Glass fiber plate, rear cover, electronic equipment and preparation method of glass fiber plate

Abstract

The invention provides a glass fiber plate, a rear cover, electronic equipment and a preparation method of the glass fiber plate, which are used for improving the puncture resistance of the glass fiber plate and improving the use reliability of the electronic equipment. The glass fiber plate comprises a plurality of glass fiber layers which are arranged in a stacked mode. Each glass fiber layer comprises a plurality of first fibers and a plurality of second fibers. Each glass fiber layer has a first direction and a second direction. The first fibers extend in the first direction of the glass fiber layer and are arranged at intervals in the second direction of the glass fiber layer. The second fibers extend in the first direction of the glass fiber layer and are arranged at intervals in the first direction of the glass fiber layer. The spiral staggered angle between the at least two glass fiber layers is larger than 0 degree and smaller than 90 degrees, or larger than 90 degrees and smaller than 180 degrees. Wherein the spiral staggered angle between the two glass fiber layers is the included angle between the first directions of the two glass fiber layers, or the spiral staggered angle between the two glass fiber layers is the included angle between the second directions of the two glass fiber layers.

Description

Fiberglass board, back cover, electronic device and method for preparing fiberglass board

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 29, 2022, with application number 202210905853.4 and application name “Glass fiber board, back cover, electronic device and method for preparing glass fiber board”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of electronic equipment, and in particular to a glass fiber board, a back cover, an electronic device, and a method for preparing the glass fiber board. Background Art

[0003] With the continuous development of science and technology, electronic devices such as mobile phones are widely used in people's daily lives and work, and have become indispensable daily necessities. Currently, fiberglass boards (also known as glass fiber boards) are often used to make the back covers of electronic devices to achieve lightweight and thin designs. However, fiberglass boards have poor puncture resistance, which reduces the reliability of electronic devices.

[0004] Summary of the Invention

[0005] The present application provides a glass fiber board, a back cover, an electronic device and a method for preparing the glass fiber board, which are used to improve the puncture resistance of the glass fiber board and improve the reliability of the electronic device.

[0006] In a first aspect, the present application provides a fiberglass board comprising multiple fiberglass layers stacked together. Each fiberglass layer comprises a plurality of first fibers and a plurality of second fibers, the plurality of first fibers and the plurality of second fibers being arranged intersectingly. Each fiberglass layer has a first direction and a second direction. The plurality of first fibers extend along the first direction of the fiberglass layer and are spaced apart along the second direction of the fiberglass layer. The plurality of second fibers extend along the first direction of the fiberglass layer and are spaced apart along the first direction of the fiberglass layer.

[0007] Wherein, a spiral stagger angle is formed between any two glass fiber layers. The spiral stagger angle between the two glass fiber layers is the angle between the first directions of the two glass fiber layers, or the spiral stagger angle between the two glass fiber layers is the angle between the second directions of the two glass fiber layers.

[0008] The spiral staggered angle between at least two glass fiber layers is greater than 0 degrees and less than 90 degrees, or greater than 90 degrees and less than 180 degrees. In other words, at least two glass fiber layers are stacked in a spiral staggered manner.

[0009] In the fiberglass board shown in the present application, at least two layers of fiberglass are stacked in a spiral staggered pattern, and the first fibers and second fibers of the at least two layers of fiberglass are staggered in a "M" shape, thereby increasing the interlayer bonding strength between the multiple fiberglass layers. When the fiberglass board is subjected to a puncture force F, the puncture force F can be transmitted along the extension direction of the first fibers and second fibers of the multiple fiberglass layers. Since the at least two layers of fiberglass are stacked in a spiral staggered pattern, the puncture force F can be transmitted in multiple directions, increasing the force-bearing area of ​​the fiberglass board, enhancing the stress diffusion effect of the fiberglass board, and increasing the synergistic toughening ability within the fiberglass board, thereby improving the puncture resistance of the fiberglass board.

[0010] In one embodiment, the first direction of the glass fiber layer and the second direction of the glass fiber layer are perpendicular to each other.

[0011] In one embodiment, the glass fiber layer is woven from a plurality of first fibers and a plurality of second fibers.

[0012] In one embodiment, the spiral staggered angle between any two glass fiber layers is greater than 0 degrees and less than 180 degrees. In other words, the multiple glass fiber layers are spirally staggered and stacked, and the first fibers and second fibers of any two glass fiber layers are staggered in a "M" shape, thereby increasing the interlayer bonding force between the multiple glass fiber layers. When the glass fiber board is subjected to a puncture force F, the puncture force F can be transmitted along the extension direction of the first fibers and second fibers of the multiple glass fiber layers. Since the multiple glass fiber layers are spirally staggered and stacked, the puncture force F can be transmitted in multiple directions, which increases the force-bearing area of ​​the glass fiber board, enhances the stress diffusion effect of the glass fiber board, and increases the synergistic toughening ability inside the glass fiber board, thereby improving the puncture resistance of the glass fiber board.

[0013] In one embodiment, the spiral staggered angle between any two glass fiber layers is greater than 0 degrees and less than 90 degrees, so that the first fibers and the second fibers in the multiple glass fiber layers diverge in multiple directions, which helps to improve the stress dispersion effect of the glass fiber board and thereby improve the puncture resistance of the glass fiber board.

[0014] In one embodiment, the spiral staggered angle between any two glass fiber layers is greater than 0 degrees and less than or equal to 45 degrees, so that the first fibers and the second fibers in the multiple glass fiber layers diverge in multiple directions, which helps to improve the stress diffusion effect of the glass fiber board and thereby improve the puncture resistance of the glass fiber board.

[0015] In one embodiment, the helical stagger angle between two adjacent fiberglass layers is greater than 0 degrees and less than or equal to 45 degrees. This allows the first fibers and second fibers in the multiple fiberglass layers to diverge in multiple directions, thereby improving the stress dispersion of the fiberglass board and, in turn, the puncture resistance of the fiberglass board. For example, the angle between two adjacent fiberglass layers is 20 degrees, 30 degrees, or 45 degrees.

[0016] In one embodiment, in each glass fiber layer, the plurality of first fibers and the plurality of second fibers are glass fibers.

[0017] In one embodiment, the multiple glass fiber layers include one or more composite glass fiber layers. In each composite glass fiber layer, the plurality of second fibers include one or more third fibers. The toughness of the third fibers is greater than the toughness of the glass fibers.

[0018] In the composite glass fiber layer, using fibers with better toughness to replace glass fibers can improve the toughness of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0019] In one embodiment, the third fiber has a strength greater than that of the glass fiber.

[0020] In the composite glass fiber layer, using fibers with better strength to replace glass fibers can improve the strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0021] In one embodiment, there are multiple third fibers, and the multiple third fibers are evenly spaced along the first direction of the composite glass fiber layer to ensure the uniformity of the toughness and strength of the composite glass fiber layer, ensure the uniformity of the puncture resistance of the composite glass fiber layer, and thus ensure the uniformity of the puncture resistance of the glass fiber board.

[0022] In one embodiment, the third fiber is aramid fiber or carbon fiber.

[0023] In one embodiment, in each composite glass fiber layer, the plurality of second fibers further include one or more fourth fibers, and the fourth fibers are glass fibers.

[0024] In the composite glass fiber layer, using fibers with better toughness and strength to replace part of the glass fibers can improve the toughness and strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0025] In one embodiment, there are a plurality of third fibers and a plurality of fourth fibers, and the plurality of third fibers and the plurality of fourth fibers are alternately arranged along the first direction of the composite glass fiber layer.

[0026] In one embodiment, in each composite glass fiber layer, each second fiber is a third fiber.

[0027] In the composite glass fiber layer, using fibers with better toughness and strength to replace all glass fibers can improve the toughness and strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0028] In one embodiment, in each composite glass fiber layer, the plurality of first fibers are all glass fibers.

[0029] In one embodiment, in each composite glass fiber layer, the plurality of first fibers include one or more fifth fibers, and the toughness of the fifth fibers is greater than the toughness of the glass fibers.

[0030] In the composite glass fiber layer, using fibers with better toughness to replace glass fibers can improve the toughness of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0031] In one embodiment, the fifth fiber has a strength greater than that of the glass fiber.

