Composite substrate, rotating shaft mechanism, and electronic device

Abstract

The application relates to the technical field of communication equipment, and provides a composite base material, a rotating shaft mechanism and electronic equipment. The composite base material comprises N carbon fiber layers and M glass fiber layers which are combined together. The carbon fiber layers are support skeletons of the composite base material, and the M glass fiber layers are sequentially stacked. The carbon fiber layers comprise carbon fibers and resin materials, and the glass fiber layers comprise glass fibers and resin materials. Two ends of an Nth carbon fiber layer are respectively connected with an (M-1)th glass fiber layer, and the Nth carbon fiber layer is arranged between an Mth glass fiber layer and an (M+2)th carbon fiber layer, so that at least part of the carbon fiber layers and the glass fiber layers are staggered and overlapped. M is a natural number greater than or equal to 3, and N is a natural number greater than or equal to 1. The composite base material, the rotating shaft mechanism and the electronic equipment provided by the application can simultaneously meet the requirements of light weight, strength and rigidity, can reduce the cost, and can improve the experience of users.

Description

Technical Field

[0001] This application relates to the field of communication equipment technology, specifically to a composite substrate, a rotating shaft mechanism, and an electronic device. Background Technology

[0002] With the rapid development of communication equipment technology, consumer demand for electronic devices is increasingly leaning towards thinner and lighter designs. To meet the requirements of hinges in electronic devices for applications involving compression, drops, and long-term bending, as well as the antenna and spurious radiation requirements, the hinge panels are currently mostly made of high-modulus stainless steel. However, stainless steel has a high density, which cannot meet the increasingly thinner and lighter demands of foldable devices. Lightweight titanium alloys and amorphous zirconium alloys can also be used for the hinge panels, but both are far more expensive than stainless steel and are not yet widely used. Inexpensive aluminum alloys, due to their significantly lower strength and stiffness compared to stainless steel, pose a high risk in compression, drops, and long-term bending scenarios, and are therefore not widely adopted.

[0003] Carbon fiber composites possess advantages such as high specific strength, high specific modulus, corrosion resistance, and low density, making them a viable alternative to stainless steel and other metallic materials. Consequently, they are widely used in aerospace, automotive, and communications fields to meet lightweighting requirements. However, carbon fiber composites are poor conductors, which can affect the radio frequency efficiency of mobile phones and potentially lead to spurious radiation, significantly limiting their application in communication equipment. To address this issue, a common method is to electroplate conductive metals such as copper and nickel onto the surface of the carbon fiber door panel to enhance its conductivity. This improves conductivity within the radiation area, reducing antenna radiation. However, the metallization process for carbon fiber is costly. Summary of the Invention

[0004] In view of this, this application proposes a composite substrate, a rotating shaft mechanism, and an electronic device that can simultaneously meet the requirements of lightweight, strength, and rigidity, while reducing costs and improving the user experience.

[0005] In a first aspect, this application provides a composite substrate comprising an N-layer carbon fiber layer and an M-layer glass fiber layer, wherein the carbon fiber layer serves as the supporting framework of the composite substrate, and the M-layer glass fiber layers are sequentially stacked; the carbon fiber layer comprises carbon fiber and resin material, and the glass fiber layer comprises glass fiber and resin material.

[0006] The two ends of the Nth carbon fiber layer are spliced ​​to the (M-1)th glass fiber layer, and the Nth carbon fiber layer is sandwiched between the Mth glass fiber layer and the (M-2)th carbon fiber layer, such that at least a portion of the carbon fiber layer and the glass fiber layer are interleaved; where M is a natural number greater than or equal to 3 and N is a natural number greater than or equal to 1.

[0007] In the above scheme, the two ends of the carbon fiber layer are spliced ​​with the corresponding glass fiber layers and sandwiched between two glass fiber layers located on both sides of the glass fiber layer. This ensures that the carbon fiber layer and the glass fiber layer overlap, guaranteeing the connection strength between them. The carbon fiber layer acts as a supporting skeleton in the composite substrate, ensuring the overall strength of the entire composite substrate. The glass fiber layer can be connected to metal structural components (main shaft, middle frame) and also improves the toughness of the composite substrate, preventing antenna signal loss.

[0008] In conjunction with the first aspect, in some embodiments, the carbon fiber layer is located in the middle region of the composite substrate.

[0009] Understandably, the carbon fiber layer is located in the middle region of the composite substrate, and is surrounded by a glass fiber layer. As a supporting skeleton of the composite substrate, the carbon fiber layer can improve the strength of the composite substrate and increase the strength of the structural components made from the composite substrate.

[0010] In conjunction with the first aspect, in some embodiments, the N-layer carbon fiber and the M-layer glass fiber are sequentially and alternately stacked.

[0011] In conjunction with the first aspect, in some embodiments, the glass fibers in the glass fiber layer are woven together with the carbon fibers in the carbon fiber layer.

[0012] To improve manufacturing efficiency and reduce costs, independently formed glass fiber layers and carbon fiber layers can be interleaved and then subjected to molding, CNC machining, etc. (CNC machining can be, for example, CNC lathe machining, CNC milling machine machining, or CNC boring and milling machine machining). After CNC machining, the carbon fiber layer will not be exposed on the surface of the composite substrate.

[0013] In conjunction with the first aspect, in some embodiments, the width of the portion of the Nth carbon fiber layer sandwiched between the Mth glass fiber layer and the M-2th carbon fiber layer is 0.1 mm to 100 mm.

[0014] Understandably, the portion sandwiched between the glass fiber layer and the carbon fiber layer can serve as a connecting end, strengthening the connection between the stacked carbon fiber layer and the glass fiber layer, making it less likely for the fiber layers to detach.

