Back glue structure and front shell assembly

Abstract

The utility model belongs to the field of electronic equipment accessories, and discloses a back adhesive structure and a front shell assembly, the back adhesive structure comprises a release layer and a back adhesive layer, the release layer comprises a first release film and a second release film which are connected with each other and located on the same layer, the second release film is arranged around the first release film, and the back adhesive layer is arranged on the back adhesive layer. A tearing line is arranged between the first release film and the second release film along the appearance of the first release film; the back adhesive layer is adhered to the second release film. According to the utility model, the first release film and the second release film are arranged on the release layer, and the first release film and the second release film are connected through the tearing line, so that when the NFC antenna is installed, the first release film and the second release film are torn off, the back adhesive layer is still protected, and the viscosity of the back adhesive layer is not influenced; therefore, the situation that the screen module and the back glue are not firmly attached due to the fact that the back glue layer is polluted is avoided, the bonding strength of the screen module and the front shell is improved, it can be avoided that water vapor enters and influences the function of the screen module, and the problem that the screen module warps or falls off can be solved.

Description

Technical Field

[0001] This utility model relates to the field of electronic device accessories technology, and in particular to an adhesive backing structure and a front shell assembly. Background Technology

[0002] NFC (Near Field Communication) is a short-range wireless communication technology that enables data exchange between devices. It allows two NFC-enabled devices to quickly connect and interact when they are close to each other, usually within a few centimeters, and features convenience, speed, and security.

[0003] The under-display NFC antenna needs to be mounted on the front shell beneath the display, which is then secured to the shell with adhesive. The adhesive and front shell are typically bonded at the molding factory. To prevent contamination during bonding and transportation, which could affect adhesion, a protective film (release layer) is applied to the adhesive at the factory. However, the NFC antenna is usually assembled at the assembly plant, as they have equipment for testing antenna performance. During assembly, the protective film on the adhesive is removed before the NFC antenna is bonded. Without protection during bonding, the adhesive is easily touched by workers, affecting its adhesion and causing a loose bond between the display and the antenna. After reliability testing or after a period of customer use, this can lead to moisture entering the device and affecting display functionality, as well as the display potentially lifting or detaching. Utility Model Content

[0004] The purpose of this application is to provide an adhesive backing structure and front shell assembly that not only facilitates the installation of the NFC antenna, but also does not affect the bonding strength between the screen module and the front shell.

[0005] The technical solution provided in this application is as follows:

[0006] On the one hand, an adhesive backing structure is provided, comprising:

[0007] A release layer, the release layer comprising a first release film and a second release film that are interconnected and located in the same layer, the second release film being disposed around the first release film, and a tear line being provided between the first release film and the second release film along the outer shape of the first release film;

[0008] An adhesive backing layer is adhered to the second release film.

[0009] In some embodiments, the adhesive backing layer has a frame-shaped structure and is disposed around the first release film.

[0010] In some embodiments, the shape and size of the first release film are the same as those of the NFC antenna.

[0011] In some implementations, the projection of the NFC antenna onto the first release film is located within the area of ​​the first release film.

[0012] In some embodiments, the first release film has a first opening, which forms a tear-off portion of the first release film.

[0013] In some embodiments, a second opening is provided on the second release film in a region outside the adhesive layer, the second opening forming a tear-off portion of the second release film.

[0014] On the other hand, a front shell assembly is also provided, including a front shell and an adhesive backing structure as described in any of the above embodiments, wherein the side of the adhesive backing layer away from the release layer is adhered to the front shell.

[0015] In some embodiments, the front cover has an NFC antenna mounting area, and the first release film is positioned opposite the NFC antenna mounting area.

[0016] In some embodiments, the front shell includes a side panel, and the adhesive backing is adhered to the front side of the side panel.

[0017] In some embodiments, the inner sidewall of the side plate is provided with a first recess.