[0032] In the composite glass fiber layer, using fibers with better strength to replace glass fibers can improve the strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0033] In one embodiment, there are multiple fifth fibers, and along the second direction of the composite glass fiber layer, the multiple fifth fibers are evenly spaced to ensure the uniformity of the toughness and strength of the composite glass fiber layer, to ensure the uniformity of the puncture resistance of the composite glass fiber layer, and thus to ensure the uniformity of the puncture resistance of the glass fiber board.

[0034] In one embodiment, the fifth fiber is aramid fiber or carbon fiber.

[0035] In one embodiment, in each composite glass fiber layer, the plurality of first fibers further include one or more sixth fibers, and the sixth fibers are glass fibers.

[0036] In the composite glass fiber layer, using fibers with better toughness and strength to replace part of the glass fibers can improve the toughness and strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0037] In one embodiment, in each composite glass fiber layer, each first fiber is a fifth fiber.

[0038] In the composite glass fiber layer, using fibers with better toughness and strength to replace all glass fibers can improve the toughness and strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0039] In one embodiment, the composite glass fiber layer has multiple layers, and the multiple composite glass fiber layers are evenly arranged along the thickness direction of the glass fiber layer to ensure the uniformity of the toughness and strength of the glass fiber board and the uniformity of the puncture resistance of the glass fiber board.

[0040] In one embodiment, each glass fiber layer is a composite glass fiber layer.

[0041] In a second aspect, the present application provides a fiberglass board, comprising a plurality of stacked fiberglass layers, each fiberglass layer comprising a plurality of first fibers and a plurality of second fibers, each fiberglass layer having a first direction and a second direction, the plurality of first fibers extending along the first direction of the fiberglass layer and being arranged at intervals along the second direction of the fiberglass layer, and the plurality of second fibers extending along the first direction of the fiberglass layer and being arranged at intervals along the first direction of the fiberglass layer;

[0042] The multi-layer glass fiber layer includes one or more composite glass fiber layers. In each composite glass fiber layer, the plurality of second fibers include one or more third fibers. The toughness of the third fibers is greater than that of the glass fibers.

[0043] In the composite glass fiber layer of the glass fiber board shown in this application, using fibers with better toughness to replace glass fibers can improve the toughness of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0044] In one embodiment, the first direction and the second direction are perpendicular to each other.

[0045] In one embodiment, the glass fiber layer is woven from a plurality of first fibers and a plurality of second fibers.

[0046] In one embodiment, the third fiber has a strength greater than that of the glass fiber.

[0047] In the composite glass fiber layer, using fibers with better strength to replace glass fibers can improve the strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0048] In one embodiment, there are multiple third fibers, and the multiple third fibers are evenly spaced along the first direction of the composite glass fiber layer to ensure the uniformity of the toughness and strength of the composite glass fiber layer, ensure the uniformity of the puncture resistance of the composite glass fiber layer, and thus ensure the uniformity of the puncture resistance of the glass fiber board.

[0049] In one embodiment, the third fiber is aramid fiber or carbon fiber.

[0050] In one embodiment, in each composite glass fiber layer, the plurality of second fibers further include one or more fourth fibers, and the fourth fibers are glass fibers.

[0051] In the composite glass fiber layer, using fibers with better toughness and strength to replace part of the glass fibers can improve the toughness and strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0052] In one embodiment, there are a plurality of third fibers and a plurality of fourth fibers, and the plurality of third fibers and the plurality of fourth fibers are alternately arranged along the first direction of the composite glass fiber layer.

[0053] In one embodiment, in each composite glass fiber layer, each second fiber is a third fiber.

[0054] In the composite glass fiber layer, using fibers with better toughness and strength to replace all glass fibers can improve the toughness and strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0055] In one embodiment, in each composite glass fiber layer, the plurality of first fibers are all glass fibers.

[0056] In one embodiment, in each composite glass fiber layer, the plurality of first fibers include one or more fifth fibers, and the toughness of the fifth fibers is greater than the toughness of the glass fibers.

[0057] In the composite glass fiber layer, using fibers with better toughness to replace glass fibers can improve the toughness of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0058] In one embodiment, the fifth fiber has a strength greater than that of the glass fiber.

[0059] In the composite glass fiber layer, using fibers with better strength to replace glass fibers can improve the strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0060] In one embodiment, there are multiple fifth fibers, and along the second direction of the composite glass fiber layer, the multiple fifth fibers are evenly spaced to ensure the uniformity of the toughness and strength of the composite glass fiber layer, to ensure the uniformity of the puncture resistance of the composite glass fiber layer, and thus to ensure the uniformity of the puncture resistance of the glass fiber board.

[0061] In one embodiment, the fifth fiber is aramid fiber or carbon fiber.

[0062] In one embodiment, in each composite glass fiber layer, the plurality of first fibers further include one or more sixth fibers, and the sixth fibers are glass fibers.

[0063] In the composite glass fiber layer, using fibers with better toughness and strength to replace part of the glass fibers can improve the toughness and strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0064] In one embodiment, in each composite glass fiber layer, each first fiber is a fifth fiber.

[0065] In the composite glass fiber layer, using fibers with better toughness and strength to replace all glass fibers can improve the toughness and strength of the composite glass fiber layer itself, improve the puncture resistance of the composite glass fiber layer itself, and thus improve the puncture resistance of the glass fiber board.

[0066] In one embodiment, the composite glass fiber layer has multiple layers, and the multiple composite glass fiber layers are evenly arranged along the thickness direction of the glass fiber layer to ensure the uniformity of the toughness and strength of the glass fiber board and the uniformity of the puncture resistance of the glass fiber board.

[0067] In one embodiment, each glass fiber layer is a composite glass fiber layer.

[0068] In one embodiment, the helical stagger angle between any two glass fiber layers is 0 degrees. In other words, the multiple glass fiber layers are stacked directly without being helically staggered.

[0069] In one embodiment, the spiral stagger angle between at least two glass fiber layers is greater than 0 degrees and less than 90 degrees, or greater than 90 degrees and less than 180 degrees. In other words, at least two glass fiber layers are stacked in a spiral staggered manner.

[0070] In the fiberglass board shown in the present application, at least two layers of fiberglass are stacked in a spiral staggered pattern, and the first fibers and second fibers of the at least two layers of fiberglass are staggered in a "M" shape, thereby increasing the interlayer bonding strength between the multiple fiberglass layers. When the fiberglass board is subjected to a puncture force F, the puncture force F can be transmitted along the extension direction of the first fibers and second fibers of the multiple fiberglass layers. Since the at least two layers of fiberglass are stacked in a spiral staggered pattern, the puncture force F can be transmitted in multiple directions, increasing the force-bearing area of ​​the fiberglass board, enhancing the stress diffusion effect of the fiberglass board, and increasing the synergistic toughening ability within the fiberglass board, thereby improving the puncture resistance of the fiberglass board.

[0071] In one embodiment, the spiral staggered angle between any two glass fiber layers is greater than 0 degrees and less than 180 degrees. In other words, the multiple glass fiber layers are spirally staggered and stacked, and the first fibers and second fibers of any two glass fiber layers are staggered in a "M" shape, thereby increasing the interlayer bonding force between the multiple glass fiber layers. When the glass fiber board is subjected to a puncture force F, the puncture force F can be transmitted along the extension direction of the first fibers and second fibers of the multiple glass fiber layers. Since the multiple glass fiber layers are spirally staggered and stacked, the puncture force F can be transmitted in multiple directions, which increases the force-bearing area of ​​the glass fiber board, enhances the stress diffusion effect of the glass fiber board, and increases the synergistic toughening ability inside the glass fiber board, thereby improving the puncture resistance of the glass fiber board.

[0072] In one embodiment, the spiral staggered angle between any two glass fiber layers is greater than 0 degrees and less than 90 degrees, so that the first fibers and the second fibers in the multiple glass fiber layers diverge in multiple directions, which helps to improve the stress dispersion effect of the glass fiber board and thereby improve the puncture resistance of the glass fiber board.

[0073] In one embodiment, the spiral staggered angle between any two glass fiber layers is greater than 0 degrees and less than or equal to 45 degrees, so that the first fibers and the second fibers in the multiple glass fiber layers diverge in multiple directions, which helps to improve the stress diffusion effect of the glass fiber board and thereby improve the puncture resistance of the glass fiber board.

[0074] In one embodiment, the helical stagger angle between two adjacent fiberglass layers is greater than 0 degrees and less than or equal to 45 degrees, thereby increasing the distribution density of the first fibers and the second fibers in the multiple fiberglass layers in multiple directions, thereby helping to improve the puncture resistance of the fiberglass board. For example, the angle between two adjacent fiberglass layers is 20 degrees, 30 degrees, or 45 degrees.