[0015] In conjunction with the first aspect, in some embodiments, the lengths of adjacent carbon fiber layers are not the same, and the lengths of adjacent glass fiber layers are the same or different.

[0016] In conjunction with the first aspect, in some embodiments, the top and bottom layers of the composite substrate are the glass fiber layers.

[0017] In conjunction with the first aspect, in some embodiments, the layup angles of adjacent fiber layers are different, and the fiber layers are selected from carbon fiber layers or glass fiber layers. For example, the layup angles of adjacent carbon fiber layers and glass fiber layers are 0 degrees and 90 degrees, respectively.

[0018] In conjunction with the first aspect, in some embodiments, the layup angle of adjacent carbon fiber layers and glass fiber layers along the thickness direction is 0 degrees to 90 degrees.

[0019] In conjunction with the first aspect, in some embodiments, the glass fibers in the glass fiber layer include chopped glass fibers and / or continuous glass fibers with a length of 0.1 mm to 100 mm. The glass fibers can be unidirectional continuous glass fibers, continuous glass fiber braids, disordered continuous glass fibers, or chopped glass fibers. No limitation is made herein.

[0020] To improve the overall strength of the composite substrate, the glass fiber is preferably a continuous glass fiber woven fabric. Specifically, the continuous glass fiber woven fabric can be woven using plain weave, twill weave, or satin weave methods, and other weaving methods can also be used, without limitation.

[0021] In conjunction with the first aspect, in some embodiments, the carbon fibers in the carbon fiber layer include short-cut carbon fibers with a length of 0.1 mm to 100 mm and / or continuous carbon fibers.

[0022] In some embodiments, the carbon fiber can be unidirectional continuous carbon fiber, continuous carbon fiber braid, disordered continuous carbon fiber, or short-cut carbon fiber with a length of 0.1 mm to 100 mm. No limitation is made here. To improve the strength of the overall composite substrate, preferably, the carbon fiber is a continuous carbon fiber braid. Specifically, the continuous carbon fiber braid can be woven using plain weave, twill weave, or satin weave methods; other weaving methods can also be used, and no limitation is made here.

[0023] In conjunction with the first aspect, in some embodiments, the glass fibers in the glass fiber layer are selected from at least one of C-glass fiber, E-glass fiber, S-glass fiber, M-glass fiber, high silica glass fiber, and hollow glass fiber.

[0024] In conjunction with the first aspect, in some embodiments, the carbon fibers in the carbon fiber layer are selected from at least one of polyacrylonitrile-based carbon fibers and pitch-based carbon fibers.

[0025] In conjunction with the first aspect, in some embodiments, the carbon fiber layer or the glass fiber layer is formed by plain weave, twill weave or satin weave.

[0026] In conjunction with the first aspect, in some embodiments, the thickness of a single glass fiber layer is 0.01 mm to 0.5 mm.

[0027] In conjunction with the first aspect, in some embodiments, the thickness of a single carbon fiber layer is 0.01 mm to 0.5 mm.

[0028] In conjunction with the first aspect, in some embodiments, the thickness of the composite substrate is 0.1 mm to 10 mm.

[0029] In conjunction with the first aspect, in some embodiments, the resin material includes at least one of thermoplastic resin and thermosetting resin; wherein the thermoplastic resin includes at least one of polyolefin, polyamide, polycarbonate, polyphenylene ether, polyphenylene sulfide, polysulfone, polyoxymethylene, polyethylene terephthalate, and polybutylene terephthalate; and the thermosetting resin includes at least one of epoxy resin, phenolic resin, amino resin, bismaleimide triazine resin, unsaturated polyester, and silicone ether resin.

[0030] Of course, in other embodiments, the thermoplastic resin may be other types of resin; the thermosetting resin may be other types of resin.

[0031] In conjunction with the first aspect, in some embodiments, the resin material tightly bonded to the carbon fiber layer is the same as the resin material tightly bonded to the glass fiber layer. Using the same resin material facilitates the fusion bonding of the carbon fiber layer and the glass fiber layer, avoids delamination of the fiber layers in the composite substrate, and also improves the overall structural stability of the composite substrate.

[0032] Secondly, this application provides a rotating shaft mechanism, including a main shaft and a rotating component rotatably connected to the main shaft, wherein the rotating component is made of the composite substrate described in the first aspect above.

[0033] Thirdly, this application provides an electronic device that includes at least the rotating shaft mechanism described in the second aspect.

[0034] The technical solution of this application has at least the following beneficial effects:

[0035] This application provides a composite substrate, a rotating shaft mechanism, and electronic equipment. In the composite substrate, the two ends of a carbon fiber layer are spliced ​​with corresponding glass fiber layers and sandwiched between two glass fiber layers located on both sides of the glass fiber layer. This ensures the staggered overlap of the carbon fiber and glass fiber layers, guaranteeing the connection strength between them. The carbon fiber layer acts as a supporting skeleton in the composite substrate, ensuring the overall strength of the entire substrate. The glass fiber layer can be connected to metal structural components (main shaft, middle frame) to avoid antenna signal loss and improve the toughness of the composite substrate and the structural components made from it.

[0036] The hinge mechanism and electronic equipment made using composite substrates can meet the requirements of lightweight, strength and rigidity. The hinge mechanism can also meet the fatigue resistance test during long-term folding test and meet the design requirements. Attached Figure Description

[0037] Figure 1 This application provides a structural schematic diagram of the foldable electronic device.

[0038] Figure 2 This is a schematic diagram of the rotating shaft mechanism provided in an embodiment of this application.

