NFC module and vehicle-mounted rearview mirror

Abstract

The utility model relates to electronic technical field discloses a kind of NFC module and vehicle-mounted rearview mirror, NFC module includes: matched upper cover and lower shell, the side wall of upper cover is equipped with mounting portion, the lower surface of upper cover is equipped with weld, the upper end surface of lower shell is equipped with weld boss for laser welding cooperation, weld boss is embedded in weld, and weld boss is sealed by laser welding with weld;The width of weld is set as 1.0mm-1.4mm, and the penetration of weld is set as 0.4mm-0.6mm.The NFC module provided by the utility model sets up mounting portion in upper cover side wall, sets up lower shell as general structure, so that the NFC module can be commonly used in multiple vehicle types, reduces mold investment;Upper cover and lower shell are connected by laser welding sealing, and the optimized weld parameter ensures the welding strength of upper cover and lower shell, significantly improves the stress resistance of welding surface, ensures that weld does not break when upper cover bears installation external force, avoids the sealing failure caused by stress concentration, satisfies IP6K7 waterproof level.

Description

Technical Field

[0001] This utility model belongs to the field of electronic technology, specifically relating to an NFC module and a vehicle rearview mirror. Background Technology

[0002] The vehicle digital key system enables keyless entry and start via smartphones, smartwatches, etc. The core component, the NFC module, is integrated into the vehicle's left rearview mirror and must meet the IP6K7 waterproof rating to cope with complex environments.

[0003] To meet the IP6K7 waterproof rating, existing vehicle digital key systems generally use laser welding technology to achieve a sealed connection between the upper and lower plastic shells for their NFC modules.

[0004] The existing NFC module uses laser welding technology to melt the contact surface of the plastic upper and lower shells with laser thermal energy. After cooling, a seamless seal is formed, eliminating the problem of colloid aging and resulting in better durability. The width of the weld surface can be controlled, with a weld width and penetration depth of 0.8mm and 0.3mm respectively, and a weld strength of over 25MPa. It supports thin-walled designs down to 1.2mm, meeting the requirements for lightweighting.

[0005] However, existing NFC modules concentrate the vehicle mounting structure in the lower shell. While this can distribute mechanical stress and prevent weld surface stress from causing seal failure, the lower shell requires customized design, resulting in high mold complexity and increased development costs. The non-standard design of the lower shell leads to poor versatility, inability to adapt to multiple vehicle models, and low reuse rate, indirectly increasing unit cost and project verification cycle.

[0006] If the vehicle mounting structure is directly transferred to the upper shell, the weld width and penetration depth of the existing NFC module's laser welding cannot withstand the external force during installation, which can easily lead to stress concentration on the weld surface and seal failure, failing to meet the IP6K7 waterproof and mechanical reliability requirements. Utility Model Content

[0007] To address the issue that the laser welding parameters in the existing laser welding process cannot meet the requirements for welding strength, sealing, and assembly compatibility after the installation structure is transferred from the lower shell to the upper shell, this utility model provides an NFC module and a vehicle rearview mirror.

[0008] The technical effects to be achieved by this utility model are realized through the following technical aspects:

[0009] In a first aspect, this utility model provides an NFC module, comprising: a matching upper cover and a lower housing, wherein the side wall of the upper cover is provided with a mounting portion, the lower surface of the upper cover is provided with a weld, and the upper end face of the lower housing is provided with a welding boss for laser welding engagement, the welding boss being embedded in the weld, and the welding boss and the weld being sealed by laser welding; the width of the weld is set to 1.0mm-1.4mm, and the weld penetration depth is set to 0.4mm-0.6mm.

[0010] In some alternative implementations, the weld is provided around the lower surface of the upper cover, and the welding boss is provided around the upper end face of the lower housing.

[0011] In some alternative implementations, the mounting parts are configured as a group, with the group of mounting parts positioned on opposite sidewalls of the upper cover.

[0012] In some optional implementations, a PCBA motherboard and an antenna board are also included, wherein the PCBA motherboard is fixedly installed in the accommodating cavity of the lower housing, and the antenna board is fixedly installed on the lower surface of the upper cover, and the PCBA motherboard and the antenna board are connected by a pin communication connection.

