Touchpad cover plate for electronic device, touchpad for electronic device, and electronic device

Abstract

This application provides a touchpad cover, comprising: a substrate and a topcoat layer formed on the surface of the substrate; the surface of the topcoat layer has a loop-like texture structure formed by multiple micron-level folds; the substrate includes a top layer, an intermediate layer, and a bottom layer stacked sequentially; the top layer is connected to the topcoat layer; the top layer and the bottom layer independently include resin and reinforcing material. This application also provides a touchpad including the touchpad cover and an electronic device including the touchpad. On the one hand, the substrate layer includes a bottom layer, an intermediate layer, and a top layer structure, which can reduce the weight of the touchpad by lightening the intermediate layer without affecting the functionality of the touch function layer under the touchpad cover; on the other hand, the topcoat layer with a loop-like texture structure formed by multiple micron-level folds is not affected by the lightening of the substrate layer, can obtain a rich appearance effect, and the topcoat layer has a skin-friendly feel and a certain degree of anti-fouling effect.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a touchpad cover for electronic devices, a touchpad for electronic devices, and an electronic device. Background Technology

[0002] A touchpad is an input device widely used in electronic devices such as laptops and tablets, and can be considered a replacement for a mouse. The touchpad cover is the material on the surface of the touchpad, primarily serving to protect the touch-sensitive layer and enhance its appearance. Currently, laptops, tablets, and other electronic devices generally use cover glass (CG glass) as the touchpad cover. This is achieved through processes such as laser etching, AG etching, screen printing, and AF coating to obtain a cover material with a smooth feel. However, using glass as a touchpad cover is not conducive to the lightweight design of electronic devices. Summary of the Invention

[0003] Based on this, this application provides a touchpad cover for electronic devices, a touchpad for electronic devices, and an electronic device. The touchpad cover for electronic devices provided by this application has an excellent appearance and skin-friendly feel, and is also conducive to the lightweight design of electronic devices.

[0004] One embodiment of this application provides a touchpad cover for an electronic device, comprising:

[0005] Substrate and topcoat layer formed on the surface of the substrate;

[0006] The surface of the topcoat layer has a loop-like texture structure formed by multiple micron-level folds;

[0007] The substrate comprises a top layer, an intermediate layer, and a bottom layer stacked sequentially.

[0008] The surface layer is connected to the topcoat layer;

[0009] The top layer and the bottom layer each independently comprise resin and reinforcing material.

[0010] The touchpad cover provided in this application uses a substrate comprising a top layer, an intermediate layer, and a bottom layer as the main material. A topcoat layer with a loop-like texture structure formed by multiple micron-level folds is formed on its surface. The top layer and the bottom layer independently comprise resin and reinforcing materials. On one hand, the substrate layer's structure of a bottom layer, intermediate layer, and top layer allows for weight reduction of the touchpad by lightening the intermediate layer without affecting the functionality of the touch layer beneath the cover. On the other hand, the topcoat layer with its loop-like texture structure formed by multiple micron-level folds is unaffected by the substrate layer's weight reduction, achieving a rich aesthetic effect. Furthermore, this topcoat layer has a skin-friendly feel and a certain degree of dirt resistance.

[0011] In some specific implementations, the intermediate layer has a perforated structure in its planar structure, or the intermediate layer is made of foam resin. The perforated structure of the intermediate layer or the use of foam resin as the intermediate layer can further reduce the weight of the touchpad cover. Simultaneously, the presence of the bottom layer can protect the touch function layer, and the presence of the top layer can achieve the appearance effect and other functions of the topcoat, such as a skin-friendly feel and resistance to dirt.

[0012] In some specific implementations, the topcoat layer is formed from a topcoat composition comprising: 40 wt% to 60 wt% aliphatic polyester; 8 wt% to 20 wt% acrylate or polyurethane; 1 wt% to 3 wt% photoinitiator; 20 wt% to 30 wt% monomer selected from diols or low-functional esters; and 2 wt% to 10 wt% additives. The topcoat composition, through three curing processes, forms a topcoat layer with a loop-like texture structure on the surface formed by multiple micron-level folds. This allows it to remain unaffected by the hollow structure of the substrate interlayer or the impact of foam resin on the substrate surface, giving the touchpad cover a good appearance, a skin-friendly feel, and resistance to dirt.

