FPC structure with connector

Abstract

The utility model discloses an FPC structure with a connector, and relates to the FPC field, the FPC structure comprises a flexible circuit board and a connector, the flexible circuit board is provided with a bonding pad, the bonding pad is provided with a unidirectional conductive adhesive layer, the connector is pressed on the bonding pad, and the connector is fixed on the bonding pad through the conductive adhesive layer; according to the utility model, the one-way conducting conductive adhesive layer is pasted on the bonding pad of the flexible circuit board in advance, and the connector and the bonding pad are bonded and fixed by using the conductive adhesive layer, so that the connector is accurately installed and fixed and is not easy to shake and shift, the subsequent tin soldering operation is facilitated, and the production efficiency is improved. The flexible circuit board connector can avoid deviation caused by position deviation of the connector on the flexible circuit board during later reflow soldering, and is simple in overall structure, low in production cost, convenient to process and operate and high in production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of FPC, in particular to an FPC structure with a connector. Background Art

[0002] FPC (Flexible Printed Circuit) is a flexible circuit board made of polyimide or polyester film as a substrate, with high reliability and excellent flexibility. The connector on the flexible circuit board needs to be reflowed after mounting, such as the flexible circuit board connector welding method disclosed in patent application number 202210700065.1 and the connector welding method disclosed in the flexible circuit board. Flexible circuit boards have a wide range of applications, such as being used in mobile phone communication tools to achieve communication connections. Figure 1 As shown in the figure, it is a structural diagram of the common FPC connector. Since the connector on the FPC needs to be reflowed after mounting, the solder paste melts during reflow. According to the surface tension of the solder paste, the terminal position will change when the connector is installed. There will often be deviation problems, such as deviation in the upper and lower positions, or deviation in angles. This phenomenon will cause the terminal customer to be unable to buckle the connector for use during assembly. Figure 2 , 3 As shown. In order to solve the problem of misalignment, patent application No. 202223052391.0 discloses an FPC with a connector, which includes an FPC, a connector is engaged on the side wall of the FPC; a connector is engaged on the outside of the connector, and the connector is engaged on the FPC; the connector includes a limit frame, the limit frame is engaged on the outside of the connector, and a positioning component is fixed on the limit frame, and the positioning component is engaged on the FPC. The connector is engaged with the outside of the connector, and the limit frame on the connector fixes the positioning component to complete the absorption of the connector to avoid tilting. However, additional components are added to this structure, which not only increases the complexity of the structure, but also increases the production cost, while also adding additional assembly processes and reducing production efficiency. To this end, the utility model discloses an FPC structure with a connector to solve the above problems. Utility Model Content

[0003] Based on this, it is necessary to provide an FPC structure with a connector to address the above technical problems. By pre-pasting a layer of unidirectional conductive adhesive layer on the soldering pad of the flexible circuit board, the connector is bonded and fixed to the soldering pad using the conductive adhesive layer, so that the connector can be accurately installed and fixed, not easy to shake and shift, and convenient for subsequent soldering operations. It can avoid the displacement of the connector on the flexible circuit board during the subsequent reflow soldering, and the overall structure is simple, the production cost is low, the processing operation is convenient, and the production efficiency is high.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] An FPC structure with a connector comprises a flexible circuit board and a connector. The flexible circuit board is provided with a soldering pad, the soldering pad is provided with a unidirectional conductive adhesive layer, the connector is pressed onto the soldering pad, and the connector is fixed to the soldering pad by bonding with the conductive adhesive layer.

[0006] As a preferred implementation of the FPC structure with connector provided by the utility model, the conductive adhesive layer is an anisotropic conductive adhesive film.

[0007] As a preferred implementation of the FPC structure with a connector provided by the utility model, the conductive adhesive layer consists of two sheets and is respectively arranged on two sides of the connector.

