Circuit board, circuit board interconnection structure and circuit board manufacturing method

Abstract

The invention discloses a circuit board, a circuit board interconnection structure and a circuit board manufacturing method. The circuit board comprises a circuit board main body and a plurality of conductive contact pieces. The circuit board main body is provided with a plug board part, and the plug board part is provided with a contact piece placement surface; the plurality of conductive contact pieces are strip-shaped, and all the conductive contact pieces are arranged on the contact piece placement surface of the plugging plate part in parallel at intervals; and one side, deviating from the plugging plate part, of the conductive contact piece is provided with a conductive convex part clamping groove. By forming the conductive convex part clamping grooves at the conductive contact pieces, when the circuit board is installed on the connector, the plugging plate part is inserted into the plugging grooves, and the conductive convex parts of the connector are clamped into the conductive convex part clamping grooves of the conductive contact pieces in a one-to-one correspondence manner, so that the conductive convex parts are in point contact or line contact with the corresponding conductive contact pieces, and the conductive convex parts are clamped into the conductive convex part clamping grooves of the conductive contact pieces in a one-to-one correspondence manner. The limiting effect of the conductive convex part on the conductive contact piece is improved in a clamping mode, so that when the circuit board is installed on the connector, the risk of loosening between the circuit board and the connector can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of circuit boards, and in particular to a circuit board, a circuit board interconnection structure and a circuit board manufacturing method. Background Art

[0002] The electrical signal control is performed through the circuit board inside the equipment. The circuit board and the main board usually need to be pluggable and interconnected. Therefore, a connector is set on the main board. The connector has a plug-in slot, and the slot wall of the plug-in slot has a conductive protrusion; the circuit board has a plug-in board part, and the plug-in board part is provided with a plurality of parallel and spaced strip-shaped conductive contacts, which are commonly known as gold fingers. The circuit board is inserted into the plug-in slot through the plug-in board part, and the conductive protrusions are in point contact or line contact with the conductive contacts one by one to achieve the interconnection between the circuit board and the main board. At present, after the equipment has been running for a long time, the vibration generated can easily cause the circuit board and the connector to loosen, affecting the stability of the interconnection between the circuit board and the main board. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a circuit board, which can reduce the risk of loosening between the circuit board and the connector when installed on the connector.

[0004] The present invention also provides a circuit board interconnection structure having the above circuit board.

[0005] The present invention also provides a circuit board manufacturing method for manufacturing the above circuit board.

[0006] According to the first aspect of the present invention, the circuit board comprises a circuit board body and a plurality of conductive contacts. The circuit board body is provided with a plug-in board portion, the plug-in board portion having a contact placement surface; the plurality of conductive contacts are in the shape of strips, and all the conductive contacts are arranged parallel to each other and spaced apart on the contact placement surface of the plug-in board portion; wherein a conductive protrusion slot is provided on the side of the conductive contact away from the plug-in board portion.

[0007] The circuit board according to the embodiment of the first aspect of the present invention has at least the following beneficial effects: by forming a conductive protrusion slot at the conductive contact, when the circuit board is installed in the connector, the plug-in board part is inserted into the plug-in slot, and the conductive protrusions of the connector are snapped into the conductive protrusion slots of the conductive contact one by one, so that the conductive protrusions maintain point contact or line contact with the corresponding conductive contacts, and the limiting effect of the conductive protrusions on the conductive contacts is improved by snapping, so that when the circuit board is installed in the connector, the risk of loosening between the circuit board and the connector can be reduced.

[0008] According to some embodiments of the present invention, the plug-in board portion is provided with a groove on the contact placement surface, the conductive contact is partially recessed and fits against the groove wall of the groove, and the partially recessed portion of the conductive contact forms the conductive protrusion slot.

[0009] According to some embodiments of the present invention, the width of the groove is A, and the depth of the groove is B, satisfying A / B≥1.

[0010] According to some embodiments of the present invention, the thickness of the conductive contact sheet is C, which satisfies 80 μm ≥ C ≥ 40 μm.

[0011] According to some embodiments of the present invention, the extension direction of the groove is perpendicular to the extension direction of the conductive contact and passes through the rows of conductive contacts, and the rows of conductive contacts are partially recessed and adhere to the groove wall surface of the groove.

[0012] According to some embodiments of the present invention, the cross-section of the groove is rectangular, and the cross-section of the conductive protrusion slot is rectangular.

