Manufacturing method and manufacturing device for double-sided heterogeneous laser etching car lamp lens or decorating part

Abstract

The invention discloses a manufacturing method and a manufacturing device for a double-sided heterogeneous laser etching car lamp lens or decorating part. The manufacturing method comprises the following steps: S1, fixing a transparent base material part on a workbench; s2, laser etching processing is conducted on the front face of the transparent base material part, and a first laser etching texture layer is completed; s3, overturning and accurately aligning the transparent base material part; s4, performing laser etching processing on the back surface to complete a second laser etching texture layer; and S5, cleaning and inspecting. The manufacturing device comprises a 3D laser engraving machine, a laser device, an engraving machine integrated CCD camera system, an industrial personal computer, a special clamp and a transparent base material, and the transparent base material is installed on the special clamp. Through careful design and matching of double-sided textures, a visual effect which cannot be achieved by a traditional single-sided laser etching technology can be created, the visual hierarchy and interaction of the product are greatly enriched, and the design additional value and brand identification degree of the product are remarkably improved.

Description

Technical Field

[0001] This invention relates to a method and apparatus for manufacturing automotive headlight lenses and decorative parts by laser engraving related patterns on both sides of a transparent substrate, thereby creating special three-dimensional and dynamic visual effects. It belongs to the field of laser engraving texture technology. Background Technology

[0002] With the booming development of the automotive industry and the continuous improvement of consumers' aesthetics, car lights are no longer limited to fulfilling basic lighting functions. Their design, recognizability, and technological feel are becoming the finishing touch to the overall vehicle design. With its advantages of high precision, high efficiency, and design flexibility, laser engraving technology is widely used in the surface texture processing of components such as headlight lenses, decorative covers, and ambient lighting panels to present brand logos, intricate patterns, or technological textures.

[0003] Currently, most mainstream laser engraving processes in the industry focus on a single surface of a component (usually the outer or inner surface). For example, specific light and shadow effects are achieved by engraving microstructures on the inner surface of a lens, or high-gloss mirror textures are engraved on the surface of decorative parts to enhance their texture. Although single-sided laser engraving patterns are already quite exquisite, their essence is still limited to the two-dimensional or shallow three-dimensional visual realm, and the depth and dynamic expression of the visual effect are limited. When the viewing angle changes, the improvement in the three-dimensionality and dynamism of the pattern is not significant, making it difficult to create truly stunning and revolutionary visual effects.

[0004] Furthermore, while existing technologies disclose the use of laser engraving to create dazzling effects through light reflection and refraction, their structural foundation has not yet broken through the paradigm of single-sided processing. Existing double-sided processing techniques (such as "double-sided laser engraving") are usually only used to create unrelated patterns on both sides of the board, and have not yet involved actively designing new and unified three-dimensional visual effects by utilizing the specific correlation between the patterns on the front and back sides.

[0005] Therefore, how to break through the visual limitations of single-sided processing through structural innovation based on mature laser engraving technology, and create visual effects with greater depth, layering and dynamic interaction, has become a technical bottleneck that urgently needs to be overcome in the field of automotive lighting and interior / exterior design. Summary of the Invention

[0006] The present invention aims to provide a method for manufacturing double-sided heterogeneous laser-engraved automotive headlight lenses or decorative parts, so as to achieve enhanced visual effects such as stereoscopic parallax, dynamic moiré stripes or pattern suspension that cannot be achieved by traditional single-sided laser engraving.

[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows: A method for manufacturing a double-sided heterogeneous laser-engraved automotive lamp lens or decorative part includes the following steps: S1. Fix the transparent substrate component onto the worktable; S2. Perform laser engraving on the front of the transparent substrate component to complete the first laser engraving texture layer; S3. Flip and precisely align the transparent substrate component to ensure geometric consistency between the two surfaces before and after flipping; S4. After completing the precise alignment, perform laser engraving on the back to complete the second laser engraving texture layer. The pattern design of the second laser engraving texture layer and the first laser engraving texture layer is heterogeneous but related to each other. That is, the patterns on the front and back are not completely consistent, but there is a specific geometric mapping, position offset or periodic difference relationship. S5. Perform cleaning and inspection, and apply a surface hardening coating if necessary to enhance the scratch resistance of PC or PMMA materials.