[0008] As a preferred implementation of the FPC structure with a connector provided by the utility model, the connector includes pins, and the pins are fixed to the flexible circuit board by glue.

[0009] As a preferred implementation of the FPC structure with a connector provided by the utility model, the glue covers the conductive glue layer.

[0010] As a preferred implementation of the FPC structure with a connector provided by the utility model, it also includes a reinforcing plate, and the reinforcing plate is arranged on a side of the flexible circuit board away from the connector.

[0011] As a preferred implementation of the FPC structure with a connector provided by the utility model, a positioning protrusion is provided on the reinforcing plate, a through hole is provided on the flexible circuit board, and the positioning protrusion passes through the through hole and abuts against the connector.

[0012] As a preferred implementation of the FPC structure with a connector provided by the utility model, the cross-sectional size of the positioning protrusion is consistent with the size of the through hole.

[0013] As a preferred implementation of the FPC structure with a connector provided by the utility model, the positioning protrusion is a prism structure, and there are two positioning protrusions symmetrically arranged at both ends of the connector.

[0014] As a preferred implementation of the FPC structure with connector provided by the utility model, the positioning protrusion is a cylindrical structure, and concave arc structures are provided at the four corners of the connector. The positioning protrusion passes through the through hole and fits with the groove structure.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The FPC structure with connector provided by the utility model has a one-way conductive adhesive layer attached to the pad of the flexible circuit board in advance, and the connector is bonded and fixed to the pad by the conductive adhesive layer, so that the connector is accurately installed and fixed, not easy to shake and shift, convenient for subsequent soldering operations, and can avoid the displacement of the connector on the flexible circuit board during the later reflow soldering. The overall structure is simple, the production cost is low, the processing operation is convenient, and the production efficiency is high.

[0017] 2. The FPC structure with a connector provided by the utility model uses glue to bond the connector pins to the flexible circuit board, thereby improving the firmness of the connector and the flexible circuit board after bonding and preventing the connector from falling off due to force. The conductive adhesive layer is covered with glue to avoid water vapor penetration, thereby ensuring the unidirectional conductivity of the conductive adhesive layer and the conductive performance of the connector and the flexible circuit board.

[0018] 3. The FPC structure with a connector provided by the utility model has a positioning protrusion on the reinforcement plate and a through hole on the flexible circuit board. The positioning protrusion is used to abut against the connector to achieve planar positioning of the connector, which is convenient for accurate bonding and fixing of the connector, and also avoids the later planar displacement of the connector, further improving the connection firmness between the connector and the flexible circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a front and side schematic diagram of a conventional flexible circuit board structure with a connector;

[0021] Figure 2 It is a schematic diagram of the upward and downward deviation of the connector after the reflow soldering of the connector on the flexible circuit board;

[0022] Figure 3 It is a schematic diagram of the angular deviation of the connector after the connector on the flexible circuit board is reflowed;

[0023] Figure 4 It is a schematic diagram of the soldering pad of the flexible circuit board after being attached to the conductive adhesive layer in the utility model;

[0024] Figure 5 A front view schematic diagram of the overall structure of the FPC structure with a connector provided by the utility model;

[0025] Figure 6A side view schematic diagram of the overall structure of the FPC structure with a connector provided by the utility model;

[0026] Figure 7 This is a schematic diagram of a soldering pad on a flexible circuit board after being attached to a conductive adhesive layer in Example 3 of the utility model;

[0027] Figure 8 A front view schematic diagram of the overall structure of the FPC structure with a connector in Example 3 of the utility model;

[0028] Fig. 9 A side view schematic diagram of the overall structure of the FPC structure with a connector in Example 3 of the utility model;

[0029] Fig.10 Another schematic diagram of the solder pad on the flexible circuit board after being attached to the conductive adhesive layer in Example 3 of the utility model;

[0030] Fig.11 Another front view schematic diagram of the overall structure of the FPC structure with a connector in Embodiment 3 of the present utility model;

[0031] Fig.12 Another side view schematically shows the overall structure of the FPC structure with a connector in Example 3 of the present utility model.

