed of a sine curve with a peak-to-trough height difference of 0.5 mm and a wavelength of 3 mm. The texture direction is parallel to the long side of the device. The texture is processed by laser engraving on the side wall of the mold with an engraving depth of 0.3 mm to ensure that the texture is clear and complete after demolding. During assembly, the edge sealing ribs 4 are interference-fitted with the inner wall of the headlight housing with an interference of 0.1 mm. The wavy texture increases frictional resistance and prevents vibration displacement. At the same time, the contact surface between the top of the ribs and the housing is coated with silicone sealant to form a double sealing barrier.

[0024] The bottom support base 5 is located below the lower surface of the main light guide layer 1. The upper surface of the base is completely in contact with the bottom surface of the main layer. The contact surface is sandblasted to form a rough surface with a Ra value of 1.6 micrometers to enhance the mechanical interlocking force. The base has a crisscrossing reinforcing rib grid inside. There are seven ribs along the length direction and five along the width direction. The ribs are 2 mm wide and 3 mm high. The grid spacing is 10 mm. There is a circular reinforcing block at the intersection of the ribs. The block has a diameter of 5 mm and a height of 3 mm. It is flush with the top of the rib. In the area near the branch outlet of the exhaust channel, the grid is locally densified and the spacing is reduced to 5 mm. The rib width is increased to 3 mm to resist the local negative pressure suction when the gas is discharged. There are positioning bosses at the four corners of the bottom support base 5. The bosses are 5 mm high and have a square cross-section with a side length of 8 mm. A conical guide hole is opened in the center of the top surface. The diameter of the hole gradually decreases from 6 mm to 4 mm from top to bottom. The cone angle is 60 degrees. This guide hole cooperates with the positioning pin on the headlight bracket to achieve an assembly accuracy of ±0.1 mm.

[0025] The embedded temperature-controlled flow channel group 6 is buried inside the bottom support base 5 and consists of nine independent, closed annular pipes. Each pipe is arranged in a serpentine pattern along the length of the base, with a single-trip length of 200 mm, three bends, an 8 mm spacing between adjacent pipes, an inner diameter of 4 mm, and a wall thickness of 1.5 mm. The two ends of each pipe are connected to external temperature-controlled liquid inlets and outlets, respectively, using G1 / 8 standard threads. Different cooling parameters are configured for each pipe based on the thickness difference of the main body layer in its corresponding area: three pipes in the central area lead to 15 mm... The system uses a 100°C coolant with a flow rate of 0.5 liters per minute. Four pipes in the middle area supply 20°C coolant at a flow rate of 0.3 liters per minute. Two pipes in the edge area supply 25°C coolant at a flow rate of 0.2 liters per minute. The outer walls of the pipes are coated with a heat-insulating ceramic coating made of zirconium oxide-alumina composite ceramic with a thickness of 0.1 mm and a thermal conductivity of less than 0.5 Kelvin per meter, effectively isolating heat transfer between adjacent temperature zones. The temperature control system uses PID closed-loop control, with a temperature fluctuation range of ±0.5°C.

[0026] The exhaust channel network 7 is distributed in the area where the main light guide layer 1 and the bottom support base 5 meet. It consists of one main exhaust channel and sixteen branch exhaust channels. The main channel runs through the long axis of the device, with a cross-sectional dimension of 3 mm x 2 mm, and is located on the center line of the base. The branch channels extend vertically to both sides of the main channel, with eight channels on each side. The length of the branch channels varies with their position, with the shortest branch being 25 mm and the longest being 45 mm. The branch channels open at the end near the surface of the main layer, 0.5 mm from the top surface. The cross-sectional dimension of each branch channel is 1 mm x 1 mm, and the end is horn-shaped. The cavity is flared at a 30-degree angle to prevent melt blockage. A pressure sensing chamber with a volume of 0.5 cubic centimeters is located in the middle of the main exhaust channel. It contains a thin-film pressure sensor with a Hastelloy C276 diaphragm material, a thickness of 0.1 millimeters, and a range of 0 to 0.1 MPa. The signal line is led out to an external data acquisition interface through a pre-embedded conduit inside the base. During injection molding, the cavity is first evacuated to -80 kPa and held for 5 seconds. Then, melt injection begins. During the injection process, the vacuum is maintained at -50 kPa until the holding pressure ends.

[0027] Three fluorescent marking lines 10 are embedded in the main light guide layer 1 along the thickness direction. The marking lines are made of transparent epoxy resin filaments doped with europium ions, with a diameter of 0.1 mm. They are located 4 mm from the upper and lower surfaces and 6 mm from the center plane, respectively. The marking lines are pre-placed in the mold cavity before injection molding and fixed by a tension clamp with a tension value of 0.5 Newtons to ensure a positional accuracy of ±0.05 mm. The fluorescent marking lines 10 emit 612 nm red light under 365 nm ultraviolet light irradiation, which is used as the interlayer positioning reference for optical tomography during subsequent non-destructive testing.

[0028] The entire injection molding process uses a two-color injection molding machine with a clamping force of 800 tons. The mold temperature is controlled in zones: 110 degrees Celsius for the main layer, 95 degrees Celsius for the rear layer, and 70 degrees Celsius for the temperature-controlled runner. The melt injection speed is controlled in three stages: the initial stage fills 30% of the cavity with 20 mm / s, the middle stage fills 50% with 10 mm / s, and the final stage fills the remaining portion with 5 mm / s to avoid internal stress caused by high-speed impact. The holding pressure is divided into two stages: the first stage is 60 MPa for 5 seconds, and the second stage is 30 MPa for 10 seconds. The cooling time is calculated based on the thickness at 1 second per millimeter, with a total cooling time of 12 seconds. After demolding, the mold is immediately transferred to a constant temperature and humidity chamber at 25 degrees Celsius and 50% humidity for 48 hours of aging treatment to eliminate residual stress.

