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

Abstract

The present invention relates to the technical field of automobile lamps. Provided are an automobile lamp outer lens, an automobile lamp and a manufacturing method suitable for an automobile lamp outer lens. The method comprises the following steps: S1, printing a required black pattern onto a film structure by means of ink printing; S2, placing into a pressing mold the film structure which has undergone the ink printing and pressing same into a required outer lens shape; S3, putting the pressed film structure into an injection moulding mold, controlling the injection moulding mold to be closed, and injecting a substrate material so as to form a substrate layer on the film structure; S4, taking a product out of the injection moulding mold, placing same in an annealing apparatus and performing annealing treatment; and S5, after the annealing of the product is completed, taking the product out of the annealing apparatus. Compared with the prior art, the present invention solves the problems that extra hardening coating is needed and pure PMMA materials have poor impact resistance, and also achieves a low cost and high light-transmittance.

Description

Vehicle lamp outer lens, vehicle lamp, and preparation method for vehicle lamp outer lens Technical Field

[0001] The present invention relates to the technical field of automobile lamps, and in particular to an outer lens of an automobile lamp, an automobile lamp, and a preparation method suitable for the outer lens of the automobile lamp. Background Art

[0002] The outer lens of a car headlight is a transparent protective structure located on the outermost side of the headlight. It plays multiple roles, such as transmitting light, isolating from the external environment, and protecting the internal components of the lamp cavity.

[0003] PC, also known as polycarbonate (PC plastic) in Chinese, is a common exterior lens material. Due to its scratch-susceptibility and UV sensitivity, it requires a hardening process. However, this hardening process requires a large amount of solvent, which is ultimately released as volatile organic compounds (VOCs), which is environmentally unfriendly. Compared to PC, PMMA filters UV rays, is scratch-resistant, and has high light transmittance. However, PMMA lacks toughness and impact resistance, making it unsuitable for direct use in headlight exterior lenses.

[0004] Summary of the Invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide an outer lens of a vehicle lamp, a vehicle lamp, and a method for preparing the outer lens of a vehicle lamp.

[0006] According to the present invention, a method for preparing an outer lens of a vehicle lamp includes the following steps:

[0007] S1: Print the required black pattern on the membrane structure using mimeograph technology;

[0008] S2: placing the printed film structure in a pressing mold and pressing it into the desired outer lens shape;

[0009] S3: placing the pressed membrane structure into an injection molding die, controlling the injection molding die to close, and injecting a base material to form a base layer on the membrane structure;

[0010] S4: Take the product out of the injection molding mold and place it in an annealing device for annealing;

[0011] S5: After the product annealing is completed, it is taken out from the annealing equipment.

[0012] Preferably, the base layer is made of PMMA material, and the membrane structure is any of the following:

[0013] A PC film, wherein the PC film is arranged on the inner side of the base layer;

[0014] Toughened PMMA film;

[0015] A first composite film is formed by attaching the PC film to the PMMA film, and the first composite film is arranged on the inner side of the base layer;

[0016] A second composite film formed by attaching a PC film to a toughened PMMA film; or

[0017] The base layer is made of PC material, and the membrane structure is any of the following:

[0018] A PMMA film, the PMMA film being arranged on the outside of the base layer;

[0019] A toughened PMMA film, wherein the toughened PMMA film is arranged on the outside of the base layer;

[0020] A first composite film formed by attaching a PMMA film to the outside of the PC film, wherein the first composite film is arranged on the outside of the base layer;

[0021] The toughened PMMA film is attached to the outside of the PC film to form a second composite film.

[0022] According to the present invention, a method for preparing an outer lens of a vehicle lamp includes the following steps:

[0023] S1: The base layer is injection molded into the desired outer lens shape using high-temperature PMMA material;

[0024] S2: placing the molded base layer into a silicone injection mold;

[0025] S3: Injecting silicone into the silicone injection mold to form an adhesion layer of silicone material on the inner side of the base layer, and completing a first curing in the silicone injection mold;

[0026] S4: After taking the product out of the silicone injection mold, place it in the curing equipment for the second curing;

[0027] S5: After the product has cooled, remove the finished product from the curing equipment.

