Circuit board

Abstract

The utility model discloses a circuit board which comprises a connecting end and an electric connector arranged on the connecting end, and the electric connector and the edge of the connecting end are arranged in a spaced mode. The circuit board is provided with signal lines electrically connected with the electric connector, the signal line located at the connecting end comprises a first sub-signal line and a second sub-signal line, the first sub-signal line is arranged along the edge of the connecting end, and the second sub-signal line is arranged between the first sub-signal line and the electric connector. By changing the arrangement mode of the signal lines, part of the signal lines are arranged around the electric connector located in the middle of the connecting end, when water vapor intrudes through the edge of the circuit board at the connecting end, the propagation path of the water vapor in contact with the electric connector is increased, the water vapor is not prone to intruding into the electric connector, and the moisture-proof capacity of the circuit board is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit boards, in particular to a circuit board. Background Art

[0002] In integrated circuits, waterproof protection is required to ensure the normal operation of electronic components on circuit boards. In the prior art, the surface of the circuit board can be protected by coating with waterproof protection liquid, but the side of the circuit board is difficult to be coated with waterproof protection liquid due to its small area. Although it can be protected by nano coating, the protection effect of nano coating is poor, and water vapor in the air will still penetrate into the inner layer of the circuit board, affecting the working performance of the components on the circuit board. Utility Model Content

[0003] The embodiment of the utility model provides a circuit board to solve the problem in the prior art that water vapor penetrates into the inner circuit from the side of the circuit board and affects the working performance of components on the circuit board.

[0004] In order to solve the above technical problems, the embodiments of the present utility model disclose the following technical solutions:

[0005] According to a first aspect of the utility model, a circuit board is provided, comprising a connection end and an electrical connector arranged on the connection end, wherein the electrical connector is spaced apart from an edge of the connection end; a signal line electrically connected to the electrical connector is arranged on the circuit board, wherein the signal line located at the connection end comprises a first sub-signal line and a second sub-signal line, wherein the first sub-signal line is arranged along an edge of the connection end, and the second sub-signal line is arranged between the first sub-signal line and the electrical connector.

[0006] Furthermore, the circuit board includes a first metal layer, and the first metal layer is constructed to form the signal lines and current electrodes that are spaced apart.

[0007] Furthermore, the circuit board also includes an ink layer, which covers the first metal layer and fills the groove between the signal line and the current electrode.

[0008] Furthermore, portions of the signal line and the current electrode close to the electrical connector are exposed from the ink layer and are electrically connected to the electrical connector.

[0009] Further, in the thickness direction of the circuit board, the projection of the signal line and the portion of the current electrode exposed from the ink layer overlaps with the projection of the electrical connector.

[0010] Furthermore, the circuit board also includes a protective film, which covers the first metal layer and fills the groove between the signal line and the current electrode.

[0011] Furthermore, portions of the signal line and the current electrode close to the electrical connector are exposed from the protective film and are electrically connected to the electrical connector.

[0012] Further, in the thickness direction of the circuit board, the projection of the signal line and the portion of the current electrode exposed from the protective film overlaps with the projection of the electrical connector.

[0013] Furthermore, the electrical connector is electrically connected to the signal line by metal welding, and the electrical connector is electrically connected to the current electrode by metal welding.

[0014] Furthermore, the circuit board is a flexible circuit board.

[0015] One of the above technical solutions has the following advantages or beneficial effects:

[0016] In the embodiment of the utility model, the routing method of the signal line is changed so that part of the signal line surrounds the electrical connector located in the middle of the connection end. When water vapor invades through the edge of the circuit board at the connection end, the path for the water vapor to contact the electrical connector is increased, making it difficult for water vapor to invade the electrical connector, thereby improving the moisture-proof ability of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0018] Figure 1 It is a planar schematic diagram of a circuit board provided according to the prior art;

[0019] Figure 2 It is a plan view of a circuit board provided according to an embodiment of the utility model;

[0020] Figure 3 is a cross-sectional schematic diagram of a circuit board provided according to an embodiment of the utility model;

[0021] The meanings of the reference numerals are as follows: circuit board 100; connection terminal 110; electrical connector 200; signal line 111; first sub-signal line 112; second sub-signal line 113; current electrode 121; ink layer 130. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining the utility model, and are not intended to limit the utility model.