[0039] Figure 3 This is a schematic diagram of the cross-sectional structure of the composite substrate provided in an embodiment of this application.

[0040] Figure 4 This is a schematic diagram of the assembly of the composite substrate and structural components provided in the embodiments of this application.

[0041] Figure 5 This is a schematic diagram of another composite substrate provided in Embodiment 2 of this application.

[0042] Figure 6 This is a schematic diagram of another composite substrate provided in Embodiment 3 of this application.

[0043] Figure 7 This is a schematic diagram of another composite substrate provided in Embodiment 4 of this application.

[0044] Figure 8 This is a schematic diagram of another composite substrate provided in Embodiment 5 of this application.

[0045] Figure 9 This is a schematic diagram of another composite substrate provided in yet another embodiment of this application.

[0046] Figure 10 This is a schematic diagram of another composite substrate provided in another embodiment of this application. Detailed Implementation

[0047] In the description of embodiments of the present invention, it should be understood that the terms "length," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows communication between the two components; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0049] The following detailed description, in conjunction with the accompanying drawings, provides further explanation of some embodiments of the present invention.

[0050] A foldable electronic device is an electronic device whose flexible display screen can be folded. This folding functionality is achieved through built-in folding components. Such a foldable electronic device can be a mobile phone, monitor, tablet computer, in-vehicle computer, or other product with a display interface. This application does not impose any special limitations on the specific form of the aforementioned foldable electronic device.

[0051] Figure 1 The illustrated electronic device is a foldable electronic device, in which the flexible display screen is located on the inside of the device when folded. In other embodiments, the electronic device may also be a foldable electronic device with an outward folding design, in which the flexible display screen is located on the outside of the device when folded.

[0052] To achieve the foldable function of electronic devices, such as Figure 1 As shown, the foldable electronic device 100 also includes a folding component for supporting the flexible display screen 2, and the flexible display screen is attached to the upper surface of the folding component.

[0053] The folding assembly includes a first structural member 10, a second structural member 20, and a pivot mechanism 30 located between the first structural member 10 and the second structural member 20.

[0054] The first structural member 10 and the second structural member 20 can be the mid-frame of the electronic device. The first structural member 10 and the second structural member 20 can rotate around the pivot mechanism 30 on both sides, thereby causing the flexible display screen 2 to fold or unfold. Figure 1 As shown, when the first structural member 10 and the second structural member 20 are joined together, the flexible display screen 2 is in a folded state; or, when the included angle between the first structural member 10 and the second structural member 20 is 180 degrees, the flexible display screen 2 is in an unfolded state.

[0055] Figure 2 This is a schematic diagram of the rotating shaft mechanism provided in the embodiments of this application, as shown below. Figure 2 As shown, the rotating mechanism 30 includes a main shaft 31 and a rotating component 32 rotatably connected to the main shaft 31. Currently, existing rotating components use high-modulus stainless steel, but stainless steel has a high density, which makes it difficult to meet the increasingly thin and light requirements of foldable electronic devices.

[0056] It should be noted that the electronic device 100 can have two or more structural components. When there are two or more structural components, adjacent structural components can rotate around mutually parallel axes of rotation, thereby forming a multi-layered folding structure, or unfolding to obtain a larger display area. In the embodiments of this application, the electronic device 100 mainly has two structural components (i.e., Figure 1 The first structural component 10 and the second structural component 20 will be used as examples for illustration.

[0057] In other embodiments of this application, the electronic device 100 may include more or fewer components than those illustrated, or combine some components, or split some components, or have different component arrangements. For example, the electronic device 100 may also include a display screen and a back cover (not shown). The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0058] To ensure the performance of foldable electronic devices under conditions of compression, drop, and long-term bending, as well as antenna and radiated stray emissions requirements, stainless steel hinge mechanisms can be used. However, hinge mechanisms made of this material are difficult to meet the requirements for lightweighting. Therefore, there is an urgent need to develop a hinge mechanism that can meet the requirements for lightweighting while also satisfying the requirements for strength and rigidity.

[0059] The performance of several commonly used materials in terms of lightweighting, yield strength, and elastic modulus after testing is shown in Table 1 below.

[0060] Table 1. Relevant performance parameters of commonly used materials

[0061] Material <![CDATA[Density (g / cm 3 )]]> Yield strength (MPa) Elastic modulus (GPa) SUS316L stainless steel 7.9 1100 193 Amorphous zirconium alloy 6.8 1300 90 Titanium alloy 4.5 750 120 High-strength aluminum alloy 2.7 400 70 carbon fiber 1.8 2000 180 Fiberglass 2.3 1700 90

[0062] In some implementations, the pivot mechanism 30 may be made of lightweight titanium alloy or amorphous zirconium alloy, but both are far more expensive than stainless steel and are not currently widely used.

[0063] Inexpensive aluminum alloys, due to their significantly lower strength and stiffness compared to stainless steel, pose a high risk of damage from extrusion, drops, and prolonged bending, and have not been widely adopted.

[0064] Carbon fiber, due to its excellent axial mechanical strength and low density, along with advantages such as high specific modulus, high specific strength, and low density, can replace high-strength metals like stainless steel and is widely used in aerospace, shipbuilding, and automotive industries. However, the conductivity of carbon fiber currently has a shielding effect on antennas. Furthermore, the rotating parts are connected to the main shaft and the first structural component (middle frame) via metal parts, causing the carbon fiber to affect antenna radiation. To address this issue, a common method is to electroplate conductive metals such as copper and nickel onto the surface of the carbon fiber panel to enhance the conductivity of the rotating parts, ensuring good conductivity within the radiation area and reducing antenna radiation. However, the carbon fiber metallization process is complex and costly.

