Electronic product protective shell, sheet thereof and method for manufacturing sheet

Abstract

The invention relates to an electronic product protective shell, a sheet thereof and a method for manufacturing the sheet. The sheet material comprises a sheet material main body (11) with the thickness not exceeding 0.9 mm, and the sheet material main body (11) comprises a hot melting matrix and reinforcing fibers contained in the hot melting matrix; the sheet main body (11) is provided with an accommodating cavity and a sheet-shaped magnet (21) accommodated in the accommodating cavity; the sheet main body (11) is provided with a first filling part (113), a second filling part (114) and a third filling part (115); the first filling part (113) enters the space between the sheet-shaped magnet (21) and the cavity wall of the accommodating cavity; the second filling part (114) and the third filling part (115) respectively cover the front surface and the back surface of the sheet-shaped magnet (21); and the three filling parts are connected with the part, positioned on the outer side of the accommodating cavity, of the sheet main body (11) to form an integral body, so that the sheet-shaped magnet (21) is embedded in the integral body. According to the invention, the reliability of connection between the sheet-shaped magnet and the sheet main body can be improved, and the influence caused by uneven thickness of the sheet-shaped magnet can be reduced or eliminated.

Description

Electronic product protective shell, sheet thereof, and method for manufacturing sheet Technical Field

[0001] The present invention relates to a sheet material and a method for manufacturing the same, and more particularly to a sheet material with a magnetic attraction function and a method for manufacturing the sheet material. Background Art

[0002] With the advancement of magnetic charging technology, electronic product cases with magnetic charging capabilities have become increasingly popular. Regardless of whether an electronic product has a magnetic module or not, as long as it has a wireless charging module, it can be wirelessly charged using a magnetic case. For portable electronic product cases, such as mobile phone cases, users prefer thin and lightweight designs for a comfortable grip. However, to achieve sufficient magnetic attraction, the magnets in the phone case must be of a certain thickness, typically using sheet magnets. When installing sheet magnets into the recesses within the phone case, if the thickness of the sheet magnets doesn't perfectly match the recesses, bumps or dents can form on the surface of the case, affecting its aesthetics. This is especially true when using multiple sheet magnets, making thickness uniformity even more difficult. Furthermore, the reliability of the connection between multiple sheet magnets and the recesses in the phone case is reduced. Therefore, a better solution is urgently needed. Technical issues

[0003] One purpose of the present application is to improve the reliability of assembling a sheet magnet in a sheet material and reduce or eliminate the influence caused by the uneven thickness of the sheet magnet. Technical Solutions

[0004] To this end, the first aspect of the present application provides a sheet material, including a sheet body, the thickness of the sheet body not exceeding 0.9 mm; the sheet body includes a hot-melt matrix and reinforcing fibers contained in the hot-melt matrix; the sheet body is provided with a receiving cavity and a sheet magnet received in the receiving cavity, the thickness of the sheet magnet being less than the thickness of the sheet body; the sheet body has a first filling part entering between the sheet magnet and the cavity wall of the receiving cavity, a second filling part covering the front side of the sheet magnet, and a third filling part covering the back side of the sheet magnet; the first filling part connects the second filling part and the third filling part, and is connected to the part of the sheet body located outside the receiving cavity to form a one-piece whole, so that the sheet magnet is embedded therein.

[0005] In one embodiment of the present invention, the front and back surfaces of the sheet magnet are completely covered by the second filling part and the third filling part respectively, so that the sheet body has a uniform thickness.

[0006] In one embodiment of the present invention, the first filling portion is formed by the hot-melt matrix of the sheet body entering between the sheet magnet and the cavity wall of the receiving cavity, and the first filling portion is connected to the portion of the sheet body located outside the receiving cavity to form a one-piece whole.

[0007] In one embodiment of the present invention, the second filling portion and the third filling portion are formed by the hot-melt matrix of the sheet body spreading along the surface of the sheet-shaped magnet when or after the first filling portion is formed.