[0028] According to the present invention, a headlight outer lens includes a membrane structure and a base layer. The membrane structure is printed with a required black pattern using an offset printing technique and then placed in a pressing mold to be pressed into a required outer lens shape. The pressed membrane structure having the outer lens shape is placed in an injection molding mold, and the injection molding mold is controlled to close and the base material is injected to complete the injection molding on the membrane structure and form the base layer.

[0029] According to the present invention, a headlight outer lens includes a membrane structure and a base layer. The base layer is injection-molded using high-temperature PMMA material into the desired outer lens shape. The molded base layer is then placed in a silicone injection mold. The silicone injection mold is controlled to close and silicone is injected into the mold to form an adhesion layer of silicone material on the inner side of the base layer. After a first curing step in the silicone injection mold, the product is removed and placed in a curing device for a second curing step.

[0030] Preferably, a permeation layer is formed between the membrane structure and the substrate layer to provide adhesion.

[0031] Preferably, the thickness of the permeation layer is 10 μm to 50 μm.

[0032] A vehicle lamp provided according to the present invention includes a housing and the vehicle lamp outer lens mounted on the housing.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The present invention uses the in-mold molding technology (IML) to inject PMMA material or PC material onto a film structure to form a composite material, thereby preparing an automotive headlight outer lens that does not require additional coating to compensate for performance defects. The film structure can be made of PC film, silicone film, PMMA film, toughened PMMA film, a composite film formed by PMMA and PC, or a composite film formed by toughened PMMA and PC, which 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.

[0035] 2. The present invention uses PC film to complete in-mold injection molding or composite film to complete in-mold injection molding, thereby providing the finished product with better UV resistance and scratch resistance, solving the problem of poor UV resistance and scratch resistance of pure PC materials, or the problem of poor toughness and collision resistance of pure PMMA materials, achieving the effect of protecting the internal components and appearance of the headlights, and at the same time solving the problem of poor impact resistance of pure PMMA materials, providing the finished product with better impact resistance, and achieving the effect of protecting pedestrians.

[0036] 3. The present invention eliminates the additional coating process by using a composite material of PMMA and PC film, thereby reducing the production cost of the outer lens of the headlight. Compared with the original process of adding hardened PC material to the coating, the light transmittance is improved, thereby achieving a higher light source utilization rate.

[0037] 4. The present invention eliminates the process of additional coating by using PC+PMMA composite film and a method of forming a multiple composite material by injection molding of PC material or PMMA material, thereby reducing the cost of producing the outer lens of the headlight. Compared with the original process of PC material plus hardened coating, the process advantage is more obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0039] FIG1 is a schematic cross-sectional view of an outer lens of a headlight in Example 1;

[0040] FIG2 is a schematic cross-sectional view of an outer lens of a headlight in Example 4;

[0041] FIG3 is a schematic cross-sectional view of an outer lens of a headlight in Example 6;

[0042] FIG4 is a schematic cross-sectional view of the outer lens of the vehicle lamp in Example 8.

[0043] The figure shows: membrane structure 1 base layer 2 DETAILED DESCRIPTION

[0044] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0045] Basic Example:

[0046] The present invention provides a method for preparing an outer lens for a headlight, using an IML injection molding process. IML (In Molding Label) is known in Chinese as in-mold insert molding. The process features a hardened transparent film on the surface, a printed pattern layer in the middle, and a plastic layer on the back. The ink sandwiched between the layers prevents the product from being scratched, maintains vibrant colors for a long time, resists fading, and achieves friction resistance. The method comprises the following steps:

[0047] S1: Print the required black pattern on the membrane structure 1 using mimeograph technology;

[0048] S2: placing the printed film structure 1 in a pressing mold and pressing it into the desired outer lens shape;

[0049] S3: placing the pressed membrane structure 1 into an injection molding die, controlling the injection molding die to close, and injecting a base material to form a base layer 2 on the membrane structure 1;

[0050] S4: Take the product out of the injection molding mold and place it in an annealing device for annealing;

[0051] S5: After the product annealing is completed, it is taken out from the annealing equipment.