[0008] Furthermore, to achieve a parallax effect—a significant relative displacement between pattern elements when the observer's viewpoint moves left, right, or up and down—the transparent substrate is a PMMA lens with a thickness of T = 3mm and a refractive index n ≈ 1.49. A first laser-engraved texture layer is formed by engraving a set of parallel vertical lines with a spacing of 1mm on the front side of the transparent substrate, with an engraving depth of 50μm. A second laser-engraved texture layer is formed by engraving parallel vertical lines corresponding to the lines of the first laser-engraved texture layer on the back side of the transparent substrate, also with a spacing of 1mm and a depth of 50μm. Crucially, each line in the second laser-engraved texture layer has a preset parallax offset d in the horizontal direction relative to its corresponding line on the front side.

[0009] The visual effect is that when an observer is facing a PMMA lens, the two sets of lines may appear to almost overlap. When the observer moves their head to the left, due to light refraction and physical separation, the lines on the front will shift to the right relative to the lines on the back; conversely, moving the head to the right will cause the lines on the front to shift to the left. This strong relative displacement induces the brain to perceive a deep three-dimensional space far beyond that of a single-sided bas-relief carving.

[0010] Furthermore, in order to achieve the dynamic moiré pattern effect, create A dynamic visual effect in which interference fringes flow, change, and scale with varying viewing angles. The transparent substrate is a PC material decorative piece with a thickness of T=2.5mm. A set of fine periodic grating structures is engraved on the front to form a first laser-engraved texture layer, and another set of fine periodic grating structures is engraved on the back to form a second laser-engraved texture layer. The pitch of the second laser-engraved texture layer is slightly different from that of the first laser-engraved texture layer.

[0011] The visual effect lies in the fact that the component displays clearly magnified moiré rings when viewed statically. As the observer or light source moves, these moiré rings exhibit a striking dynamic effect, as if light and shadow are flowing within the component. This effect is highly technological and futuristic, making it particularly suitable for charging indicator lights, welcome lights, and interior ambient lighting in new energy vehicles.

[0012] Furthermore, to achieve the floating effect, a unique visual effect is created where the main pattern is not simply attached to the surface, but rather appears to float three-dimensionally within the transparent substrate. The transparent substrate is made of high-transmittance PMMA material with a thickness of T = 4mm, used to create the brand logo decorative parts for the vehicle's center console. The main pattern of the brand logo is processed on the back of the transparent substrate using 3D internal engraving or surface laser engraving techniques. On the front of the transparent substrate, instead of engraving the logo itself, shadow or highlight patterns of the main pattern are engraved at corresponding positions according to a preset virtual light source direction. The shape and position of these shadow / highlight patterns require precise calculation to ensure a self-consistent three-dimensional logical relationship between them and the main pattern on the back.

[0013] The visual effect lies in the fact that the observer does not see a flat sign, but rather a sign that appears to be sealed within a transparent crystal block, possessing a three-dimensional thickness and a full sense of volume. As the viewing angle changes, highlights and shadows flow delicately across the surface of the subject, and subtle shifts in light and shadow create a wondrous sense of suspension and exquisite refinement.

[0014] Furthermore, step S3 involves flipping and precisely aligning the transparent substrate component using a dedicated fixture. A precise positioning reference is set on the dedicated fixture. After the first side is engraved, the transparent substrate is flipped and installed on the other side of the dedicated fixture. The same positioning reference is used to ensure geometric consistency before and after flipping. After compensation based on the coordinate system relationship by the laser engraving system, the second side is engraved.

[0015] Furthermore, in step S3, the transparent substrate component is flipped and precisely aligned automatically using machine vision. When the first side is being engraved, micro-reference marks are simultaneously engraved in the non-functional area of ​​the transparent substrate. After flipping, the engraving machine's integrated CCD camera system automatically captures the mark positions and uses image recognition algorithms to accurately calculate the spatial pose of the component. The coordinate system of the engraved pattern on the second side is then automatically adjusted to achieve sub-millimeter or even micrometer-level alignment accuracy.

[0016] This invention also provides a device for manufacturing double-sided heterogeneous laser-engraved automotive headlight lenses or decorative parts, used in the above-mentioned manufacturing method. It includes a 3D laser engraving machine, a laser, an integrated CCD camera system, an industrial control computer, a special fixture, and a transparent substrate, wherein the transparent substrate is mounted on the special fixture. The industrial control computer is connected to the laser, the 3D laser engraving machine, and the engraving machine's integrated CCD camera system. The engraving machine's integrated CCD camera system is used to detect the position of the transparent substrate and transmit instructions to the industrial control computer. The industrial control computer sends a signal to the 3D laser engraving machine to indicate whether to engrave based on the transmitted instructions.