[0008] In one embodiment of the present invention, the receiving cavity accommodates a plurality of the sheet magnets, which are arranged at intervals along the plane direction of the sheet body; the sheet body has a fourth filling portion that enters the gap between two adjacent sheet magnets; the fourth filling portion is connected to the first filling portion, the second filling portion, and the third filling portion to form a one-piece whole.

[0009] In one embodiment of the present invention, the plurality of sheet magnets are arranged in a ring shape; the sheet body further includes a central portion surrounded by the plurality of sheet magnets, and the central portion is connected to the first filling portion, the second filling portion, the third filling portion, and the fourth filling portion to form a one-piece whole.

[0010] In one embodiment of the present invention, the thickness of the sheet magnet is 0.05-0.5 mm smaller than the thickness of the sheet body.

[0011] In one embodiment of the present invention, it further includes: an inner shell covering the inner surface of the sheet body and connected to the sheet body into a one-piece integral body, wherein the inner shell covers the position corresponding to the sheet magnet to strengthen the connection between the sheet magnet and the sheet body.

[0012] In one embodiment of the present invention, it further includes: a shell covering the outer surface of the sheet body and connected to the sheet body into a one-piece whole, the shell covering the position corresponding to the sheet magnet to strengthen the connection between the sheet magnet and the sheet body.

[0013] In a second aspect of the present application, there is provided an electronic product protective case using the sheet material defined in the first aspect of the present application, wherein at least a portion of the protective case includes the sheet material described in the first aspect of the present application.

[0014] In a third aspect of the present application, a method for manufacturing a sheet material is provided, comprising: step S101, impregnating a reinforced fiber sheet with a hot-melt matrix to obtain a first sheet material; step S103, providing a receiving cavity in the first sheet material for receiving a sheet magnet, wherein the receiving cavity is a through hole extending through the thickness direction of the first sheet material or a blind groove not extending through the thickness direction of the first sheet material; step S105, assembling a sheet magnet into the receiving cavity, wherein the thickness of the sheet magnet is less than the thickness of the first sheet material; step S107, placing the first sheet material and the sheet magnet assembled therein as a whole between two release films, and performing hot pressing and curing in a vacuum autoclave, so that the hot-melt matrix of the first sheet material flows into the space between the sheet magnet and the wall of the receiving cavity in a molten state to form a first filling portion, and flows to the two surfaces of the sheet magnet to form a second filling portion and a third filling portion, so that the sheet magnet is embedded therein to obtain a sheet material body with a thickness not exceeding 0.9 mm.

[0015] In one embodiment of the present invention, the method further includes step S109, adding an outer shell and / or an inner shell to the sheet body to form a one-piece sheet; the inner shell is covered on the inner surface of the sheet body through a coating process or a hot pressing process, and has a thickness of 0.05~0.15 mm or 10%~35% of the thickness of the sheet body. Beneficial effects

[0016] In the implementation of the present invention, the sheet body has a first filling portion between the sheet magnet and the cavity wall of the receiving cavity, and has a second filling portion and a third filling portion on the front and back sides of the sheet magnet respectively, and the first filling portion, the second filling portion and the third filling portion are connected to the portion of the sheet body located outside the receiving cavity to form a one-piece whole, which can improve the reliability of the connection between the sheet magnet and the sheet body. When this sheet body is used to manufacture mobile phone protection, the present invention can reduce or eliminate the impact of uneven thickness of the sheet magnet, such as the impact caused by the uneven thickness of the sheet magnet and the magnet receiving cavity thickness of the mobile phone protective case, or the impact caused by the unevenness or incomplete flushing of the thickness of the sheet magnet and the magnet receiving cavity of the mobile phone protective case. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To further explain the specific technical content of this case, please first refer to the attached drawings, in which:

[0018] FIG1 is a perspective schematic diagram of a mobile phone protective case provided by the present invention, viewed from the front;

