Automobile lamp outer lens, automobile lamp, and manufacturing method suitable for automobile lamp outer lens

Abstract

The application relates to the technical field of automobile lamps, and provides a vehicle lamp outer lens, a vehicle lamp and a preparation method suitable for the vehicle lamp outer lens, which comprises the following steps: S1, printing a required black pattern on a film structure through an oil printing technology; S2, placing the film structure after the oil printing into a pressing mold to press the film structure into a required outer lens shape; S3, placing the film structure after the pressing into an injection molding mold, controlling the injection molding mold to be closed and injecting a base material to form a base layer on the film structure; S4, taking the product out of the injection molding mold and placing the product into an annealing device to perform annealing treatment; and S5, taking the product out of the annealing device after the annealing of the product is completed. Compared with the prior art, the application solves the problems of additional hardening coating and poor impact resistance of pure PMMA material, and has the advantages of low cost and high light transmittance.

Description

Technical Field

[0001] This invention relates to the field of automotive lighting technology, specifically to an external lens for automotive lighting, an automotive lighting lamp, and a method for manufacturing an external lens for automotive lighting. Background Technology

[0002] The outer lens of a car headlight is a transparent protective structure located on the outermost part of the headlight, serving multiple functions such as allowing light to pass through, isolating the external environment, and protecting the internal components of the headlight cavity.

[0003] PC, also known as polycarbonate or PC plastic, is a common material for automotive headlight lenses. Due to its susceptibility to scratches and UV sensitivity, it requires a curing process. However, this curing process demands a large amount of solvent, which is ultimately released as volatile organic compounds (VOCs), negatively impacting the environment. In contrast, PMMA (polycarbonate-based material) can filter UV rays, is scratch-resistant, and has high light transmittance. However, PMMA has poor toughness and is not impact-resistant, making it unsuitable for direct use in automotive headlight lenses. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this invention is to provide an external lens for vehicle lights, a vehicle light, and a method for manufacturing an external lens for vehicle lights.

[0005] A method for manufacturing an external lens for automotive headlights according to the present invention includes the following steps:

[0006] S1: Print the required black pattern onto the membrane structure using an inkjet printing technique;

[0007] S2: Place the printed film structure into a pressing mold and press it into the desired outer lens shape;

[0008] S3: Place the pressed membrane structure into an injection molding mold, control the injection molding mold to close and inject the base material to form a base layer on the membrane structure;

[0009] S4: Remove the product from the injection mold and place it in the annealing equipment for annealing treatment;

[0010] S5: Remove the product from the annealing equipment after annealing is complete.

[0011] Preferably, the substrate layer is made of PMMA material, and the membrane structure adopts any of the following:

[0012] PC film, the PC film being disposed inside the substrate layer;

[0013] Toughened PMMA membrane;

[0014] A first composite film is formed by attaching a PC film onto a PMMA film, and the first composite film is disposed inside the substrate layer.

[0015] A second composite film is formed by attaching a PC film onto a toughened PMMA film; or

[0016] The substrate layer is made of PC material, and the membrane structure adopts any of the following:

[0017] A PMMA membrane is disposed on the outer side of the substrate layer;

[0018] A toughened PMMA membrane, wherein the toughened PMMA membrane is disposed on the outer side of the substrate layer;

[0019] A first composite film is formed by attaching a PMMA film to the outside of a PC film, and the first composite film is disposed on the outside of the substrate layer.

[0020] A second composite membrane is formed by attaching a toughened PMMA membrane to the outside of a PC membrane.

[0021] A method for manufacturing an external lens for automotive headlights according to the present invention includes the following steps:

[0022] S1: A base layer injection molded from high-temperature PMMA material into the desired outer lens shape;

[0023] S2: Place the injection-molded base layer into a silicone injection mold;

[0024] S3: Injecting silicone into a silicone injection mold to form a silicone material adhesion layer on the inner side of the substrate layer, and completing the first curing in the silicone injection mold;

[0025] S4: After removing the product from the silicone injection mold, place it in the curing equipment for a second curing;

[0026] S5: After the product has cooled, remove the finished product from the curing equipment.

[0027] According to the present invention, an outer lens for a vehicle headlight includes a film structure and a base layer. The film structure is printed with a desired black pattern using an inkjet printing technique and then placed in a pressing mold to be pressed into the desired outer lens shape. The pressed film structure with the outer lens shape is then placed in an injection molding mold. The injection molding mold is controlled to close and a base material is injected to complete the injection molding on the film structure and form the base layer.