[0018] The technical advantages of this application are as follows: a first release film and a second release film are provided on the release layer, and the first release film and the second release film are connected by a tear line. When installing the NFC antenna, the first release film is torn off, and the second release film still protects the adhesive layer and does not affect the adhesiveness of the adhesive layer. This avoids the screen module and the adhesive layer from being poorly bonded due to contamination of the adhesive layer, and improves the bonding strength between the screen module and the front shell. This not only prevents moisture from entering and affecting the function of the screen module, but also prevents the screen module from lifting or falling off. Attached Figure Description

[0019] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0020] Figure 1 This is an exploded view of the front shell assembly and screen module provided in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the release layer structure provided in an embodiment of this application;

[0022] Figure 3 This is an exploded view of the release layer provided in an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the front shell structure provided in an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of the structure of the front shell with an adhesive layer and an NFC antenna provided in the embodiments of this application.

[0025] Explanation of icon numbers:

[0026] 100. Release layer; 110. First release film; 111. First opening; 120. Second release film; 121. Second opening; 130. Tear line;

[0027] 200, Adhesive backing layer; 300, Front shell; 310, Bottom plate; 320, Side plate; 321, First recessed part; 400, NFC antenna; 500, Screen module. Detailed Implementation

[0028] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application can also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0030] To keep the drawings concise, each drawing only schematically shows the parts relevant to this application, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0031] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0032] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; or they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) are relative rather than absolute when describing the structure and movement of the various components, and are not intended to limit the direction of the product during actual use.

[0034] Furthermore, in the description of this application, ordinal numbers, such as "first" and "second," are used only to distinguish related objects and should not be construed as indicating or implying the relative importance or order between related objects.

[0035] like Figures 1 to 3 As shown, in one or more embodiments, this disclosure provides an adhesive backing structure, which includes a release layer 100 and an adhesive backing layer 200. The release layer 100 includes a first release film 110 and a second release film 120 that are interconnected and located in the same layer. The second release film 120 is disposed around the first release film 110. A tear line 130 is provided between the first release film 110 and the second release film 120 along the outer shape of the first release film 110. The adhesive backing layer 200 is adhered to the second release film 120.

[0036] The adhesive backing structure in at least one embodiment of this application is applied in the assembly process of electronic devices such as mobile phones, tablets, e-readers, wearable devices, POS machines, and laptops. The front shell 300 of the electronic device is produced in a mold factory, and the installation of the NFC antenna 400 and the assembly of the front shell 300 and the screen module 500 are completed in an assembly plant. When the front shell 300 leaves the mold factory, the adhesive backing structure of this embodiment is attached. The adhesive backing structure covers the entire front of the front shell. The release layer 100 of the adhesive backing structure protects the adhesive layer 200 and facilitates the attachment of the adhesive backing structure to the front shell 300. The adhesive layer 200 is used to fix the screen module 500 to the front shell 300.

[0037] The adhesive backing structure of this embodiment includes a release layer 100 and an adhesive backing layer 200. The release layer 100 is a full-surface release film or release paper. Placing the full-surface release film or release paper on the adhesive backing layer 200 not only protects the adhesive backing layer 200 from contamination and affecting its adhesiveness, but also increases the rigidity of the entire adhesive backing structure, making it easier to pick up and hold. This facilitates the attachment of the adhesive backing structure to the front shell 300, improving production efficiency and attachment accuracy, and reducing attachment difficulty.

[0038] Release layer 100 includes a first release film 110 and a second release film 120. The first release film 110 and the second release film 120 are located on the same layer and together form a single release layer. In this embodiment, the thickness of the first release film 110 and the second release film 120 is not limited; the thicknesses of the first release film 110 and the second release film 120 may be the same or different. A tear line 130 is provided between the first release film 110 and the second release film 120. The design of the tear line 130 refers to the pre-setting of some specific cutting lines or semi-cutting lines on the release layer 100, so that the release film on the tear line 130 is easier to tear, but these lines do not completely sever the release film, thereby ensuring that the two release films remain connected when they do not need to be torn apart. That is, when the first release film 110 is not torn, the first release film 110 and the second release film 120 in this embodiment are connected together by the tear line 130, and the first release film 110 and the second release film 120 are relatively easy to separate. When the first release film 110 is torn, the second release film 120 will not be torn as well, and the second release film 120 can continue to protect the adhesive layer 200.