[0013] In some specific implementations, the touch panel cover may also include one or more of the following: a primer layer for increasing the adhesion between the substrate and the topcoat layer; a color paint / ink layer for changing the color; an inner texture layer for achieving light and shadow and texture effects; a coating layer for achieving a metallic texture; and a varnish layer for increasing brightness, thereby obtaining more aesthetic effects.

[0014] This application also provides a touchpad including the cover plate described in the above technical solution and an electronic device including the touchpad, which has low weight, good appearance and skin-friendly touch, and can improve the user experience. Attached Figure Description

[0015] Figure 1 A schematic diagram of a laptop touchpad provided in an embodiment of this application;

[0016] Figure 2 A schematic diagram of the stacked structure of the touchpad cover provided in the first embodiment of this application;

[0017] Figure 3 This is an exploded structural diagram of the cover plate provided in the first embodiment of this application;

[0018] Figure 4 Electron micrographs of the topcoat layer of the cover plate provided in the embodiments of this application;

[0019] Figure 5 This is a schematic diagram of the structure of the cover plate provided in the second embodiment of this application;

[0020] Figure 6 This is a schematic diagram of the structure of the cover plate provided in the third embodiment of this application;

[0021] Figure 7 This is a schematic diagram of the structure of the cover plate provided in the fourth embodiment of this application. Detailed Implementation

[0022] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0023] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," etc., mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The terms "connected," "linked," etc., are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Glass, used as a cover for electronic devices such as laptop touchpads, suffers from fragility and weight. To reduce weight, polycarbonate / polyester (PC / PET) film can be used instead of glass. For example, PC / PET film can be processed through UV embossing, screen printing, optional AF coating, and cutting (ordinary Mylar / Mylar with AF coating) to create the touchpad cover material. Alternatively, it can be prepared by sequentially coating with primer, color paint, and rubberized paint (commonly known as rubberized Mylar). While these resin covers reduce the weight of the touchpad to some extent, their structure hinders further weight reduction in electronic devices.

[0025] Based on this, the applicant provides a touch panel cover for an electronic device, comprising: a substrate and a topcoat layer formed on the surface of the substrate;

[0026] The surface of the topcoat layer has a loop-like texture structure formed by multiple micron-level folds;

[0027] The substrate comprises a top layer, an intermediate layer, and a bottom layer stacked sequentially.

[0028] The surface layer is connected to the topcoat layer;

[0029] The top layer and the bottom layer are independently formed of resin and reinforcing material.

[0030] The electronic devices described in this application include, but are not limited to, electronic devices with touchpads such as laptops and tablets. The touchpad cover and touchpad described in this application will be described below using a laptop as an example.

[0031] See Figure 1 , Figure 1 This is a schematic diagram of a laptop touchpad provided in an embodiment of this application. 10 is a laptop, and 11 is a touchpad. The touchpad 11 is located within the laptop 10 and includes a touchpad cover 100 and a touch function layer (not shown) disposed below the touchpad cover 100 and housed within the laptop casing. The touchpad 11 can replace a mouse for input.

[0032] See Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the stacked structure of the touchpad cover provided in the first embodiment of this application. Figure 3 This is an exploded structural diagram of the cover plate provided in the first embodiment of this application, wherein 100 is the cover plate, 101 is the substrate, 1011 is the bottom layer, 1012 is the intermediate layer, 1013 is the top layer, and 102 is the topcoat layer.