[0028] According to the present invention, an outer lens for a vehicle headlight includes a film structure and a base layer. The base layer is injection molded into the desired shape using high-temperature PMMA material. The injection-molded base layer is placed in a silicone injection mold, and the silicone injection mold is closed and silicone is injected into the silicone injection mold to form a silicone material adhesion layer on the inner side of the base layer. After the first curing is completed in the silicone injection mold, the product is removed and placed in a curing device for a second curing.

[0029] Preferably, a permeable layer is formed between the membrane structure and the substrate layer to provide adhesion.

[0030] Preferably, the thickness of the permeation layer is 10 μm to 50 μm.

[0031] According to the present invention, a vehicle lamp includes a housing and an external lens of the vehicle lamp mounted on the housing.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. This invention uses in-mold injection molding (IML) technology to inject PMMA or PC materials onto a membrane structure to form a composite material, thus producing an automotive headlight lens that does not require additional coating to compensate for performance defects. The membrane structure can be made of PC film, silicone film, PMMA film, toughened PMMA film, composite film formed by PMMA and PC, or composite film formed by toughened PMMA and PC. This solves the problem of needing additional hardening coating and achieves the environmentally friendly process effect of eliminating the emission of volatile organic compounds during coating.

[0034] 2. This invention utilizes PC film or composite film for in-mold injection molding, providing the finished product with better UV resistance and scratch resistance. This solves the problems of poor UV resistance and scratch resistance of pure PC material, or poor toughness and impact resistance of pure PMMA material. It achieves the effect of protecting the internal components and appearance of the vehicle headlights, while also solving the problem of poor impact resistance of pure PMMA material, providing the finished product with better impact resistance and achieving the effect of protecting pedestrians.

[0035] 3. By using PMMA and PC film composite materials, this invention eliminates the additional coating process, reduces the production cost of automotive headlight lenses, and improves light transmittance compared to the original PC material hardening coating process, achieving higher light source utilization.

[0036] 4. This invention eliminates the additional coating process by using a PC+PMMA composite film and forming multiple composite materials through injection molding with PC or PMMA materials, thereby reducing the production cost of automotive headlight lenses. Moreover, it has more significant advantages over the original PC material hardening coating process. Attached Figure Description

[0037] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0038] Figure 1 This is a cross-sectional schematic diagram of the outer lens of the headlight in Example 1;

[0039] Figure 2 This is a cross-sectional schematic diagram of the outer lens of the headlight in Example 4;

[0040] Figure 3 This is a cross-sectional schematic diagram of the outer lens of the vehicle headlight in Example 6;

[0041] Figure 4 This is a cross-sectional schematic diagram of the outer lens of the vehicle headlight in Example 8.

[0042] The diagram shows:

[0043] Membrane structure 1

[0044] basal layer 2 Detailed Implementation

[0045] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0046] Basic Implementation Example:

[0047] This invention provides a method for manufacturing automotive headlight outer lenses, employing an IML (In-Molding Label) injection molding process. IML is characterized by a hardened transparent film on the surface, a printed pattern layer in the middle, and a plastic layer on the back. Because the ink is sandwiched in the middle, the product is protected from scratches, maintains vibrant colors for a long time, is resistant to fading, and achieves abrasion resistance. The method includes the following steps:

[0048] S1: Print the required black pattern onto membrane structure 1 using an inkjet printing technique;

[0049] S2: Place the printed membrane structure 1 into a pressing mold and press it into the desired outer lens shape;

[0050] S3: Place the pressed membrane structure 1 into an injection molding mold, control the injection molding mold to close and inject the base material to form a base layer 2 on the membrane structure 1;

[0051] S4: Remove the product from the injection mold and place it in the annealing equipment for annealing treatment;

[0052] S5: Remove the product from the annealing equipment after annealing is complete.

[0053] Specifically, the substrate 2 is made of PMMA material, and the membrane structure 1 adopts any of the following:

[0054] PC film, the PC film being disposed inside the substrate layer 2;

[0055] PMMA membrane;

[0056] Toughened PMMA membrane;

[0057] The first composite film is formed by attaching a PC film to a PMMA film, and the first composite film is arranged inside the substrate layer 2.

[0058] A second composite film is formed by attaching a PC film onto a toughened PMMA film;

[0059] or

[0060] The substrate layer 2 is made of PC material, and the membrane structure 1 adopts any of the following:

[0061] A PMMA membrane is disposed on the outer side of the substrate layer 2;

[0062] A toughened PMMA membrane, wherein the toughened PMMA membrane is disposed on the outer side of the substrate layer 2;

[0063] A first composite film is formed by attaching a PMMA film to the outside of a PC film, and the first composite film is disposed on the outside of the substrate layer 2.