[0013] In some alternative implementations, the pin is disposed in the lower housing and is fixed and communicatively connected to the PCBA motherboard; an interface communicating with the receiving cavity is provided at a position opposite to the pin in the lower housing, and the pin is connected to the connector through a connecting wire passing through the interface.

[0014] In some alternative implementations, a via is provided on the PCBA motherboard at the position opposite to the pin, the pin passes through the via and is interference-fitted with the via; the pin passing through the via is in contact with the antenna board.

[0015] In some alternative implementations, a support member and a first positioning post are provided in the accommodating cavity of the lower housing, and a first positioning hole is provided at the position opposite to the first positioning post on the PCBA main board. The support member abuts against the PCBA main board, and the first positioning post passes through the first positioning hole and is interference-fitted with the first positioning hole.

[0016] In some alternative implementations, the lower surface of the upper cover is provided with a locking member and a second positioning post, the antenna plate is provided with a second positioning hole at the position opposite to the second positioning post, the locking member abuts against the side wall of the antenna plate, and the second positioning post passes through the second positioning hole and is interference-fitted with the second positioning hole.

[0017] In some alternative implementations, the locking member is arranged around the lower surface of the upper cover, the locking member is located inside the weld, and the side wall of the antenna plate is provided with a limiting groove that matches the locking member, and the locking member is engaged in the limiting groove.

[0018] Secondly, this utility model provides a vehicle rearview mirror, including a mirror housing and an NFC module as described in any of the above claims. The NFC module is disposed inside the mirror housing and is fixedly connected to the mirror housing via the mounting portion disposed on the side wall of the upper cover.

[0019] In summary, this utility model has at least the following advantages:

[0020] The NFC module provided by this utility model has its mounting part located on the side wall of the upper cover, and the lower housing is designed as a universal structure, allowing the NFC module to be used in multiple vehicle models and reducing mold investment. The upper cover and lower housing are connected by laser welding with a sealed connection. The weld width is set to 1.0mm-1.4mm, and the weld penetration depth is set to 0.4mm-0.6mm. The optimized weld parameters significantly improve the stress resistance of the weld surface, ensuring that the weld does not crack when the upper cover bears the installation force. In addition, the optimized weld parameters ensure the welding strength of the upper cover and lower housing, while also dispersing the mechanical load during NFC module installation, avoiding stress concentration that could lead to seal failure, and meeting the IP6K7 waterproof rating.

[0021] The above description is merely an overview of the technical solutions of the present utility model embodiments. In order to better understand the technical means of the present invention embodiments and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present utility model embodiments more obvious and understandable, specific embodiments of the present utility model are described below. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an NFC module provided in an embodiment of the present invention.

[0023] Figure 2 A cross-sectional view of an NFC module provided for an embodiment of this utility model.

[0024] Figure 3 for Figure 2 Enlarged schematic of part B.

[0025] Figure 4 An exploded view of an NFC module provided in an embodiment of this utility model.

[0026] Figure 5 An exploded view of an NFC module provided as an embodiment of this utility model.

[0027] Marked in the image:

[0028] 10. Top cover;

[0029] 11. Mounting section; 12. Weld; 13. Locking component; 14. Second positioning post; 15. Limiting component;

[0030] 20. Lower shell;

[0031] 21. Welding boss; 22. Pin; 23. Interface; 24. Support component; 25. First positioning post;

[0032] 30. PCBA motherboard; 31. Via;

[0033] 40. Antenna board;

[0034] 41. Limiting groove; 42. Second positioning hole. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] Example 1:

[0038] In order to solve the problem that the laser welding parameters of the existing laser welding process cannot meet the requirements of welding strength, sealing performance and assembly compatibility after the installation structure is transferred from the lower shell to the upper shell, this utility model provides an NFC module.

[0039] Please see Figures 1-4 This embodiment provides an NFC module, including: a matching upper cover 10 and a lower housing 20. The side wall of the upper cover 10 is provided with a mounting part 11, and the lower surface of the upper cover 10 is provided with a weld 12. The upper end face of the lower housing 20 is provided with a welding boss 21 for laser welding. The welding boss 21 is embedded in the weld 12, and the welding boss 21 and the weld 12 are sealed by laser welding. The width of the weld 12 is set to 1.0mm-1.4mm, and the penetration depth of the weld 12 is set to 0.4mm-0.6mm.