[0023] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0024] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, 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. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] In the prior art, such as Figure 1 As shown, the electrical connector 200' on the connection end 110' of the circuit board 100' is used to connect with the main board, and has a high waterproof requirement. If water seepage occurs, its working performance will be seriously affected. The wire 111' is used to make an electrical connection with the electrical connector 200'. When the wire 111' is penetrated by water vapor from the edge, water easily seeps along the wire 111' to the electrical connector 200', affecting the working performance of the electrical connector 200'.

[0027] Aiming at the problem in the prior art that water vapor penetrates into the inner circuit from the side of the circuit board and affects the working performance of the components on the circuit board, the utility model provides a circuit board 100. Figure 2 1 is a schematic plan view of the connection end 110 of the circuit board 100 in the embodiment of the present utility model. Figure 3 For along Figure 2 The cross-sectional diagram along the AA' direction is shown in Figure 2 As shown, the circuit board 100 includes a connection end 110 and an electrical connector 200 disposed on the connection end 110. The electrical connector 200 is spaced apart from the edge of the connection end 110, that is, the electrical connector 200 and the edge of the connection end 110 have a first preset distance, and illustratively, the first preset distance is greater than or equal to 2.4 mm. The electrical connector 200 has a protrusion, and the main board has a connector that can be plugged and matched with the protrusion of the electrical connector 200. When the electrical connector 200 and the connector are plugged and matched, the circuit board 100 and the main board are electrically connected.

[0028] A signal line 111 electrically connected to the electrical connector 200 is provided on the circuit board 100. The signal line 111 extends from the rest of the circuit board 100 to the connection end 110 of the circuit board 100. The signal line 111 located at the connection end 110 includes a first sub-signal line 112 and a second sub-signal line 113. The first sub-signal line 112 is arranged along the edge of the connection end 110, and the second sub-signal line 113 is arranged between the first sub-signal line 112 and the electrical connector 200.

[0029] By providing the first sub-signal line 112 surrounding the electrical connector 200, the distance from the signal line 111 to the electrical connector 200 is lengthened compared to the prior art. After water vapor intrudes from the edge of the connection end 110 into the first sub-signal line 112, it still needs to pass through the second sub-signal line 113 to reach the electrical connector 200, making it more difficult for water vapor to intrude into the electrical connector 200, thereby improving the moisture-proof capability of the electrical connector 200. The distance between the first sub-signal line 112 and the edge of the connection end 110 is greater than or equal to a first preset threshold, and the first preset threshold may be 0.3 mm, for example.

[0030] In some embodiments, Figure 2 As shown, the circuit board 100 includes a first metal layer, and the first metal layer is configured as a signal line 111 and a current electrode 121 arranged at intervals. The number of the signal line 111 and the current electrode 121 can be multiple. The signal line 111 is used to connect the electrical connector 200, and the current electrode 121 is used to connect the large current on the circuit board 100. A groove is formed at a position where there is no first metal layer between the signal line 111 and the current electrode 121.

[0031] In some embodiments, Figure 2As shown, the circuit board 100 further includes an ink layer 130, which covers the first metal layer and fills the groove between the signal line 111 and the current electrode 121. The portions of the signal line 111 and the current electrode 121 close to the electrical connector 200 are exposed from the ink layer 130 and are electrically connected to the electrical connector 200. The manufacturing process of the ink layer 130 is to print the ink base material on the first metal layer, and through the processes of pre-baking, exposure and development, the ink base material at the position that does not need to be exposed forms the ink layer 130 through a photochemical reaction during exposure, exposing the portions of the signal line 111 and the current electrode 121 that need to be exposed. In the thickness direction of the circuit board 100, the projection of the portions of the signal line 111 and the current electrode 121 that are exposed from the ink layer 130 overlaps with the projection of the electrical connector 200. At the overlapped portion of the projections, the electrical connector 200 is electrically connected to the signal line 111 and the current electrode 121 through metal welding, and soldering is used for electrical connection.