[0052] Specifically, the base layer 2 is made of PMMA material, and the membrane structure 1 is made of any of the following:

[0053] PC film, the PC film is arranged on the inner side of the base layer 2;

[0054] Toughened PMMA film;

[0055] A first composite film is formed by attaching a PC film to a PMMA film, and the first composite film is arranged on the inner side of the base layer 2;

[0056] A second composite film formed by attaching a PC film to a toughened PMMA film;

[0057] or

[0058] The base layer 2 is made of PC material, and the membrane structure 1 is made of any of the following:

[0059] A PMMA film, the PMMA film being arranged on the outside of the base layer 2;

[0060] A toughened PMMA film, the toughened PMMA film being arranged on the outside of the base layer 2;

[0061] A first composite film formed by attaching a PMMA film to the outside of the PC film, wherein the first composite film is arranged on the outside of the base layer 2;

[0062] The toughened PMMA film is attached to the outside of the PC film to form a second composite film.

[0063] The present invention also provides a method for preparing an outer lens of a vehicle lamp, comprising the following steps:

[0064] S1: using high-temperature PMMA material for injection molding to form a base layer 2 in the desired outer lens shape, for example, PMMA HT material is used, wherein the high-temperature PMMA material refers to a material having a temperature of 105° C. to 115° C.;

[0065] S2: placing the molded base layer 2 into a silicone injection mold;

[0066] S3: Injecting silicone into the silicone injection mold to form an adhesion layer of silicone material 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 the mold is occupied, thereby improving molding efficiency and reducing costs;

[0067] S4: After taking the product out of the silicone injection mold, put it into the curing equipment for the second curing. Since the product after the first curing is only cured and formed, it needs to be put into the curing equipment for the second curing.

[0068] S5: After the product has cooled, the finished product is taken out from the curing equipment, such as a curing oven.

[0069] Specifically, the preparation method in this embodiment requires the use of high-temperature PMMA material. During the preparation, the PMMA finished product must be completed first, and then the heat-curing silicone is injection-molded. The thickness of the silicone needs to be limited to less than 50 mm. The mold requires special design and surface treatment, such as lining the inside of the mold molding cavity with a layer of Teflon.

[0070] Silicone also has an anti-fog effect and can replace the anti-fog step in existing technical processes, solving the problem of needing additional hardening coating, achieving the environmentally friendly process effect of eliminating the emission of volatile organic compounds during coating, and at the same time reducing the cost of producing the outer lens of the headlight.

[0071] The present invention also provides an outer lens for a headlight, comprising a membrane structure 1 and a base layer 2. The membrane structure 1 is printed with a required black pattern using an offset printing technique and then placed in a pressing mold to be pressed into the required outer lens shape. The pressed membrane structure 1 having the outer lens shape is placed in an injection molding mold, and the injection molding mold is controlled to close and the base material is injected to complete the injection molding on the membrane structure 1 and form the base layer 2.

[0072] The present invention also provides an outer lens for a headlight, comprising a membrane structure 1 and a base layer 2. The base layer 2 is injection molded into a desired outer lens shape using high-temperature PMMA material, and the molded base layer 2 is placed in a silicone injection mold. The silicone injection mold is controlled to close and silicone is injected into the silicone injection mold so that an adhesion layer of silicone material is formed on the inner side surface of the base layer 2. After the first curing is completed in the silicone injection mold, the product is taken out and placed in a curing device for a second curing. The adhesion layer is a non-membrane structure and is thicker than the membrane structure 1. The adhesion layer is equivalent to forming an additional base with a certain thickness on the base layer 2.