[0040] In this embodiment, the mounting part 11 is a vehicle mounting structure, which is provided with screw holes and / or buckles, so that the NFC module can be fixedly connected to the vehicle body through the mounting part 11.

[0041] The mounting section 11 is configured as a set, and the set of mounting sections 11 is configured on the opposite sidewalls of the upper cover 10 to ensure the stability of the NFC module installation.

[0042] In this embodiment, the lower surface of the upper cover 10, that is, the surface of the upper cover 10 opposite to the lower housing 20, is provided with a welding surface. The welding boss 21 is provided on the upper end surface of the lower housing 20, that is, the welding boss 21 is provided on the end surface of the lower housing 20 opposite to the upper cover 10. The welding boss 21 and the welding surface are laser welded together.

[0043] Therefore, in this embodiment, the upper cover 10 and the lower housing 20 of the NFC module are connected by laser welding process. The welding boss 21 and the welding surface are heated to fuse the plastic welding surface. After cooling, the melted plastic solidifies to form a seamless and sealed weld 12, and the welding boss 21 is embedded in the weld 12 and sealed to the weld 12.

[0044] And in this embodiment, such as Figure 3 As shown, the parameters of weld 12 are: the width a of weld 12 is set to 1.0mm-1.4mm, and the penetration depth b of weld 12 is set to 0.4mm-0.6mm.

[0045] The NFC module provided in this embodiment has its mounting part 11 located on the side wall of the upper cover 10, and the lower housing 20 configured as a universal structure, allowing the NFC module to be used in multiple vehicle models and reducing mold investment. The upper cover 10 and the lower housing 20 are connected by laser welding, with the width 'a' of the weld 12 set to 1.0mm-1.4mm and the penetration depth 'b' of the weld 12 set to 0.4mm-0.6mm. This results in a tighter, seamless sealing structure between the weld surfaces of the upper cover 10 and the lower housing 20, which can pass the IP6K7 waterproof rating test and effectively resist the corrosion of the internal components of the NFC module by complex environments. Furthermore, the optimized weld 12 parameters significantly improve the stress resistance of the weld surface, ensuring that the upper cover 10 can stably bear the external force on the mounting part 11 and that the weld does not crack when bearing the installation force. This avoids stress concentration and seal failure on the weld surface due to installation stress, ensuring a weld strength of over 25MPa, meeting the requirements of mechanical DV testing. It also disperses the mechanical load during NFC module installation, preventing seal failure caused by stress concentration.

[0046] In this preferred embodiment, the width a of weld 12 is set to 1.1mm-1.3mm, and the penetration depth b of weld 12 is set to 0.45mm-0.55mm.

[0047] More preferably, the width a of weld 12 is set to 1.2 mm, and the penetration depth b of weld 12 is set to 0.5 mm.

[0048] In this embodiment, the NFC module significantly improves the stress resistance of the welded joint between the upper cover 10 and the lower housing 20 by widening the width a of weld 12 to 1.2 mm and deepening the penetration depth b of weld 12 to 0.5 mm. This allows the upper cover 10 to stably bear the external force on the mounting part 11, preventing stress concentration and seal failure on the weld surface due to installation stress, and ensuring a weld strength of over 25 MPa, meeting the requirements of mechanical DV testing. Furthermore, widening the width a of weld 12 to 1.2 mm and deepening the penetration depth b of weld 12 to 0.5 mm creates a tighter, seamless sealing structure between the upper cover 10 and the lower housing 20, enabling it to pass the IP6K7 waterproof rating test and effectively resist corrosion of the internal components of the NFC module by complex environments.

[0049] In this preferred embodiment, the weld 12 is arranged around the lower surface of the upper cover 10, and the welding boss 21 is arranged around the upper end face of the lower shell 20, so that a sealed accommodating cavity is formed between the welded upper cover 10 and the lower shell 20.