[0033] In some specific implementations, the substrate 101 includes resin and reinforcing materials, which can reduce the weight of the cover plate 100. Specifically, the resin includes, but is not limited to, polyamide (PA), polycarbonate (PC), epoxy resin, acrylonitrile butadiene styrene copolymer (ABS), polyether ether ketone (PEEK), etc., and the reinforcing materials include, but are not limited to, inorganic particles, inorganic sheet materials, inorganic fiber materials, etc., preferably inorganic fiber materials, including, but not limited to, glass fiber, metal fiber, metal oxide fiber, or non-metal oxide fiber, etc., preferably glass fiber. When the amount of reinforcing material is higher than 50 wt%, the weight reduction effect is not significant; when the amount of reinforcing material is lower than 30 wt%, the strength of the cover plate is difficult to guarantee. Therefore, its amount is between 30 wt% and 50 wt%, preferably 35 wt% to 45 wt%.

[0034] In some specific implementations, the substrate 101 is preferably fiberglass cloth, i.e., glass fiber reinforced resin, wherein the glass fibers can be long or short. In some specific implementations, the diameter of the glass fibers is preferably 7μm to 15μm, more preferably 12μm to 15μm; the larger the diameter of the glass fibers, the better the stiffness of the fiberglass board. In some specific implementations, the arrangement of the glass fibers in the resin can be unidirectional, i.e., arranged in a specific direction, such as warp or weft, which has high stiffness in that specific direction; or it can be woven, i.e., interlaced in the warp and weft directions, which can obtain high performance in both the warp and weft directions.

[0035] In some specific implementations, the substrate 101 includes a top layer 1013, an intermediate layer 1012, and a bottom layer 1011 stacked sequentially. The top layer 1013, the intermediate layer 1012, and the bottom layer 1011 are independently selected from single or multiple layers of fiberglass cloth. In other embodiments, the top layer 1013, the intermediate layer 1012, and the bottom layer 1011 may also be independently formed from resin and other reinforcing materials.

[0036] To reduce the weight of the cover plate 100, the intermediate layer 1012 has a perforated structure in its planar structure, for example, the intermediate layer 1012 has a honeycomb structure in its planar structure. See [link to documentation]. Figure 3 The bottom layer 1011 is used to protect the touch function components under the cover plate 100. The middle layer 1012 has a hollow or honeycomb structure in its planar structure to reduce weight while maintaining good rigidity. The top layer 1013 is used to provide support for the topcoat layer 102 and other components on the cover plate 100, thereby obtaining a lightweight, rigid cover plate with good appearance and feel.

[0037] In some specific implementations, when the bottom layer 1011 and the top layer 1013 are single or multiple layers of fiberglass cloth, and the middle layer 1012 is a single or multiple layer of fiberglass cloth with a hollow or honeycomb structure, the glass fibers of adjacent layers can be arranged at 30 to 60 degrees and in a clockwise direction when the fiberglass cloth layers are stacked. For example, the fiberglass cloth layers can be arranged in the manner of 0°, 45°, 90°, 135°, etc., which is beneficial to improving the stiffness of the cover plate 100 in all directions.

[0038] In some specific implementations, when the bottom layer 1011 and the top layer 1013 are single-layer or multi-layer fiberglass cloth, and the middle layer 1012 is a hollow or honeycomb-structured single-layer or multi-layer fiberglass cloth, it can be prepared according to the following method:

[0039] The fiberglass cloth of the middle layer 1012 is pre-cut into a hollow structure or a honeycomb structure. Then, the fiberglass cloth prepreg of the bottom layer 1011, the fiberglass cloth prepreg of the middle layer 1012 and the fiberglass cloth prepreg of the top layer 1013 are stacked and hot-pressed to obtain the substrate.

[0040] Alternatively, the fiberglass prepreg of the middle layer 1012 can be laminated and hot-pressed to form a hollow or honeycomb structure by cutting or CNC machining. Then, the fiberglass prepreg of the bottom layer 1011, the fiberglass of the middle layer 1012, and the fiberglass prepreg of the top layer 1013 can be laminated and hot-pressed to form the substrate.

[0041] This application does not impose any special restrictions on the cutting and hot pressing methods described herein; any method known to those skilled in the art is acceptable.

[0042] In other specific implementations, to reduce the weight of the cover plate 100, the intermediate layer 1012 is made of foam resin. This application does not impose any particular limitation on the type of foam resin; it can be polyurethane foam, polyamide foam, etc., which have lighter weight and higher strength.