[0032] The markings in the figure are as follows:

[0033] 1. Flexible circuit board; 101. Through hole; 2. Connector; 201. Pin; 202. Groove structure; 3. Solder pad; 4. Conductive adhesive layer; 5. Glue; 6. Reinforcement plate; 601. Positioning protrusion. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0035] As described in the background technology, the connector on the FPC needs to be reflowed after mounting. During the reflow, the solder paste melts. According to the surface tension of the solder paste, the terminal position will change when the connector is installed. Misalignment problems often occur, such as upper and lower position misalignment, or angle misalignment. This phenomenon will cause the terminal customer to be unable to engage the connector during assembly. In the existing FPC structure to solve the misalignment, additional components are added, which not only increases the complexity of the structure, but also increases the production cost, while also adding additional assembly processes, reducing production efficiency.

[0036] In order to solve this technical problem, the utility model provides an FPC structure with a connector 2, which is applied to the FPC field.

[0037] Specifically, please refer to Figure 4-6 The FPC structure with connector 2 specifically includes a flexible circuit board 1 and a connector 2. A soldering pad 3 is provided on the flexible circuit board 1. A unidirectional conductive adhesive layer 4 is provided on the soldering pad 3. The connector 2 is pressed onto the soldering pad 3 so that the connector 2 is bonded and fixed to the soldering pad 3 through the conductive adhesive layer 4.

[0038] The FPC structure with the connector 2 provided by the utility model has a unidirectional conductive adhesive layer 4 attached to the pad 3 of the flexible circuit board 1 in advance, and the connector 2 is bonded and fixed to the pad 3 by using the conductive adhesive layer 4, so that the connector 2 is accurately installed and fixed, not easy to shake and shift, and convenient for subsequent soldering operations, and can avoid the displacement of the connector 2 on the flexible circuit board 1 caused by the displacement of the position during the subsequent reflow soldering. The overall structure is simple, the production cost is low, the processing operation is convenient, and the production efficiency is high.

[0039] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] Example 1

[0043] Please refer to Figure 4-6, provides an FPC structure with a connector 2, which includes a flexible circuit board 1 and a connector 2, a soldering pad 3 is provided on the flexible circuit board 1, a unidirectional conductive adhesive layer 4 is provided on the soldering pad 3, the connector 2 is pressed onto the soldering pad 3, so that the connector 2 is bonded and fixed to the soldering pad 3 through the conductive adhesive layer 4, and the connector 2 is bonded to the conductive adhesive layer 4, so that the connector 2 can be pre-bonded and fixed, which is convenient for the subsequent soldering process of the connector 2, and at the same time, the hook rod can also avoid the displacement of the connector 2 on the flexible circuit board 1 during the subsequent reflow soldering, which is convenient for the terminal customer to assemble.

[0044] The conductive adhesive layer 4 is preferably anisotropic conductive film, namely ACF. Anisotropic conductive film is a material with special conductive properties, and its characteristics include the following aspects:

[0045] Directional conductivity: Anisotropic conductive film has good conductivity in one direction and may be poor in another direction. This property makes it effective in conducting electricity in a specific direction and acts as an insulator in other directions.

[0046] Flexibility: Anisotropic conductive adhesive films are usually flexible materials with good bendability and flexibility, which allows them to adapt to various curved surfaces or bent shapes and are widely used in flexible electronic devices and wearable technologies.

[0047] Thin design: This type of conductive film is usually very thin, which can achieve a thin design and reduce the overall thickness of the device. It is particularly suitable for some applications with high space and weight requirements.

[0048] High conductivity: Anisotropic conductive film has high conductivity in its conductive direction and can effectively conduct current, making it suitable for electronic components that require high conductivity.