[0013] According to the second aspect of the present invention, the circuit board interconnection structure comprises the above-mentioned circuit board and a connector. The connector is provided with a plug-in slot, the side wall of the plug-in slot is provided with a plurality of conductive protrusions, the plug-in board part is plugged into the plug-in slot, the conductive protrusions are correspondingly engaged with the conductive protrusion slots, and there are at least two contact positions between the conductive protrusions and the corresponding slot walls of the conductive protrusion slots.

[0014] The circuit board interconnection structure according to the embodiment of the second aspect of the present invention has at least the following beneficial effects: the number of contact points with the conductive protrusion is increased by means of the conductive protrusion slot, thereby improving the stability of the electrical signal interconnection between the conductive protrusion and the conductive contact, that is, improving the stability of the electrical signal interconnection between the connector and the circuit board, and improving the degree of anti-loosening of the connector and the circuit board.

[0015] According to some embodiments of the present invention, the cross-section of the conductive protrusion is arc-shaped; the conductive protrusion abuts against the bottom wall of the conductive protrusion slot, and the conductive protrusion abuts against one or both sides of the notch edge of the conductive protrusion slot.

[0016] According to some embodiments of the present invention, the cross-section of the conductive protrusion is arc-shaped; the conductive protrusion abuts against the edges of the notches on both sides of the conductive protrusion slot.

[0017] According to the third aspect of the present invention, the circuit board of the embodiment includes the following steps: obtaining a circuit board body; processing a groove on the contact placement surface of the plug-in board part of the circuit board body; copper plating and nickel-gold plating in sequence on the contact placement surface, the copper plating layer and the nickel-gold plating layer are stacked to form a conductive contact, the conductive contact is partially recessed and fits to the groove wall of the groove to form a conductive protrusion slot.

[0018] The circuit board according to the third aspect of the present invention has at least the following beneficial effects: a circuit board with conductive contacts is manufactured by the above-mentioned circuit board manufacturing method, and the processing method is simple and the processability is good.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a front view schematic diagram of a circuit board according to an embodiment of the present invention;

[0022] Figure 2 A three-dimensional schematic diagram of a partial structure of a circuit board according to an embodiment of the present invention;

[0023] Figure 3 A schematic cross-sectional view of a circuit board according to an embodiment of the present invention when installed on a connector;

[0024] Figure 4 For the embodiment of the present invention Figure 3 A local enlarged schematic diagram of F;

[0025] Figure 5 The figure is a flow chart of a method for manufacturing a circuit board according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] Circuit board body 100, plug-in board portion 110, contact placement surface 120, groove 130;

[0028] Conductive contact sheet 200, conductive protrusion slot 210, slot edge 211;

[0029] Connector 300 , plug slot 310 , conductive protrusion 320 . DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 should not be understood as a limitation on the present invention.

[0032] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] The electrical signals inside the device are controlled by circuit boards. The circuit boards and the main board usually need to be pluggable and interconnected. The main board is also a type of circuit board.

[0035] Reference Figure 1 to Figure 2 , is a circuit board of an embodiment of the present invention, comprising a circuit board body 100 and a plurality of conductive contacts 200. The circuit board body 100 is provided with a plug-in board portion 110, and the plug-in board portion 110 has a contact placement surface 120; the conductive contacts 200 are strip-shaped, and all the conductive contacts 200 are arranged parallel to each other and spaced apart on the contact placement surface 120 of the plug-in board portion 110; wherein, a conductive protrusion slot 210 is provided on the side of the conductive contact 200 away from the plug-in board portion 110.

[0036] By forming a conductive protrusion slot 210 at the conductive contact 200, when the circuit board is installed on the connector 300, the plug-in board part 110 is inserted into the plug-in slot 310, and the conductive protrusions 320 of the connector 300 are snapped into the conductive protrusion slots 210 of the conductive contact 200 one by one, so that the conductive protrusions 320 and the corresponding conductive contacts 200 maintain point contact or line contact, and at the same time, the limiting effect of the conductive protrusions 320 on the conductive contacts 200 is improved by snapping, so that when the circuit board is installed on the connector 300, the risk of loosening between the circuit board and the connector 300 can be reduced.

[0037] Specifically, the conductive contact piece 200 on the circuit board can be specifically configured by those skilled in the art according to actual needs.

