Coil component and coil module

Abstract

The coil assembly comprises a coil, a supporting ring and a circuit board, the coil is arranged on the supporting ring, an extension plate is arranged between the supporting ring and the circuit board, one end of the extension plate is connected with the supporting ring, and the other end of the extension plate is connected with the circuit board. The wire inlet end and the wire outlet end of the coil are arranged on the extension plate in an extending mode and electrically connected with the bonding pad on the circuit board, the length of the extension plate is at least 60% of the distance between the supporting ring and the circuit board, and the extension plate can provide enough supporting force for the wire inlet end and the wire outlet end. The wire inlet end and the wire outlet end are prevented from shaking in the installation process to cause bending deviation, so that the stability of connection between the coil and the circuit board is enhanced, and the production quality is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic devices, and particularly relates to a coil assembly and a coil module. Background Art

[0002] NFC (Near Field Communication) is a short-distance communication technology, which is often applied to life fields such as wireless charging, NFC tags, bus cards, and access cards. It uses the principle of electromagnetic induction and completes simple data communication through the process of electricity generating magnetism and magnetism regenerating electricity. In the coil module of NFC, it is necessary to electrically connect the coil to the circuit board. Based on cost, the electromagnetic induction coil is very thin, and its material is copper with relatively large elasticity. Therefore, when welding the coil to the circuit board, the end of the coil is extremely easy to bend, making it difficult for the end of the coil to align with the pad on the circuit board, or fall off from the circuit board after welding, resulting in low production efficiency and high welding defect rate. Content of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a coil assembly and a coil module, which can effectively improve the connection stability between the coil and the circuit board and improve the production quality.

[0004] In a first aspect, an embodiment of the utility model provides a coil assembly, which includes a coil, a support ring, and a circuit board. The coil is arranged on the support ring, and an extension plate is arranged between the support ring and the circuit board. One end of the extension plate is connected to the support ring. The incoming line end and the outgoing line end of the coil extend and are arranged on the extension plate and are electrically connected to the pads on the circuit board. The length of the extension plate is at least 60% of the distance between the support ring and the circuit board.

[0005] Further, a second groove is arranged on the extension plate. The side of the second groove close to the circuit board has an opening. The incoming line end and the outgoing line end of the coil extend and are arranged in the second groove, and the pads are located in the extending direction of the second groove.

[0006] Further, two second grooves are arranged on the extension plate. The incoming line end and the outgoing line end are respectively arranged in the two second grooves, and the two second grooves are arranged in parallel.

[0007] Further, a first groove is arranged on the outer side surface of the support ring, and the first groove communicates with the second groove.

[0008] Further, a glue groove is also arranged on the extension plate. The glue groove communicates with the two second grooves at the same time. A fixing glue is arranged in the glue groove. The fixing glue covers the surfaces of the incoming line end and the outgoing line end, and the incoming line end and the outgoing line end are fixed in the second groove through the fixing glue.

[0009] Further, the glue groove is arranged in a cross shape.

[0010] Further, tin layers are respectively arranged on the outer sides of the outgoing line end and the incoming line end, and the length of the tin layer is greater than the maximum distance between the extension plate and the circuit board.

[0011] Further, a ring-shaped connecting part is connected to the top end of the support ring. The outer diameter of the connecting part is equal to the outer diameter of the support ring, the inner diameter of the connecting part is smaller than the inner diameter of the support ring, and the top surface of the connecting part and the top surface of the extension plate are in the same plane.

[0012] Further, the support ring and the coil are fixedly connected through an adhesive layer.

[0013] In a second aspect, an embodiment of the present invention further provides a coil module, and the coil module includes the coil assembly as in the first aspect.