[0049] Based on the above characteristics of the anisotropic conductive film, in this embodiment, the anisotropic conductive film is used as the unidirectional conductive adhesive layer 4 to bond and fix the connector 2 and the pad 3, which can achieve unidirectional conductivity between the pad 3 and the pin 201 on the connector 2, thereby ensuring the stability of the electrical connection between the connector 2 and the pad 3.

[0050] Specifically, the conductive adhesive layer 4 is made of two pieces, which are respectively arranged at the pin 201 positions on both sides of the connector 2. At the same time, the size of the conductive adhesive layer 4 is consistent with the size of the pin 201 area on both sides of the connector 2, so that the conductive adhesive layer 4 can cover the pad 3, ensuring that each pin 201 can be bonded and fixed to the pad 3 through the conductive adhesive layer 4.

[0051] Example 2

[0052] The FPC structure with connector 2 provided in Example 1 is further optimized, specifically, as follows Figure 5 ,6 As shown, the connector 2 includes pins 201, which are arranged on both sides of the connector 2. The pins 201 are fixed to the flexible circuit board 1 by glue 5. The glue 5 is an insulating glue layer, and the glue 5 covers the conductive glue layer 4, so that the glue 5 can wrap the connection area between the pin 201 and the pad 3.

[0053] Through the above structural design, the pin 201 of the connector is bonded and fixed to the flexible circuit board 1 by glue 5, which improves the firmness of the connector 2 and the flexible circuit board 1 after bonding and prevents the connector 2 from falling off due to force. The conductive adhesive layer 4 is covered by glue 5 to avoid water vapor penetration, thereby ensuring the unidirectional conductivity of the conductive adhesive layer 4 and the conductive performance of the connector 2 and the flexible circuit board 1.

[0054] Example 3

[0055] The FPC structure with connector 2 provided in Example 2 is further optimized. Specifically, Figure 7-12 As shown, a reinforcing plate 6 is provided on the flexible circuit board 1, and the reinforcing plate 6 is provided on the side of the flexible circuit board 1 away from the connector 2. The reinforcing plate 6 is utilized to improve the rigidity and strength of the flexible circuit board 1 at the connector 2, so as to facilitate the plugging operation of the connector 2 on the flexible circuit board 1 in subsequent use.

[0056] Furthermore, a positioning protrusion 601 is provided on the reinforcing plate 6, and a through hole 101 is provided on the flexible circuit board 1. The positioning protrusion 601 passes through the through hole 101 and abuts against the connector 2. The abutment between the positioning protrusion 601 and the side of the connector 2 is used to achieve planar positioning and limiting of the connector 2. At the same time, the cross-sectional size of the positioning protrusion 601 is consistent with the size of the through hole 101. The position of the through hole 101 avoids the coil of the flexible circuit board 1. At the same time, insulating glue is used to insulate the area around the through hole 101.

[0057] The structure and position design of the positioning protrusion 601:

[0058] like Figure 7-9 As shown, the positioning protrusion 601 is a prismatic structure, and there are two positioning protrusions 601 that are symmetrically arranged at both ends of the connector 2. The two positioning protrusions 601 are respectively arranged on both sides of the connector 2 where the pin 201 is not arranged. Since the existing connector 2 structure is a rectangular structure, the side of the positioning protrusion 601 is abutted against the side of the connector 2 to achieve the limitation of the left and right directions of the connector 2. Since the position of the pin 201 is fixed by glue 5 and the conductive adhesive layer 4, the connection stability of the connector 2 on the flexible circuit board 1 is guaranteed, and the plane displacement of the connector 2 is avoided.