[0038] In the embodiment, the plug-in board part 110 is provided with a groove 130 on the contact placement surface 120, and the conductive contact 200 is partially recessed and fits on the groove wall of the groove 130, and the partially recessed portion of the conductive contact 200 forms a conductive convex portion slot 210. By making the groove 130 in the plug-in board part 110, and the conductive contact 200 is partially recessed and fits on the groove wall of the groove 130, a conductive convex portion slot 210 is formed on the side of the conductive contact 200 away from the plug-in board part 110. When the thickness of the conductive contact 200 can be made extremely thin, a complete conductive convex portion slot 210 can still be formed, and there is no need to make the conductive contact 200 thicker and then process the conductive convex portion slot 210 on the conductive contact 200, so that the manufacturing cost of the circuit board is basically not increased, and the material cost of the circuit board is saved.

[0039] It is conceivable that, in some embodiments, the conductive contact sheet 200 may be made thicker, and then the conductive protrusion slot 210 may be processed on the conductive contact sheet 200 .

[0040] In the embodiment, the width of the groove 130 is A, and the depth of the groove 130 is B, satisfying A / B≥1. Specifically, after the plug-in board part 110 processes the groove 130 on the contact placement surface 120, it is necessary to electroplate copper and nickel-gold on the contact placement surface 120 to make the conductive contact 200. In the electroplating process, if the size of the groove 130 is not appropriate, it is easy to cause insufficient electroplating of the groove wall surface of the groove 130, affecting the thickness and integrity of the electroplating layer, that is, affecting the production of the conductive contact 200 in the groove 130. After testing, when the width-to-depth ratio of the groove 130 A / B≥1, that is, when the width of the groove 130 A≥B, the electroplating solution can fully enter the groove 130, so that the thickness of the conductive contact 200 in the groove 130 meets the conventional requirements of signal transmission, so that the electrical signal transmission effect is better.

[0041] In the embodiment, the thickness of the conductive contact 200 is C, which satisfies 80μm≥C≥40μm. When the plug-in board portion 110 is inserted into the plug-in slot 310, if the thickness of the conductive contact 200 is too small, the circuit board is easily damaged by friction during frequent plugging and unplugging, and if it is too thick, it is easy to waste materials. Therefore, the thickness of the conventional conductive contact 200 is generally between 10μm and 80 microns. However, in this embodiment, when the plug-in board portion is plugged into the plug-in slot 310, since the conductive protrusion 320 is engaged with the conductive protrusion slot 210, during the process of plugging and unplugging the circuit board, the conductive protrusion 320 will cause greater friction to the notch edge 211 of the conductive protrusion slot 210, so that the conductive contact 200 has a higher risk of friction damage. Therefore, after testing, the thickness of the conductive contact 200 is selected to meet 80μm≥C≥40μm, which can not only avoid wasting materials, but also basically avoid the risk of the conductive contact 200 being damaged by friction.

[0042] In the embodiment, the extending direction of the groove 130 is perpendicular to the extending direction of the conductive contact 200 and passes through the row of conductive contacts 200, and the row of conductive contacts 200 are partially recessed and fit to the groove wall of the groove 130. With the above structure, when processing the groove 130 on the contact placement surface 120 of the plug-in board 110, a longer groove 130 can be processed, and then when all the conductive contacts 200 located on the same contact placement surface 120 are manufactured, the conductive protrusion slots 210 of different conductive contacts 200 can be formed by recessing and fitting directly in the groove 130, thereby significantly saving the processing time of the groove 130, and there is no need to process a shorter groove 130 at the position corresponding to each conductive contact 200, thereby saving processing costs.

[0043] It is conceivable that, in some embodiments, the grooves 130 may be processed at the preset positions of each conductive contact piece 200 , and in this case, each conductive contact piece 200 forms a conductive protrusion slot 210 at the corresponding groove 130 .

[0044] In the embodiment, the cross section of the groove 130 is rectangular, and the cross section of the conductive protrusion slot 210 is rectangular. The cross section of the groove 130 is rectangular, and an end mill can be used directly for linear machining during machining, which is quick and simple. Correspondingly, since the conductive contact 200 is partially recessed and fits on the groove wall of the groove 130, the conductive protrusion slot 210 is also rectangular.

[0045] It is conceivable that, in some embodiments, the cross-section of the groove 130 may also be other shapes, such as an arc shape, etc., and the corresponding groove 130 may also be processed using, for example, a ball cutter.