[0043] When the intermediate layer 1012 is foam resin, the top layer 1013, intermediate layer 1012, and bottom layer 1011 can be directly bonded together with an adhesive, or the top layer, foam resin composition, and bottom layer can be foamed after application, directly forming the foam resin composition in situ between the top layer 1013 and the bottom layer 1011. This application does not impose any special limitations on the foam resin composition; a foaming agent can be added to a composition including a base resin, solvent, etc.

[0044] In some specific implementations, the thickness of the substrate 101 is preferably 0.5 mm to 1 mm. This application does not have any special restrictions on the thickness of the bottom layer 1011, the intermediate layer 1012 and the top layer 1013, as long as the weight of the cover plate 100 can be reduced while protecting the touch function layer.

[0045] Topcoat layer 102 is used to provide a good appearance and feel to cover plate 100. The surface of topcoat layer 102 has a loop-like textured structure formed by multiple micron-level folds. See [link to relevant documentation]. Figure 4 , Figure 4 The electron microscope image of the topcoat layer of the cover plate provided in this application embodiment shows that it has multiple micron-sized wrinkles, each wrinkle forming a loop-like texture structure. In some specific implementations, the height of each wrinkle is determined by the film thickness, generally 10 μm to 30 μm, and the center distance between adjacent wrinkles is preferably 5 μm to 15 μm. On the one hand, the topcoat layer with a loop-like texture structure formed by multiple micron-sized wrinkles can provide a skin-friendly feel; on the other hand, it can reduce the graininess caused by the substrate with a hollow structure. In some specific implementations, the thickness of the topcoat layer is 25 μm to 50 μm, preferably 30 μm to 45 μm, and more preferably 35 μm to 40 μm.

[0046] In some specific implementations, the topcoat layer is formed of a topcoat composition, specifically, the topcoat composition includes:

[0047] 40wt% to 60wt% aliphatic polyester;

[0048] 8wt% to 20wt% acrylate or polyurethane;

[0049] 1 wt% to 3 wt% of photoinitiator;

[0050] 20wt% to 30wt% of monomers, wherein the monomers are selected from diols or low-functional esters;

[0051] 2wt% to 10wt% of additives.

[0052] The topcoat composition comprises 40wt% to 60wt% aliphatic polyester, which cures on the surface under excimer lamp irradiation, forming multiple micron-sized wrinkles and a loop-like textured structure, providing a skin-friendly feel and stain resistance. This application does not impose any particular limitation on the specific type of aliphatic polyester, as long as it can be cured under an excimer lamp.

[0053] The topcoat composition includes 8 wt% to 20 wt% of acrylate or polyurethane. As a conventional component of the topcoat, the acrylate or polyurethane can enhance the function of the topcoat layer. The appropriate resin can be selected according to the requirements of the topcoat layer. For example, a yellowing-resistant topcoat layer can be made of a yellowing-resistant resin, and a wear-resistant topcoat layer can be made of a high-functionality resin.

[0054] The topcoat composition includes 1 wt% to 3 wt% of a photoinitiator for initiating resin polymerization into a film. In some specific implementations, the photoinitiator includes, but is not limited to, acylphosphide photoinitiators, benzoyl photoinitiators, etc.

[0055] The topcoat composition comprises 20 wt% to 30 wt% of monomers, wherein the monomers are diols or low-functional esters, such as trimethylolpropane triacrylate (TMPTA) and isobornyl acrylate (IBOA). In this application, the introduction of diols or low-functional esters into the topcoat layer can further reduce the impact of the perforated intermediate layer, thereby ensuring the lightweight, appearance, and feel of the cover plate.

[0056] The topcoat composition includes 2 wt% to 10 wt% of additives, which include, but are not limited to, antioxidants, polymerization inhibitors, weather-resistant additives, etc. This application does not have any special restrictions on their types and contents; commonly used antioxidants, polymerization inhibitors, and weather-resistant additives are sufficient.