[0017] Furthermore, the special fixture includes a base, a rotating shaft, and a clamping foot fixing platform fixed on the rotating shaft. Several clamping feet are provided around the top and bottom of the clamping foot fixing platform. A clamping turntable mechanism is provided at both ends of the rotating shaft. The clamping turntable mechanism is used to fix the rotating shaft after the clamping foot fixing platform is flipped.

[0018] Furthermore, the fixture turntable mechanism is a positioning pin.

[0019] The principle of this invention lies in the fact that the patterns of the first laser-engraved texture layer and the second laser-engraved texture layer are heterogeneous but interconnected, meaning that the patterns on the front and back are not completely identical, but there are specific geometric mappings, positional offsets, or periodic differences. When light passes through the component or the observer's viewing angle moves, the two texture layers produce superposition, interference, or misalignment effects, together forming an overall unit with a special three-dimensional or dynamic visual effect.

[0020] Compared with existing technologies, this invention, through its three-dimensional structural design of "transparent substrate + front heterogeneous laser engraving layer + back heterogeneous laser engraving layer," has the following significant advantages: 1. Breakthrough visual experience: The meticulous design and matching of double-sided textures can create visual effects that traditional single-sided laser engraving technology cannot achieve, such as a strong sense of stereoscopic parallax, moiré stripes that change dynamically with the viewing angle, and the wonderful illusion that the pattern is suspended inside the component, which greatly enriches the visual layers and interactivity of the product.

[0021] 2. Structural Innovation and High Added Value: The core protection of this invention lies in its three-in-one hierarchical structure and the matching relationship of its internal patterns. This structural innovation significantly enhances the product's design added value and brand recognition, making the headlights or decorative parts eye-catching dynamic works of art on the vehicle.

[0022] 3. Strong Technical Feasibility: This solution relies on mature 3D laser engraving technology. Existing high-precision laser equipment can perform micron-level precision processing on both sides of transparent materials such as PC and PMMA. Simultaneously, industrial-grade alignment technologies, such as high-precision fixtures or machine vision-based automatic camera alignment systems, ensure accurate registration of the front and back patterns, guaranteeing a perfect final visual effect.

[0023] 4. Basic functions remain unaffected: Through precise control of laser engraving depth, density, and position, while achieving excellent visual effects, it ensures that the optical performance (such as light transmittance and light pattern distribution) of functional components such as headlight lenses meets relevant industry standards (such as the requirements of SAE J576 for material optical performance), thus achieving a unity of aesthetics and function. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an embodiment of the manufacturing method involved in the present invention.

[0025] Figure 2 This is a schematic diagram of the manufacturing apparatus involved in the present invention.

[0026] Figure 3 This is a front view of the special fixture involved in this invention.

[0027] Figure 4 This is a top view of the special fixture involved in this invention. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The objectives, technical solutions, and advantages of the present invention will become clearer from the following description. It should be noted that the described embodiments are preferred embodiments of the present invention, but not all embodiments.

[0029] A method for manufacturing a double-sided heterogeneous laser-engraved automotive lamp lens or decorative part includes the following steps: S1. Fix the transparent substrate component onto the worktable; S2. Perform laser engraving on the front of the transparent substrate component to complete the first laser engraving texture layer; S3. Flip and precisely align the transparent substrate component to ensure the geometric consistency of the two sides before and after flipping. That is, the patterns on the front and back sides are not completely consistent, but there is a specific geometric mapping, position offset or periodic difference relationship. This step can be achieved using a special fixture. A precise positioning reference is set on the special fixture. After the first side is engraved, the transparent substrate is flipped over and installed on the other side of the special fixture. The same positioning reference is used to ensure geometric consistency before and after flipping. After compensation based on the coordinate system relationship by the laser engraving system, the second side is engraved.

[0030] Alternatively, the transparent substrate component can be flipped and precisely aligned automatically using machine vision: while the first side is being engraved, micro-reference marks are simultaneously engraved in the non-functional area of ​​the transparent substrate. After flipping, the engraving machine integrates a CCD camera system to automatically capture the mark position, accurately calculate the spatial pose of the component through image recognition algorithms, and automatically adjust the coordinate system of the engraved pattern on the second side to achieve sub-millimeter or even micrometer-level alignment accuracy.