[0032] Due to process limitations, when the ink layer fills the groove, the surface of the groove cannot be filled to the same height as the surface of the first metal layer on both sides of the groove. There is a height difference between the surface of the groove covered by the ink layer and the surface of the first metal layer, and the height difference is less than or equal to the second preset threshold. For example, the second preset threshold can be 18um.

[0033] In some embodiments, the circuit board 100 further includes a protective film, which covers the first metal layer and fills the groove between the signal line 111 and the current electrode 121. The protective film is adhered to the surface of the first metal layer by a hot pressing process, and a window can be opened on the protective film by a die cutting or laser cutting process, so that the signal line 111 and the current electrode 121 close to the electrical connector 200 are exposed from the protective film and are electrically connected to the electrical connector 200. In the thickness direction of the circuit board 100, the projection of the portion of the signal line 111 and the current electrode 121 exposed from the protective film overlaps with the projection of the electrical connector 200. At the overlap of the projections, the electrical connector 200 and the signal line 111 are electrically connected by metal welding, and the electrical connector 200 and the current electrode 121 are electrically connected by metal welding. Exemplarily, soldering is used to achieve electrical connection.

[0034] The first metal layer is covered with the ink layer 130. Since the ink base material is fluid, the ink layer 130 can fill the groove between the signal line 111 and the current electrode 121 as much as possible. The height difference between the surface at the groove and the surface of the signal line 111 and the current electrode 121 is significantly smaller than the height difference when the first metal layer is covered with a protective film. A smoother surface of the circuit board 100 can be obtained, further improving the moisture-proof performance of the circuit board 100 and reducing the possibility of water vapor penetrating into the internal circuit.

[0035] In some embodiments, the circuit board is a flexible circuit board.

[0036] In some embodiments, the circuit board may have multiple metal layers, which are electrically isolated by insulating layers. On the surface of the circuit board where no electrical connector is provided, an ink layer or a protective film is provided on the metal layer to protect the metal layer from water vapor erosion.

[0037] The above embodiments are only used to help understand the structure and core concept of the utility model. For ordinary technicians in this technical field, the utility model can also be improved and modified without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A circuit board, characterized in that: The circuit board comprises a connection end and an electrical connector arranged on the connection end, wherein the electrical connector is arranged spaced apart from an edge of the connection end; A signal line electrically connected to the electrical connector is provided on the circuit board, and the signal line located at the connection end includes a first sub-signal line and a second sub-signal line, the first sub-signal line is arranged along the edge of the connection end, and the second sub-signal line is arranged between the first sub-signal line and the electrical connector.

2. The circuit board according to claim 1, characterized in that: The wiring board includes a first metal layer, and the first metal layer is configured to form the signal lines and current electrodes that are spaced apart.

3. The circuit board according to claim 2, characterized in that: The circuit board further includes an ink layer, which covers the first metal layer and fills the groove between the signal line and the current electrode.

4. The circuit board according to claim 3, characterized in that: Portions of the signal line and the current electrode close to the electrical connector are exposed from the ink layer and are electrically connected to the electrical connector.

5. The circuit board according to claim 4, characterized in that: In the thickness direction of the circuit board, projections of portions of the signal line and the current electrode exposed from the ink layer overlap with a projection of the electrical connector.

6. The circuit board according to claim 2, characterized in that: The circuit board further includes a protective film, which covers the first metal layer and fills the groove between the signal line and the current electrode.

7. The circuit board according to claim 6, characterized in that: Portions of the signal line and the current electrode close to the electrical connector are exposed from the protective film and are electrically connected to the electrical connector.

8. The circuit board according to claim 7, characterized in that: In the thickness direction of the wiring board, projections of portions of the signal line and the current electrode exposed from the protective film overlap with a projection of the electrical connector.

9. The circuit board according to claim 2, characterized in that: The electrical connector is electrically connected to the signal line by metal welding, and the electrical connector is electrically connected to the current electrode by metal welding.

10. The circuit board according to any one of claims 1 to 9, characterized in that: The circuit board is a flexible circuit board.

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