[0065] Carbon fiber (CF) is a new type of fiber material with a carbon content of over 95%, characterized by high strength and high modulus. It is formed by stacking organic fibers such as sheet-like graphite microcrystals along the fiber axis, and then undergoing carbonization and graphitization processes to obtain microcrystalline graphite material. Carbon fiber is lighter than aluminum but stronger than steel, possessing corrosion resistance, high modulus, and the inherent properties of carbon materials, while also exhibiting the flexibility and processability of textile fibers. Furthermore, carbon fiber has high axial strength and modulus, low density, high specific performance, no creep, resistance to ultra-high temperatures in non-oxidizing environments, good fatigue resistance, specific heat and electrical conductivity between non-metals and metals, a small and anisotropic coefficient of thermal expansion, good corrosion resistance, good X-ray permeability, and excellent electrical and thermal conductivity as well as electromagnetic shielding properties.

[0066] Glass fiber is an inorganic non-metallic material with advantages such as good insulation, strong heat resistance, good corrosion resistance, and high mechanical strength. By coating a glass fiber substrate with resin to form a glass fiber substrate, it is possible to combine advantages such as flame retardancy, impact resistance, corrosion resistance, high mechanical strength, and thinness. Glass fiber has good electrical conductivity, reducing antenna radiation, meeting spurious emission requirements, and can be effectively connected to structural components such as the main shaft and middle frame.

[0067] Figure 3 This is a schematic diagram of the cross-sectional structure of the composite substrate provided in the embodiments of this application, as shown below. Figure 3As shown, this application provides a composite substrate, which includes N layers of carbon fiber and M layers of glass fiber connected to each other. The carbon fiber layers are the supporting skeleton of the composite substrate, and the M layers of glass fiber are stacked sequentially.

[0068] The carbon fiber layer comprises carbon fiber and resin material, and the glass fiber layer comprises glass fiber and resin material;

[0069] The two ends of the Nth carbon fiber layer are spliced ​​to the (M-1)th glass fiber layer, and the Nth carbon fiber layer is sandwiched between the Mth glass fiber layer and the (M-2)th carbon fiber layer, such that at least a portion of the carbon fiber layer and the glass fiber layer are interleaved; where M is a natural number greater than or equal to 3 and N is a natural number greater than or equal to 1.

[0070] In the above scheme, the two ends of the carbon fiber layer are spliced ​​with the corresponding glass fiber layers and sandwiched between two glass fiber layers located on both sides of the glass fiber layer. This ensures that the carbon fiber layer and the glass fiber layer overlap, guaranteeing the connection strength between them. The carbon fiber layer acts as a supporting skeleton in the composite substrate, ensuring the overall strength of the entire composite substrate. The glass fiber layer can be connected to metal structural components (main shaft, middle frame) and also improves the toughness of the composite substrate, preventing antenna signal loss.

[0071] like Figure 3 As shown, the composite substrate includes a first glass fiber layer 101, a second glass fiber layer 102, a third glass fiber layer 103, a fourth glass fiber layer 104 and a fifth glass fiber layer 105 stacked together. The composite substrate also includes a first carbon fiber layer 201, a second carbon fiber layer 202 and a third carbon fiber layer 203.

[0072] The first carbon fiber layer 201 is spliced ​​to the second glass fiber layer 102 at both ends, and the first carbon fiber layer 201 is sandwiched between the first glass fiber layer 101 and the third glass fiber layer 103 respectively.

[0073] The two ends of the second carbon fiber layer 202 are spliced ​​with the third glass fiber layer 103, and the second carbon fiber layer 202 is sandwiched between the second glass fiber layer 102 and the fourth glass fiber layer 104.

[0074] The two ends of the third carbon fiber layer 203 are spliced ​​with the fourth glass fiber layer 104, and the third carbon fiber layer 203 is sandwiched between the third glass fiber layer 103 and the fifth glass fiber layer 105.

[0075] Understandably, this staggered clamping structure design ensures the connection strength between the glass fiber layer and the carbon fiber layer. The overlapping of the glass fiber and carbon fiber layers increases the contact area, thereby improving the strength of the joint. The carbon fiber layer inside the composite substrate enhances its rigidity, while the glass fiber layer on the entire surface of the composite substrate reduces antenna losses and also improves the toughness and strength of the composite substrate.

[0076] Further, the composite substrate includes a fiber layer 1 and a resin material 2 tightly bonded to the fiber layer 1. In some embodiments, the resin material includes at least one of thermoplastic resin and thermosetting resin, wherein the thermoplastic resin may be selected from at least one of polyolefin, polyamide, polycarbonate, polyphenylene ether, polyphenylene sulfide, polysulfone, polyoxymethylene, polyethylene terephthalate, and polybutylene terephthalate. Of course, in other embodiments, the thermoplastic resin may also be other types of resin.

[0077] In some embodiments, the thermosetting resin includes at least one selected from epoxy resin, phenolic resin, amino resin, bismaleimide triazine resin, unsaturated polyester, and silicone ether resin. Of course, in other embodiments, the thermosetting resin may be other types of resin.

[0078] In some embodiments, the glass fiber layer comprises glass fibers and resin material, wherein the glass fibers include chopped glass fibers of 0.1 mm to 100 mm or continuous glass fibers. The glass fibers can be unidirectional continuous glass fibers, continuous glass fiber braids, disordered continuous glass fibers, or chopped glass fibers. No limitation is made herein.

[0079] To improve the overall strength of the composite substrate, the glass fiber is preferably a continuous glass fiber woven fabric. Specifically, the continuous glass fiber woven fabric can be woven using plain weave, twill weave, or satin weave methods, and other weaving methods can also be used, without limitation.