[0073] A permeation layer is formed between the membrane structure 1 and the base layer 2 of the present invention, and a permeation layer is also formed between the base layer 2 and the adhesion layer. The permeation layer can provide adhesion and ensure that the materials are not delaminated. The thickness of the permeation layer is 10μm to 50μm.

[0074] The present invention also provides a vehicle lamp, comprising a housing and an outer lens of the vehicle lamp mounted on the housing.

[0075] Example 1:

[0076] This embodiment is the first preferred embodiment. This embodiment provides a method for preparing an outer lens of a vehicle lamp. The film structure 1 adopts a PC film and specifically includes the following steps:

[0077] S1: Print the required black pattern on the flat PC film using mimeograph technology;

[0078] S2: Place the printed PC film in a pressing mold and press it into the required shape of the headlight outer lens;

[0079] S3: placing the pressed PC film into an injection molding mold, controlling the injection molding mold to close the mold, and injecting PMMA material to complete the injection molding on the side of the PC film with the black pattern printed on it to form a base layer 2 made of PMMA material, and the PC film is located on the inner side of the base layer 2, as shown in Figure 1, wherein the control temperature during the injection molding process of the injection molding mold is 80°C to 100°C, for example, 85°C, 90°C, 95°C, etc., and the temperature of the injected PMMA material is 240°C to 260°C, for example, 245°C, 250°C, 255°C, etc.; a permeation layer is formed between the PC film and the base layer 2 of PMMA material after injection molding by the above temperature control means to provide adhesion and ensure that there is no delamination between the materials, and the thickness of the permeation layer is preferably 10μm to 50μm, for example, 20μm, 30μm, 40μm, etc.;

[0080] S4: Take the product out of the injection molding mold and place it in an annealing device for annealing;

[0081] S5: After the product annealing is completed, it is taken out from the annealing equipment.

[0082] The preparation method of the present invention changes the idea that the IML injection molding process in the prior art generally requires the same materials to complete the preparation of the product. The injection molding of PMMA and PC composite materials is achieved by temperature control means, which solves the problem of poor impact resistance of pure PMMA materials and achieves the effect of protecting pedestrians. It should be noted that the film material can be used in only one layer or can be injection molded in multiple layers. A layer of Silicone can be added on the basis of the PC film. The Chinese name of Silicone is silicone plastic. It is made of silicone resin as the basic component and is made by precision compression molding or lamination with fillers such as mica powder, asbestos, glass fiber or glass cloth. They have higher heat resistance, better electrical insulation and arc resistance, as well as waterproof and moisture-proof properties. The present invention adopts a multi-layer structure to have higher impact resistance, greater toughness and more composite functions, such as anti-fog function, compared with a single-layer film.

[0083] Specifically, PMMA (polymethyl methacrylate) is a high molecular weight polymer, also known as acrylic or organic glass, with advantages such as high transparency, low price, and easy machining. PC (polycarbonate) is a high molecular weight polymer containing carbonate groups in its molecular chain. Due to its unique structure, polycarbonate has become the fastest-growing general-purpose engineering plastic among the five major engineering plastics.

[0084] Example 2:

[0085] This embodiment provides a method for preparing an outer lens of a vehicle lamp. Unlike Example 1, the membrane structure 1 uses a toughened PMMA film, which is made of a PMMA material with special toughness and impact resistance. The method specifically includes the following steps:

[0086] S1: Print the required black pattern on the flat toughened PMMA film using the offset printing technique;

[0087] S2: The printed toughened PMMA film is placed in a pressing mold and pressed into the desired shape of the headlight outer lens;