[0019] FIG2 is a perspective schematic diagram of the back side of the mobile phone protective case shown in FIG1 ;

[0020] FIG3 is a schematic plan view of the front direction of the mobile phone protective case shown in FIG1 ;

[0021] FIG4 is a schematic diagram of the AA cross-section of the mobile phone protective case shown in FIG3 ;

[0022] FIG5 is a partial enlarged view of FIG4;

[0023] FIG6 is a schematic plan view of the side direction of the mobile phone protective case shown in FIG1 ;

[0024] FIG7 is a schematic cross-sectional view of the mobile phone protective case shown in FIG6 ;

[0025] Figure 8 is a partial enlarged view of Figure 7;

[0026] FIG9 is a flow chart of a method for preparing a sheet body provided by the present invention. Modes for Carrying Out the Invention

[0027] The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings of the present invention.

[0028] The sheet material provided in one embodiment of the present invention is used for a mobile phone protective case. It is understandable that the use of the sheet material provided by the present invention is not limited to mobile phone protective cases.

[0029] Referring to Figures 1 and 2 , the mobile phone protective case 100 includes a back panel 10 and side panels 17 bent from the edges of the back panel 10. The back panel 10 is used to rest against the back of a mobile phone (not shown), and the side panels 17 are used to clamp the sides of the mobile phone, thereby attaching the mobile phone to the mobile phone protective case 100. Preferably, the back panel 10 and the side panels 17 are a one-piece, integral structure. It is understood that the back panel 10 can be provided with a through hole 13 to clear the mobile phone's camera, and an outward flange 14 can be provided on the outside of the through hole 13 to protect the exposed camera of the mobile phone. The side panel 17 can also be provided with a through hole 19 to clear the physical buttons of the mobile phone. It is understood that the through hole 19 can also be in the form of a through hole.

[0030] The thickness of the back panel 10 does not exceed 2 mm, preferably not exceeding 1.5 mm, to provide a better grip. A sheet magnet 21 is fixedly mounted on the back panel 10 to facilitate attachment to external devices, such as wireless chargers. The thickness of the sheet magnet 21 is less than that of the back panel 10. A magnetic calibrator 23 is also fixedly mounted on the back panel 10 to enhance the magnetic attraction and positioning of the mobile phone protective case 100 with external objects, such as wireless chargers.

[0031] In this embodiment, the back plate 10 is fixed with multiple sheet magnets 21, which are arranged at intervals along the plane of the back plate 10. More specifically, the multiple sheet magnets 21 are arranged in a ring shape. The back plate 10 also includes a central portion 15 surrounded by the multiple sheet magnets 21.

[0032] The back plate 10 is made of a sheet material, which will be described in more detail below with reference to FIG. 3 to FIG. 8 .

[0033] Referring to Figures 3 to 5 , in this embodiment, the backplane 10 comprises a sheet body 11, an inner shell 118 abutting against the inner wall of the sheet body 11, and an outer shell 119 abutting against the outer wall of the sheet body 11. The sheet body 11, inner shell 118, and outer shell 119 form a one-piece, integral unit. The thickness of the sheet body 11 does not exceed 0.9 mm. The outer shell 119 can be made of plastic, metal, Kevlar, or other materials. The inner shell 118 is preferably made of polyester film (such as PC, PET, or TPU), polyethylene film (such as PE or PTFE), polypropylene film, or epoxy film.