[0014] An embodiment of the present invention provides a coil assembly and a coil module. The coil assembly includes a coil, a support ring, and a circuit board. The coil is arranged on the support ring, an extension plate is arranged between the support ring and the circuit board, one end of the extension plate is connected to the support ring, the incoming line end and the outgoing line end of the coil extend and are arranged on the extension plate and are electrically connected to the pads on the circuit board, and the length of the extension plate is at least 60% of the distance between the support ring and the circuit board. The extension plate can provide sufficient supporting force for the incoming line end and the outgoing line end, avoid the incoming line end and the outgoing line end from shaking and bending and offsetting during the installation process, enhance the stability of the connection between the coil and the circuit board, and further improve the production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Through the following description of the embodiments of the present invention with reference to the drawings, the above and other objects, features, and advantages of the present invention will become clearer. In the drawings:

[0016] Figure 1 is a schematic diagram of the overall structure of the coil assembly according to an embodiment of the present invention Figure 1 ;

[0017] Figure 2 is a schematic diagram of the overall structure of the coil assembly according to an embodiment of the present invention Figure 2 ;

[0018] Figure 3 is a schematic diagram of the specific structure of the extension plate according to an embodiment of the present invention Figure 1 ;

[0019] Figure 4 is a schematic diagram of the specific structure of the extension plate according to an embodiment of the present invention Figure 2 ;

[0020] Figure 5 is a schematic diagram of the structure of the extension plate provided with fixing glue according to an embodiment of the present invention;

[0021] Figure 6It is a schematic connection diagram among the magnetic conductive sheet, coil, and support ring in the coil module of the present utility model embodiment.

[0022] Explanation of reference numerals:

[0023] 10 - Coil; 11 - Inlet end; 12 - Outlet end; 20 - Support member; 21 - Support ring; 22 - Extension plate; 23 - Wire groove; 231 - First groove; 232 - Second groove; 24 - Glue groove; 25 - Fixing glue; 26 - Connection part; 27 - Glue layer; 28 - Tin layer; 30 - Circuit board; 40 - Magnetic conductive sheet; X - Gap. Detailed implementation manners

[0024] The following describes the present application based on embodiments, but the present application is not limited to these embodiments only. In the following detailed description of the present application, some specific details are described in detail. Those skilled in the art can fully understand the present application without the description of these details. In order to avoid obscuring the essence of the present application, well - known methods, processes, procedures, components, and circuits are not described in detail.

[0025] In addition, those of ordinary skill in the art should understand that the drawings provided herein are all for illustrative purposes and are not necessarily drawn to scale.

[0026] Unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0027] Unless the context clearly requires otherwise, words such as "including", "comprising", etc. throughout the application document should be interpreted as having an inclusive meaning rather than an exclusive or exhaustive meaning; that is, it is the meaning of "including but not limited to".

[0028] In the description of the present application, it should be understood that terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0029] Figure 1 and Figure 2 are overall structural schematic diagrams of the coil assembly of this embodiment from different angles. Refer to Figure 2, the coil assembly of this embodiment includes a coil 10, a support member 20, and a circuit board 30. The support member 20 includes a support ring 21 and an extension plate 22. Refer to Figure 1 , the coil 10 is disposed on the support ring 21. Refer to Figure 2 , the incoming end 11 and the outgoing end 12 of the coil 10 are electrically connected to the pads 31 on the circuit board 30. Refer to Figure 1 , one end of the extension plate 22 is connected to the support ring 21. The incoming end 11 and the outgoing end 12 of the coil 10 are disposed on the extension plate 22 and continue to extend to the circuit board 30 so that their ends are electrically connected to the pads 31. The length of the extension plate 22 is at least 60% of the distance between the support ring 21 and the circuit board 30, which can provide sufficient supporting force for the incoming end 11 and the outgoing end 12 of the coil 10, making the coil 10 not easily bend and shift during the welding process with the circuit board 30, thereby ensuring the stability of the welding between the coil 10 and the circuit board 30.