[0057] The topcoat layer 102 is formed by curing the above-mentioned topcoat composition. Preferably, the topcoat composition undergoes three curing processes to form a topcoat layer with a loop-like texture structure formed by multiple micron-level folds on its surface. Specifically, the three curing processes involve using an energy of 600 mJ / cm².2 ~800mj / cm 2 The first curing is performed using LED lamps with wavelengths of 460nm to 650nm, causing deep curing of the topcoat composition to reach a microgel state. Then, an energy level of 100mJ / cm² is used. 2 ~150mj / cm 2 A second curing process was performed using an excimer lamp with a wavelength of 254 nm. This excimer lamp has relatively weak penetrating power and cannot reach the deep layers of the topcoat composition; it can only induce a rapid surface reaction to form a loop-like micro-texture. Finally, an energy of 800 mJ / cm² was used for curing. 2 ~1000mj / cm 2 A third curing process is performed using a mercury lamp with a wavelength of 300nm to 600nm to completely cure the topcoat composition into a film. In some specific implementations, the curing times for the first, second, and third curing processes are independently 3s to 8s.

[0058] In some specific implementations, to improve the adhesion between the topcoat layer 102 and the substrate 101, the cover plate 100 further includes a primer layer 103 disposed between the topcoat layer 102 and the substrate 101. See also Figure 5 , Figure 5 This is a schematic diagram of the cover plate provided in the second embodiment of this application. Except for the primer layer 103, the rest is similar to that described above, and will not be repeated here.

[0059] The primer layer 103 is used to improve the adhesion between the substrate 101 and the topcoat layer 102. It is a resin with adhesive properties, i.e., formed from a primer layer composition with good adhesive properties. For example, the primer layer 103 can be an epoxy resin or an acrylic resin. Specifically, the primer layer composition includes:

[0060] 50wt% to 60wt% of adhesive resin;

[0061] 2wt% to 10wt% of curing agent and

[0062] 20wt% to 35wt% of solvent.

[0063] The primer composition includes 50 wt% to 60 wt% of adhesive resin, which includes, but is not limited to, epoxy resin or acrylic resin, and is the main component that plays a bonding role.

[0064] The primer composition includes 2 wt% to 10 wt% of a curing agent, which is used to cure the resin into a film. This application does not have any special restrictions on its type; it can be selected according to the type of adhesive resin.

[0065] The primer composition includes 20wt% to 35wt% solvent. This application does not have any particular limitation on the solvent, as long as it can dissolve the adhesive resin to form a solution.

[0066] In some specific implementations, the thickness of the primer layer 103 is 3μm to 5μm.

[0067] This application does not impose any special restrictions on the formation method of the primer layer 103. The primer layer composition is applied to the substrate 101 and cured. The application method includes, but is not limited to, screen printing, roller coating, etc. The curing parameters are related to the curing agent. For example, in heat curing, the curing temperature can be 60-80°C and the time can be 15-30 minutes.

[0068] In some specific implementations, to enhance the appearance of the cover plate 100, a color paint layer 104 can be provided between the substrate and the topcoat layer, see [reference]. Figure 6 , Figure 6 This is a schematic diagram of the structure of the cover plate provided in the third embodiment of this application, wherein 100 is the cover plate, 101 is the substrate, 1011 is the bottom layer, 1012 is the intermediate layer, 1013 is the top layer, 102 is the topcoat layer, 103 is the primer layer, and 104 is the color paint layer. The substrate 101, primer layer 103, and topcoat layer 102 are similar to those described above, and will not be repeated here.

[0069] The color paint layer 104 serves to control the color of the cover plate 100. It is a resin containing colorant and can be formed from a color paint composition. For example, the color paint layer 104 can be a colored epoxy resin, acrylic resin, or polyester. Specifically, the primer layer composition includes:

[0070] 50wt% to 60wt% of base resin;

[0071] 1wt% to 2wt% color paste;

[0072] 2wt% to 10wt% curing agent;

[0073] 20wt% to 30wt% of solvent and

[0074] 2wt% to 10wt% of additives.

[0075] The paint layer composition includes 50wt% to 60wt% of a base resin, which includes, but is not limited to, epoxy resin, acrylic resin or polyester, and is mainly used as a carrier for the color, so that the cover plate presents different colored appearances.