[0088] S3: placing the toughened PMMA film after pressing into an injection molding mold, controlling the injection molding mold to close the mold and injecting PMMA material to form a base layer 2 made of PMMA material on the toughened PMMA film, the temperature of the injected PMMA material is 220°C to 250°C, for example, 225°C, 230°C, 235°C, 240°C, 245°C, etc., wherein the mold temperature of the injection molding mold is controlled to be 50°C to 75°C, for example, 55°C, 60°C, 65°C, 70°C, etc., through the above temperature control means, a permeation layer is formed between the toughened PMMA film after injection molding and the base layer 2, the permeation layer can provide adhesion and ensure that the materials are not delaminated, and the thickness of the permeation layer is preferably 10μm to 50μm;

[0089] S4: After taking the product out of the injection molding mold, it is placed in an annealing device for annealing treatment;

[0090] S5: After the product has cooled, take it out of the annealing equipment.

[0091] The preparation method of the present invention changes the idea of ​​the existing IML injection molding process that generally requires the same materials to prepare products. By using toughened PMMA film, the injection molding of toughened PMMA + non-toughened PMMA composite materials is realized, which solves the problem of poor impact resistance of pure PMMA materials and achieves the effect of protecting the internal components and appearance of the headlights.

[0092] In this embodiment, the thickness of the toughened PMMA film is 0.375 mm to 0.5 mm, for example, 0.4 mm, 0.45 mm, etc.

[0093] Example 3:

[0094] This embodiment differs from the embodiment 1 in that the membrane structure 1 adopts a composite membrane, which 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. As shown in FIG2 , the method specifically includes the following steps:

[0095] S1: Print the required black pattern on the flat composite film using offset printing technology;

[0096] S2: placing the printed composite film in a pressing mold and pressing it into the desired shape of the headlight outer lens;

[0097] S3: placing the pressed composite film into an injection molding mold, controlling the injection molding mold to close the mold, and injecting PMMA material to complete the injection molding on the outer surface of the composite film and form the base layer 2, wherein the control temperature of the injection molding mold during the molding process is 90°C to 110°C, for example, 100°C, and the temperature of the injected PMMA material is 200°C to 250°C, for example, 210°C, 220°C, 230°C, 240°C, wherein the optimal selection is 225°C; through the above temperature control means, a permeation layer is formed between the composite film and the base layer 2 after the injection molding to provide adhesion and ensure that the materials are not delaminated, and the thickness of the permeation layer is preferably 10μm to 50μm;

[0098] S4: After taking the product out of the injection molding mold, it is placed in an annealing device for annealing treatment;

[0099] S5: After the product has cooled, take it out of the annealing equipment.

[0100] The preparation method of the present invention changes the idea of ​​the existing IML injection molding process that generally requires the same materials to prepare products. By using a composite film, the injection molding of PMMA+PMMA+PC composite materials is realized, which solves the problem of poor toughness and collision resistance of pure PMMA materials. The impact test results show that the impact strength of the present invention is 2 times higher than that of pure PMMA materials, which meets the use requirements of headlights and achieves the effect of protecting the internal components and appearance of the headlights, as well as protecting pedestrians.

[0101] This embodiment also provides an outer lens for a headlight, comprising 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 PMMA film, and the PC film are all arranged on the outer lens for a headlight and are arranged in sequence along the inward direction of the outer lens for the headlight, as shown in FIG2 .

[0102] Example 4:

[0103] The membrane structure 1 in this embodiment still uses a composite film. The difference from Example 3 is that the composite film is formed by bonding a toughened PMMA film and a PC film. 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 use requirements of vehicle headlights.