[0064] A second composite membrane is formed by attaching a toughened PMMA membrane to the outside of a PC membrane.

[0065] This invention also provides a method for manufacturing an external lens for automotive headlights, comprising the following steps:

[0066] S1: The base layer 2, which is injection molded into the required outer lens shape using high-temperature PMMA material, for example, PMMA HT material, wherein high-temperature PMMA material refers to material with a temperature of 105℃~115℃;

[0067] S2: Place the injection-molded base layer 2 into a silicone injection mold;

[0068] S3: Injecting silicone into the silicone injection mold to form a silicone material adhesion layer on the inner side of the base layer 2, and completing the first curing in the silicone injection mold. Curing is also called vulcanization. The purpose of the first curing is to enable rapid demolding in a solid form, reduce the time occupied in the mold, so as to improve molding efficiency and reduce costs.

[0069] S4: After removing the product from the silicone injection mold, it is placed in a curing device for a second curing. Since the product has only been cured and shaped after the first curing, it needs to be placed in the curing device for a second curing.

[0070] S5: After the product cools, remove the finished product from the curing equipment, such as a curing oven.

[0071] Specifically, the preparation method in this embodiment requires the use of high-temperature PMMA material. During preparation, the PMMA product needs to be completed first, and then the silicone is thermosetting by injection molding. The thickness of the silicone needs to be limited to less than 50 mm. The mold needs to be specially designed and surface treated, such as lining the inside of the mold cavity with a layer of Teflon.

[0072] Silicone also has an anti-fogging function, which can replace the anti-fogging step in the existing technology process, solve the problem of needing additional hardening coating, achieve the environmentally friendly process effect of eliminating the emission of volatile organic compounds in the coating, and at the same time reduce the production cost of automotive headlight outer lenses.

[0073] The present invention also provides an external lens for a vehicle headlight, comprising a film structure 1 and a base layer 2. The film structure 1 is printed with a required black pattern using an oil printing technique and then placed in a pressing mold to be pressed into the required external lens shape. The pressed film structure 1 with the external lens shape is then placed in an injection molding mold, and the injection molding mold is closed and the base material is injected to complete the injection molding on the film structure 1 and form the base layer 2.

[0074] The present invention also provides an outer lens for a vehicle headlight, including a film structure 1 and a base layer 2. The base layer 2 is injection molded into the required outer lens shape using high-temperature PMMA material, and the injection-molded base layer 2 is placed in a silicone injection mold. The silicone injection mold is closed and silicone is injected into the silicone injection mold to form a silicone material adhesion layer on the inner side of the base layer 2. After the first curing is completed in the silicone injection mold, the product is removed and placed in a curing device for a second curing. The adhesion layer is a non-film structure and is thicker than the film structure 1. The adhesion layer is equivalent to forming an additional base with a certain thickness on the base layer 2.

[0075] In this invention, a permeable layer is formed between the membrane structure 1 and the substrate layer 2, and a permeable layer is also formed between the substrate layer 2 and the adhesion layer. The permeable layer can provide adhesion and ensure that the materials do not delaminate. The thickness of the permeable layer is 10μm to 50μm.

[0076] The present invention also provides a vehicle lamp, including a housing and an external lens mounted on the housing.

[0077] Example 1:

[0078] This embodiment is the first preferred example. This embodiment provides a method for fabricating an external lens for automotive headlights. The film structure 1 uses a PC film, and specifically includes the following steps:

[0079] S1: Print the desired black pattern onto the flat PC film using an inkjet printing technique;

[0080] S2: Place the printed PC film into a pressing mold and press it into the desired shape of the car headlight outer lens;

[0081] S3: Place the pressed PC film into the injection mold, control the mold to close, and inject PMMA material to form the PMMA base layer 2 on the side of the PC film with the black pattern printed on it. The PC film is located on the inner side of the base layer 2. Figure 1 As shown, the temperature control during the injection molding process is 80℃~100℃, for example, 85℃, 90℃, 95℃, etc., and the temperature of the injected PMMA material is 240℃~260℃, for example, 245℃, 250℃, 255℃, etc.; through the above temperature control methods, a permeation layer is formed between the PC film and the PMMA material base layer 2 after injection molding to provide adhesion and ensure that the materials do not delaminate. The thickness of the permeation layer is preferably 10μm~50μm, for example, 20μm, 30μm, 40μm, etc.