[0076] The paint layer composition includes 2wt% to 10wt% of a curing agent, which is used to cure the base resin into a film. This application does not have any special restrictions on its type; it can be selected according to the type of base resin.

[0077] The paint layer composition includes 20wt% to 35wt% solvent. This application does not have any special restrictions on the solvent, as long as it can dissolve the base resin to form a solution.

[0078] The paint layer composition includes 1wt% to 2wt% color paste, which is used to make the cover plate present a corresponding color effect. This application does not have any special restrictions on the color paste, and the corresponding color paste can be selected according to the predetermined color.

[0079] The paint layer composition includes 2wt% to 10wt% of additives, which include, but are not limited to, antioxidants, polymerization inhibitors, weather-resistant additives, etc. This application does not have any special restrictions on their types and contents; commonly used antioxidants, polymerization inhibitors, and weather-resistant additives are sufficient.

[0080] In some specific implementations, the thickness of the paint layer 104 is 10μm to 20μm.

[0081] This application does not impose any special restrictions on the formation method of the paint layer 104. The primer composition is applied onto the primer layer 103 and cured. The application method includes, but is not limited to, screen printing, roller coating, etc. The curing parameters are related to the curing agent. For example, in heat curing, the curing temperature can be 60-80°C and the time can be 15-30 minutes.

[0082] In some specific implementations, to enhance the appearance of the cover plate 100, at least one or any one of an ink layer, an inner texture layer, a coating layer, and a clear coat layer can be provided between the substrate and the topcoat layer. Specifically, only one of these layers can be provided, or any two, three, or four layers can be provided.

[0083] See Figure 7 , Figure 7 This is a schematic diagram of the structure of the cover plate provided in the fourth embodiment of this application, wherein 200 is the cover plate, 201 is the substrate, 202 is the topcoat layer, 203 is the ink layer, 204 is the inner texture layer, 205 is the coating layer, and 206 is the clear varnish layer. The substrate 201 and the topcoat layer 202 are similar to those described above, and will not be described again here.

[0084] The function of the ink layer 203 is to control the color of the cover plate 200. It is a resin containing color paste and can be formed from an ink composition. For example, the ink layer 203 can be a colored epoxy resin, acrylic resin, or polyester. Specifically, the ink layer composition includes:

[0085] 50wt% to 60wt% of base resin;

[0086] 1wt% to 2wt% color paste;

[0087] 2wt% to 10wt% curing agent;

[0088] 20wt% to 30wt% of solvent and

[0089] 2wt% to 10wt% of additives.

[0090] The ink layer composition includes 50wt% to 60wt% of a base resin, which includes, but is not limited to, epoxy resin, acrylic resin or polyester, and is mainly used as a carrier for color to give the cover plate a different color appearance.

[0091] The ink layer composition includes 2wt% to 10wt% of a curing agent, which is used to cure the base resin into a film. This application does not have any special restrictions on its type; it can be selected according to the type of base resin.

[0092] The ink layer composition includes 20wt% to 35wt% solvent. This application does not have any special restrictions on the solvent, as long as it can dissolve the base resin to form a solution.

[0093] The ink layer composition includes 1wt% to 2wt% color paste, which is used to make the cover plate present the corresponding color effect. This application does not have any special restrictions on the color paste, and the corresponding color paste can be selected according to the predetermined color.

[0094] The ink layer composition includes 2wt% to 10wt% of additives, which include, but are not limited to, antioxidants, polymerization inhibitors, weather-resistant agents, etc. This application does not have any special restrictions on their types and contents; commonly used antioxidants, polymerization inhibitors, and weather-resistant agents are sufficient.

[0095] In some specific implementations, the thickness of the ink layer 203 is 10μm to 20μm.

[0096] This application does not impose any special restrictions on the formation method of the ink layer 203. The primer layer composition is applied to the substrate 201 and cured. The application method includes, but is not limited to, screen printing, roller coating, etc. The curing parameters are related to the curing agent. For example, in heat curing, the curing temperature can be 60-80°C and the time can be 15-30 minutes.