[0031] S4. After completing the precise alignment, perform laser engraving on the back to complete the second laser engraving texture layer. The pattern design of the second laser engraving texture layer and the first laser engraving texture layer is heterogeneous but related to each other. That is, the patterns on the front and back are not completely consistent, but there is a specific geometric mapping, position offset or periodic difference relationship. S5. Perform cleaning and inspection, and apply a surface hardening coating if necessary to enhance the scratch resistance of PC or PMMA materials.

[0032] refer to Figure 2 A device for manufacturing double-sided heterogeneous laser-engraved automotive headlight lenses or decorative parts includes a 3D laser engraving machine 1, a laser 2, an integrated CCD camera system 3, an industrial control computer 4, a special fixture 5, and a transparent substrate 6, wherein the transparent substrate 6 is mounted on the special fixture 5. The industrial control computer 4 is connected to the laser 2, the 3D laser engraving machine 1, and the integrated CCD camera system 3. The integrated CCD camera system 3 is used to detect the position of the transparent substrate 6 and transmit instructions to the industrial control computer 4. The industrial control computer 4 sends a signal to the 3D laser engraving machine 1 to indicate whether to engrave based on the transmitted instructions.

[0033] refer to Figure 3 and Figure 4 The special clamp 5 includes a base 5a, a rotating shaft 5b, and a clamping foot fixing platform 5c fixed on the rotating shaft. Several clamping feet 5d are provided around the top and bottom surfaces of the clamping foot fixing platform 5c. A clamping turntable mechanism 5e is provided at both ends of the rotating shaft. The clamping turntable mechanism 5e is used to fix the rotating shaft after the clamping foot fixing platform 5c is flipped. The clamping turntable mechanism 5e preferably uses locating pins.

[0034] Example 1: Achieving a stereoscopic parallax effect This embodiment aims to achieve a strong sense of three-dimensional depth: when the observer's viewpoint moves left and right or up and down, there is a significant relative displacement between the pattern elements.

[0035] In this embodiment, the transparent substrate is a PMMA lens with a thickness of T=3mm and a refractive index n≈1.49.

[0036] A set of parallel vertical lines with a spacing of 1 mm are engraved on the front of the transparent substrate to form the first laser engraving texture layer, with an engraving depth of 50 μm.

[0037] A second laser-engraved texture layer is formed by engraving parallel vertical lines corresponding to the lines of the first laser-engraved texture layer on the back of a transparent substrate. The spacing is also 1 mm and the depth is 50 μm. The key point is that each line of the second laser-engraved texture layer has a preset parallax offset d in the horizontal direction relative to its corresponding line on the front.

[0038] Technical principles and parameter calculations The parallax effect in this embodiment stems from the difference in light path perceived by an observer when viewing two sets of patterns separated by substrate thickness from different angles. This can be referenced to the parallax mapping principle in binocular stereoscopic vision and computer graphics. When light rays originate from the back lines, pass through a substrate with refractive index n and thickness T to reach the front, their apparent depth T' is approximately T / n. To generate the desired virtual depth perception at a specific viewing angle variation Δθ, the offset d can be estimated based on geometric optics principles. For example, d is proportional to the apparent depth T' of the substrate. A simplified design method involves inputting front and back pattern models into optical simulation software (such as ZEMAX or LightTools), simulating the visual effects under different viewing angles, and iteratively optimizing the value of the offset d until the optimal stereoscopic depth perception is obtained.

[0039] refer to Figure 1 The visual effect of this embodiment is that when an observer is facing the transparent substrate, the two sets of lines may appear to almost overlap. When the observer moves their head to the left, due to light refraction and physical separation, the lines on the front will shift to the right relative to the lines on the back; conversely, moving the head to the right will cause the lines on the front to shift to the left. This strong relative displacement induces the brain to perceive a deep three-dimensional space far exceeding that of a single-sided bas-relief carving.

[0040] Example 2: Achieving a Dynamic Moiré Pattern Effect

[0041] This embodiment aims to create a dynamic visual effect in which interference fringes flow, change, and scale with the viewing angle.