[0034] The sheet body 11 is provided with a receiving cavity for receiving the sheet magnet 21. Before assembling the sheet magnet 21, the receiving cavity can be a through hole running through the thickness direction of the sheet body 11, or a blind groove recessed on the front or back of the sheet body 11. The thickness of the sheet magnet 21 is less than the thickness of the sheet body 11, for example, the difference in thickness is between 0.05 and 0.5 mm. It can be understood that the receiving cavity in the form of a through hole or a blind groove has a cavity wall. The sheet body 11 has a first filling part 113 that enters the gap between the sheet magnet 21 and the cavity wall of the receiving cavity, a second filling part 114 that covers the front of the sheet magnet 21, and a third filling part 115 that covers the back of the sheet magnet 21. The sheet magnet 21 is surrounded by the corresponding first filling part 113, second filling part 114 and third filling part 115, and together fills the receiving cavity. The first filling portion 113 connects the second filling portion 114 and the third filling portion 115, and is connected to the portion of the sheet body 11 located outside the receiving cavity to form a one-piece integral body. It is also connected to the central portion 15 of the sheet body 11 located inside the receiving cavity to form a one-piece integral body, thereby embedding the sheet magnet 21 therein. This solution not only improves the firmness and reliability of the magnet 21 embedded in the sheet body 11, but also eliminates the negative effects caused by uneven thickness of the sheet magnet 21 itself and between the sheet magnet 21 and the sheet body 11, thereby improving the thickness uniformity of the sheet body 11. Preferably, the front and back of the sheet magnet 21 are completely covered by the second filling portion 114 and the third filling portion 115, respectively, so that the sheet body 11 has a uniform thickness and the front and back of the sheet body 11 remain flat, preventing the sheet magnet from leaving ridges or dents on the local surface of the back plate 10 of the mobile phone protective case 100.

[0035] In this embodiment, before the sheet magnet 21 is assembled, the receiving cavity of the sheet body 11 is in the form of a through-hole. The sheet body 11 includes a hot-melt matrix and reinforcing fibers contained within the hot-melt matrix. For example, the reinforcing fibers may be glass fibers or aramid fibers, and the hot-melt matrix may be an epoxy resin. After the sheet magnet 21 is assembled into the receiving cavity of the sheet body 11, the sheet body 11 is heated and pressurized. As shown in FIG5 , a portion of the material of the sheet body 11 (primarily the molten hot-melt matrix) flows into the gap between the sheet magnet 21 and the cavity wall, forming a first filling portion 113. It is understood that the first filling portion 113 is connected to the portion of the sheet body 11 located outside the cavity, forming a one-piece, integral structure. At or after forming the first filling portion 113, a portion of the material of the sheet magnet 21 (primarily the molten hot-melt matrix) spreads along the surface of the sheet magnet 21 to form a second filling portion 114 and a third filling portion 115, respectively. In this way, the second filling portion 114 and the third filling portion 115 are connected to the sheet body 11 on both sides of the receiving cavity through the first filling portion 113 to form a one-piece whole.

[0036] In this embodiment, the sheet body 11 is formed by curing a fiberglass woven fabric impregnated with a hot-melt matrix, such as resin, and then solidified. After curing, the sheet body 11 becomes a single, indivisible piece. The resin encapsulates the fiberglass woven fabric. Figure 5 schematically illustrates the sheet body 11 as three layers 110 to 112 to illustrate microscopic details. The middle layer 110 is the fiberglass woven fabric, and the inner and outer sealing layers 111 and 112 are cured resins, such as epoxy resin, PC resin, TPU resin, TPE resin, or other suitable thermoplastic or thermosetting resins. It should be noted that the physical layering and dimensional ratios of the sheet body 11 of the present invention are not limited to those shown in Figure 5. For example, the sheet body 11 formed by impregnating the fiberglass woven fabric with a hot-melt matrix, such as resin, may lack distinct layer boundaries, or the physical dimensions of the layers may differ or be incomplete from those shown in Figure 5. It can be understood that the first filling portion 113 , the second filling portion 114 and the third filling portion 115 are mainly made of resin, so that they can be connected to the sheet body 11 on both sides of the receiving cavity into a one-piece whole.

[0037] Preferably, the inner shell 118 covers the position corresponding to the sheet magnet 21, strengthening the connection between the sheet magnet 21 and the sheet body 11. It is understood that the inner shell 118 can be in the form of a thin film, with a thickness less than the thickness of the sheet body 11. Similarly, the outer shell 119 covers at least the position corresponding to the sheet magnet 21, strengthening the connection between the sheet magnet 21 and the sheet body 11.