[0059] like Figure 10-12As shown, the positioning protrusion 601 can also be other structures. Specifically, the positioning protrusion 601 is a cylindrical structure. The four corners of the connector 2 are provided with concave arc structures. The positioning protrusion 601 passes through the through hole 101 and fits with the groove structure 202. Since the four corners of the existing connector 2 themselves have a concave arc structure, it is only necessary to design the diameter of the positioning protrusion 601 on the reinforcement plate 6 to be consistent with the diameter of the concave arc structure, thereby saving the processing steps. The positioning protrusion 601 is provided at the four corners of the connector 2, which can limit the positioning of the connector 2 in the front, back, left and right directions on the same plane to prevent the connector 2 from shifting. Moreover, since four positioning protrusions 601 are provided, the connector 2 can also be positioned to ensure the position of the connector 2.

[0060] Through the above-mentioned structural design, a positioning protrusion 601 is set on the reinforcement plate 6, and a through hole 101 is set on the flexible circuit board 1. The positioning protrusion 601 is used to abut against the connector 2 to achieve planar positioning of the connector 2, which is convenient for accurate bonding and fixing of the connector 2, and also avoids the later planar displacement of the connector 2, thereby further improving the connection firmness between the connector 2 and the flexible circuit board 1.

[0061] The preparation method of the FPC structure with the connector 2 provided by the utility model is as follows: after the preparation of the pad 3 on the flexible circuit board 1 is completed, a conductive adhesive layer 4 is attached to the pad 3, and then the connector 2 is pressed onto the pad 3, so that the pin 201 on the connector 2 completes the circuit conduction with the pad 3 through the conductive adhesive layer 4, the conductive adhesive layer 4 is unidirectionally conductive, and the short circuit problem of adjacent pins 201 is avoided. The pin 201 of the connector 2 is bonded and fixed to the connector 2 by using the conductive adhesive layer 4. At the same time, in order to improve the firmness of the connector 2 after being bonded to the flexible circuit board 1, the pin 201 of the connector 2 is fixed to the FPC surface by dispensing glue 5 to prevent the connector 2 from falling off under force. The glue 5 also covers the conductive adhesive layer 4 to avoid water vapor penetration and ensure the conductive performance. At the same time, the positioning protrusion 601 arranged on the reinforcing plate 6 passes through the through hole 101 to perform plane limit and positioning on the connector 2, further improving the stability of the connector 2, and improving the installation accuracy of the connector 2, thereby improving the production efficiency.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. An FPC structure with a connector, comprising a flexible circuit board and a connector, wherein a pad is provided on the flexible circuit board, characterized in that: A unidirectional conductive adhesive layer is disposed on the pad, and the connector is pressed onto the pad so that the connector is fixed to the pad through the conductive adhesive layer.

2. The FPC structure with a connector according to claim 1, characterized in that: The conductive adhesive layer is an anisotropic conductive adhesive film.

3. The FPC structure with a connector according to claim 2, characterized in that: The conductive adhesive layer consists of two sheets and is respectively arranged on two sides of the connector.

4. The FPC structure with a connector according to claim 1, characterized in that: The connector includes pins, and the pins are fixed to the flexible circuit board by glue.

5. The FPC structure with a connector according to claim 4, characterized in that: The glue covers the conductive glue layer.

6. The FPC structure with a connector according to claim 1, characterized in that: The invention also comprises a reinforcing plate, which is arranged on a side of the flexible circuit board away from the connector.

7. The FPC structure with a connector according to claim 6, characterized in that: The reinforcing plate is provided with a positioning protrusion, the flexible circuit board is provided with a through hole, and the positioning protrusion passes through the through hole and abuts against the connector.

8. The FPC structure with a connector according to claim 7, characterized in that: The cross-sectional dimension of the positioning protrusion is consistent with the dimension of the through hole.

9. The FPC structure with a connector according to claim 8, characterized in that: The positioning protrusion is a prism structure, and there are two positioning protrusions which are symmetrically arranged at two ends of the connector.

10. The FPC structure with a connector according to claim 8, characterized in that: The positioning protrusion is a cylindrical structure, and concave arc structures are arranged at the four corners of the connector. The positioning protrusion passes through the through hole and fits into the groove structure.

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