Car lamp outer lens, car lamp and preparation method suitable for car lamp outer lens

Abstract

The invention relates to the technical field of automobile lamps, and provides an automobile lamp outer lens, an automobile lamp and a preparation method suitable for the automobile lamp outer lens, and the method comprises the following steps: S1, printing a required black pattern on a film structure through a mimeograph technology; s2, the film structure obtained after mimeographing is placed in a pressing mold to be pressed into a needed outer lens shape; s3, the pressed film structure is put into an injection molding mold, the injection molding mold is controlled to be closed, and a substrate material is injected to form a substrate layer on the film structure; s4, the product is taken out of the injection molding mold and placed in annealing equipment to be subjected to annealing treatment; and S5, the product is taken out from the annealing equipment after being annealed. Compared with the prior art, the problems that extra hardening coating needs to be carried out and a pure PMMA material is poor in impact resistance are solved, the cost is low, and the light transmittance is high.

Description

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 light is a transparent protective structure located on the outermost part of the light. It plays multiple roles, such as transmitting light, isolating from the external environment, and protecting the internal components of the lamp cavity.

[0003] PC is a common outer lens material. Its Chinese name is polycarbonate, also known as PC plastic. Due to its scratch-prone and UV-sensitive properties, it needs to be hardened. However, a large amount of solvent is required during the hardening process, and the solvent will eventually be discharged in the form of volatile organic matter, which is not conducive to environmental protection. Compared with PC, PMMA material can filter UV rays, is scratch-resistant, and has high light transmittance, but PMMA material has poor toughness and is not impact-resistant, so it cannot be directly used for the outer lens of car lights. Summary of the invention

[0004] In view of the defects in the prior art, an 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.

[0005] According to the present invention, a method for preparing an outer lens of a vehicle lamp comprises the following steps:

[0006] S1: Print the required black pattern on the membrane structure by mimeograph technology;

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

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

[0009] S4: taking out the product from the injection molding mold and placing it in an annealing device for annealing;

[0010] S5: After the product is annealed, it is taken out from the annealing equipment.

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

[0012] A PC film, wherein the PC film is arranged on the inner side of the base layer;

[0013] Toughened PMMA film;

[0014] 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;

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

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

[0017] A PMMA film, wherein the PMMA film is arranged on the outside of the base layer;

[0018] A toughened PMMA film, wherein the toughened PMMA film is arranged on the outside of the base layer;

[0019] 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;

[0020] The toughened PMMA film is attached to the outer side of the PC film to form a second composite film.

[0021] According to the present invention, a method for preparing an outer lens of a vehicle lamp comprises the following steps:

[0022] S1: A substrate layer that is injection molded into the desired outer lens shape using high temperature PMMA material;

[0023] S2: placing the molded substrate layer into a silicone injection mold;

[0024] 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 the first curing in the silicone injection mold;

[0025] S4: After taking the product out of the silicone injection mold, put it into the curing equipment for the second curing;

[0026] S5: After the product has cooled, take the finished product out of the curing equipment.

[0027] 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 inject the base material to complete the injection molding on the membrane structure and form the base layer.

[0028] According to the present invention, a headlight outer lens includes a membrane structure and a base layer. The base layer is injection molded into a desired outer lens shape using a high-temperature PMMA material, and the molded base layer 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 of the base layer. 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.

[0029] Preferably, a permeation 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] A vehicle lamp provided according to the present invention comprises a shell and the vehicle lamp outer lens installed on the shell.

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

[0033] 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, and prepares an automotive headlight outer lens that does not require additional coating to make up for performance defects. The film structure can adopt 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, 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.

[0034] 2. The present invention uses PC film to complete the in-mold injection molding or composite film to complete the in-mold injection molding process, 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 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.

[0035] 3. The present invention eliminates the process of additional coating by using a PMMA and PC film composite material, reduces the production cost of the outer lens of the headlight, and improves the light transmittance compared to the original PC material plus hardening coating process, achieving a higher light source utilization rate.