[0075] In a third aspect, the present application provides a back cover comprising any of the aforementioned fiberglass boards and a decorative layer, the decorative layer being disposed on the bottom surface of the fiberglass board. The fiberglass board described in the present application has excellent puncture resistance, and thus the back cover also has excellent puncture resistance. Furthermore, compared to back covers made of plastic, the fiberglass board used in the present application improves the strength of the back cover and ensures its reliability.

[0076] In a fourth aspect, the present application provides an electronic device, comprising a back cover and a frame as described above, wherein the back cover is mounted on one side of the frame.

[0077] In the electronic device described in this application, the fiberglass back cover has good puncture resistance, and thus the back cover also has good puncture resistance. In addition, compared to back covers made of plastic, the fiberglass back cover of the electronic device described in this application can improve the strength of the back cover, ensure the reliability of the back cover, and thus ensure the reliability of the electronic device.

[0078] In a fifth aspect, the present application provides a method for preparing a glass fiber board, comprising:

[0079] A plurality of glass fiber layers are provided, wherein each glass fiber layer includes a plurality of first fibers and a plurality of second fibers, each glass fiber layer has a first direction and a second direction, the plurality of first fibers extend along the first direction of the glass fiber layer and are arranged at intervals along the second direction of the glass fiber layer, and the plurality of second fibers extend along the second direction of the glass fiber layer and are arranged at intervals along the first direction of the glass fiber layer;

[0080] Stacking multiple glass fiber layers, wherein the spiral stagger angle between at least two glass fiber layers is greater than 0 degrees and less than 90 degrees, or greater than 90 degrees and less than 180 degrees;

[0081] The stacked multiple glass fiber layers are pressed together to obtain a glass fiber layer.

[0082] In one embodiment, when stacking multiple glass fiber layers, the spiral stagger angle between any two glass fiber layers is greater than 0 degrees and less than 180 degrees.

[0083] In one embodiment, when stacking multiple glass fiber layers, the spiral stagger angle between any two glass fiber layers is greater than 0 degrees and less than 90 degrees.

[0084] In one embodiment, when stacking multiple glass fiber layers, the spiral stagger angle between any two glass fiber layers is greater than 0 degrees and less than or equal to 45 degrees.

[0085] In one embodiment, when stacking multiple glass fiber layers, the spiral stagger angle between two adjacent glass fiber layers is greater than 0 degree and less than or equal to 45 degrees.

[0086] In one embodiment, during the process of pressing the stacked multiple glass fiber layers, the stacked multiple glass fiber layers are pressed using a vacuum autoclave.

[0087] In one embodiment, during the pressing of the stacked multiple glass fiber layers, the hot pressing temperature is 120 degrees Celsius, the pressure is 1 MPa, and the curing time is between 60 minutes and 90 minutes.

[0088] In a sixth aspect, the present application provides a method for preparing a glass fiber board, comprising:

[0089] A multilayer glass fiber layer is provided, wherein each glass fiber layer includes a plurality of first fibers and a plurality of second fibers, each glass fiber layer has a first direction and a second direction, the plurality of first fibers extend along the first direction of the glass fiber layer and are arranged at intervals along the second direction of the glass fiber layer, the plurality of second fibers extend along the first direction of the glass fiber layer and are arranged at intervals along the first direction of the glass fiber layer, the multilayer glass fiber layer includes one or more composite glass fiber layers, and in each composite glass fiber layer, the plurality of second fibers include one or more third fibers, and the toughness of the third fibers is greater than the toughness of the glass fibers;

[0090] Stacking multiple fiberglass layers;

[0091] The stacked multiple glass fiber layers are pressed together to obtain a glass fiber layer.

[0092] In one embodiment, when stacking multiple glass fiber layers, the spiral stagger angle between any two glass fiber layers is 0 degree.

[0093] In one embodiment, during stacking of multiple glass fiber layers, the spiral stagger angle between at least two glass fiber layers is greater than 0 degrees and less than 90 degrees, or greater than 90 degrees and less than 180 degrees.

[0094] In one embodiment, when stacking multiple glass fiber layers, the spiral stagger angle between any two glass fiber layers is greater than 0 degrees and less than 180 degrees.

[0095] In one embodiment, when stacking multiple glass fiber layers, the spiral stagger angle between any two glass fiber layers is greater than 0 degrees and less than 90 degrees.

[0096] In one embodiment, when stacking multiple glass fiber layers, the spiral stagger angle between any two glass fiber layers is greater than 0 degrees and less than or equal to 45 degrees.

[0097] In one embodiment, when stacking multiple glass fiber layers, the spiral stagger angle between two adjacent glass fiber layers is greater than 0 degree and less than or equal to 45 degrees.

[0098] In one embodiment, in the process of providing multiple glass fiber layers, each glass fiber layer is a composite glass fiber layer.

[0099] In one embodiment, during the process of pressing the stacked multiple glass fiber layers, the stacked multiple glass fiber layers are pressed using a vacuum autoclave.

[0100] In one embodiment, during the pressing of the stacked multiple glass fiber layers, the hot pressing temperature is 120 degrees Celsius, the pressure is 1 MPa, and the curing time is between 60 minutes and 90 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0101] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0102] FIG1 is a schematic structural diagram of an electronic device provided in an embodiment of the present application;

[0103] FIG2 is a schematic structural diagram of a rear cover of the electronic device shown in FIG1 ;

[0104] FIG3 is a schematic cross-sectional view of the rear cover taken along line II shown in FIG2 ;

[0105] FIG4 is a schematic planar structural diagram of the glass fiber board in the rear cover shown in FIG3 under a first embodiment;

[0106] FIG5 is a schematic diagram of the planar structure of the glass fiber layer in the glass fiber board shown in FIG4 ;

[0107] FIG6 is a schematic diagram of the planar structure of the first glass fiber layer in the glass fiber board shown in FIG4 ;

[0108] FIG7 is a schematic planar structural diagram of the second glass fiber layer in the glass fiber board shown in FIG4 ;

[0109] FIG8 is a schematic planar structural diagram of the third glass fiber layer in the glass fiber board shown in FIG4 ;

[0110] FIG9 is a schematic planar structural diagram of the fourth glass fiber layer in the glass fiber board shown in FIG4 ;

[0111] FIG10 is a force analysis diagram of the glass fiber board shown in FIG4;

[0112] FIG11 is a schematic structural diagram of the glass fiber board in the rear cover shown in FIG3 under a second embodiment;

[0113] FIG12 is a schematic diagram of the planar structure of the glass fiber layer in the glass fiber board shown in FIG11;

[0114] FIG13 is a schematic structural diagram of the glass fiber board in the rear cover shown in FIG3 under a third embodiment;

[0115] FIG14 is a schematic diagram of the planar structure of the glass fiber layer in the glass fiber board shown in FIG13;

[0116] FIG15 is a schematic planar structural diagram of the glass fiber board in the rear cover shown in FIG3 under the fourth embodiment;

[0117] FIG16 is a process flow chart of the first method for preparing a glass fiber board provided in an embodiment of the present application. DETAILED DESCRIPTION

[0118] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0119] Please refer to FIG1 , which is a schematic structural diagram of an electronic device 1000 provided in an embodiment of the present application.

[0120] The electronic device 1000 can be an electronic product such as a mobile phone, a tablet computer, a laptop computer, a car computer, a smart watch, a smart bracelet, a POS terminal (point of sales terminal), etc. Next, the embodiment of the present application is described by taking the electronic device 1000 as an example of a mobile phone. For the convenience of description, the width direction of the electronic device 1000 is defined as the X-axis direction, the length direction of the electronic device 1000 is defined as the Y-axis direction, and the thickness direction of the electronic device 1000 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

[0121] The electronic device 1000 includes a housing 100, a display module 200, a circuit board 300, a processor 400, a speaker module 500 and a camera module 600. The housing 100 is provided with a speaker hole 1001, which connects the inner and outer sides of the housing 100. The display module 200 is mounted on the housing 100. The circuit board 300, the processor 400 and the speaker module 500 are all mounted on the inner side of the housing 100. The processor 400 is mounted on the circuit board 300 and is electrically connected to the circuit board 300. Among them, the circuit board 300 can be the main board of the electronic device 1000, and the processor 400 can be the CPU (central processing unit) of the electronic device 1000. The speaker module 500 is electrically connected to the processor 400, and is used to receive the audio signal sent by the processor 400, and vibrate and make sound according to the audio signal. The sound is diffused into the external environment through the speaker hole 1001, thereby realizing the sound of the electronic device 1000. The camera module 600 is mounted on the housing 100 and exposed relative to the housing 100. The camera module 600 is electrically connected to the processor 400 and is configured to receive information acquisition signals sent by the processor 400, collect light outside the electronic device 1000, and generate corresponding image data.