[0039] The second release film 120 is disposed around the first release film 110. The adhesive layer 200 is adhered to the second release film 120. The first release film 110 does not have an adhesive layer. After the first release film 110 is torn off, an opening is formed on the release layer 100 in the area of ​​the first release film 110. This opening facilitates the installation of the NFC antenna 400 onto the front cover 300. Because a tear line 130 is provided between the first release film 110 and the second release film 120, tearing the first release film 110 will not tear the second release film 120, allowing the second release film 120 to still protect the adhesive layer 200. After peeling off the first release film 110, the area on the front shell 300 corresponding to the first release film 110 is exposed. An NFC antenna 400 can be installed in this exposed area. The NFC antenna 400 can be attached to the front shell 300 using its own adhesive or an additional adhesive. At this time, the second release film 120 still completely protects the adhesive layer 200, preventing it from being contaminated. After attaching the NFC antenna 400, when attaching the screen module 500, the second release film 120 is peeled off again to avoid poor adhesion between the screen module 500 and the adhesive layer due to contamination of the adhesive layer 200. This improves the bonding strength between the screen module 500 and the front shell 300, preventing moisture from entering and affecting the functionality of the screen module 500, and also preventing the screen module 500 from lifting or falling off.

[0040] In some embodiments, such as Figure 1 As shown, the adhesive backing layer 200 has a frame-shaped structure and is disposed around the first release film 110. In this embodiment, the adhesive backing layer 200 has a closed frame-shaped structure, which allows the entire circumference of the front shell 300 to be covered with adhesive, thereby improving the bonding strength between the screen module 500 and the front shell 300. This not only prevents the screen module 500 from lifting and enhances the structural stability and durability of the screen module 500, but also provides better dustproof and moisture-proof protection.

[0041] In some embodiments, the shape and size of the first release film 110 are the same as those of the NFC antenna 400. After the adhesive structure is installed on the front shell 300, the projection of the first release film 110 on the front shell 300 coincides with the NFC antenna mounting area on the front shell 300. After the first release film 110 is torn off, the NFC antenna mounting area on the front shell 300 is exposed. The shape and size of the NFC antenna 400 are the same as those of the first release film 110. The NFC antenna 400 can be passed through the cutout area after the first release film 110 is torn off and installed on the NFC antenna mounting area on the front shell 300. This not only enables the installation of the NFC antenna 400, but also prevents the release film on the adhesive layer 200 from being contaminated due to being torn off.

[0042] In some other embodiments, the projection of the NFC antenna 400 onto the first release film 110 is located within the area of ​​the first release film 110, meaning the size of the first release film 110 is larger than the size of the NFC antenna 400. After the first release film 110 is torn off, the NFC antenna 400 can be easily installed from the cut-out area after the first release film 110 is torn off, further improving the ease of installation of the NFC antenna 400. In this embodiment, the shape and specific size of the first release film 110 are not limited. The shape of the first release film 110 can be the same as or different from the NFC antenna 400, as long as it enables convenient installation of the NFC antenna 400. Furthermore, the first release film 110 can be any shape, such as circular, rectangular, elliptical, or other regular or irregular shapes. The size of the first release film 110 can be set according to the size of the NFC antenna 400 and the size of the adhesive layer 200. It is necessary to ensure that the size of the first release film 110 is larger than the size of the NFC antenna 400 so as to facilitate the installation of the NFC antenna 400. At the same time, the size of the first release film 110 cannot be larger than the inner frame size of the adhesive layer 200 to avoid the adhesive layer 200 being exposed and contaminated after the first release film 110 is torn off, which would affect the adhesion of the adhesive layer 200.

[0043] In some embodiments, such as Figure 2 and Figure 3 As shown, the first release film 110 has a first opening 111, which forms a tear-handling part of the first release film 110. The first opening 111 extends through the first release film 110 along its thickness direction. By providing the first opening 111 to form the tear-handling part, the operator can easily tear off the first release film 110, improving operational efficiency. Furthermore, the first opening 111 extends to the edge of the first release film 110, that is, it extends to the tear line 130 between the first release film 110 and the second release film 120, making it easier to tear the first release film 110 along the tear line 130, further improving operational efficiency.

[0044] In some embodiments, such as Figure 2 and Figure 3 As shown, a second opening 121 is provided on the second release film 120 in a region outside the adhesive layer 200, forming a tear-away portion of the second release film 120. The second opening 121 on the second release film 120 forms a tear-away portion, facilitating the tearing of the second release film 120. The second opening 121, located outside the adhesive layer 200, prevents the adhesive layer 200 from being exposed and contaminated.