[0080] Specifically, the glass fibers in the glass fiber layer are selected from at least one of C-glass fiber, E-glass fiber, S-glass fiber, M-glass fiber, high silica glass fiber, and hollow glass fiber; in this application, the specific material of the glass fiber is not limited.

[0081] In other embodiments, the glass fiber layer may also include at least one of basalt fiber, andesite fiber, aluminosilicate fiber, boron nitride fiber, alumina fiber, and quartz fiber, and the inorganic fiber can prevent radiation straying.

[0082] In some embodiments, the thickness of a single glass fiber layer is 0.01mm to 0.5mm, specifically 0.01mm, 0.05mm, 0.08mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm, etc. The embodiments of this application do not limit this, nor are they limited to the above examples.

[0083] In some embodiments, the carbon fiber layer includes carbon fibers and resin materials, which may be thermoplastic resins or thermosetting resins, and will not be described in detail here.

[0084] Specifically, carbon fiber can be at least one of polyacrylonitrile-based carbon fiber and pitch-based carbon fiber. Carbon fiber can be unidirectional continuous carbon fiber, continuous carbon fiber braided fabric, disordered continuous carbon fiber, or short-cut carbon fiber with a length of 0.1 mm to 100 mm. No specific limitations are imposed here.

[0085] To improve the overall strength of the composite substrate, the carbon fiber is preferably a continuous carbon fiber woven fabric. Specifically, the continuous carbon fiber woven fabric can be woven using plain weave, twill weave, or satin weave methods, and other weaving methods can also be used, without limitation.

[0086] In some embodiments, the glass fibers in the glass fiber layer are woven together with the carbon fibers in the carbon fiber layer. To improve manufacturing efficiency and reduce costs, independently formed glass fiber layers and carbon fiber layers can be interlaced and then subjected to molding, CNC machining, etc. (where CNC machining can be, for example, CNC lathe machining, CNC milling machine machining, or CNC boring and milling machine machining). After CNC machining, the carbon fiber layer will not be exposed on the surface of the composite substrate.

[0087] In some embodiments, the thickness of a single carbon fiber layer is 0.01mm to 0.5mm, specifically 0.01mm, 0.05mm, 0.08mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm, etc. The embodiments of this application do not limit this, nor are they limited to the above examples.

[0088] like Figure 3As shown, the width d of the portion of the Nth carbon fiber layer sandwiched between the Mth glass fiber layer and the (M-2)th carbon fiber layer is 0.1mm to 100mm. Specifically, it can be 0.1mm, 0.5mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 10mm, 20mm, 30mm, 50mm, or 100mm, and is not limited to the examples above. The portion sandwiched between the glass fiber and carbon fiber layers serves as a connecting end, strengthening the connection between the stacked carbon fiber and glass fiber layers, preventing the fiber layers from easily detaching. Preferably, the width d of the portion of the Nth carbon fiber layer sandwiched between the Mth glass fiber layer and the (M-2)th carbon fiber layer is 1mm to 10mm.

[0089] In some implementations, the lengths of adjacent carbon fiber layers are not the same, and the lengths of adjacent glass fiber layers may be the same or different.

[0090] To avoid exposing the carbon fiber layer and affecting the antenna and spurious radiation requirements of electronic devices, the top and bottom layers of the composite substrate are the glass fiber layers.

[0091] In some embodiments, adjacent fiber layers have different layup angles along the thickness direction, and the fiber layers are selected from carbon fiber layers or glass fiber layers. For example, adjacent carbon fiber layers and glass fiber layers have layup angles of 0 degrees and 90 degrees, respectively.

[0092] In this embodiment, the layup angle of the first glass fiber layer 101 is 0 degrees, the layup angle of the first carbon fiber layer 201 and the second glass fiber layer 102 is 90 degrees, the layup angle of the third glass fiber layer 103 and the second carbon fiber layer 202 is 0 degrees, the layup angle of the fourth glass fiber layer 104 and the third carbon fiber layer 203 is 90 degrees, and the layup angle of the fifth glass fiber layer 105 is 0 degrees. The fiber layers are stacked sequentially.

[0093] Figure 4 This is a schematic diagram of the assembly of the composite substrate and structural components provided in the embodiments of this application. Specifically, the structural component can be a metal spindle 31 in a rotating mechanism, wherein the spindle 31 is connected to the glass fiber layer of the composite substrate through a metal overlapping surface; the structural component can also be a first structural component 10 and / or a second structural component 20 made of metal, that is, the metal frame can be connected to the glass fiber layer of the composite substrate through a metal overlapping surface, specifically by riveting, screw connection, etc. Riveting connection can prevent the metal frame from falling off the composite substrate, improve connection stability, thereby improving the stability of the overall structure, and is suitable for use scenarios such as repeated bending.

[0094] In some implementations, the metal structural components are connected to the composite substrate, which utilizes the high strength and rigidity of the composite substrate to meet the increasingly thin and light requirements of foldable electronic devices, while also ensuring the stability of the foldable components during repeated folding and use.

[0095] Figure 5 This is a schematic diagram of another composite substrate provided in Embodiment 2 of this application, as shown below. Figure 5 As shown, the composite substrate includes a first glass fiber layer 101, a second glass fiber layer 102, a third glass fiber layer 103, a fourth glass fiber layer 104, a fifth glass fiber layer 105, a sixth glass fiber layer 106, and a seventh glass fiber layer 107 stacked together. The composite substrate also includes a first carbon fiber layer 201, a second carbon fiber layer 202, and a third carbon fiber layer 203.