[0122] Please refer to FIG. 2 , which is a schematic structural diagram of the back cover 120 of the electronic device 1000 shown in FIG. 1 .

[0123] The housing 100 includes a frame 110 and a back cover 120, and the back cover 120 is mounted on one side of the frame 110. The frame 110 is provided with a speaker hole 1001. Exemplarily, there is one speaker hole 1001. In some other embodiments, there may be more than two speaker holes 1001, and the present application does not specifically limit the number of speaker holes 1001. Among them, the back cover 120 may be a battery cover of the electronic device 1000. The back cover 120 is provided with a camera hole 1201, and the camera hole 1201 passes through the back cover 120 along the thickness direction of the back cover 120. Specifically, the back cover 120 is mounted on one side of the frame 110. The camera hole 1201 connects the inner side and the outer side of the housing 100. Exemplarily, the back cover 120 can be mounted on the frame 110 in a detachable manner to facilitate the maintenance and replacement of internal components or modules of the electronic device 1000.

[0124] The display module 200 is mounted on the other side of the frame 110. That is, the display module 200 is mounted on the side of the frame 110 that is away from the back cover 120. In other words, the display module 200 and the back cover 120 are respectively mounted on opposite sides of the frame 110. When a user uses the electronic device 1000, the display module 200 is placed toward the user and the back cover 120 is placed away from the user. The display screen can be a display screen such as an LCD (liquid crystal display) or an OLED (organic light-emitting diode display) and is used to display information such as images or text.

[0125] In this embodiment, the camera module 600 is exposed relative to the back cover 120 to serve as the rear camera module of the electronic device 1000. Specifically, the camera module 600 passes through the camera hole 1201 of the back cover 120. Part of the camera module 600 is located on the inner side of the housing 100, part of the camera module 600 is located in the camera hole 1201, and part of the camera module 600 protrudes relative to the back cover 120. It should be noted that the camera module 600 is exposed relative to the back cover 120 means that the back cover 120 does not completely cover the camera module 600. In some other embodiments, the camera module 600 may not protrude relative to the back cover 120. In this case, the camera module 600 may not pass through the camera hole 1201 of the back cover 120. Part of the camera module 600 is located on the inner side of the shell 100, and part of the camera module 600 is located in the camera hole 1201. Alternatively, the camera module 600 is completely housed on the inner side of the shell 100.

[0126] It should be noted that in existing electronic devices, fiberglass boards are generally used to make the back cover to improve the strength of the back cover and ensure the reliability of the back cover. Among them, the fiberglass board is made of multiple layers of fiberglass layers (also known as glass fiber layers) stacked and hot-pressed. The multiple layers of fiberglass layers are not staggered but directly stacked, and the interlayer bonding force between the multiple layers of fiberglass layers is poor. When the fiberglass board is subjected to a puncture force, the puncture force can only be diffused along the orthogonal direction of the glass fiber (glass fiber) in the fiberglass layer. Since the interlayer bonding force between the multiple layers of fiberglass layers is poor and the force-bearing area of ​​the fiberglass board is small, the stress diffusion effect of the fiberglass board is poor, and therefore the puncture resistance of the fiberglass board is poor. It should be understood that the puncture value of the existing fiberglass board formed by stacking four layers of fiberglass layers is about 70N.

[0127] Next, the structure of the back cover 120 of the electronic device 1000 shown in the embodiment of the present application is described in detail.

[0128] Please refer to Figure 3, which is a schematic cross-sectional view of the rear cover 120 shown in Figure 2 taken along line II. "Taking line II" means taking a line along the plane where line II is located.

[0129] The back cover 120 includes a fiberglass board 121 and a decorative layer 122. The decorative layer 122 is disposed on the bottom surface of the fiberglass board 121. The surface of the decorative layer 122 facing away from the fiberglass board 121 (i.e., the bottom surface of the decorative layer 122) serves as the exterior surface of the back cover 120. For example, the decorative layer 122 may include an ink layer or a textured layer. The decorative layer 122 is used to decorate the appearance of the back cover 120, enhancing its aesthetic appeal.

[0130] It should be noted that the directional terms such as "top" and "bottom" involved in this application are described with reference to the orientations shown in the accompanying drawings, with the direction toward the positive Z-axis being "bottom" and the direction toward the negative Z-axis being "top". They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0131] Please refer to Figures 4 and 5. Figure 4 is a schematic diagram of the planar structure of the fiberglass board 121 in the back cover 120 shown in Figure 3 under the first embodiment, and Figure 5 is a schematic diagram of the planar structure of the fiberglass layer 10 in the fiberglass board 121 shown in Figure 4. The planar structure shown in Figure 4 is a partial enlarged view of the planar structure of the fiberglass board 121.

[0132] The fiberglass board 121 includes multiple fiberglass layers 10, and the multiple fiberglass layers 10 are stacked. Wherein, multiple layers refer to two layers or more. Each fiberglass layer 10 includes multiple first fibers 11 and multiple second fibers 12, and the multiple first fibers 11 and the multiple second fibers 12 are arranged to intersect. The multiple first fibers 11 and the multiple second fibers 12 can form a fiberglass layer 10 through a weaving process. Wherein, the first fibers 11 and the second fibers 12 are both glass fibers. Exemplarily, the gram weight of each fiberglass layer 10 is greater than or equal to 100g / m 2 In some other embodiments, the weight of each glass fiber layer 10 may be less than 100 g / m 2 .

[0133] It should be noted that the glass fiber layers 10 described in the embodiments of the present application are all glass fiber layers that have undergone a resin impregnation process, and the present application does not impose any specific restrictions on the type of resin used in the resin impregnation process and the resin content.

[0134] Each glass fiber layer 10 has a first direction D1 and a second direction D2. A plurality of first fibers 11 extend along the first direction D1 and are spaced apart from one another along the second direction D2. A plurality of second fibers 12 extend along the second direction D2 and are spaced apart from one another along the first direction D1. Exemplarily, the first direction D1 and the second direction D2 are perpendicular to each other. In other embodiments, the first direction D1 and the second direction D2 may not be perpendicular to each other.

[0135] It should be noted that the qualifiers such as perpendicular and parallel mentioned in the embodiments of the present application regarding relative positional relationships are all based on the current state of the art, rather than being absolutely strict definitions in a mathematical sense. A small amount of deviation is allowed, and approximate perpendicularity is also acceptable. For example, A and B are perpendicular, which means that A and B are perpendicular or approximately perpendicular, and the angle between A and B can be between 80 degrees and 100 degrees. For example, A and B are parallel, which means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0136] Furthermore, a helical stagger angle is formed between any two fiberglass layers 10. It should be noted that the helical stagger angle between two fiberglass layers 10 is the angle between the first direction D1 of the two fiberglass layers 10, or the angle between the second direction D2 of the two fiberglass layers 10. The helical stagger angle between at least two fiberglass layers 10 is greater than 0 degrees and less than 90 degrees, or greater than 90 degrees and less than 180 degrees. In other words, at least two fiberglass layers 10 in the fiberglass board 121 are stacked in a helical stagger.

[0137] In this embodiment, the helical stagger angle between any two fiberglass layers 10 is greater than 0 degrees and less than 180 degrees. In other words, multiple fiberglass layers 10 are stacked in a spirally staggered manner. Specifically, the helical stagger angle between any two adjacent fiberglass layers 10 is greater than 0 degrees and less than or equal to 45 degrees. In other embodiments, the helical stagger angle between any two fiberglass layers 10 may also be greater than 0 degrees and less than 90 degrees, or the helical stagger angle between any two fiberglass layers 10 may also be greater than 0 degrees and less than or equal to 45 degrees.

[0138] Next, for ease of explanation, the structure of the fiberglass board 121 will be specifically described using the four fiberglass layers 10 in the fiberglass board 121 as an example. The four fiberglass layers 10 are a first fiberglass layer 10a, a second fiberglass layer 10b, a third fiberglass layer 10c, and a fourth fiberglass layer 10d. The second fiberglass layer 10b, the third fiberglass layer 10c, and the fourth fiberglass layer 10d are sequentially stacked on the surface of the first fiberglass layer 10a.