[0097] The function of the inner texture layer 204 is to provide lighting effects, such as CD patterns and light bar patterns. The inner texture layer can be formed from an inner texture layer composition; this application does not have any particular limitations on it. A typical embodiment is as follows:

[0098] 40wt% to 60wt% polyester prepolymer;

[0099] 20wt% to 30wt% of monomers;

[0100] 1 wt% to 3 wt% of photoinitiator;

[0101] 2wt% to 10wt% of additives.

[0102] The inner texture layer composition comprises 50 wt% to 60 wt% of a polyester prepolymer, which is used as a film-forming resin. This application does not impose any particular limitation on the polyester prepolymer; any appropriate polyester prepolymer can be selected based on the desired texture effect.

[0103] The inner texture layer composition comprises 2 wt% to 10 wt% of monomers used to form textures. This application does not have any particular limitation on the type of monomers, including but not limited to UV monomer DPCN, N-vinyl-2-pyrrolidone (NVP), etc.

[0104] The inner texture layer composition includes 1 wt% to 3 wt% of a photoinitiator. This application does not have any special restrictions on the photoinitiator, as long as it can initiate the polymerization of monomers or polyester prepolymers.

[0105] The inner texture layer composition includes 2 wt% to 10 wt% of additives, which include, but are not limited to, antioxidants, polymerization inhibitors, weather-resistant agents, etc. This application does not have any special restrictions on their types and contents; commonly used antioxidants, polymerization inhibitors, and weather-resistant agents are sufficient.

[0106] In some specific implementations, the thickness of the inner texture layer 204 is 10μm to 30μm.

[0107] This application does not impose any particular limitation on the formation method of the inner texture layer 204. A typical method is to dot-coat the inner texture layer composition onto the surface of the ink layer 203, roll-coat it to cover the entire surface, then transfer the texture through a texture film, and finally cure it with an LED lamp and a mercury lamp. In one specific implementation, the curing conditions are 600 mJ / cm². 2 ~1200mj / cm 2 Curing under energy for 3–8 seconds.

[0108] The coating layer 205 serves to provide a metallic texture, enhance brightness, and improve visual appeal. It can be a metal oxide film, such as zirconium oxide, chromium oxide, or nickel oxide, or a non-metal oxide film, such as silicon oxide. This application does not impose any particular limitation on the formation method of the coating layer; it can be formed by magnetron sputtering, electron gun evaporation, or other methods. In some specific implementations, the thickness of the coating layer 205 is 80 nm to 400 nm.

[0109] The function of the varnish layer 206 is to improve interlayer adhesion. It can be a bonding resin or a bonding resin containing colorant, such as colored epoxy resin, acrylic resin, or polyester, and can be formed from the varnish layer composition. Specifically, the varnish layer composition includes:

[0110] 50wt% to 60wt% of base resin;

[0111] 1wt% to 2wt% color paste;

[0112] 2wt% to 10wt% curing agent;

[0113] 20wt% to 30wt% of solvent and

[0114] 2wt% to 5wt% of additives.

[0115] The varnish composition includes 50wt% to 60wt% of a base resin, which includes, but is not limited to, epoxy resin, acrylic resin or polyester, and is mainly used as a carrier for color to give the cover plate a different color appearance.

[0116] The varnish composition includes 2 wt% to 10 wt% of a curing agent, which is used to cure the base resin into a film. This application does not have any special restrictions on its type; it can be selected according to the type of base resin.

[0117] The varnish composition includes 20wt% to 35wt% solvent. This application does not have any special restrictions on the solvent, as long as it can dissolve the base resin to form a solution.

[0118] The varnish composition includes 1 wt% to 2 wt% color paste, which is used to give the cover plate a corresponding color effect. This application does not have any special restrictions on the color paste, and the appropriate color paste can be selected according to the predetermined color.

[0119] The varnish composition includes 2 wt% to 5 wt% of additives, which include, but are not limited to, antioxidants, polymerization inhibitors, weather-resistant agents, etc. This application does not have any special restrictions on their types and contents; commonly used antioxidants, polymerization inhibitors, and weather-resistant agents are sufficient.