[0096] In this embodiment, the two ends of the first carbon fiber layer 201 are spliced ​​with the second glass fiber layer 102, and the two ends of the first carbon fiber layer 201 are respectively sandwiched between the first glass fiber layer 101 and the third glass fiber layer 103.

[0097] The two ends of the second carbon fiber layer 202 are spliced ​​with the third glass fiber layer 103, and the second carbon fiber layer 202 is sandwiched between the second glass fiber layer 102 and the fourth glass fiber layer 104.

[0098] The two ends of the third carbon fiber layer 203 are spliced ​​with the sixth glass fiber layer 106, and the third carbon fiber layer 203 is sandwiched between the fifth glass fiber layer 105 and the seventh glass fiber layer 107.

[0099] Unlike Embodiment 1, two glass fiber layers are sandwiched between the second carbon fiber layer 202 and the third carbon fiber layer 203, that is, the different carbon fiber layers are connected by glass fiber layers.

[0100] Figure 6 This is a schematic diagram of another composite substrate provided in Embodiment 3 of this application, as shown below. Figure 6 As shown, unlike Embodiment 2, two glass fiber layers are sandwiched between the first carbon fiber layer 201 and the second carbon fiber layer 202, that is, the different carbon fiber layers are connected by the glass fiber layers.

[0101] Figure 7 This is a schematic diagram of another composite substrate provided in Embodiment 4 of this application, as shown below. Figure 7As shown, the composite substrate includes a first glass fiber layer 101, a second glass fiber layer 102, a third glass fiber layer 103, a fourth glass fiber layer 104, a fifth glass fiber layer 105, a sixth glass fiber layer 106, and a seventh glass fiber layer 107 stacked together. The composite substrate also includes a first carbon fiber layer 201, a second carbon fiber layer 202, a third carbon fiber layer 203, a fourth carbon fiber layer 204, and a fifth carbon fiber layer 205.

[0102] In this embodiment, the two ends of the first carbon fiber layer 201 are spliced ​​with the second glass fiber layer 102, and the two ends of the first carbon fiber layer 201 are respectively sandwiched between the first glass fiber layer 101 and the third glass fiber layer 103.

[0103] The two ends of the second carbon fiber layer 202 are spliced ​​with the third glass fiber layer 103, and the second carbon fiber layer 202 is sandwiched between the second glass fiber layer 102 and the fourth glass fiber layer 104.

[0104] The two ends of the third carbon fiber layer 203 are spliced ​​with the fourth glass fiber layer 104, and the third carbon fiber layer 203 is sandwiched between the third glass fiber layer 103 and the fifth glass fiber layer 105.

[0105] The two ends of the fourth carbon fiber layer 204 are spliced ​​with the fifth glass fiber layer 105, and the fourth carbon fiber layer 204 is sandwiched between the fourth glass fiber layer 104 and the sixth glass fiber layer 106.

[0106] The fifth carbon fiber layer 205 is spliced ​​to the sixth glass fiber layer 106 at both ends, and the fifth carbon fiber layer 205 is sandwiched between the fifth glass fiber layer 105 and the seventh glass fiber layer 107.

[0107] Figure 8 This is a schematic diagram of the structure of another composite substrate provided in Embodiment 5 of this application, as shown below. Figure 8 As shown, unlike Embodiment 4, the composite substrate includes a first carbon fiber layer 201, a second carbon fiber layer 202 and a third carbon fiber layer 203. Any glass fiber (carbon fiber) layer is sandwiched between two glass fiber layers to form a composite fiber layer unit, and then the composite fiber layer units are stacked and bonded together.

[0108] In some other embodiments, the N-layer carbon fiber and the M-layer glass fiber are sequentially and alternately stacked. This sequential and alternate stacking simplifies the fabrication process and effectively ensures the strength of the composite substrate.

[0109] In some embodiments, the thickness of the composite substrate is 0.1 mm to 10 mm, specifically 0.1 mm, 0.5 mm, 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 7 mm, 9 mm, or 10 mm, and is not limited to the examples above. A composite substrate of suitable thickness can ensure the lightweight, strength, and rigidity requirements of the composite substrate.

[0110] In some embodiments, the resin material of the carbon fiber layer is the same as that of the glass fiber layer. Using the same resin material facilitates the fusion bonding of the carbon fiber layer and the glass fiber layer, avoids the delamination of the fiber layers in the composite substrate, and can also improve the overall structural stability of the composite substrate.

[0111] This application also provides a method for preparing a composite substrate, comprising the following steps:

[0112] Step S1: Lay out the glass fiber layer and carbon fiber layer according to different angles, thicknesses and sequences.

[0113] Step S2: The composite layer after layup is hot-pressed to melt and soften at least part of the resin material on the surface of the prepreg, and then cooled to obtain the pressed composite substrate.

[0114] The composite substrate can be processed into the required structural parts through secondary processing, including but not limited to CNC precision machine tool processing, laser processing, water jet cutting, wire cutting, etc.

[0115] The structural components can be hinge components or other structural components, and can be applied to electronic products such as foldable terminals, PCs, iPads, and mobile phones.

[0116] It should be noted that the glass fiber layer and carbon fiber layer can be at least one of fiber woven prepreg, unidirectional fiber prepreg, and fiber felt prepreg.

[0117] In the prepared composite substrate, the carbon fiber layer is located in the central region of the composite substrate and is not exposed on the outside. This will not affect the antenna and spurious radiation requirements of electronic devices, and can also meet the strength and stiffness requirements of structural components such as rotating shaft mechanisms.