[0050] In this preferred embodiment, the NFC module further includes a PCBA motherboard 30 and an antenna board 40. The PCBA motherboard 30 is fixedly installed in the accommodating cavity of the lower housing 20, and the antenna board 40 is fixedly installed on the lower surface of the upper cover 10. The PCBA motherboard 30 and the antenna board 40 are connected for communication via pins 22.

[0051] Specifically, such as Figure 4-5 As shown: Pin 22 is disposed in the lower housing 20. Pin 22 is fixed and communicatively connected to PCBA motherboard 30. An interface 23 communicating with the receiving cavity is provided at the position opposite to Pin 22 in the lower housing 20. Pin 22 is connected to the connector through a connecting wire passing through the interface 23.

[0052] In this embodiment, the pin 22 and the lower housing 20 are connected by a die-casting process, thereby making the pin 22 and the lower housing 20 integrally formed.

[0053] In this embodiment, a via 31 is provided at the position opposite to the pin 22 on the PCBA motherboard 30. The pin 22 passes through the via 31 and is interference-fitted with the via 31. The pin 22 passing through the via 31 is in contact with the antenna board 40.

[0054] Preferably, a support member 24 and a first positioning post 25 are provided in the accommodating cavity of the lower housing 20. A first positioning hole 32 is provided at the position opposite to the first positioning post 25 on the PCBA main board 30. The support member 24 abuts against the PCBA main board 30, and the first positioning post 25 passes through the first positioning hole 32 and is interference-fitted with the first positioning hole 32.

[0055] The assembly process of PCBA motherboard 30 is as follows: PCBA motherboard 30 is placed on support 24, and the first positioning post 25 passes through the first positioning hole 32. Then, PCBA motherboard 30 is tightly fixed to the lower housing 20 through Pressfit process.

[0056] In this embodiment, the PCBA motherboard 30 and the lower housing 20 are fixed by mechanical pressing, which reduces assembly steps and improves production efficiency. Furthermore, the interference fit between the first positioning post 25 and the first positioning hole 32, as well as the pin 22 and the through hole 31, ensures the precise position of the PCBA motherboard 30 within the lower housing 20, preventing displacement due to vibration and impact during vehicle operation. This lays the foundation for the subsequent laser welding of the upper cover 10 and the lower housing 20, as well as the overall functional stability of the NFC module.

[0057] In this preferred embodiment, the lower surface of the upper cover 10 is provided with a locking member 13 and a second positioning post 14. The antenna plate 40 is provided with a second positioning hole 42 at the position opposite to the second positioning post 14. The locking member 13 abuts against the side wall of the antenna plate 40, and the second positioning post 14 passes through the second positioning hole 42 and is interference-fitted with the second positioning hole 42.

[0058] The antenna plate 40 assembly process is as follows: after the antenna plate 40 is positioned to the designated position by the locking piece 13 and the second positioning post 14, the antenna plate 40 is tightly fixed to the upper cover 10 by the hot melt process.

[0059] The antenna board 40 and the upper cover 10 are physically bonded together by hot-melting plastic to ensure the positional stability of the antenna board 40 within the upper cover 10. This simplifies the assembly process and allows it to be adapted to the overall structure of the upper cover 10. It provides a structural basis for the subsequent laser welding of the upper cover 10 and the lower housing 20, while also ensuring the signal transmission stability of the antenna board 40 during operation and preventing near-field communication functions from being affected by loose assembly.

[0060] In this embodiment, the antenna board 40 is an NFC coil PCB board.

[0061] Preferably, the locking member 13 is arranged around the lower surface of the upper cover 10, and the locking member 13 is located inside the weld 12. The side wall of the antenna plate 40 is provided with a limiting groove 41 that matches the locking member 13. The locking member 13 is inserted into the limiting groove 41. The locking member 13 and the limiting groove 41 cooperate to lock and limit the antenna plate 40.

[0062] In this embodiment, the locking member 13 is disposed at the first opposite end of the upper cover 10 to lock the first opposite sidewall of the antenna plate 40.

[0063] In some optional embodiments, a limiting member 15 may also be provided. The limiting member 15 is disposed at the second opposite end of the lower surface of the upper cover 10. The limiting member 15 can abut against the second opposite sidewall of the antenna plate 40 to limit the second opposite sidewall of the antenna plate 40.