[0120] In some specific implementations, the thickness of the varnish layer 206 is 5μm to 10μm.

[0121] This application does not impose any special restrictions on the formation method of the varnish layer 206. The varnish layer composition is applied onto the coating layer 205 and cured. The application method includes, but is not limited to, screen printing, roll coating, etc. The curing parameters are related to the curing agent. For example, in heat curing, the curing temperature can be 60-80°C and the time can be 15-30 minutes.

[0122] In other implementations, the cover plate 200 may not include the inner texture layer 204 or the coating layer 205. In this case, the cover plate does not have a texture effect or metallic texture.

[0123] This application also provides a touchpad for an electronic device, including the touchpad cover described in the above technical solution. The touchpad cover described in the above technical solution is not only lightweight but also has a skin-friendly feel and is resistant to dirt, thus reducing the weight of the touchpad and improving the user experience.

[0124] This application also provides an electronic device, including the touchpad described in the above technical solution, which not only has a low weight but also a good user experience.

[0125] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A touchpad cover for an electronic device, comprising: Substrate and topcoat layer formed on the surface of the substrate; The surface of the topcoat layer has a loop-like texture structure formed by multiple micron-level folds; The substrate comprises a top layer, an intermediate layer, and a bottom layer stacked sequentially. The surface layer is connected to the topcoat layer; The top layer and the bottom layer each independently comprise a resin and a reinforcing material; The intermediate layer has a hollow structure in its planar structure; The topcoat composition includes: 40wt%~60wt% aliphatic polyester; 8wt%~20wt% acrylate or polyurethane; 1wt%~3wt% of photoinitiator; 20wt%~30wt% of monomers, wherein the monomers are selected from diols or low-functional esters; 2wt%~10wt% of additives; The topcoat layer is prepared according to the following steps: The topcoat composition is applied to the substrate surface using an energy of 600 mJ / cm². 2 ~800 mJ / cm 2 The first curing step is performed using LEDs with wavelengths of 460nm~650nm, followed by curing with an energy of 100mj / cm². 2 ~150 mJ / cm 2 A second curing process was performed using an excimer lamp with a wavelength of 254 nm, and finally, an energy of 800 mJ / cm² was used. 2 ~1000 mJ / cm 2 A third curing process is performed using a mercury lamp with a wavelength of 300nm to 600nm.

2. The touchpad cover sheet of claim 1, wherein, The intermediate layer is resin.

3. The touchpad cover sheet of claim 2, wherein, The intermediate layer has a honeycomb structure in its planar structure.

4. The touchpad cover sheet of claim 1, wherein, The intermediate layer is foam resin.

5. The touchpad cover sheet of claim 1, wherein, The top layer and the bottom layer are independently made of fiberglass cloth.

6. The touchpad cover sheet of any of claims 1-5, wherein, The topcoat layer is formed from a topcoat composition; The thickness of the topcoat layer is 25μm to 50μm.

7. The touchpad cover according to claim 6, characterized in that, It also includes a primer layer disposed between the topcoat layer and the substrate; The thickness of the primer layer is 3μm~5μm.

8. The touchpad cover sheet of claim 7, wherein, It also includes a color paint layer disposed between the topcoat layer and the primer layer; The thickness of the paint layer is 10μm~20μm.

9. The touchpad cover sheet of claim 6, wherein, It also includes at least one layer of ink layer, inner texture layer, coating layer and clear coat layer disposed between the substrate and the topcoat layer; The thickness of the ink layer is 10μm to 20μm, the thickness of the inner texture layer is 10μm to 30μm, the thickness of the coating layer is 80nm to 400nm, and the thickness of the varnish layer is 5μm to 10μm.

10. The touchpad cover sheet of claim 9, wherein, It includes an ink layer, an inner texture layer, a coating layer, and a varnish layer, which are sequentially disposed between the substrate and the topcoat layer.

11. A touchpad for an electronic device, comprising the touchpad cover as described in any one of claims 1 to 10.

12. An electronic device comprising the touchpad for an electronic device as described in claim 11.

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