[0104] Example 5:

[0105] This embodiment provides a method for preparing an outer lens of a vehicle lamp. Unlike Example 1, the film structure 1 in this embodiment is made of a PMMA film, and the base layer 2 is made of a PC material. As shown in FIG3 , the method specifically includes the following steps:

[0106] S1: Print the desired black pattern on the flat PMMA film using the offset printing technique;

[0107] S2: Placing the printed PMMA film in a pressing mold and pressing it into the desired headlight outer lens shape;

[0108] S3: Place the pressed PMMA film into an injection molding mold, control the injection molding mold to close the mold, and inject PC material to complete the injection molding on the side of the PMMA film with the black pattern printed on it to form a PC material base layer 2. The PMMA film is located on the outer side of the base layer 2, as shown in Figure 3. The controlled temperature during the injection molding process is 70℃ to 120℃, for example, 80℃, 90℃, 100℃, 110℃, and the optimal choice is 100℃. The temperature of the injected PC material is 250℃ to 320℃, for example, 260℃, 270℃, 280℃, 290℃, 300℃, 310℃, and the optimal choice is 285℃. After the PMMA film is injection molded by the above temperature control means, a permeation layer is formed between the PC material base layer 2 to provide adhesion and ensure that the materials are not delaminated. The thickness of the permeation layer is preferably 10μm to 50μm, for example, 20μm, 30μm, 40μm, etc.

[0109] S4: Take the product out of the injection molding mold and place it in an annealing device for annealing;

[0110] S5: After the product annealing is completed, it is taken out from the annealing equipment.

[0111] Example 6:

[0112] This embodiment provides a preparation method suitable for the outer lens of a vehicle lamp. Unlike Example 5, the membrane structure 1 in this embodiment adopts a toughened PMMA film, and the base layer 2 is made of PC material, which can also achieve the effects of the present invention.

[0113] Example 7:

[0114] This embodiment provides a method for preparing an outer lens for a headlight. The film structure 1 is a composite film formed by laminating a PMMA film and a PC film. Unlike Example 3, the base layer 2 is made of PC material. As shown in FIG4 , the method specifically includes the following steps:

[0115] S1: Print the required black pattern on the flat composite film using offset printing technology;

[0116] S2: placing the printed composite film in a pressing mold and pressing it into the desired shape of the headlight outer lens;

[0117] S3: Place the pressed composite film into an injection molding mold, control the injection molding mold to close the mold, and inject PC material to complete the injection molding on the inner side of the composite film and form the base layer 2, wherein the control temperature during the injection molding process of the injection molding mold is 70°C to 120°C, for example, 80°C, 90°C, 100°C, 110°C, wherein the optimal selection is 100°C. The temperature of the injected PC material is 250°C to 320°C, for example, 260°C, 270°C, 280°C, 290°C, 300°C, 310°C, wherein the optimal selection is 285°C; through the above temperature control means, 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 are not delaminated, and the thickness of the permeation layer is preferably 10μm to 50μm;

[0118] S4: After taking the product out of the injection molding mold, it is placed in an annealing device for annealing treatment;

[0119] S5: After the product has cooled, take it out of the annealing equipment.

[0120] The present invention realizes injection molding of PMMA+PC+PC composite materials by using a composite film, provides good UV resistance and scratch resistance, and solves the problems of easy scratching and UV sensitivity of pure PC materials. After using the composite film, the scratch resistance can fully meet the use requirements of headlights and meet the strict regulatory requirements of various countries, such as FMVSS108, SAE J1383, etc., achieving the effect of protecting the internal components and appearance of the headlights and protecting pedestrians.

[0121] This embodiment also provides an outer lens of a 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 outer lens of the headlight and are arranged in sequence along the outward direction of the outer lens of the headlight, as shown in Figure 4.

[0122] Example 8:

[0123] This embodiment provides a method for preparing an exterior lens for a headlight. Unlike Example 7, the composite film is formed by laminating a toughened PMMA film and a PC film, yet still achieves the effects of the present invention. The present invention's preparation method changes the conventional IML injection molding process, which typically requires the same materials to produce a product. By using a composite film, it achieves injection molding of a composite material, addressing the poor UV and scratch resistance of pure PC materials and protecting both the internal components and exterior of the headlight.