[0139] Please refer to Figures 6 to 9, Figure 6 is a schematic planar structural diagram of the first glass fiber layer 10a in the glass fiber board 121 shown in Figure 4, Figure 7 is a schematic planar structural diagram of the second glass fiber layer 10b in the glass fiber board 121 shown in Figure 4, Figure 8 is a schematic planar structural diagram of the third glass fiber layer 10c in the glass fiber board 121 shown in Figure 4, and Figure 9 is a schematic planar structural diagram of the fourth glass fiber layer 10d in the glass fiber board 121 shown in Figure 4.

[0140] In the first glass fiber layer 10a, the angle between the first direction D1 and the X-axis direction is α, and the angle between the second direction D2 and the Y-axis direction is α. That is, in the first glass fiber layer 10a, the angle between the first fibers 11 and the X-axis direction is α, and the angle between the second fibers 12 and the Y-axis direction is α.

[0141] It should be noted that during the preparation of the fiberglass board 121, before the fiberglass layers 10 are stacked, the first direction D1 of each fiberglass layer 10 is parallel to the X-axis, and the second direction D2 is parallel to the Y-axis. That is, before each fiberglass layer 10 is stacked, the angle between the first fibers 11 and the X-axis is 0 degrees, and the angle between the second fibers 12 and the Y-axis is 0 degrees. In other embodiments, before the fiberglass layers 10 are stacked, the first direction D1 may not be parallel to the X-axis, or the second direction D2 may not be parallel to the Y-axis.

[0142] Therefore, when stacking the first glass fiber layers 10 a , the first glass fiber layers 10 a may be rotated counterclockwise by α degrees before stacking.

[0143] In the second glass fiber layer 10b, the angle between the first direction D1 and the X-axis is β, and the angle between the second direction D2 and the Y-axis is β. That is, in the second glass fiber layer 10b, the angle between the first fibers 11 and the X-axis is β, and the angle between the second fibers 12 and the Y-axis is β. In this case, the helical stagger angle between the first and second glass fiber layers 10a, 10b is β-α.

[0144] Similarly, when stacking the second glass fiber layer 10b on the surface of the first glass fiber layer 10a, the second glass fiber layer 10b can be rotated β degrees counterclockwise and then stacked on the surface of the first glass fiber layer 10a so that the spiral staggered angle between the first glass fiber layer 10a and the second glass fiber layer 10b is β-α.

[0145] In the third glass fiber layer 10c, the angle between the first direction D1 and the X-axis is γ, and the angle between the second direction D2 and the Y-axis is γ. That is, in the third glass fiber layer 10c, the angle between the first fibers 11 and the X-axis is γ, and the angle between the second fibers 12 and the Y-axis is γ. In this case, the helical stagger angle between the second glass fiber layer 10b and the third glass fiber layer 10c is γ-β.

[0146] Similarly, when stacking the third glass fiber layer 10c on the surface of the second glass fiber layer 10b facing away from the first glass fiber layer 10a, the third glass fiber layer 10c can be first rotated γ degrees counterclockwise and then stacked on the surface of the second glass fiber layer 10b facing away from the first glass fiber layer 10a, so that the spiral stagger angle between the third glass fiber layer 10c and the second glass fiber layer 10b is γ-β.

[0147] In the fourth glass fiber layer 10d, the angle between the first direction D1 and the X-axis is δ, and the angle between the second direction D2 and the Y-axis is δ. That is, in the fourth glass fiber layer 10d, the angle between the first fibers 11 and the X-axis is δ, and the angle between the second fibers 12 and the Y-axis is δ. In this case, the helical stagger angle between the third glass fiber layer 10c and the fourth glass fiber layer 10d is δ-γ.

[0148] Similarly, when stacking the fourth glass fiber layer 10d on the surface of the third glass fiber layer 10c facing away from the second glass fiber layer 10b, the fourth glass fiber layer 10d can be first rotated δ degrees counterclockwise and then stacked on the surface of the third glass fiber layer 10c facing away from the second glass fiber layer 10b, so that the spiral stagger angle between the fourth glass fiber layer 10d and the third glass fiber layer 10c is δ-γ.

[0149] In this embodiment, the spiral staggered angle between adjacent glass fiber layers 10 is greater than 0 degrees and less than or equal to 45 degrees, so that the first fibers 11 and the second fibers 12 in the multi-layer glass fiber layers 10 diverge in multiple directions, thereby improving the stress dispersion effect of the glass fiber board 121. Exemplarily, the spiral staggered angle between adjacent glass fiber layers 10 is 20 degrees. For example, α = 20 degrees, β = 40 degrees, γ = 60 degrees, and δ = 80 degrees. At this time, β-α = γ-β = δ-γ = 20 degrees. In other words, the spiral staggered angle between the second glass fiber layer 10b and the first glass fiber layer 10a, the spiral staggered angle between the third glass fiber layer 10c and the second glass fiber layer 10b, and the spiral staggered angle between the fourth glass fiber layer 10d and the third glass fiber layer 10c are all 20 degrees. The spiral angle between the third glass fiber layer 10c and the first glass fiber layer 10a is 40 degrees, the spiral angle between the fourth glass fiber layer 10d and the first glass fiber layer 10a is 60 degrees, and the spiral angle between the fourth glass fiber layer 10d and the second glass fiber layer 10b is 40 degrees.

[0150] In some other embodiments, the spiral staggered angle between adjacent glass fiber layers 10 may also be 30 degrees, for example, α = 30 degrees, β = 60 degrees, γ = 90, δ = 120 degrees, in which case β-α = γ-β = δ-γ = 30 degrees; or, the spiral staggered angle between adjacent glass fiber layers 10 may also be 45 degrees, for example, α = 45 degrees, β = 90 degrees, γ = 135, δ = 180 degrees, in which case β-α = γ-β = δ-γ = 45 degrees.

[0151] Please refer to Figure 10, which is a force analysis diagram of the glass fiber board 121 shown in Figure 4. The dotted line with an arrow shown in Figure 9 is the transmission direction of the puncture force F.

[0152] In the glass fiber board 121 shown in this embodiment, the spiral staggered angle between two adjacent glass fiber layers 10 is greater than 0 degrees and less than or equal to 45 degrees, the multiple glass fiber layers 10 are spirally staggered and stacked, and the first fibers 11 and the second fibers 12 of the multiple glass fiber layers 10 are staggered in a "M" shape. That is, in the multiple glass fiber layers 10, the first fibers 11 do not extend along the X-axis direction, and the second fibers 12 do not extend along the Y-axis direction. The spirally staggered stacking of the multiple glass fiber layers 10 increases the interlayer bonding force between the multiple glass fiber layers 10. When the glass fiber board 121 is subjected to a puncture force F, the puncture force F can be transmitted along the extension direction of the first fibers 11 and the second fibers 12 of the multiple glass fiber layers 10. Since the multiple glass fiber layers 10 are spirally staggered and stacked, the puncture force F can be transmitted not only along the X-axis and the Y-axis directions, but also along other directions.

[0153] Specifically, compared to existing fiberglass panels, the puncture force F can be transmitted in multiple directions, increasing the force-bearing area of ​​the fiberglass panel 121. This enhances the stress dispersion within the fiberglass panel 121 and increases the synergistic toughening capacity within the panel 121, thereby improving the puncture resistance of the panel 121 and contributing to the lightweight and thin design of the electronic device 1000. The puncture resistance of the fiberglass panel 121 ranges from 80N to 85N. Compared to existing fiberglass panels, the puncture resistance of the fiberglass panel 121 in this embodiment can be improved by over 14%.

[0154] Please refer to Figures 11 and 12. Figure 11 is a schematic structural diagram of the glass fiber board 121 shown in Figure 3 under a second embodiment, and Figure 12 is a schematic planar structural diagram of the glass fiber layer 10 in the glass fiber board 121 shown in Figure 11. The structure shown in Figure 11 is a partial enlarged view of the structure of the glass fiber board 121.

[0155] The fiberglass board 121 shown in this embodiment differs from the fiberglass board 121 shown in the first embodiment described above in that the helical stagger angle between any two fiberglass layers 10 is 0 degrees. In other words, the multiple fiberglass layers 10 of the fiberglass board 121 are stacked directly without staggering. It should be noted that Figure 11 only shows four fiberglass layers 10 in the fiberglass board 121, and this does not constitute a limit on the actual number of fiberglass layers 10 in the fiberglass board 121.