[0042] In this embodiment, a transparent substrate made of PC material with a thickness of T=2.5mm is used for the decorative parts. The front is engraved. A set of fine, periodic grating structures forms the first laser-etched texture layer, for example, concentric circles with a pitch of p1 = 100 μm. Another set of fine, periodic grating structures is engraved on the back side to form the second laser-etched texture layer, with a pitch that differs slightly from the first laser-etched texture layer, for example, p2 = 102 μm.

[0043] Technical principles and parameter calculations Moiré fringes are macroscopic interference patterns generated by the frequency difference when two periodic patterns are superimposed. In this embodiment, two sets of concentric circular gratings on the front and back sides are visually superimposed. Due to their slightly different spatial frequencies (determined by the pitches p1 and p2), a set of magnified and low-frequency annular moiré fringes will be generated. As the observer's viewing angle changes, the perspective relationship between the two gratings changes in real time, causing the superposition effect to evolve dynamically. The moiré fringes flow, scale, or shift accordingly, forming a strong visual dynamism. In addition to changing the pitch, the pitch can also be kept the same but a small rotation angle α can be made between the two sets of gratings, which can also produce dynamic moiré fringes.

[0044] The visual effect of this embodiment is that the PC material decorative part exhibits clearly magnified moiré rings when viewed statically. As the observer or light source moves, these moiré rings display a striking dynamic effect, as if light and shadow are flowing within the component. This effect is highly technological and futuristic, and is particularly suitable for charging indicator lights, welcome lights, and interior ambient lighting in new energy vehicles.

[0045] Example 3: Achieving a Floating Effect This embodiment aims to create a unique visual effect where the main pattern is not simply attached to the surface, but rather appears to float three-dimensionally inside a transparent substrate.

[0046] In this embodiment, the transparent substrate is made of high-transmittance PMMA material with a thickness of T = 4mm, which is used to make the brand logo decorative parts of the center console in the car.

[0047] The main pattern of the brand logo (such as a three-dimensional "S" shaped logo) is processed on the back of the transparent substrate (the second laser-engraved texture layer) using 3D internal engraving or surface laser engraving technology.

[0048] Instead of engraving the logo itself on the front side of the transparent substrate (first laser-engraved texture layer), the shadow or highlight pattern of the "S"-shaped logo is engraved at corresponding positions according to the preset virtual light source direction. The shape and position of this shadow / highlight pattern need to be precisely calculated to ensure that it forms a self-consistent three-dimensional logical relationship with the main pattern on the back.

[0049] Technical Principles This effect utilizes the human brain's visual compensation and stereoscopic perception mechanisms. When the brain simultaneously observes an object (the back label) and its shadow / highlight (the front pattern), it automatically interprets it as a complete object in three-dimensional space. Because the shadow / highlight layer and the main body layer are separated by the physical thickness T of the substrate, this physical separation enhances the visual depth cues, ultimately causing the brain to determine that the main label "floats" above the shadow, thus creating a highly realistic illusion of suspension.

[0050] The visual effect of this embodiment is that the observer does not see a flat sign, but rather a sign that appears to be sealed within a transparent crystal block, possessing a three-dimensional thickness and a full sense of volume. As the viewing angle changes, highlights and shadows flow delicately across the surface of the main body, and subtle shifts in light and shadow create a wondrous sense of suspension and exquisite refinement.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Obviously, any person skilled in the art can easily conceive of substitutions or variations based on the above embodiments to obtain other embodiments, and these should all be covered within the scope of protection of the present invention.

Claims

1. A method for manufacturing a double-sided heterogeneous laser-engraved automotive lamp lens or decorative part, characterized in that, Includes the following steps: S1. Fix the transparent substrate component onto the worktable; S2. Perform laser engraving on the front of the transparent substrate component to complete the first laser engraving texture layer; S3. Flip and precisely align the transparent substrate component to ensure geometric consistency between the two surfaces before and after flipping; S4. After completing the precise alignment, perform laser engraving on the back to complete the second laser engraving texture layer. The pattern design of the second laser engraving texture layer and the first laser engraving texture layer is heterogeneous but related to each other. That is, the patterns on the front and back are not completely consistent, but there is a specific geometric mapping, position offset or periodic difference relationship. S5. Perform cleaning and inspection, and apply a surface hardening coating if necessary to enhance the scratch resistance of PC or PMMA materials.