[0046] Specifically, the length direction of the conductive contact 200 is perpendicular to the extension direction of the groove 130 , so that all the conductive protrusion slots 210 are arranged along a straight line, which facilitates the layout and production of the conductive protrusion 320 of the connector 300 and the production of the conductive contact 200 .

[0047] Furthermore, the width of the conductive contact 200 is D, satisfying D = A = B. When the width of the groove 130 is equal to the depth, and the width of the conductive contact 200 is equal to the width of the guide slot, the conductive contact 200 is partially sunken and fitted in the groove 130 relatively well, and the comprehensive use effect is better.

[0048] Specifically, a base copper layer is sandwiched between the conductive contact 200 and the contact placement surface 120 in the area outside the groove 130 , so as to improve the overall conductivity of the conductive contact 200 .

[0049] Reference Figure 3 to Figure 4 The present invention also discloses a circuit board interconnection structure, including the above-mentioned circuit board and a connector 300. The connector 300 is provided with a plug-in slot 310, and the side wall of the plug-in slot 310 is provided with a plurality of conductive protrusions 320. The plug-in board part 110 is plugged into the plug-in slot 310, and the conductive protrusions 320 are correspondingly engaged with the conductive protrusion slots 210, and there are at least two contact positions between the conductive protrusions 320 and the corresponding slot walls of the conductive protrusion slots 210.

[0050] There are at least two contact positions between the conductive protrusion 320 and the groove wall of the conductive protrusion slot 210. In the existing circuit board interconnection structure, since the conductive contact sheet 200 is a straight strip, the conductive protrusion 320 usually has one contact position with the conductive contact sheet 200, and it is usually a point contact or a line contact. Therefore, the circuit board interconnection structure of this embodiment, through the conductive protrusion slot 210, increases the number of contact points with the conductive protrusion 320, thereby improving the electrical signal interconnection stability between the conductive protrusion 320 and the conductive contact sheet 200, that is, improving the electrical signal interconnection stability between the connector 300 and the circuit board, and improving the anti-loosening degree of the connector 300 and the circuit board.

[0051] In the embodiment, the cross section of the conductive protrusion 320 is arc-shaped; the conductive protrusion 320 abuts against the bottom wall of the conductive protrusion slot 210, and the conductive protrusion 320 abuts against one or both sides of the slot edge 211 of the conductive protrusion slot 210. When the curvature of the conductive protrusion 320 just contacts the bottom wall of the conductive protrusion slot 210 and both sides of the slot edge 211, the conductive protrusion 320 can have three point contacts or three line contacts with the conductive contact sheet 200. When the curvature of the conductive protrusion 320 is larger, the conductive protrusion 320 contacts the bottom wall of the conductive protrusion slot 210 and one side of the slot edge 211 of the conductive protrusion slot 210, and the conductive protrusion 320 can have two point contacts or two line contacts with the conductive contact sheet 200.

[0052] In the embodiment, the cross section of the conductive protrusion 320 is arc-shaped, and the conductive protrusion 320 abuts against the notch edges 211 on both sides of the conductive protrusion slot 210. When the curvature of the conductive protrusion 320 is small, the conductive protrusion 320 fails to contact the bottom wall of the conductive protrusion slot 210, but directly contacts the notch edges 211 on both sides of the conductive protrusion slot 210. At this time, the conductive protrusion 320 can also have two point contacts or two line contacts with the conductive contact sheet 200.

[0053] Specifically, when the conductive protrusion 320 contacts the notch edge 211 of the conductive protrusion slot 210, the contact tangential angle between the conductive protrusion 320 and the conductive contact sheet 200 at the notch edge 211 is E, which satisfies 30°≤E≤45°. If the contact tangential angle E is too large, the conductive protrusion 320 is easily too tightly connected to the conductive protrusion slot 210, affecting the plugging and unplugging of the circuit board. If the contact tangential angle E is too small, the clamping force of the conductive protrusion 320 on the conductive protrusion slot 210 is too small, and the effect of reducing the loosening of the circuit board is not obvious enough. After testing, when the contact tangential angle is 30°≤E≤45°, the plugging and unplugging of the circuit board is less affected, and the anti-loosening effect of the circuit board can also be significantly enhanced.

[0054] It is understandable that in some embodiments, the cross-section of the conductive protrusion 320 may also be other shapes, and those skilled in the art may configure the cross-section according to actual needs. In this case, there may be two, three, four or more contact positions between the conductive protrusion 320 and the corresponding groove wall of the conductive protrusion groove 210.