[0156] For example, in each fiberglass layer 10, the first direction D1 is parallel to the X-axis, and the second direction D2 is parallel to the Y-axis. That is, in each fiberglass layer 10, the angle between the first fibers 11 and the X-axis is 0 degrees, and the angle between the second fibers 12 and the Y-axis is 0 degrees. In other embodiments, in each fiberglass layer 10, the first direction D1 may not be parallel to the X-axis, or the second direction D2 may not be parallel to the Y-axis.

[0157] In this embodiment, the multilayer glass fiber layer 10 includes one or more composite glass fiber layers. Specifically, each of the multiple glass fiber layers 10 is a composite glass fiber layer. In each composite glass fiber layer 10, the multiple first fibers 11 are glass fibers. The multiple second fibers 12 include multiple third fibers 13 and multiple fourth fibers 14. The multiple fourth fibers 14 are all glass fibers. The toughness of the third fibers 13 is greater than that of the glass fibers, and the strength of the third fibers 13 is greater than that of the glass fibers. Exemplarily, the third fibers 13 are aramid fibers or carbon fibers.

[0158] The plurality of third fibers 13 are evenly spaced along the first direction D1 to ensure uniform toughness and strength of the fiberglass layer 10, uniform puncture resistance of the fiberglass layer 10, and thus uniform puncture resistance of the fiberglass board 121. For example, the plurality of third fibers 13 and the plurality of fourth fibers 14 are alternately arranged along the first direction D1. In other embodiments, the plurality of third fibers 13 may be unevenly spaced along the first direction D1, or the plurality of second fibers 12 may include only one third fiber 13.

[0159] In other embodiments, the plurality of first fibers 11 may also include a plurality of fifth fibers and one or more sixth fibers. The sixth fibers are glass fibers. The fifth fibers have greater toughness than glass fibers, and the fifth fibers have greater strength than glass fibers. Exemplarily, the sixth fibers are aramid fibers or carbon fibers. In this case, the plurality of fifth fibers are evenly spaced along the second direction D2. Alternatively, the plurality of first fibers 11 may include one fifth fiber, or all of the plurality of first fibers 11 may be fifth fibers.

[0160] Compared to existing fiberglass boards, the fiberglass board 121 shown in this embodiment partially replaces the multiple second fibers 12 of the fiberglass layer 10 with third fibers 13, which have greater toughness and strength. This improves the strength and toughness of the fiberglass layer 10 itself, thereby increasing the strength and toughness of the fiberglass board 121 and enhancing its puncture resistance. The puncture resistance of the fiberglass board 121 is between 80N and 100N. Compared to existing fiberglass boards, the puncture resistance of the fiberglass board 121 shown in this embodiment is improved by over 14%.

[0161] In some other embodiments, the multi-layer glass fiber layer 10 may include a composite glass fiber layer, or the multi-layer glass fiber layer 10 includes multiple composite glass fiber layers and one or more ordinary glass fiber layers, in which the multiple first fibers 11 and the multiple second fibers 12 are all glass fibers, and the multiple composite glass fiber layers are evenly arranged along the thickness direction of the glass fiber board 121 to ensure the uniformity of the toughness and strength of the glass fiber board 121 and the uniformity of the puncture resistance of the glass fiber board 121, or the multiple composite glass fiber layers may also be unevenly arranged along the thickness direction of the glass fiber board 121.

[0162] Please refer to Figures 13 and 14. Figure 13 is a schematic structural diagram of the fiberglass board 121 shown in Figure 3 under a third embodiment, and Figure 14 is a schematic planar structural diagram of the fiberglass layer 10 in the fiberglass board 121 shown in Figure 13. The structure shown in Figure 13 is a partial enlarged view of the structure of the fiberglass board 121.

[0163] The fiberglass board 121 shown in this embodiment differs from the fiberglass board 121 shown in the second embodiment described above in that, in each fiberglass layer 10, the plurality of second fibers 12 are all third fibers 13, i.e., the second fibers 12 are aramid fibers or carbon fibers, thereby further enhancing the toughness and strength of the fiberglass layer 10 itself, thereby enhancing the toughness and strength of the fiberglass board 121 and improving the puncture resistance of the fiberglass board 121. It should be noted that the other structures of the fiberglass board 121 shown in this embodiment can refer to the corresponding description of the fiberglass board 121 shown in the second embodiment described above and will not be repeated here.

[0164] Please refer to Figure 15, which is a schematic diagram of the planar structure of the glass fiber board 121 shown in Figure 3 under a fourth embodiment. The planar structure shown in Figure 15 is a partial enlarged view of the planar structure of the glass fiber board 121.

[0165] The fiberglass board 121 shown in this embodiment differs from the fiberglass board 121 shown in the second embodiment described above in that the spiral staggered angle between at least two fiberglass layers 10 is greater than 0 degrees and less than 90 degrees, or greater than 90 degrees and less than 180 degrees. In other words, at least two fiberglass layers 10 in the fiberglass board 121 are stacked in a spiral staggered manner. It should be noted that the structure of the composite fiberglass layer in the fiberglass board 121 shown in this embodiment can refer to the relevant description of the second embodiment described above, and the structure of the spiral staggered angle between the two fiberglass layers 10 in the fiberglass board 121 can refer to the relevant description of the first embodiment described above, and will not be repeated here.

[0166] Compared to existing fiberglass boards, the fiberglass board 121 shown in this embodiment not only partially replaces the multiple second fibers 12 of the fiberglass layer 10 with third fibers 13 of greater toughness and strength, thereby improving the strength and toughness of the fiberglass layer 10 itself, thereby improving the strength and toughness of the fiberglass board 121 and the puncture resistance of the fiberglass board 121. Furthermore, at least two fiberglass layers 10 are spirally staggered, and the first fibers 11 and second fibers 12 of at least two fiberglass layers 10 are staggered in a "M" shape, which increases the interlayer bonding strength between the multiple fiberglass layers 10.

[0167] As shown in Figure 10, when a fiberglass board 121 is subjected to a puncture force F, the puncture force F is transmitted along the extension direction of the first fibers 11 and second fibers 12 of the multiple fiberglass layers 10. Because at least two fiberglass layers 10 are spirally interlaced, the puncture force F can be transmitted not only along the X-axis and Y-axis directions, but also in other directions. In other words, compared to existing fiberglass boards, the puncture force F can be transmitted in multiple directions, increasing the force-bearing area of ​​the fiberglass board 121. This enhances the stress dispersion effect of the fiberglass board 121 and increases the synergistic toughening capacity within the fiberglass board 121, thereby improving the puncture resistance of the fiberglass board 121. The puncture resistance of the fiberglass board 121 ranges from 100N to 120N. Compared to existing fiberglass boards, the puncture resistance of the fiberglass board 121 shown in this embodiment can be improved by over 21%.

[0168] In the electronic device 1000 shown in the embodiment of the present application, the fiberglass sheet 121 of the back cover 120 has good puncture resistance, and thus the back cover 120 also has good puncture resistance. In addition, compared to existing back covers made of plastic, the back cover 120 shown in the present application is made of fiberglass sheet 121, which helps to improve the strength of the back cover 120, ensure the reliability of the back cover 120, and thus ensure the reliability of the electronic device 1000.

[0169] Please refer to FIG. 16 , which is a process flow chart of the first method for preparing a glass fiber board provided in an embodiment of the present application.

[0170] The method for preparing the glass fiber board shown in this embodiment is used to prepare the glass fiber board 121 shown in the first embodiment. The method for preparing the glass fiber board includes steps S1 to S3.

[0171] Step S1, providing a plurality of glass fiber layers 10. As shown in FIG5 , each glass fiber layer 10 includes a plurality of first fibers 11 and a plurality of second fibers 12. The plurality of first fibers 11 and the plurality of second fibers 12 are woven to form the glass fiber layer 10. The first fibers 11 and the second fibers 12 are both glass fibers. For example, the weight of the glass fiber layer 10 is greater than or equal to 100 g / m 2 In some other embodiments, the weight of the glass fiber layer 10 may be less than 100 g / m 2.