[0082] S4: Remove the product from the injection mold and place it in the annealing equipment for annealing treatment;

[0083] S5: Remove the product from the annealing equipment after annealing is complete.

[0084] The preparation method in this invention changes the existing approach of IML injection molding, which generally requires the same materials to complete product preparation. By using temperature control, it achieves injection molding of PMMA and PC composite materials, solving the problem of poor impact resistance of pure PMMA and achieving the effect of protecting pedestrians. It should be noted that the membrane material can be a single layer or multiple layers can be injection molded. A layer of silicone can also be added on top of the PC membrane. Silicone, also known as organic silicone plastic, is made by compression molding or lamination of silicone resin as the basic component with fillers such as mica powder, asbestos, glass fiber, or glass cloth. These materials have high heat resistance, excellent electrical insulation and arc resistance, as well as waterproof and moisture-proof properties. This invention, by employing a multi-layer structure, provides higher impact resistance, greater toughness, and more composite functions compared to a single-layer membrane, such as anti-fogging functionality.

[0085] Specifically, PMMA (polymethyl methacrylate) is a high molecular weight polymer, also known as acrylic or plexiglass, and has advantages such as high transparency, low price, and ease of machining. PC (polycarbonate), also known as PC plastic, is a high molecular weight polymer containing carbonate groups in its molecular chain. Due to the special structure of polycarbonate, it has become the fastest-growing general-purpose engineering plastic among the five major engineering plastics.

[0086] Example 2:

[0087] This embodiment provides a method for fabricating an external lens for automotive headlights. Unlike Embodiment 1, the membrane structure 1 uses a toughened PMMA membrane. The toughened PMMA membrane is made of PMMA material with special toughness and impact resistance. The method specifically includes the following steps:

[0088] S1: Print the desired black pattern onto the flat toughened PMMA film using an inkjet printing technique;

[0089] S2: Place the toughened PMMA film with the printed coating into a pressing mold and press it into the required shape of the headlight outer lens;

[0090] S3: Place the toughened PMMA film after pressing into an injection molding mold, control the mold to close and inject PMMA material to form a PMMA base layer 2 on the toughened PMMA film. The temperature of the injected PMMA material is 220℃~250℃, for example, 225℃, 230℃, 235℃, 240℃, 245℃, etc. The mold temperature during the injection molding process is controlled to be 50℃~75℃, for example, 55℃, 60℃, 65℃, 70℃, etc. Through the above temperature control methods, a permeation layer is formed between the toughened PMMA film and the base layer 2 after injection molding. The permeation layer can provide adhesion and ensure that the materials do not delaminate. The thickness of the permeation layer is preferably 10μm~50μm.

[0091] S4: After removing the product from the injection molding mold, place it in an annealing equipment for annealing treatment;

[0092] S5: After the product has cooled, remove the finished product from the annealing equipment.

[0093] The preparation method in this invention changes the existing approach of IML injection molding process, which generally requires the same material to complete the product preparation. By using toughened PMMA film, it realizes the injection molding of toughened PMMA + non-toughened PMMA composite material, which solves the problem of poor impact resistance of pure PMMA material and achieves the effect of protecting the internal components and appearance of the vehicle headlight.

[0094] In this embodiment, the thickness of the toughened PMMA film is 0.375mm to 0.5mm, for example, 0.4mm, 0.45mm, etc.

[0095] Example 4:

[0096] The difference between this embodiment and Embodiment 1 is that membrane structure 1 uses a composite membrane, which is formed by laminating a PMMA membrane and a PC membrane. The PMMA membrane is made of PMMA Foil material, and the PC membrane is made of PC material. Figure 2 As shown, the method specifically includes the following steps:

[0097] S1: Print the desired black pattern onto the planar composite film using mimeographing technology;

[0098] S2: Place the printed composite film into a pressing mold and press it into the required shape of the car headlight outer lens;

[0099] S3: Place the pressed composite film into an injection molding mold, control the mold to close, and inject PMMA material to complete the injection molding on the outer surface of the composite film and form the base layer 2. The temperature control during the injection molding process is 90℃~110℃, for example, 100℃, and the temperature of the injected PMMA material is 200℃~250℃, for example, 210℃, 220℃, 230℃, 240℃, with 225℃ being the optimal choice. Through the above temperature control, a permeation layer is formed between the composite film and the base layer 2 after injection molding to provide adhesion and ensure that the materials do not delaminate. The thickness of the permeation layer is preferably 10μm~50μm.