[0118] See Figure 2 and Figure 4 As shown, the rotating mechanism 30 includes a main shaft 31 and a rotating component 32 rotatably connected to the main shaft. The rotating component 32 is used to support the flexible display screen of the foldable electronic device. Either the rotating component 32 or the main shaft 31 can be made of the composite substrate described in Embodiment 1, or both the rotating component 32 and the main shaft 31 can be made of the composite substrate described in Embodiment 1.

[0119] By using the aforementioned composite substrate in the pivot mechanism 30, compared to pivots in the prior art, the rigidity and strength of the structure can be improved while meeting the requirements for lightweighting, and costs can be reduced, thus enhancing the user experience.

[0120] It should be noted that the hinge mechanism 30 provided in this application embodiment may include, but is not limited to, components such as a personal computer (PC) hinge, a personal computer (PC) heat conduction hinge, a folding machine hinge, a folding machine heat conduction hinge, a tablet computer hinge, and a tablet computer heat conduction hinge.

[0121] The embodiments of the present invention will be further described below with reference to several examples. However, the embodiments of the present invention are not limited to the specific embodiments described below. Appropriate modifications can be made within the scope of the original claims.

[0122] Example 1:

[0123] like Figure 8 As shown, 0.1mm thick carbon fiber prepreg and 0.1mm thick glass fiber prepreg are selected, and according to... Figure 8 The layer shown is laid up, and glass fiber areas with L2=30mm are designed at both ends of the layer. The junction of glass fiber and carbon fiber adopts "overlapping" layering, that is, continuous glass fiber or carbon fiber is designed at 5mm on the left and right sides of 30mm at both ends to form a structure similar to mortise and tenon.

[0124] In this embodiment, the two ends of the first carbon fiber layer 201 are spliced ​​with the second glass fiber layer 102, the two ends of the second carbon fiber layer 202 are spliced ​​with the fifth glass fiber layer 105, and the two ends of the third carbon fiber layer 203 are spliced ​​with the eighth glass fiber layer 108; and the layup angles of the fiber layers of adjacent two layers are 0 degrees and 90 degrees, respectively.

[0125] The prepreg layers are placed in a mold and molded at 180°C for 1 hour to form a rough blank. The rotating part is then machined using a CNC machine tool. Finally, the rotating part is riveted to the surface of the spindle to obtain the rotating shaft mechanism.

[0126] Example 2:

[0127] like Figure 9 As shown, 0.1mm thick carbon fiber prepreg and 0.1mm thick glass fiber prepreg are selected, and according to... Figure 9 The layers are laid up, and glass fiber areas with L2=30mm are designed at both ends of the layer. The junction of glass fiber and carbon fiber adopts "overlapping" layering, that is, continuous glass fiber or carbon fiber is designed at 10mm on the left and right sides of 30mm at both ends to form a structure similar to mortise and tenon.

[0128] In this embodiment, the two ends of the first carbon fiber layer 201 are spliced ​​with the second glass fiber layer 102, the two ends of the second carbon fiber layer 202 are spliced ​​with the third glass fiber layer 103, and the two ends of the third carbon fiber layer 203 are spliced ​​with the eighth glass fiber layer 108; and the layup angles of the adjacent two fiber layers are 0 degrees and 90 degrees, respectively.

[0129] The prepreg layers are placed in a mold and molded at 180°C for 1 hour to form a rough blank. The rotating part is then machined using a CNC machine tool. The rotating part is riveted to the surface of the spindle to obtain the rotating shaft mechanism.

[0130] Example 3:

[0131] like Figure 10 As shown, 0.1mm thick carbon fiber prepreg and 0.2mm thick glass fiber woven fabric, and 0.1mm thick glass fiber prepreg are selected, and according to... Figure 10 The layers are laid up, and glass fiber areas with L2=30mm are designed at both ends of the layer. The junction of glass fiber and carbon fiber adopts "overlapping" layering, that is, continuous glass fiber or carbon fiber is designed at 10mm on the left and right sides of 30mm at both ends to form a structure similar to mortise and tenon.

[0132] In this embodiment, the two ends of the first carbon fiber layer 201 are spliced ​​with the second glass fiber layer 102, the two ends of the second carbon fiber layer 202 are spliced ​​with the third glass fiber layer 103, and the two ends of the third carbon fiber layer 203 are spliced ​​with the sixth glass fiber layer 106; and the layup angles of the adjacent two fiber layers are 0 degrees and 90 degrees, respectively.

[0133] The prepreg layers are placed in a mold and molded at 180°C for 1 hour to form a rough blank. The rotating part is then machined using a CNC machine tool. The rotating part is riveted to the surface of the spindle to obtain the rotating shaft mechanism.

[0134] Comparative Example 1:

[0135] Comparative Example 1 uses a rotating shaft mechanism made of stainless steel.

[0136] Comparative Example 2:

[0137] This comparative example uses 7 layers of pure 0.1mm thick carbon fiber prepreg. The prepreg is then placed in a mold and molded at 180°C for 1 hour to form a rough blank. The rotating part is then machined using a CNC machine tool. Finally, the spindle is riveted to the surface of the rotating part to obtain the rotating shaft mechanism.

[0138] Comparative Example 3:

[0139] This comparative example uses 7 layers of pure 0.1mm thick glass fiber prepreg. The prepreg is then placed in a mold and molded at 180°C for 1 hour to form a rough blank. The rotating part is then machined using a CNC machine tool. Finally, the spindle is riveted to the surface of the rotating part to obtain the rotating shaft mechanism.

[0140] The rotating shaft mechanisms made in Examples 1-3 and Comparative Examples 1-3 were tested for density, yield strength, elastic ink content and radiation stray performance. The structures after testing are shown in Table 2.