[0038] In an alternative embodiment, the inner shell 118 and / or the outer shell 119 may be omitted according to actual needs.

[0039] Referring to Figures 6-8 , the sheet body 11 includes a fourth filling portion 116 that extends into the gap between two adjacent sheet magnets 21. This fourth filling portion 116 is connected to the first filling portion 113, the second filling portion 114, and the third filling portion 115 to form a single-piece structure. This ensures that each sheet magnet 21 is fully enclosed and positioned on all sides, front, and back.

[0040] The thickness of the sheet magnet 21 is between 0.25 and 0.4 mm, preferably 0.3 mm. The sheet body 11 is 0.05 to 0.5 mm thicker than the sheet magnet 21, preferably 0.15 to 0.35 mm thicker; or 10% to 40% thicker than the sheet magnet 21, more preferably 15% to 35% thicker. The housing 119 is made of pre-impregnated aramid fiber and is 0.1 to 0.4 mm thick, preferably 0.25 to 0.35 mm thick, or 50% to 150% of the thickness of the sheet body 11. The inner shell 118 is in the form of a coating, and its material is polyester film (PC, PET, TPU, etc.), polyethylene film (PE, PTFE, etc.), polypropylene film, epoxy film, etc., and is covered on the inner surface of the sheet body 11 through a coating process or a hot pressing process. The thickness is 0.02-0.28 mm, more preferably 0.05~0.15 mm, or the thickness is 10%~35% of the thickness of the sheet body 11, more preferably 15%~30% of the thickness of the sheet body 11.

[0041] FIG9 is a flow chart of a method for preparing a sheet body provided by the present invention. As shown in FIG9 , in step S101, a hot melt matrix is ​​used to impregnate a reinforced fiber sheet to obtain a first sheet. Then, in step S103, a receiving cavity for accommodating a sheet magnet is provided in the first sheet. The receiving cavity can be a through hole extending through the thickness direction of the first sheet, or a blind groove recessed from the front or back of the first sheet. Then, in step S105, the sheet magnet is assembled into the receiving cavity, and the thickness of the sheet magnet is less than the thickness of the first sheet. Then, in step S107, the first sheet and the sheet magnet assembled therein are placed as a whole between two release films, and are hot-pressed and solidified in a vacuum autoclave, so that the molten hot melt matrix flows into the space between the sheet magnet and the cavity wall of the receiving cavity to form a first filling portion, flows to the surface of the sheet magnet to form a second filling portion and / or a third filling portion, flows into the gap between the sheet magnets to obtain a fourth filling portion, etc., thereby obtaining a sheet body. Then, in step S109, an outer shell and / or inner shell is added to the sheet body as needed. Preferably, the inner shell is covered on the inner surface of the sheet body by a coating process or a hot pressing process, and has a thickness of 0.05~0.15 mm or 10%~35% of the thickness of the sheet body. More preferably, the thickness of the inner shell is 15%~30% of the sheet body.

[0042] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A sheet material, comprising a sheet material body (11), wherein the thickness of the sheet material body (11) does not exceed 0.9 mm; characterized in that: The sheet body (11) comprises a hot-melt matrix and reinforcing fibers contained in the hot-melt matrix; the sheet body (11) is provided with a receiving cavity and a sheet magnet (21) received in the receiving cavity, the thickness of the sheet magnet (21) being less than the thickness of the sheet body (11); the sheet body (11) comprises a first filling portion (113) entering between the sheet magnet (21) and the cavity wall of the receiving cavity, a second filling portion (114) covering the front side of the sheet magnet (21), and a third filling portion (115) covering the back side of the sheet magnet (21); the first filling portion (113) is connected to the second filling portion (114) and the third filling portion (115), and is connected to a portion of the sheet body (11) located outside the receiving cavity to form a one-piece whole, so that the sheet magnet (21) is embedded therein.