2. The method for manufacturing a double-sided heterogeneous laser-engraved automotive lamp lens or decorative part according to claim 1, characterized in that: The transparent substrate is a PMMA lens with a thickness T = 3 mm and a refractive index n ≈ 1.

49. A first laser-engraved texture layer is formed by engraving a set of parallel vertical lines with a spacing of 1 mm on the front side of the transparent substrate, with an engraving depth of 50 μm. A second laser-engraved texture layer is formed by engraving parallel vertical lines corresponding to the lines of the first laser-engraved texture layer on the back side of the transparent substrate, with the same spacing of 1 mm and a depth of 50 μm. The key point is that each line of the second laser-engraved texture layer has a preset parallax offset d in the horizontal direction relative to its corresponding line on the front side.

3. The method for manufacturing a double-sided heterogeneous laser-engraved automotive lamp lens or decorative part according to claim 1, characterized in that: The transparent substrate is made of PC material with a thickness of T=2.5mm, and a set of decorative parts are engraved on the front. A finely shaped periodic grating structure forms the first laser-engraved texture layer. Another set of finely shaped periodic grating structures is engraved on the back to form the second laser-engraved texture layer, with a pitch that is slightly different from that of the first laser-engraved texture layer.

4. The method for manufacturing a double-sided heterogeneous laser-engraved automotive lamp lens or decorative part according to claim 1, characterized in that: The transparent substrate is made of high-transmittance PMMA material with a thickness of T=4mm, used to manufacture the brand logo decorative parts for the vehicle's center console. The main logo pattern is created on the back of the transparent substrate using 3D internal engraving or surface laser engraving technology. Instead of engraving the logo itself on the front of the transparent substrate, shadow or highlight patterns of the main pattern are engraved at corresponding positions according to a preset virtual light source direction. The shape and position of these shadow / highlight patterns require precise calculation to ensure a self-consistent three-dimensional logical relationship between them and the main pattern on the back.

5. The method for manufacturing a double-sided heterogeneous laser-engraved automotive lamp lens or decorative part according to claim 1, characterized in that: Step S3 involves flipping and precisely aligning the transparent substrate component using a dedicated fixture. A precise positioning reference is set on the fixture. After the first side is engraved, the transparent substrate is flipped and installed on the other side of the fixture. The same positioning reference is used to ensure geometric consistency before and after the flip. After compensation based on the coordinate system relationship by the laser engraving system, the second side is engraved.

6. The method for manufacturing a double-sided heterogeneous laser-engraved automotive lamp lens or decorative part according to claim 1, characterized in that: The flipping and precise alignment of the transparent substrate component in step S3 is automatically aligned by machine vision. When the first side is being engraved, micro-reference marks are simultaneously engraved in the non-functional area of ​​the transparent substrate. After flipping, the engraving machine integrates a CCD camera system to automatically capture the mark position. The spatial pose of the component is accurately calculated through image recognition algorithms, and the coordinate system of the engraved pattern on the second side is automatically adjusted to achieve sub-millimeter or even micrometer-level alignment accuracy.

7. A device for manufacturing double-sided heterogeneous laser-engraved automotive lamp lenses or decorative parts, used in the manufacturing method according to any one of claims 1 to 5, characterized in that: It includes a 3D laser engraving machine, a laser, an integrated CCD camera system, an industrial control computer, a special fixture, and a transparent substrate, the transparent substrate being mounted on the special fixture. The industrial control computer is connected to the laser, the 3D laser engraving machine, and the integrated CCD camera system. The integrated CCD camera system detects the position of the transparent substrate and transmits instructions to the industrial control computer. Based on the transmitted instructions, the industrial control computer sends a signal to the 3D laser engraving machine indicating whether to engrave.

8. The apparatus for manufacturing double-sided heterogeneous laser-engraved automotive lamp lenses or decorative parts according to claim 7, characterized in that: The special fixture includes a base, a rotating shaft, and a clamping foot fixing platform fixed on the rotating shaft. Several clamping feet are provided around the top and bottom edges of the clamping foot fixing platform. The two ends of the rotating shaft are provided with clamping turntable mechanisms, which are used to fix the rotating shaft after the foot fixing platform is flipped.

9. The apparatus for manufacturing double-sided heterogeneous laser-engraved automotive lamp lenses or decorative parts according to claim 8, characterized in that: The fixture turntable mechanism is a positioning pin.

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