[0030] Refer to Figure 1 and Figure 2 , the rest of the coil 10 is fixed on the support ring 21 through an adhesive layer 27, and the circuit board 30 is disposed at the center of the support ring 21. The other end of the extension plate 22 extends towards the circuit board 30. The incoming end 11 and the outgoing end 12 can be accurately aligned with the pads 31 through the extension plate 22. There is a gap X between the extension plate 22 and the circuit board 30 to prevent the extension plate 22 from being too long and affecting the assembly of the circuit board 30. Optionally, the shape of the extension plate 22 can also be designed according to the specific structure. For example, the end of the extension plate 22 close to the circuit board 30 is set to a shape that fits the circuit board 30, so that the extension plate 22 can fit the circuit board 30 without affecting the circuit board 30. At the same time, maintaining a sufficient length of the extension plate 22 helps to clearly point the extending direction of the extension plate 22 towards the pads 31 on the circuit board 30. It can be understood that the specific length of the extension plate 22 can be adjusted according to the specific structure.

[0031] Refer to Figure 1 , the incoming end 11 and the outgoing end 12 extend to the outside of the support ring 21 and are electrically connected to the circuit board 30. Two wire grooves 23 are provided on the support member 20, and the incoming end 11 and the outgoing end 12 extend and are disposed in the wire grooves 23. The wire groove 23 includes a second groove 232 provided on the extension plate 22. The side of the second groove 232 close to the circuit board 30 has an opening, and the incoming end 11 and the outgoing end 12 extend out from the opening of the second groove 232 to extend to the circuit board 30. In addition, the support ring 21 has a certain thickness to reduce the bending angle of the incoming end 11 and the outgoing end 12 and prevent the incoming end 11 and the outgoing end 12 from breaking due to excessive bending angle. Refer to Figure 3 and Figure 5, the wire groove 23 further includes a first groove 231 provided on the outer side surface of the support ring 21, and the first groove 231 communicates with the second groove 232. The first groove 231 can further fix the positions of the inlet end 11 and the outlet end 12, improving the overall stability and aesthetics.

[0032] Referring to Figures 3 - 5 , the two wire grooves 23 are arranged in parallel to prevent the inlet end 11 from being wound around the outlet end 12. The wire groove 23 limits the inlet end 11 and the outlet end 12, further fixing and guiding the extending directions of the inlet end 11 and the outlet end 12. Referring to Figure 2 and Figure 4 , the pads 31 on the circuit board 30 are located in the extending direction of the wire groove 23. Therefore, the inlet end 11 and the outlet end 12 can be aligned with the pads 31 of the circuit board 30 along the wire groove 23. By restricting the extending directions of the inlet end 11 and the outlet end 12 through the wire groove 23, it helps to control the coil layout and improve the stability of the overall structure. The wire groove 23 can also provide physical protection for the internal inlet end 11 and outlet end 12, preventing the inlet end 11 and the outlet end 12 from being bent or worn due to collision and friction with other electronic components.

[0033] Referring to Figure 5 , an adhesive groove 24 is further provided on the extension plate 22, and a fixing adhesive 25 is provided in the adhesive groove 24. Referring to Figure 3 and Figure 5 , the adhesive groove 24 and the second groove 232 are provided on the same side of the extension plate 22, and the adhesive groove 24 communicates with the two second grooves 232 at the same time. The fixing adhesive 25 covers the surfaces of the inlet end 11 and the outlet end 12, bonding and fixing the inlet end 11 and the outlet end 12 in the wire groove 23. Referring to Figure 5 , the adhesive groove 24 is located on the side of the extension plate 22 close to the circuit board 30, so that the fixing adhesive 25 can seal the opening of the second groove 232, further fixing the inlet end 11 and the outlet end 12 of the coil 10.

[0034] Referring to Figure 3 and Figure 5 , the adhesive groove 24 is cross-shaped. The fixing adhesive 25 covers the inlet end 11 and the outlet end 12 along the shape of the adhesive groove 24, and can wrap and fix the inlet end 11 and the outlet end 12 in all directions along the wire groove 23.

[0035] Optionally, the adhesive groove 24 can also be set to other shapes, such as a linear shape parallel or perpendicular to the wire groove 23, a circular shape, etc., or two adhesive grooves 24 can also be provided to correspond to the two second grooves 232.