[0172] Each glass fiber layer 10 has a first direction D1 and a second direction D2. A plurality of first fibers 11 extend along the first direction D1 and are spaced apart from one another along the second direction D2. A plurality of second fibers 12 extend along the second direction D2 and are spaced apart from one another along the first direction D1. Exemplarily, the first direction D1 and the second direction D2 are perpendicular to each other. In other embodiments, the first direction D1 and the second direction D2 may not be perpendicular to each other.

[0173] It should be noted that the glass fiber layers 10 described in the embodiments of the present application are all glass fiber layers that have undergone a resin impregnation process, and the embodiments of the present application do not impose any specific restrictions on the resin system and resin content used in the resin impregnation process.

[0174] Step S2, stacking multiple layers of glass fiber layers 10. Specifically, at least two layers of glass fiber layers 10 are spirally staggered and stacked. In this embodiment, the spiral staggered angle between at least two types of glass fiber layers 10 is greater than 0 degree and less than 90 degrees, or, greater than 90 degrees and less than 180 degrees. Specifically, the spiral staggered angle between any two layers of glass fiber layers 10 is greater than 0 degree and less than 180 degrees. Among them, the spiral staggered angle between two adjacent layers of glass fiber layers 10 is greater than 0 degree and less than or equal to 45 degrees. In some other embodiments, the spiral staggered angle between any two layers of glass fiber layers 10 may also be greater than 0 degree and less than 90 degrees, or, the spiral staggered angle between any two layers of glass fiber layers 10 may also be greater than 0 degree and less than or equal to 45 degrees.

[0175] Among them, the multi-layer glass fiber layer 10 includes a first glass fiber layer 10a (as shown in Figure 6), a second glass fiber layer 10b (as shown in Figure 7), a third glass fiber layer 10c (as shown in Figure 8) and a fourth glass fiber layer 10d (as shown in Figure 9). The spiral staggered angle between the second glass fiber layer 10b and the first glass fiber layer 10a is β-α, the spiral staggered angle between the third glass fiber layer 10c and the second glass fiber layer 10b is γ-β, and the spiral staggered angle between the fourth glass fiber layer 10d and the third glass fiber layer 10c is δ-γ.

[0176] Exemplarily, the spiral stagger angle between adjacent glass fiber layers 10 is 20 degrees. For example, α = 20 degrees, β = 40 degrees, γ = 60 degrees, and δ = 80 degrees. In other words, before stacking the first glass fiber layer 10a, the second glass fiber layer 10b, the third glass fiber layer 10c, and the fourth glass fiber layer 10d, the first glass fiber layer 10a is rotated 20 degrees, the second glass fiber layer 10b is rotated 40 degrees, the third glass fiber layer 10c is rotated 60 degrees, and the fourth glass fiber layer 10d is rotated 80 degrees. Then, the first glass fiber layer 10a, the second glass fiber layer 10b, the third glass fiber layer 10c, and the fourth glass fiber layer 10d are stacked in sequence.

[0177] In some other embodiments, the spiral staggered angle between adjacent glass fiber layers 10 may also be 30 degrees. Before stacking the first glass fiber layer 10a, the second glass fiber layer 10b, the third glass fiber layer 10c, and the fourth glass fiber layer 10d, the first glass fiber layer 10a may be rotated 30 degrees, the second glass fiber layer 10b may be rotated 60 degrees, the third glass fiber layer 10c may be rotated 90 degrees, and the fourth glass fiber layer 10d may be rotated 120 degrees. Alternatively, the first glass fiber layer 10a may be rotated 45 degrees, the second glass fiber layer 10b may be rotated 90 degrees, the third glass fiber layer 10c may be rotated 135 degrees, and the fourth glass fiber layer 10d may be rotated 180 degrees, and then the first glass fiber layer 10a, the second glass fiber layer 10b, the third glass fiber layer 10c, and the fourth glass fiber layer 10d may be stacked in sequence.

[0178] In step S3, the stacked multiple glass fiber layers 10 are pressed together to obtain a glass fiber board 121, as shown in FIG4 . Specifically, a vacuum autoclave is used to press the stacked multiple glass fiber layers 10 together to obtain the glass fiber board 121. The autoclave temperature is approximately 120 degrees Celsius, the pressure is 1 MPa, and the curing time is between 60 and 90 minutes.

[0179] The embodiment of the present application also provides a second method for preparing a glass fiber board, which is used to prepare the glass fiber board 121 shown in the second embodiment described above.

[0180] The method for preparing the glass fiber board shown in this embodiment includes steps S1 to S3.

[0181] Step S1: Provide multiple glass fiber layers 10. As shown in Figure 12, each glass fiber layer 10 includes a plurality of first fibers 11 and a plurality of second fibers 12. The plurality of first fibers 11 and the plurality of second fibers 12 are woven together to form the glass fiber layer 10. Each glass fiber layer 10 has a first direction D1 and a second direction D2. Exemplarily, the first direction D1 is parallel to the X-axis, and the second direction D2 is parallel to the Y-axis. The plurality of first fibers 11 extend along the first direction D1 and are spaced apart from each other along the second direction D2.

[0182] In this embodiment, the multilayer glass fiber layer 10 includes one or more composite glass fiber layers. Specifically, each of the multiple glass fiber layers 10 is a composite glass fiber layer. In each composite glass fiber layer 10, the multiple first fibers 11 are glass fibers. The multiple second fibers 12 include multiple third fibers 13 and multiple fourth fibers 14. The multiple fourth fibers 14 are all glass fibers. The toughness of the third fibers 13 is greater than that of the glass fibers, and the strength of the third fibers 13 is greater than that of the glass fibers. Exemplarily, the third fibers 13 are aramid fibers or carbon fibers.

[0183] In particular, along the first direction D1, the plurality of third fibers 13 are evenly spaced to ensure uniform toughness and strength of the glass fiber layer 10, ensure uniform puncture resistance of the glass fiber layer 10, and thereby ensure uniform puncture resistance of the glass fiber board 121. Exemplarily, along the first direction D1, the plurality of third fibers 13 and the plurality of fourth fibers 14 are alternately arranged. In other embodiments, along the first direction D1, the plurality of third fibers 13 may be unevenly spaced, or the plurality of second fibers 12 may include only one third fiber 13, or all of the plurality of second fibers 12 may be fourth fibers 14.

[0184] In other embodiments, the plurality of first fibers 11 may also include a plurality of fifth fibers and one or more sixth fibers. The sixth fibers are glass fibers. The fifth fibers have greater toughness than glass fibers, and the fifth fibers have greater strength than glass fibers. Exemplarily, the sixth fibers are aramid fibers or carbon fibers. In this case, the plurality of fifth fibers are evenly spaced along the second direction D2. Alternatively, the plurality of first fibers 11 may include one fifth fiber, or all of the plurality of first fibers 11 may be fifth fibers.

[0185] In this embodiment, step S1 includes steps S11 to S13.

[0186] Step S11, providing a fiber cloth. The fiber cloth includes a plurality of radial fibers and a plurality of weft fibers. The plurality of weft fibers and the plurality of radial fibers are formed into the fiber cloth through a weaving process. The plurality of weft fibers are all glass fibers. The plurality of radial fibers include a plurality of first fibers and a plurality of second fibers. The plurality of second fibers are all glass fibers. The toughness and strength of the first fibers are both greater than those of the second fibers. Exemplarily, the first fibers are aramid fibers or carbon fibers. It should be noted that the thickness of the glass fibers, aramid fibers and carbon fibers in the fiber cloth shown in the embodiment of the present application is not specifically limited, and the fiber cloth can be formed by a weaving process.

[0187] Step S12: Impregnate the fiber cloth with resin. Specifically, the fiber cloth is impregnated with epoxy resin. The resin content is approximately 50%, and the thickness of the impregnated fiber cloth is approximately 0.1 mm. In other embodiments, the fiber cloth may be impregnated with other types of resins and / or with other resin contents. This embodiment of the present application does not impose any specific restrictions on the type of resin, the resin content, or the thickness of the fiber cloth.

[0188] In step S13, the impregnated fiber cloth is dried and rolled, and then cut to form multiple glass fiber layers 10. Specifically, the multiple weft fibers of the fiber cloth form the multiple first fibers 11 of the glass fiber layer 10, and the multiple radial fibers of the fiber cloth form the multiple second fibers 12 of the glass fiber layer 10. Furthermore, the multiple first fibers of the fiber cloth form the multiple third fibers 13 of the glass fiber layer 10, and the multiple second fibers of the fiber cloth form the multiple fourth fibers of the glass fiber layer 10.