[0055] Reference Figure 5 The present invention also discloses a circuit board manufacturing method, comprising the following steps:

[0056] S10: Obtain the circuit board body 100;

[0057] S20: machining a groove 130 on the contact placement surface 120 of the plug-in board portion 110 of the circuit board body 100;

[0058] S30 : Copper plating and nickel-gold plating are performed on the contact placement surface 120 in sequence, and the copper plating layer and the nickel-gold plating layer are stacked to form a conductive contact 200 . The conductive contact 200 is partially recessed and adheres to the groove wall surface of the groove 130 to form a conductive protrusion groove 210 .

[0059] By using the above-mentioned circuit board manufacturing method, a circuit board with a conductive contact sheet 200 is manufactured, and the processing method is simple and the processability is good.

[0060] Specifically, after the contact placement surface 120 is copper plated and before the nickel-gold plated, the following steps are also included:

[0061] S40: sandblasting the copper-plated layer to roughen the surface of the copper-plated layer, which is beneficial to the bonding strength between the copper-plated layer and the nickel-gold-plated layer during the subsequent nickel-gold plating, and is also beneficial to improving the surface hardness of the conductive contact sheet 200.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A circuit board, characterized in that: include: A circuit board body (100) is provided with a plug-in board portion (110), wherein the plug-in board portion (110) has a contact placement surface (120); A plurality of conductive contact sheets (200), the conductive contact sheets (200) being in a strip shape, and all the conductive contact sheets (200) being arranged in parallel and spaced relation on the contact sheet placement surface (120) of the plug-in board portion (110); Wherein, a conductive protrusion slot (210) is provided on a side of the conductive contact sheet (200) facing away from the plug-in board portion (110).

2. The circuit board according to claim 1, characterized in that: The plug-in board part (110) is provided with a groove (130) on the contact placement surface (120); the conductive contact (200) is partially recessed and fits against the groove wall surface of the groove (130); and the partially recessed portion of the conductive contact (200) forms the conductive protrusion slot (210).

3. The circuit board according to claim 2, characterized in that: The width of the groove (130) is A, and the depth of the groove (130) is B, satisfying A / B≥1.

4. The circuit board according to claim 2, characterized in that: The thickness of the conductive contact sheet (200) is C, which satisfies 80 μm ≥ C ≥ 40 μm.

5. The circuit board according to claim 2, characterized in that: The extending direction of the groove (130) is perpendicular to the extending direction of the conductive contact sheet (200) and passes through the conductive contact sheets (200) in a row, and the conductive contact sheets (200) in a row are partially recessed and adhere to the groove wall surface of the groove (130).

6. The circuit board according to claim 2, characterized in that: The cross section of the groove (130) is rectangular, and the cross section of the conductive protrusion slot (210) is rectangular.

7. A circuit board interconnection structure, characterized in that: include: The circuit board according to any one of claims 1 to 6; A connector (300) is provided with a plug-in slot (310), a side wall of the plug-in slot (310) is provided with a plurality of conductive protrusions (320), the plug-in board portion (110) is plugged into the plug-in slot (310), the conductive protrusions (320) are correspondingly engaged with the conductive protrusion engaging slots (210), and there are at least two contact positions between the conductive protrusions (320) and the corresponding slot walls of the conductive protrusion engaging slots (210).

8. The circuit board interconnection structure according to claim 7, characterized in that: The cross section of the conductive protrusion (320) is arc-shaped; the conductive protrusion (320) abuts against the bottom wall of the conductive protrusion slot (210); and the conductive protrusion (320) abuts against one or both side notch edges (211) of the conductive protrusion slot (210).

9. The circuit board interconnection structure according to claim 7, characterized in that: The cross section of the conductive protrusion (320) is arc-shaped; the conductive protrusion (320) abuts against the notch edges (211) on both sides of the conductive protrusion slot (210).

10. A method for manufacturing a circuit board, wherein the circuit board is the circuit board according to any one of claims 1 to 6, characterized in that: The following steps are involved: Obtaining a circuit board body (100); A groove (130) is machined on the contact placement surface (120) of the plug-in board portion (110) of the circuit board body (100); Copper and nickel-gold are plated in sequence on the contact placement surface (120), the copper-plated layer and the nickel-gold-plated layer are stacked to form a conductive contact (200), and the conductive contact (200) is partially recessed and adhered to the groove wall surface of the groove (130) to form a conductive protrusion clamping groove (210).

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