[0036] Furthermore, the fixing glue 25 in this embodiment is a pressure-sensitive adhesive. The pressure-sensitive adhesive can be quickly fixed when a slight pressure is applied, greatly improving the production efficiency and assembly speed. At the same time, when needed, the pressure-sensitive adhesive can be easily peeled off from the extension plate 22 without causing permanent damage to the extension plate 22 and the coil 10, facilitating disassembly and repair of the product.

[0037] Referring to Figure 3 and Figure 5 , a tin layer 28 is also provided on the outer sides of the inlet end 11 and the outlet end 12. The tin layer 28 is coated on the inlet end 11 and the outlet end 12 starting from the end connected to the pad 31 and extends in the direction of the wire groove 23. The tin layer 28 can make it easier for the coil 10 to be soldered to the pad 31, helping to improve the soldering efficiency. At the same time, the tin layer 28 can also increase the hardness of the coil 10, making the inlet end 11 and the outlet end 12 more stable and not easily bent, reducing the risk of loosening at the connection between the wire end and the pad 31 due to vibration. In this embodiment, the length of the tin layer 28 is greater than the maximum distance between the extension plate 22 and the circuit board 30, that is, the length of the tin layer 28 is greater than the size of the gap X. Therefore, the entire inlet end 11 and outlet end 12 located between the extension plate 22 and the circuit board 30 are coated with the tin layer 28 to ensure overall stability. At the same time, the part of the inlet end 11 and the outlet end 12 located in the wire groove 23 being coated with the tin layer 28 can ensure that the inlet end 11 and the outlet end 12 do not shift when extending out of the wire groove 23.

[0038] Referring to Figures 1 - 5 , a ring-shaped connecting portion 26 is connected to the top of the support ring 21. The outer diameter of the connecting portion 26 is equal to the outer diameter of the support ring 21, and the inner diameter of the connecting portion 26 is smaller than the inner diameter of the support ring 21. The coil assembly in this embodiment can be connected and fixed to other adapted electronic components through the connecting portion 26 and the support ring 21. Referring to Figure 1 and Figure 2 , the connecting portion 26 and the support ring 21 are provided with an adapted port for snap-fitting with other electronic components.

[0039] The support ring 21, the extension plate 22, and the connecting portion 26 in this embodiment are of an integrally formed structure, which helps to improve the installation convenience of the support member 20 and the reliability of the structure.

[0040] The coil assembly of this embodiment supports the inlet and outlet ends of the fixed coil by providing an extension plate between the circuit board and the support ring. A wire groove is also provided on the extension plate. The soldering pad on the circuit board is located in the extension direction of the wire groove, thereby guiding the inlet and outlet ends to be accurately aligned with the soldering pad for easy welding. The inlet and outlet ends between the circuit board and the extension plate are also provided with a tin layer, which can increase the hardness of the coil and prevent the inlet and outlet ends from bending and deviating and affecting the connection with the soldering pad. The coil assembly of this embodiment improves the alignment of the coil with the soldering pad on the circuit board by guiding and supporting the inlet and outlet ends of the coil, thereby improving welding efficiency and welding quality.

[0041] This embodiment also provides a coil module, which includes the coil assembly in the above embodiment. The coil module also includes a magnetic conductive sheet 40, and the magnetic conductive sheet 40 is arranged on one side of the support ring 21. Figure 6 , the magnetic conductive sheet 40 is connected between the coil 10 and the support ring 21. Two layers of glue 27 are provided between the coil 10 and the support ring 21, and the magnetic conductive sheet 40 is located between the two layers of glue 27 and is connected to the coil 10 and the support ring 21 respectively. The magnetic conductive sheet 40 is a ring with a notch, and the notch corresponds to the position of the first groove 231 on the support ring 21. The shape of the magnetic conductive sheet 40 avoids the mutual obstruction between the inlet terminal 11 and the outlet terminal 12 of the coil 10 and the magnetic conductive sheet 40 when extending to the first groove 231, and the notch can further fix the inlet terminal 11 and the outlet terminal 12, thereby improving the structural stability.