[0036] 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, reduces the cost of producing the outer lens of the headlight, and has more obvious process advantages than the original PC material plus hardened coating. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0038] Figure 1 is a schematic cross-sectional view of the outer lens of the vehicle lamp in Example 1;

[0039] Figure 2 is a schematic cross-sectional view of the outer lens of the vehicle lamp in Example 4;

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

[0041] Figure 4 Schematic cross-sectional view of the outer lens of the vehicle lamp in Example 8.

[0042] The figure shows:

[0043] Membrane structure 1

[0044] Base layer 2 DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments 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 of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0046] Basic Example:

[0047] The present invention provides a preparation method for an outer lens of a vehicle lamp, which adopts an IML injection molding process. The Chinese name of IML (InMolding Label) is in-mold insert injection 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. Since the ink is sandwiched in the middle, the surface of the product can be prevented from being scratched, the color can be kept bright for a long time, and it is not easy to fade, and the friction resistance effect is obtained. The method comprises the following steps:

[0048] S1: Printing the required black pattern on the membrane structure 1 by mimeograph technology;

[0049] S2: placing the mimeographed film structure 1 in a pressing mold and pressing it into a desired outer lens shape;

[0050] 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;

[0051] S4: taking out the product from the injection molding mold and placing it in an annealing device for annealing;

[0052] S5: After the product is annealed, it is taken out from the annealing equipment.

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

[0054] PC film, the PC film is arranged on the inner side of the base layer 2;

[0055] PMMA film;

[0056] Toughened PMMA film;

[0057] 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;

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

[0059] or

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

[0061] A PMMA film, wherein the PMMA film is arranged on the outside of the base layer 2;

[0062] A toughened PMMA film, wherein the toughened PMMA film is arranged on the outside of the base layer 2;

[0063] 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;

[0064] The toughened PMMA film is attached to the outer side of the PC film to form a second composite film.

[0065] The present invention also provides a method for preparing an outer lens of a vehicle lamp, comprising the following steps:

[0066] S1: using high-temperature PMMA material to injection mold a substrate 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.;

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

[0068] 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 and reduce the time of occupying the mold, so as to improve molding efficiency and reduce costs.

[0069] 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.

[0070] S5: After the product is cooled, the finished product is taken out from the curing equipment, and the curing equipment is, for example, a curing furnace.

[0071] 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 thermosetting Silicone is injection molded. The thickness of the silicone needs to be limited to less than 50 mm, and the mold requires special design and surface treatment, such as lining the inside of the mold molding cavity with a layer of Teflon.

[0072] Silicone also has an anti-fog effect and can replace the anti-fog step in the existing technology process, solving the problem of needing additional hardening coating, achieving the environmentally friendly process effect of eliminating the emission of volatile organic compounds during coating, while reducing the cost of producing the outer lens of the headlight.

[0073] 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 a required outer lens shape. The pressed membrane structure 1 having an outer lens shape is placed in an injection molding mold, and the injection molding mold is controlled to close and inject the base material to complete the injection molding on the membrane structure 1 and form the base layer 2.

[0074] The present invention also provides an outer lens for a headlight, comprising a membrane structure 1 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, wherein the adhesion layer is a non-membrane structure and is thicker than the membrane structure 1, and the adhesion layer is equivalent to forming an additional base with a certain thickness on the base layer 2.

[0075] A permeable layer is formed between the membrane structure 1 and the base layer 2 in the present invention, and a permeable layer is also formed between the base layer 2 and the adhesion layer. The permeable layer can provide adhesion and ensure that the materials are not delaminated. The thickness of the permeable layer is 10 μm to 50 μm.

[0076] The present invention also provides a vehicle lamp, comprising a shell and an outer lens of the vehicle lamp mounted on the shell.