[0064] The antenna board 40 is positioned by the locking component 13 and the limiting component 15 to ensure that the antenna board 40 can be accurately positioned to the designated position, thereby ensuring the assembly accuracy of the antenna board 40.

[0065] Example 2:

[0066] This embodiment provides a vehicle rearview mirror.

[0067] The vehicle rearview mirror provided in this embodiment includes a mirror housing and an NFC module as described in any of the above embodiments. The NFC module is disposed inside the mirror housing and is fixedly connected to the mirror housing through a mounting part 11 disposed on the side wall of the upper cover 10.

[0068] In this embodiment, the specific structure and assembly process of the NFC module are described in the above NFC module embodiment, and will not be repeated here.

[0069] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0070] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0071] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0072] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0073] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. An NFC module, characterized in that, include: The upper cover (10) and lower shell (20) are matched. The side wall of the upper cover (10) is provided with a mounting part (11). The lower surface of the upper cover (10) is provided with a weld (12). The upper end face of the lower shell (20) is provided with a welding boss (21) for laser welding. The welding boss (21) is embedded in the weld (12). The welding boss (21) and the weld (12) are sealed by laser welding. The width of the weld (12) is set to 1.0mm-1.4mm, and the penetration depth of the weld (12) is set to 0.4mm-0.6mm.

2. An NFC module according to claim 1, characterized in that, The weld (12) is arranged around the lower surface of the upper cover (10), and the welding boss (21) is arranged around the upper end face of the lower shell (20).

3. An NFC module according to claim 1, characterized in that, The mounting parts (11) are configured as a group, and the mounting parts (11) are configured on the opposite sidewalls of the upper cover (10).

4. An NFC module according to claim 1, characterized in that, Also includes: PCBA motherboard (30) and antenna board (40), wherein the PCBA motherboard (30) is fixedly installed in the accommodating cavity of the lower housing (20), and the antenna board (40) is fixedly installed on the lower surface of the upper cover (10). The PCBA motherboard (30) and the antenna board (40) are connected by a pin (22).

5. An NFC module according to claim 4, characterized in that, The pin (22) is disposed in the lower housing (20), and the pin (22) is fixed and communicatively connected to the PCBA motherboard (30); an interface (23) communicating with the accommodating cavity is provided at the position of the lower housing (20) relative to the pin (22), and the pin (22) is connected to the connector through a connecting wire passing through the interface (23).

6. An NFC module according to claim 5, characterized in that, The PCBA motherboard (30) has a via (31) at the position opposite to the pin (22), and the pin (22) passes through the via (31) and is press-fitted to the via (31); The pin (22) passing through the via (31) makes contact with the antenna plate (40).

7. An NFC module according to claim 4, characterized in that, A support member (24) and a first positioning post (25) are provided in the accommodating cavity of the lower housing (20). A first positioning hole (32) is provided at the position opposite to the first positioning post (25) of the PCBA main board (30). The support member (24) abuts against the PCBA main board (30). The first positioning post (25) passes through the first positioning hole (32) and is interference-fitted with the first positioning hole (32).

8. An NFC module according to claim 4, characterized in that, The lower surface of the upper cover (10) is provided with a locking member (13) and a second positioning post (14). The antenna plate (40) is provided with a second positioning hole (42) at the position opposite to the second positioning post (14). The locking member (13) abuts against the side wall of the antenna plate (40). The second positioning post (14) passes through the second positioning hole (42) and is interference-fitted with the second positioning hole (42).

9. An NFC module according to claim 8, characterized in that, The locking member (13) is arranged around the lower surface of the upper cover (10). The locking member (13) is located inside the weld (12). The side wall of the antenna plate (40) is provided with a limiting groove (41) that matches the locking member (13). The locking member (13) is inserted into the limiting groove (41).

10. A vehicle rearview mirror, characterized in that, The device includes a lens housing and an NFC module as described in any one of claims 1-9, wherein the NFC module is disposed inside the lens housing and is fixedly connected to the lens housing via the mounting portion (11) disposed on the side wall of the upper cover (10).

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