[0042] Optionally, the magnetic conductive sheet 40 may also be arranged on the side of the support ring 21 away from the coil 10 , and the shape of the magnetic conductive sheet 40 may also be set to be a complete ring or designed to be a rod, rectangle or other shapes as required.

[0043] The support ring 21 provides a solid frame for the magnetic conductive sheet 40 and the coil 10, which helps to enhance the structural stability of the entire coil module. At the same time, the support ring 21 can also serve as an effective heat conduction path to help disperse the heat from the magnetic conductive sheet, improve the overall thermal stability of the coil module, and further improve the durability and reliability of the coil module.

[0044] In the coil module of this embodiment, the magnetic conductive sheet is connected between the coil and the support ring, and the overall stability and reliability can be improved through the support member. The extension plate on the support ring also enables the inlet and outlet ends of the coil to be accurately attached to the pads of the circuit board, effectively improving production efficiency. At the same time, the extension plate provides a certain support force for the inlet and outlet ends, which can effectively enhance the stability of the connection between the coil and the circuit board and improve the product quality of the coil module.

[0045] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A coil assembly, characterized in that: The coil assembly comprises a coil (10), a support ring (21) and a circuit board (30); the coil (10) is arranged on the support ring (21); an extension plate (22) is arranged between the support ring (21) and the circuit board (30); one end of the extension plate (22) is connected to the support ring (21); an inlet terminal (11) and an outlet terminal (12) of the coil (10) are extended on the extension plate (22) and electrically connected to a pad (31) on the circuit board (30); and a length of the extension plate (22) is at least 60% of a distance between the support ring (21) and the circuit board (30).

2. The coil assembly according to claim 1, characterized in that: A second groove (232) is provided on the extension plate (22); the second groove (232) has an opening on a side close to the circuit board (30); the inlet end (11) and the outlet end (12) of the coil (10) are extended and arranged in the second groove (232); and the solder pad (31) is located in the extension direction of the second groove (232).

3. The coil assembly according to claim 2, characterized in that: The extension plate (22) is provided with two second grooves (232), the inlet end (11) and the outlet end (12) are respectively arranged in the two second grooves (232), and the two second grooves (232) are arranged in parallel.

4. The coil assembly according to claim 2, characterized in that: The outer side surface of the support ring (21) is provided with a first groove (231), and the first groove (231) and the second groove (232) are communicated with each other.

5. The coil assembly according to claim 3, characterized in that: The extension plate (22) is also provided with a glue groove (24), the glue groove (24) being in communication with the two second grooves (232) at the same time, a fixing glue (25) being provided in the glue groove (24), the fixing glue (25) covering the surface of the incoming wire end (11) and the outgoing wire end (12), and the incoming wire end (11) and the outgoing wire end (12) being fixed in the second groove (232) by the fixing glue (25).

6. The coil assembly according to claim 5, characterized in that: The glue groove (24) is arranged in a cross shape.

7. The coil assembly according to claim 1, characterized in that: The outer side of the outlet terminal (12) and the outer side of the inlet terminal (11) are respectively provided with a tin layer (28), and the length of the tin layer (28) is greater than the maximum distance between the extension plate (22) and the circuit board (30).

8. The coil assembly according to claim 1, characterized in that: The top end of the support ring (21) is connected to an annular connecting portion (26), the outer diameter of the connecting portion (26) is equal to the outer diameter of the support ring (21), the inner diameter of the connecting portion (26) is smaller than the inner diameter of the support ring (21), and the top surface of the connecting portion (26) and the top surface of the extension plate (22) are located in the same plane.

9. The coil assembly according to claim 1, characterized in that: The support ring (21) and the coil (10) are connected and fixed via an adhesive layer (27).

10. A coil module, characterized in that: The coil module comprises a coil assembly as claimed in any one of claims 1 to 9.

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