[0077] Embodiment 1:

[0078] 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 comprises the following steps:

[0079] S1: Print the required black pattern on the flat PC film by offset printing technology;

[0080] S2: placing the printed PC film in a pressing mold and pressing it into the required shape of the outer lens of the headlight;

[0081] S3: Put the pressed PC film into the injection molding mold, control the injection molding mold to close the mold, and inject 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. The PC film is located on the inner side of the base layer 2. Figure 1 As shown, the controlled temperature during the injection molding process is 80°C to 100°C, such as 85°C, 90°C, 95°C, etc., and the temperature of the injected PMMA material is 240°C to 260°C, such as 245°C, 250°C, 255°C, etc.; after the injection molding is completed by the above temperature control means, a permeation layer is formed between the PC film and the base layer 2 of the PMMA material to provide adhesion and ensure that there is no stratification between the materials. The thickness of the permeation layer is preferably 10μm to 50μm, such as 20μm, 30μm, 40μm, etc.;

[0082] S4: taking out the product from the injection molding mold and placing it in an annealing device for annealing;

[0083] S5: After the product is annealed, it is taken out from the annealing equipment.

[0084] 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 realized 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, which is made of silicone resin as the basic component and filled with mica powder, asbestos, glass fiber or glass cloth, etc., and is made by precision compression molding or lamination. 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, relative to a single-layer film.

[0085] Specifically, PMMA is a high molecular polymer, also known as acrylic or organic glass, with the advantages of high transparency, low price, and easy machining. PC is a high molecular polymer containing carbonate groups in its molecular chain. Due to the special structure of polycarbonate, it has become the fastest growing general engineering plastic among the five major engineering plastics.

[0086] Embodiment 2:

[0087] This embodiment provides a preparation method for an outer lens of a vehicle lamp. The difference from the embodiment 1 is that the film structure 1 adopts a toughened PMMA film, and the toughened PMMA film is made of a PMMA material with special toughness and impact resistance. The method specifically comprises the following steps:

[0088] S1: Print the required black pattern on the flat toughened PMMA film by mimeograph technology;

[0089] S2: placing the toughened PMMA film after printing in a pressing mold and pressing it into the required shape of the outer lens of the headlight;

[0090] 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 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 controlled during the injection molding process is 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;

[0091] S4: After taking out the product from the injection molding mold, put it into the annealing equipment for annealing treatment;

[0092] S5: After the product is cooled, take out the finished product from the annealing equipment.

[0093] The preparation method of the present invention changes the idea of ​​the prior art that the IML injection molding process generally requires the same materials to complete the product preparation. By using the toughened PMMA film, the injection molding of the toughened PMMA + non-toughened PMMA composite material is realized, 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 car lamp.

[0094] 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.

[0095] Embodiment 4:

[0096] The difference between this embodiment and embodiment 1 is that the membrane structure 1 adopts a composite membrane, and the composite membrane 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. Figure 2 As shown, the method specifically includes the following steps:

[0097] S1: Printing the required black pattern on the flat composite film by offset printing technology;

[0098] S2: placing the printed composite film in a pressing mold and pressing it into the desired shape of the outer lens of the headlight;

[0099] 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 side of the composite film and form a base layer 2, wherein the control temperature during the injection molding process of the injection molding mold 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 choice is 225°C; a permeation layer is formed between the composite film and the base layer 2 after the injection molding by the above temperature control means to provide adhesion and ensure that the materials are not delaminated, and the thickness of the permeation layer is preferably 10μm to 50μm;

[0100] S4: After taking out the product from the injection molding mold, put it into the annealing equipment for annealing treatment;

[0101] S5: After the product is cooled, take out the finished product from the annealing equipment.

[0102] The preparation method of the present invention changes the idea of ​​the prior art that the IML injection molding process generally requires the same materials to complete the preparation of products. The injection molding of PMMA+PMMA+PC composite materials is realized by using a composite film, 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, and protecting pedestrians.

[0103] This embodiment also provides an outer lens of a headlight, including a composite film and a base layer 2, wherein the composite film is formed by laminating a PMMA film and a PC film, wherein the PMMA film is made of PMMA Foil material, and the PC film is made of PC material, wherein the base layer 2, the PMMA film, and the PC film are all arranged on the outer lens of the headlight and are arranged in sequence in the direction inward of the outer lens of the headlight, such as Figure 2 shown.