[0100] S4: After removing the product from the injection molding mold, place it in an annealing equipment for annealing treatment;

[0101] S5: After the product has cooled, remove the finished product from the annealing equipment.

[0102] The preparation method in this invention changes the existing approach of IML injection molding, which generally requires the same material to complete the product preparation. By using a composite film, the injection molding of PMMA+PMMA+PC composite material is achieved, solving the problem of poor toughness and impact resistance of pure PMMA material. The impact test results show that the impact strength of this invention is 2 times higher than that of pure PMMA material, which meets the requirements for use in vehicle headlights and achieves the effect of protecting the internal components and appearance of the headlight, as well as protecting pedestrians.

[0103] This embodiment also provides an external lens for a vehicle headlight, including a composite film and a base layer 2. The composite film is formed by laminating a PMMA film and a PC film. The PMMA film is made of PMMA foam material, and the PC film is made of PC material. The base layer 2, the PMMA film, and the PC film are all arranged on the external lens of the vehicle headlight and sequentially arranged in the inward direction of the external lens. Figure 2 As shown.

[0104] Example 5:

[0105] In this embodiment, the membrane structure 1 still uses a composite membrane. The difference from embodiment 4 is that the composite membrane is formed by bonding a toughened PMMA membrane and a PC membrane. The impact test results show that the impact strength of this embodiment is 3 to 4 times higher than that of pure PMMA material, which meets the requirements for use of vehicle headlights.

[0106] Example 6:

[0107] This embodiment provides a method for fabricating an external lens for automotive headlights. Unlike Embodiment 1, in this embodiment, the film structure 1 is a PMMA film, and the substrate layer 2 is made of PC material. Figure 3 As shown, the specific steps include the following:

[0108] S1: Print the desired black pattern onto the flat PMMA film using an inkjet printing technique;

[0109] S2: Place the printed PMMA film in a pressing mold and press it into the desired shape of the headlight outer lens;

[0110] S3: Place the pressed PMMA film into the injection molding mold, control the mold to close, and inject PC material to form the PC base layer 2 on the side of the PMMA film with the black pattern printed on it. The PMMA film is located on the outer side of the base layer 2. Figure 3 As shown, the temperature controlled during the injection molding process is 70℃~120℃, for example, 80℃, 90℃, 100℃, 110℃, with 100℃ being the optimal choice. The temperature of the injected PC material is 250℃~320℃, for example, 260℃, 270℃, 280℃, 290℃, 300℃, 310℃, with 285℃ being the optimal choice. Through the above temperature control methods, a permeation layer is formed between the PMMA film and the PC substrate layer 2 after injection molding to provide adhesion and ensure that the materials do not delaminate. The thickness of the permeation layer is preferably 10μm~50μm, for example, 20μm, 30μm, 40μm, etc.

[0111] S4: Remove the product from the injection mold and place it in the annealing equipment for annealing treatment;

[0112] S5: Remove the product from the annealing equipment after annealing is complete.

[0113] Example 7:

[0114] This embodiment provides a method for preparing an external lens for automotive headlights. Unlike embodiment 6, the membrane structure 1 in this embodiment uses a toughened PMMA membrane, and the base layer 2 is made of PC material, which can also achieve the effect of the present invention.

[0115] Example 8:

[0116] This embodiment provides a method for fabricating an external lens for automotive headlights. The film structure 1 uses a composite film, which is formed by laminating a PMMA film and a PC film. Unlike embodiment 4, the substrate layer 2 is made of PC material. Figure 4 As shown, the method specifically includes the following steps:

[0117] S1: Print the desired black pattern onto the planar composite film using mimeographing technology;

[0118] S2: Place the printed composite film into a pressing mold and press it into the required shape of the car headlight outer lens;

[0119] S3: Place the pressed composite film into an injection molding mold, control the mold to close, and inject PC material to complete the injection molding on the inner side of the composite film and form the base layer 2. The temperature during the injection molding process is controlled at 70℃~120℃, for example, 80℃, 90℃, 100℃, or 110℃, with 100℃ being the optimal choice. The temperature of the injected PC material is 250℃~320℃, for example, 260℃, 270℃, 280℃, 290℃, 300℃, or 310℃, with 285℃ being the optimal choice. Through the above temperature control methods, a permeation layer is formed between the injection-molded composite film and the base layer 2 to provide adhesion and ensure that the materials do not delaminate. The thickness of the permeation layer is preferably 10μm~50μm.