[0124] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0125] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A method for preparing an outer lens of a vehicle lamp, characterized in that: The steps include: S1: Printing the required black pattern on the membrane structure (1) by mimeographing technology; S2: placing the printed film structure (1) in a pressing mold and pressing it into a desired outer lens shape; S3: placing the pressed membrane structure (1) into an injection molding mold, controlling the injection molding mold to close the mold and injecting a base material to form a base layer (2) on the membrane structure (1); S4: taking out the product from the injection molding mold and placing it in an annealing device for annealing; S5: After the product is annealed, it is taken out from the annealing equipment.

2. The method for preparing an outer lens for a vehicle lamp according to claim 1, characterized in that: The base layer (2) is made of PMMA material, and the membrane structure (1) is made of any of the following: A PC film, wherein the PC film is arranged on the inner side of the base layer (2); Toughened PMMA film; A first composite film formed by attaching a PC film to a PMMA film, wherein the first composite film is arranged on the inner side of the base layer (2); The second composite film is formed by attaching the PC film to the toughened PMMA film.

3. The method for preparing an outer lens for a vehicle lamp according to claim 1, characterized in that: The base layer (2) is made of PC material, and the membrane structure (1) is made of any of the following: A PMMA film, wherein the PMMA film is arranged on the outside of the base layer (2); A toughened PMMA film, wherein the toughened PMMA film is arranged on the outside of the base layer (2); A first composite film formed by attaching a PMMA film to the outside of a PC film, wherein the first composite film is arranged on the outside of the base layer (2); The toughened PMMA film is attached to the outer side of the PC film to form a second composite film.

4. The method for preparing an outer lens for a vehicle lamp according to claim 2 or 3, characterized in that: The thickness of the toughened PMMA film is 0.375 mm to 0.5 mm.

5. A method for preparing an outer lens of a vehicle lamp, characterized in that: The steps include: S1: using high temperature PMMA material to injection mold the base layer (2) into the desired outer lens shape; S2: placing the molded base layer (2) into a silicone injection mold; S3: Injecting silicone into the silicone injection mold so as to form an adhesion layer of silicone material on the inner side of the base layer (2), and completing the first curing in the silicone injection mold; S4: After taking the product out of the silicone injection mold, put it into the curing equipment for the second curing; S5: After the product has cooled, take the finished product out of the curing equipment.

6. A vehicle lamp outer lens, characterized in that: The invention comprises a membrane structure (1) and a base layer (2). The membrane structure (1) is printed with a required black pattern by means of an offset printing technique and then placed in a pressing mold to be pressed into a required outer lens shape. The pressed membrane structure (1) having the outer lens shape is then placed in an injection molding mold. The injection molding mold is controlled to close and the base material is injected to complete the injection molding on the membrane structure (1) and form the base layer (2).

7. A vehicle lamp outer lens, characterized in that: The invention comprises an adhesion layer and a base layer (2), wherein the base layer (2) is injection molded into a desired outer lens shape using a high-temperature PMMA material, and the molded base layer (2) is placed in a silicone injection mold, the silicone injection mold is controlled to close the mold and silicone is injected into the silicone injection mold so that an adhesion layer of silicone material is formed on the inner side surface of the base layer (2), and the first curing is completed in the silicone injection mold, and the product is taken out and placed in a curing device for a second curing.

8. The preparation method according to any one of claims 1 to 5 or the vehicle lamp outer lens according to any one of claims 6 to 7, characterized in that: A permeable layer is formed between the membrane structure (1) and the substrate layer (2) or between the substrate layer (2) and the adhesion layer to provide adhesion.

9. The preparation method or the vehicle lamp outer lens according to claim 8, characterized in that: The thickness of the permeation layer is 10 μm to 50 μm.

10. A vehicle lamp, characterized in that: The vehicle lamp comprises a housing and an outer lens of a vehicle lamp according to any one of claims 6 to 9 mounted on the housing.

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