[0189] Step S2: stacking multiple glass fiber layers 10. Specifically, stacking multiple glass fiber layers 10 directly. The spiral stagger angle between any two glass fiber layers 10 is 0 degrees.

[0190] In step S3, the stacked multiple glass fiber layers 10 are pressed together to form a glass fiber board 121, as shown in FIG11 . Specifically, the stacked multiple glass fiber layers 10 are pressed together using a vacuum autoclave process to form the glass fiber board 121. The autoclave temperature is approximately 120 degrees Celsius, the pressure is 1 MPa, and the curing time is between 60 and 90 minutes.

[0191] The embodiment of the present application also provides a third method for preparing a glass fiber board. The third method for preparing a glass fiber board is used to prepare the glass fiber board 121 shown in the fourth embodiment.

[0192] The method for preparing the glass fiber board shown in this embodiment includes steps S1 to S3.

[0193] Step S1, providing a multi-layer glass fiber layer 10. It should be noted that step S1 shown in this embodiment is the same as step S1 of the second method for preparing the glass fiber board, and will not be described in detail here.

[0194] Step S2, stacking multiple layers of glass fiber layers 10. Specifically, at least two layers of glass fiber layers 10 are spirally staggered and stacked. In this embodiment, the spiral staggering angle between at least two types of glass fiber layers 10 is greater than 0 degrees and less than 90 degrees, or greater than 90 degrees and less than 180 degrees. Specifically, the spiral staggering angle between any two layers of glass fiber layers 10 is greater than 0 degrees and less than 180 degrees. Among them, the spiral staggering angle between two adjacent layers of glass fiber layers 10 is greater than 0 degrees and less than or equal to 45 degrees. It should be noted that step S2 shown in this embodiment is the same as step S2 of the above-mentioned first method for preparing glass fiber board, and will not be repeated here.

[0195] In step S3, the stacked multiple glass fiber layers 10 are pressed together to form a glass fiber board 121, as shown in FIG15 . Specifically, the stacked multiple glass fiber layers 10 are pressed together using a vacuum autoclave process to form the glass fiber board 121. The autoclave temperature is approximately 120 degrees Celsius, the pressure is 1 MPa, and the curing time is between 60 and 90 minutes.

[0196] The above description is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application; the embodiments of this application and the features of the embodiments can be combined with each other unless there is a conflict. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A glass fiber board, characterized in that: The invention comprises a plurality of stacked fiberglass layers, each of which comprises a plurality of first fibers and a plurality of second fibers, wherein the plurality of first fibers and the plurality of second fibers are intersectingly arranged, each of which has a first direction and a second direction, wherein the plurality of first fibers extend along the first direction of the fiberglass layer and are arranged at intervals along the second direction of the fiberglass layer, and the plurality of second fibers extend along the second direction of the fiberglass layer and are arranged at intervals along the first direction of the fiberglass layer, and wherein the spiral stagger angle between at least two fiberglass layers is greater than 0 degrees and less than 90 degrees, or greater than 90 degrees and less than 180 degrees; The spiral staggered angle between the two glass fiber layers is the angle between the first directions of the two glass fiber layers, or the spiral staggered angle between the two glass fiber layers is the angle between the second directions of the two glass fiber layers.

2. The glass fiber board according to claim 1, characterized in that The spiral staggered angle between any two glass fiber layers is greater than 0 degree and less than 180 degrees.

3. The glass fiber board according to claim 2, characterized in that: The spiral staggered angle between any two glass fiber layers is greater than 0 degree and less than 90 degrees.

4. The glass fiber board according to claim 3, characterized in that The spiral stagger angle between any two glass fiber layers is greater than 0 degree and less than or equal to 45 degrees.

5. The glass fiber board according to claim 4, characterized in that: The spiral staggered angle between two adjacent glass fiber layers is greater than 0 degree and less than or equal to 45 degrees.

6. The glass fiber board according to any one of claims 1 to 5, characterized in that: In each of the glass fiber layers, the first fibers and the second fibers are all glass fibers.

7. The glass fiber board according to any one of claims 1 to 5, characterized in that: The multiple glass fiber layers include one or more composite glass fiber layers. In each composite glass fiber layer, the plurality of second fibers include one or more third fibers. The toughness of the third fibers is greater than that of the glass fibers.

8. The glass fiber board according to claim 7, characterized in that: The third fiber has a strength greater than that of the glass fiber.

9. The glass fiber board according to claim 7 or 8, characterized in that: There are a plurality of third fibers, and the plurality of third fibers are evenly spaced and arranged along the first direction of the composite glass fiber layer.

10. The glass fiber board according to any one of claims 7 to 9, characterized in that: The third fiber is aramid fiber or carbon fiber.

11. The glass fiber board according to any one of claims 7 to 10, characterized in that: In each of the composite glass fiber layers, the plurality of second fibers further include one or more fourth fibers, and the fourth fibers are glass fibers.

12. The glass fiber board according to claim 11, characterized in that There are a plurality of the third fibers and a plurality of the fourth fibers, and the plurality of the third fibers and the plurality of the fourth fibers are alternately arranged along the first direction of the composite glass fiber layer.

13. The glass fiber board according to any one of claims 7 to 10, characterized in that: In each of the composite glass fiber layers, each of the second fibers is the third fiber.

14. The glass fiber board according to any one of claims 7 to 13, characterized in that: In each of the composite glass fiber layers, the first fibers are all glass fibers.

15. The glass fiber board according to any one of claims 7 to 13, characterized in that: In each of the composite glass fiber layers, the plurality of first fibers include one or more fifth fibers, and the toughness of the fifth fibers is greater than the toughness of the glass fibers.

16. The glass fiber board according to any one of claims 7 to 15, characterized in that: Each of the glass fiber layers is the composite glass fiber layer.

17. A glass fiber board, characterized in that: The fiberglass layer comprises a plurality of stacked fiberglass layers, each of the fiberglass layers comprises a plurality of first fibers and a plurality of second fibers, each of the fiberglass layers has a first direction and a second direction, the plurality of first fibers extend along the first direction of the fiberglass layer and are arranged at intervals along the second direction of the fiberglass layer, and the plurality of second fibers extend along the first direction of the fiberglass layer and are arranged at intervals along the first direction of the fiberglass layer; The multi-layer glass fiber layer includes one or more composite glass fiber layers. In each composite glass fiber layer, the plurality of second fibers include one or more third fibers. The toughness of the third fibers is greater than the toughness of the glass fibers.

18. The glass fiber board according to claim 17, characterized in that The spiral staggered angle between any two glass fiber layers is 0 degree.

19. A back cover, characterized in that: It comprises the glass fiber board according to any one of claims 1 to 18 and a decorative layer, wherein the decorative layer is arranged on the bottom surface of the glass fiber board.

20. An electronic device, characterized in that: It comprises the back cover and the frame as described in claim 19, wherein the back cover is installed on one side of the frame.

21. A method for preparing a glass fiber board, characterized in that: include: Provide multiple glass fiber layers, wherein each of the glass fiber layers comprises a plurality of first fibers and a plurality of second fibers, each The glass fiber layers each have a first direction and a second direction, a plurality of the first fibers each extend along the first direction of the glass fiber layer and are arranged at intervals along the second direction of the glass fiber layer, and a plurality of the second fibers each extend along the second direction of the glass fiber layer and are arranged at intervals along the first direction of the glass fiber layer; Stacking multiple glass fiber layers, wherein the spiral stagger angle of at least two of the glass fiber layers is greater than 0 degrees and less than 90 degrees, or greater than 90 degrees and less than 180 degrees; The stacked multiple glass fiber layers are pressed together to obtain a glass fiber layer.

22. A method for preparing a glass fiber board, characterized in that: include: A multilayer glass fiber layer is provided, wherein each of the glass fiber layers includes a plurality of first fibers and a plurality of second fibers, each of the glass fiber layers has a first direction and a second direction, the plurality of first fibers extend along the first direction of the glass fiber layer and are arranged at intervals along the second direction of the glass fiber layer, the plurality of second fibers extend along the first direction of the glass fiber layer and are arranged at intervals along the first direction of the glass fiber layer, the multilayer glass fiber layer includes one or more composite glass fiber layers, and in each of the composite glass fiber layers, the plurality of second fibers include one or more third fibers, and the toughness of the third fibers is greater than the toughness of the glass fibers; stacking multiple glass fiber layers; The stacked multiple glass fiber layers are pressed together to obtain a glass fiber layer.

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