[0045] like Figure 1As shown, in one or more embodiments, this application also provides a front shell assembly, including a front shell 300 and an adhesive backing structure as described in any of the above embodiments, wherein the side of the adhesive backing layer 200 away from the release layer 100 is adhered to the front shell. The adhesive backing layer 200 enables the front shell 300 to be bonded to the screen module 500.

[0046] The front shell assembly of this embodiment can be applied to electronic devices such as mobile phones, tablets, e-readers, wearable devices, POS machines, and laptops. The front shell assembly includes a front shell 300 and an adhesive backing structure when shipped from the mold factory; the adhesive backing structure is attached to the front shell 300. During the assembly of the NFC antenna 400 and the screen module 500 at the assembly plant, the first release film 110 is first removed from the tear line 130, and the NFC antenna 400 is installed onto the front shell 300 through the cutout area created by the first release film 110. The remaining second release film 120 completely protects the adhesive backing layer 200, preventing it from being contaminated. After attaching the NFC antenna 400, the second release film 120 is removed again when attaching the screen module 500, and the screen module 500 is then adhered to the front shell 300 through the adhesive backing layer 200.

[0047] In some embodiments, the front cover 300 has an NFC antenna mounting area, and a first release film 110 faces the NFC antenna mounting area. The first release film 110, when facing the NFC antenna mounting area on the front cover 300, facilitates the installation of the NFC antenna 400 after being removed, thus improving installation efficiency. Furthermore, positioning posts may be provided on the front cover 300 to position the NFC antenna 400, thereby improving the installation accuracy of the NFC antenna 400.

[0048] In some embodiments, such as Figure 4 and Figure 5 As shown, the front shell 300 includes a base plate 310 and a side plate 320. The side plate 320 surrounds the base plate 310, and an adhesive layer 200 is adhered to the front side of the side plate 320 to adhere the screen module 500 to the front side of the front shell 300. The inner sidewall of the side plate 320 is provided with a first recess 321 for mounting the edge area of ​​the NFC antenna 400. The edge area of ​​the NFC antenna 400 is adhered to the first recess 321 of the side plate 320 by adhesive, and the middle area of ​​the NFC antenna 400 is adhered to the base plate 310 of the front shell 300. A positioning post for positioning the NFC antenna 400 is provided on the base plate 310 of the front shell 300 to facilitate the positioning and installation of the NFC antenna 400.

[0049] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0050] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. An adhesive backing structure, characterized in that, include: A release layer, the release layer comprising a first release film and a second release film that are interconnected and located in the same layer, the second release film being disposed around the first release film, and a tear line being provided between the first release film and the second release film along the outer shape of the first release film; An adhesive backing layer is adhered to the second release film.

2. The adhesive backing structure according to claim 1, characterized in that, The adhesive backing layer has a frame-shaped structure and is arranged around the first release film.

3. The adhesive backing structure according to claim 1, characterized in that, The shape and size of the first release film are the same as those of the NFC antenna.

4. The adhesive backing structure according to claim 1, characterized in that, The projection of the NFC antenna onto the first release film is located within the area of ​​the first release film.

5. The adhesive backing structure according to any one of claims 1-4, characterized in that, The first release film has a first opening, which forms the tear-off portion of the first release film.

6. The adhesive backing structure according to any one of claims 1-4, characterized in that, The second release film has a second opening in the area outside the adhesive layer, and the second opening forms the tear-off part of the second release film.

7. A front shell assembly, characterized in that, It includes a front shell and an adhesive backing structure as described in any one of claims 1-6, wherein the side of the adhesive backing layer away from the release layer is adhered to the front shell.

8. A front shell assembly according to claim 7, characterized in that, The front cover has an NFC antenna mounting area, and the first release film is positioned opposite the NFC antenna mounting area.

9. A front shell assembly according to claim 7, characterized in that, The front shell includes a side panel, and the adhesive backing layer is adhered to the front side of the side panel.

10. A front shell assembly according to claim 9, characterized in that, The inner wall of the side plate is provided with a first recess.

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