2. The sheet material according to claim 1, characterized in that The front side and the back side of the sheet-shaped magnet (21) are completely covered by the second filling part (114) and the third filling part (115) respectively, so that the sheet body (11) has a uniform thickness.

3. The sheet material according to claim 1, characterized in that The first filling portion (113) is formed by the hot-melt matrix of the sheet body (11) entering between the sheet magnet (21) and the wall of the receiving cavity, and the first filling portion (113) is connected to the portion of the sheet body (11) located outside the receiving cavity to form a one-piece whole; the second filling portion (114) and the third filling portion (115) are formed by the hot-melt matrix of the sheet body (11) spreading along the surface of the sheet magnet (21) when or after the first filling portion (113) is formed.

4. The sheet material according to claim 1, characterized in that The receiving cavity contains a plurality of sheet-like magnets (21), which are arranged at intervals along the plane direction of the sheet body (11); the sheet body (11) has a fourth filling portion (116) that enters the gap between two adjacent sheet-like magnets (21); the fourth filling portion (116) is connected to the first filling portion (113), the second filling portion (114), and the third filling portion (115) to form a one-piece whole.

5. The sheet material according to claim 4, characterized in that The plurality of sheet-shaped magnets (21) are arranged in a ring shape; the sheet body (11) further comprises a central portion (15) surrounded by the plurality of sheet-shaped magnets (21); the central portion (15) is connected to the first filling portion (113), the second filling portion (114), the third filling portion (115), and the fourth filling portion (116) to form a one-piece whole.

6. The sheet material according to claim 1, wherein The thickness of the sheet-shaped magnet (21) is 0.05-0.5 mm smaller than the thickness of the sheet body (11).

7. The sheet material according to claim 1, wherein Also includes: an inner shell (118) covering the inner surface of the sheet body (11) and connected to the sheet body (11) to form a one-piece integral body, the inner shell (118) covering a position corresponding to the sheet magnet (21) to strengthen the connection between the sheet magnet (21) and the sheet body (11), the inner shell covering the inner surface of the sheet body by a coating process or a hot pressing process, and having a thickness of 0.05 to 0.15 mm or 10% to 35% of the thickness of the sheet body; and / or A shell (119) covers the outer surface of the sheet body (11) and is connected to the sheet body (11) to form a one-piece integral body, wherein the shell (119) covers a position corresponding to the sheet magnet (21) to strengthen the connection between the sheet magnet (21) and the sheet body (11).

8. An electronic product protective shell, characterized in that: At least a portion of the electronic product protective case comprises the sheet material according to claim 1 .

9. A method for manufacturing a sheet material, characterized in that: include: Step S101, using a hot melt matrix to impregnate the reinforcing fiber sheet to obtain a first sheet; Step S103, providing a receiving cavity for receiving the sheet magnet in the first sheet, wherein the receiving cavity is a through hole penetrating the first sheet in the thickness direction or a blind groove not penetrating the first sheet in the thickness direction; Step S105, assembling a sheet magnet into the receiving cavity, wherein the thickness of the sheet magnet is smaller than the thickness of the first sheet material; Step S107, placing the first sheet material and the sheet magnet assembled thereon as a whole between two release films, and performing heat pressing and curing in a vacuum autoclave, so that the hot melt matrix of the first sheet material flows into the space between the sheet magnet and the wall of the receiving cavity in a molten state to form a first filling portion, and flows to the two surfaces of the sheet magnet to form a second filling portion and a third filling portion, so that the sheet magnet is embedded therein, and a sheet body with a thickness not exceeding 0.9 mm is obtained.

10. The method according to claim 9, characterized in that Also includes: Step S109, adding an outer shell and / or an inner shell to the sheet body to form a one-piece sheet; The inner shell is covered on the inner surface of the sheet body by a coating process or a hot pressing process, and has a thickness of 0.05-0.15 mm or 10%-35% of the thickness of the sheet body.

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