[0029] During assembly, first align the positioning boss of the bottom support base 5 with the cone hole of the headlight bracket, apply axial pressure of 20 Newtons to complete the initial positioning, then apply silicone sealant along the outer periphery of the edge sealing rib 4 with a thickness of 0.3 mm, then press the entire device into the outer shell slot with a pressing force of 50 Newtons and hold for 10 seconds. The inlet and outlet of the embedded temperature control flow channel group 6 are connected to the external circulation system through quick-connect connectors, and the pressure sensor signal line of the exhaust channel network 7 is connected to the vehicle diagnostic interface. The final product is tested by an optical integrating sphere. After 5,000 hours of aging, the luminous flux retention rate is 97%, the warpage deformation is less than 0.03 mm, there are no visible bubble defects inside, and the light emission uniformity reaches ANSI FL1 standard Class A level.

[0030] When the vehicle is running, the light emitted by the LED light source is first oriented by the prism bevel of the front collimation layer 2 to reduce the divergence angle and improve the parallelism of the light. The oriented light enters the main light guide layer 1 and propagates through multiple total internal reflections in the thickness direction. During the process, some light is scattered by the fluorescent marker line 10 as a detection reference. When the light reaches the rear refractive layer 3, it is refracted and deflected by the arc-shaped groove interface to form a preset angle distribution. Finally, it is diffusely reflected and modulated by the hemispherical protrusions of the surface microstructure array 8 to eliminate hot spots and achieve uniform light output. The embedded temperature control flow channel group 6 continuously circulates coolant to maintain the temperature gradient of the main layer and prevent thermal deformation. The edge sealing rib 4 and the bottom support base 5 jointly bear the vibration load to ensure structural integrity. The pressure sensor of the exhaust channel network 7 provides real-time feedback on the cavity status and triggers an alarm when there is an abnormality.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A thick-walled light guide device for automotive lamps, characterized in that: It includes a main light guide layer, a front collimation layer, a rear refractive layer, edge sealing ribs, a bottom support base, an embedded temperature control channel assembly, an exhaust channel network, and a surface microstructure array, wherein: The main light guide layer is a transparent polymer solid with a thickness of six to twenty millimeters; the pre-collimation layer is attached to the light-incident end face of the main light guide layer and is composed of multiple parallel prism-shaped protrusions with trapezoidal cross-sections. The rear refractive layer is located on the outer side of the light-emitting end face of the main light guide layer, and is composed of asymmetrically distributed arc-shaped grooves, with the groove depth decreasing from the center to the edge. The edge sealing ribs surround the outer contour of the main light guide layer, and the height of the ribs is one millimeter higher than the upper and lower surfaces of the main layer. The bottom support base is located below the lower surface of the main light guide layer, and is equipped with a reinforcing mesh and a circular reinforcing block inside.

2. The thick-walled automotive lamp light guide device according to claim 1, characterized in that: The embedded temperature-controlled flow channel assembly is buried inside the bottom support base and consists of multiple serpentine annular pipes.

3. The thick-walled automotive lamp light guide device according to claim 1, characterized in that: The exhaust channel network is distributed in the area where the main light guide layer and the bottom support base meet, including the main exhaust channel and branch exhaust channels.

4. The thick-walled automotive lamp light guide device according to claim 1, characterized in that: The surface microstructure array covers the light-emitting surface of the rear refractive layer and is composed of hemispherical protrusions.

5. The thick-walled automotive lamp light guide device according to claim 1, characterized in that: A transition buffer layer is provided between the pre-collimation layer and the main light guide layer. The thickness of this layer is 0.3 mm, and the material is a transparent elastomer with a refractive index between the pre-collimation layer and the main light guide layer.

6. The thick-walled automotive lamp light guide device according to claim 1, characterized in that: Each annular pipe in the embedded temperature-controlled flow channel assembly is covered with a heat-insulating ceramic coating on its outer wall, with a coating thickness of 0.1 mm.

7. The thick-walled automotive lamp light guide device according to claim 1, characterized in that: The main exhaust channel of the exhaust channel network is provided with a pressure sensing chamber in the middle, and a thin-film pressure sensor is built into the chamber. The sensor signal line is led out to the external interface of the device.

8. The thick-walled automotive lamp light guide device according to claim 1, characterized in that: The bottom support base has positioning bosses at its four corners. The bosses are 5 mm high, square in cross-section, and 8 mm long on each side. A tapered guide hole is opened at the center of the top surface of the boss, and the diameter of the hole gradually decreases from 6 mm to 4 mm from top to bottom.

9. The thick-walled automotive lamp light guide device according to claim 1, characterized in that: The outer surface of the edge sealing rib is provided with a continuous wave-shaped anti-slip texture. The texture is composed of a sine curve with a peak-to-trough height difference of 0.5 mm and a wavelength of 3 mm. The texture direction is parallel to the long side of the device.

10. The thick-walled automotive lamp light guide device according to claim 1, characterized in that: The hemispherical bumps of the surface microstructure array are arranged with different densities according to the region, with a density of 156 per square centimeter in the central region and 98 per square centimeter in the edge region.

Images