[0141] Table 2 shows the test result parameters for Examples 1-3 (S1-S3) and Comparative Examples 1-3 (D1-D3):

[0142] Table 2. Test Result Parameter Table

[0143] sample <![CDATA[Density (g / cm 3 )]]> Yield strength (MPa) Elastic modulus (GPa) Radiated stray emission performance (dBm) S1 1.78 1200 60 -85 S2 1.80 1300 62 -80 S3 1.76 900 56 -85 D1 7.9 1100 193 / D2 1.55 1800 75 -40 D3 2.0 1500 25 -100

[0144] According to the test results of Examples 1 to 3, the rotating part of the present invention is made of a composite substrate made of glass fiber and carbon fiber. The carbon fiber layer inside the composite substrate can enhance the rigidity of the composite substrate, and the glass fiber layer on the entire surface of the composite substrate can reduce the loss of the antenna. While meeting the requirements of lightweighting, it can also improve the toughness and strength of the composite substrate.

[0145] Comparative Example 1 uses stainless steel to make the rotating shaft mechanism, but the rotating shaft mechanism cannot meet the requirements for lightweighting.

[0146] Comparative Example 2 uses a composite material made of carbon fiber to prepare the shaft mechanism. Although the shaft mechanism can meet the requirements of lightweighting, it has poor radiation straying.

[0147] Comparative Example 3 uses a composite material made of glass fiber to prepare the shaft mechanism. Without carbon fiber as a supporting structure, the elastic modulus of the composite material decreases, and the deformation resistance of the shaft mechanism decreases, which does not meet the long-term folding and rotating use conditions.

[0148] Although this application discloses preferred embodiments as described above, it is not intended to limit the claims. Any person skilled in the art can make several possible changes and modifications without departing from the concept of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.

Claims

1. An electronic device, characterized in that, It includes at least a rotating shaft mechanism, which includes a main shaft and a rotating component rotatably connected to the main shaft. The rotating component is made of a composite substrate, which includes N layers of carbon fiber and M layers of glass fiber that are composited together. The carbon fiber layers serve as the supporting skeleton of the composite substrate, and the M layers of glass fiber are stacked sequentially. The carbon fiber layers are located in the middle region of the composite substrate. The carbon fiber layer comprises carbon fiber and resin material, and the glass fiber layer comprises glass fiber and resin material; The two ends of the Nth carbon fiber layer are spliced ​​to the (M-1)th glass fiber layer, and the Nth carbon fiber layer is sandwiched between the Mth glass fiber layer and the (M-2)th carbon fiber layer, such that at least a portion of the carbon fiber layer and the glass fiber layer are interleaved; where M is a natural number greater than or equal to 3 and N is a natural number greater than or equal to 1.

2. The electronic device according to claim 1, characterized in that, The N-layer carbon fiber and the M-layer glass fiber are stacked alternately in sequence.

3. The electronic device according to claim 1, characterized in that, The glass fibers in the glass fiber layer are woven together with the carbon fibers in the carbon fiber layer.

4. The electronic device according to claim 1, characterized in that, The width of the portion of the Nth carbon fiber layer sandwiched between the Mth glass fiber layer and the M-2th carbon fiber layer is 0.1mm to 100mm.

5. The electronic device according to claim 4, characterized in that, The lengths of adjacent carbon fiber layers are not the same, and the lengths of adjacent glass fiber layers may be the same or different.

6. The electronic device according to any one of claims 1 to 3, characterized in that, The top and bottom layers of the composite substrate are the glass fiber layers.

7. The electronic device according to claim 1, characterized in that, The layup angles of adjacent fiber layers are different, and the fiber layers are selected from carbon fiber layers or glass fiber layers.

8. The electronic device according to claim 1, characterized in that, Along the thickness direction, the layup angle between adjacent carbon fiber layers and glass fiber layers is 0 degrees to 90 degrees.

9. The electronic device according to any one of claims 1 to 3, characterized in that, The composite substrate satisfies at least one of the following characteristics: (1) The glass fibers in the glass fiber layer include short glass fibers with a length of 0.1 mm to 100 mm and / or continuous glass fibers; (2) The carbon fibers in the carbon fiber layer include short-cut carbon fibers with a length of 0.1 mm to 100 mm and / or continuous carbon fibers; (3) The glass fibers in the glass fiber layer are selected from at least one of C-glass fiber, E-glass fiber, S-glass fiber, M-glass fiber, high silica glass fiber and hollow glass fiber; (4) The carbon fibers in the carbon fiber layer are selected from at least one of polyacrylonitrile-based carbon fibers and pitch-based carbon fibers; (5) The carbon fiber layer or the glass fiber layer is formed by plain weave, twill weave or satin weave; (6) The thickness of a single glass fiber layer is 0.01 mm to 0.5 mm; (7) The thickness of a single layer of the carbon fiber layer is 0.01 mm to 0.5 mm; (8) The thickness of the composite substrate is 0.1 mm to 10 mm.

10. The electronic device according to claim 1, characterized in that, The resin material includes at least one of thermoplastic resin and thermosetting resin; The thermoplastic resin includes at least one of polyolefin, polyamide, polycarbonate, polyphenylene ether, polyphenylene sulfide, polysulfone, polyoxymethylene, polyethylene terephthalate, and polybutylene terephthalate. The thermosetting resin includes at least one of epoxy resin, phenolic resin, amino resin, bismaleimide triazine resin, unsaturated polyester, and silicone ether resin.

11. The electronic device according to claim 1 or 10, characterized in that, The resin material tightly bonded to the carbon fiber layer is the same as the resin material tightly bonded to the glass fiber layer.

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