[0120] S4: After removing the product from the injection molding mold, place it in an annealing equipment for annealing treatment;

[0121] S5: After the product has cooled, remove the finished product from the annealing equipment.

[0122] This invention achieves injection molding of PMMA+PC+PC composite materials by using a composite film, providing better UV resistance and scratch resistance. It solves the problems of easy scratching and UV sensitivity of pure PC materials. After using this composite film, the scratch resistance can fully meet the requirements of vehicle headlights and meet the stringent regulations of various countries, such as US standard FMVSS108 and SAE J 1383. It achieves the effect of protecting the internal components and appearance of the headlights, as well as protecting pedestrians.

[0123] This embodiment also provides an external lens for a vehicle headlight, including a composite film and a base layer 2. The composite film is formed by laminating a PMMA film and a PC film. The PMMA film is made of PMMA Foil material, and the PC film is made of PC material. The base layer 2, the PC film, and the PMMA film are all arranged on the external lens of the vehicle headlight and sequentially along the outward direction of the external lens. Figure 4 As shown.

[0124] Example 9:

[0125] This embodiment provides a method for manufacturing an outer lens for automotive headlights. Unlike Embodiment 8, the composite film is formed by bonding a toughened PMMA film and a PC film, achieving the same effect as described in this invention. The manufacturing method of this invention changes the existing approach of IML injection molding, which generally requires the same materials for product manufacturing. By using a composite film, it achieves injection molding of composite materials, solving the problem of poor UV resistance and scratch resistance of pure PC materials, thus protecting both the internal components and the exterior of the headlight.

[0126] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0127] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for producing an outer lens for a vehicle lamp, characterized by, Includes the following steps: S1: Print the required black pattern on the membrane structure (1) using an inkjet printing technique; S2: Place the printed membrane structure (1) into a pressing mold and press it into the required outer lens shape; S3: Place the pressed membrane structure (1) into the injection molding mold, control the injection molding mold to close and inject the base material to form a base layer (2) on the membrane structure (1). S4: Remove the product from the injection mold and place it in the annealing equipment for annealing treatment; S5: Remove the product from the annealing equipment after annealing is complete; The substrate layer (2) is made of PMMA material, and the membrane structure (1) adopts any of the following: The first composite film is formed by attaching PC film to PMMA film. The first composite film is arranged inside the base layer (2). The base layer (2), PMMA film and PC film are arranged on the outer lens of the headlight and arranged in sequence along the inward direction of the outer lens of the headlight. The second composite film is formed by attaching PC film to toughened PMMA film. The base layer (2), toughened PMMA film and PC film are all arranged on the outer lens of the headlight and arranged in sequence along the inward direction of the outer lens of the headlight. Alternatively, the substrate layer (2) may be made of PC material, and the membrane structure (1) may be any of the following: The first composite film is formed by attaching a PMMA film to the outside of a PC film. The first composite film is arranged on the outside of the base layer (2). The base layer (2), the PC film, and the PMMA film are all arranged on the outer lens of the headlight and arranged sequentially in the direction outward from the outer lens of the headlight. The toughened PMMA film is attached to the outside of the PC film to form a second composite film. The base layer (2), the PC film and the toughened PMMA film are all arranged on the outer lens of the headlight and arranged in sequence along the direction outward from the outer lens of the headlight.

2. The method for manufacturing an external lens for automotive headlights according to claim 1, characterized in that, The thickness of the toughened PMMA film is 0. ~ 0.5 .

3. An external lens for a vehicle headlight, characterized in that, The method for preparing an external lens for automotive headlights according to claim 1 or 2 includes a film structure (1) and a base layer (2). The film structure (1) is printed with a black pattern by an inkjet printing technique and then placed in a pressing mold to press it into the desired external lens shape. The pressed film structure (1) with the external lens shape is placed in an injection molding mold, and the injection molding mold is closed and the base material is injected to complete the injection molding on the film structure (1) and form the base layer (2).

4. The vehicle headlight outer lens according to claim 3, characterized in that, A permeable layer is formed between the membrane structure (1) and the base layer (2) or between the base layer (2) and the adhesion layer to provide adhesion.

5. The external lens for a vehicle headlight according to claim 4, characterized in that, The thickness of the permeable layer is 10. ~50 .

6. A vehicle light, characterized in that, Includes a housing and an external lens for a vehicle headlight as described in any one of claims 3 to 5, mounted on the housing.

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