[0104] Embodiment 5:

[0105] The membrane structure 1 in this embodiment still uses a composite membrane. The difference from Example 4 is that the composite membrane 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.

[0106] Embodiment 6:

[0107] This embodiment provides a method for preparing an outer lens of a vehicle lamp. Different from the embodiment 1, the film structure 1 in this embodiment is made of PMMA film, and the base layer 2 is made of PC material, such as Figure 3 As shown, the specific steps include:

[0108] S1: Print the required black pattern on the flat PMMA film by using the offset printing technology;

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

[0110] S3: Put the pressed PMMA film into the 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, and the PMMA film is located on the outer side of the base layer 2, such as Figure 3 As shown, the controlled temperature during the injection molding process is 70°C to 120°C, such as 80°C, 90°C, 100°C, and 110°C, and the optimal choice is 100°C. The temperature of the injected PC material is 250°C to 320°C, such as 260°C, 270°C, 280°C, 290°C, 300°C, and 310°C, and the optimal choice is 285°C. After the injection molding is completed by the above temperature control means, a permeation layer is formed between the PMMA film and the base layer 2 of the PC material to provide adhesion and ensure that there is no stratification between the materials. The thickness of the permeation layer is preferably 10μm to 50μm, such as 20μm, 30μm, 40μm, etc.

[0111] S4: taking out the product from the injection molding mold and placing it in an annealing device for annealing;

[0112] S5: After the product is annealed, it is taken out from the annealing equipment.

[0113] Embodiment 7:

[0114] This embodiment provides a preparation method suitable for the outer lens of a vehicle lamp. Different from Embodiment 6, the film 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 effect of the present invention.

[0115] Embodiment 8:

[0116] This embodiment provides a method for preparing an outer lens of a vehicle lamp. The film structure 1 is a composite film, which is formed by laminating a PMMA film and a PC film. The difference from the embodiment 4 is that the base layer 2 is made of PC material. Figure 4 As shown, the method specifically includes the following steps:

[0117] S1: Printing the required black pattern on the flat composite film by offset printing technology;

[0118] S2: placing the printed composite film in a pressing mold and pressing it into the desired shape of the outer lens of the headlight;

[0119] S3: Put the pressed composite film into the 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 is 70℃~120℃, for example, 80℃, 90℃, 100℃, 110℃, wherein the best choice is 100℃. The temperature of the injected PC material is 250℃~320℃, for example, 260℃, 270℃, 280℃, 290℃, 300℃, 310℃, wherein the best choice is 285℃; 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~50μm;

[0120] S4: After taking out the product from the injection molding mold, put it into the annealing equipment for annealing treatment;

[0121] S5: After the product is cooled, take out the finished product from the annealing equipment.

[0122] The present invention realizes injection molding of PMMA+PC+PC composite material by using composite film, provides good UV resistance and scratch resistance, solves the problems of easy scratching and ultraviolet sensitivity of pure PC material, and 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 American standard FMVSS108, SAE J 1383 and other requirements, and achieves the effect of protecting the internal components and appearance of the headlights and protecting pedestrians.

[0123] This embodiment also provides an outer lens of a headlight, comprising a composite film and a base layer 2, wherein the composite film is formed by laminating a PMMA film and a PC film, wherein the PMMA film is made of a PMMA Foil material, and the PC film is made of a PC material, wherein 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 in the outward direction of the outer lens of the headlight, such as Figure 4 shown.

[0124] Embodiment 9:

[0125] This embodiment provides a preparation method suitable for the outer lens of a headlight. Different from the embodiment 8, the composite film is formed by bonding a toughened PMMA film and a PC film, which can also achieve the effect of the present invention. 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 product preparation. By using the composite film, the injection molding of the composite material is realized, the problem of poor UV resistance and scratch resistance of pure PC materials is solved, and the effect of protecting the internal components and appearance of the headlight is achieved.

[0126] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0127] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

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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