Printed circuit board and printed circuit board assembly including same
By setting limiting components on the printed circuit board and using reflow soldering to install surface mount components, the problem of deflection and offset of pin connectors is solved, achieving precise installation and cost reduction.
Patent Information
- Application Number
- CN202520428485.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-12
AI Technical Summary
In the prior art, pin connectors are prone to deflection and offset after being installed on the circuit board, which leads to complex production, high cost and difficulty in controlling accuracy. Existing solutions, such as introducing fixtures, increase cost and complexity and make it difficult to guarantee long-term consistency.
Limiting components are set on the printed circuit board, and surface mount components such as resistors, capacitors, and inductors are installed by reflow soldering. The installation position and orientation of pin-type components are limited, and the surface tension during reflow soldering is used to automatically center them, ensuring accurate installation.
Simplify production processes, reduce costs, improve the installation accuracy and long-term consistency of pin-type components, and avoid the complexity and high costs brought about by the introduction of additional fixtures.
Smart Images
Figure CN223912649U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to printed circuit board technical field especially relates to a printed circuit board and printed circuit board assembly including the printed circuit board and the inserted pin type component installed on the printed circuit board, which can be installed with the inserted pin type component in the accurate position and posture. BACKGROUND
[0002] Circuit board connector as a kind of connecting board internal and external signal electrical connection component is applied on printed circuit board (PCB, sometimes also referred to as "circuit board" in this paper). According to installation mode, circuit board connector can be divided into pin welding type (THD), surface mount type (SMD), press-fit type (Press-fit) etc. Common circuit board connector has wiring terminal table, row pin, row female, small connector etc., usually by metal pin and plastic shell.
[0003] For inserted pin type connector (sometimes also referred to as "connector" in this paper), its installation on circuit board is realized by inserting one or more pins of it one by one into one or more insertion holes (such as pad hole) opened on circuit board and welding each pin in corresponding insertion hole. However, insertion hole itself has processing and batch tolerance, and the size of connector pin also has processing and batch tolerance, and the cooperation between these tolerances is difficult to guarantee that the welded connector is accurately limited. Especially, due to the tolerance existing between pin size and insertion hole inner diameter, with the torsion or push of pin in welding process (especially wave soldering commonly used when installing inserted pin type connector), the phenomenon of connector deflection and / or deviation after welding is prone to occur.
[0004] For example, Figures 1(a) to 1(c) A schematic top view showing inserted pin type connector 2 with two pins installed on printed circuit board 1, Figures 2(a) to 2(c)The schematic plan view shows a pin connector 2 with one pin installed on a printed circuit board 1. In this context, the plan view refers to the view from the side of the printed circuit board on which the connector is installed, in a direction perpendicular to the printed circuit board. Among them, Fig. 1(a) and Fig. 2(a) show the standard position and posture (in the plane of the circuit board 1, also referred to as in the horizontal direction) of the connector 2 on the circuit board 1 as originally intended. It can be seen that there is a certain gap between the pin 21 of the connector 2 and the corresponding socket 11 opened on the circuit board 1 due to the dimensional tolerance, and the twisting or pushing that may act on the connector pin during the wave soldering process causes the connector 2 to be deflected as shown in Fig. 1(b) and Fig. 2(b) and / or offset as shown in Fig. 1(c) and Fig. 2(c) after soldering. The so-called "deflection" refers to the twisting of the connector 2 relative to its intended posture, and the so-called "offset" refers to the translation of the connector 2 relative to its intended position. The deflection and / or offset of the connector 2 on the circuit board 1 not only interferes with subsequent assembly processes, leading to rework, but also seriously affects the appearance of the product and the user experience.
[0005] In order to avoid or reduce the deflection and / or offset of the connector, one existing method is to use a fixture with a limiting function in the horizontal direction during the production stage of the circuit board, and to fix the connector in position before the wave soldering process, and then to solder. However, the introduction of such a fixture causes the production process to be complex, and the amount of deflection and / or offset of the connector to be limited is relatively small (generally in the order of less than 1mm), which requires very high manufacturing and assembly requirements for such a fixture, and in actual production, such positioning process is rarely used; in addition, the limiting accuracy of the fixture will deteriorate with the long-term wear and tear and temperature shock cycle (deformation) of the fixture, and once the error of the fixture becomes large, it is difficult to monitor in real time in actual production, which requires the factory to have very high requirements for the accuracy of the fixture, which will increase the production cost; moreover, different suppliers and different batches of fixtures will have different tolerances in actual production, making it difficult to ensure long-term consistency of accurate positioning; the introduction of the fixture will also significantly increase the production installation time and the cost and maintenance cost of the fixture itself. Another solution is to reduce the inner diameter of the soldering socket of the connector, but this will directly cause the connector to be too tight or difficult to assemble, causing greater assembly problems. Utility model content
[0006] The utility model aims at solving at least one of the above problems and / or other defects in the prior art, i.e. providing a technical solution that can simply and at low cost install pin-type components such as circuit board connectors on a printed circuit board with accurate position and posture.
[0007] To achieve the above object, one aspect of the present application provides a printed circuit board, the surface of which is adapted to mount at least one pin-type component and comprises a mounting area defining a desired mounting position and posture of each pin-type component, the mounting area being provided with one or more insertion holes for one-to-one receiving one or more pins of the pin-type component. The printed circuit board comprises at least one limiting member, each limiting member being arranged at the periphery of the mounting area and being capable of at least partially limiting the deflection and / or deviation of the pin-type component by abutting against the pin-type component therein, the limiting member being a surface mount component mounted on the surface of the printed circuit board by reflow soldering.
[0008] According to an embodiment of the present application, the limiting member and the pin-type component have mutually matching profiles at the abutting positions of each other.
[0009] According to an embodiment of the present application, the printed circuit board comprises a plurality of limiting members arranged at intervals around the periphery of the mounting area to limit the deflection and / or deviation of the pin-type component therein.
[0010] According to an embodiment of the present application, the plurality of limiting members are arranged at intervals around the mounting area corresponding to the pin-type component in the shape of a rectangle in a plan view, and each limiting member has a flat surface capable of abutting against the flat outer side of the pin-type component.
[0011] According to an embodiment of the present application, the limiting member is formed by one or more surface mount components selected from the group consisting of resistors, capacitors and inductors.
[0012] Another aspect of the present application provides a printed circuit board assembly comprising the printed circuit board according to any one of the above and at least one pin-type component mounted on the printed circuit board.
[0013] According to an embodiment of the present application, the pin-type component has one or two pins.
[0014] According to an embodiment of the present application, the pin-type component is mounted on the printed circuit board by wave soldering.
[0015] According to an embodiment of the present application, the pin-type component comprises a circuit board connector.
[0016] The printed circuit board is provided with at least one limiting component around the mounting area of the pin type component, and the pin type component in the mounting area can be abutted by the limiting component to at least partially limit the deflection and / or deviation of the pin type component, wherein the limiting component is a surface mounted component mounted on the surface of the printed circuit board by reflow soldering. The surface mounted component has high mounting position precision due to the surface tension of the molten solder during reflow soldering, so that the pin type component can be kept in the accurate predetermined mounting position and posture when used as the limiting component of the pin type component, and the long-term consistency of the accurate limiting is good. For example, the surface mounted component in the form of a capacitor, a resistor, an inductor and the like is usually small in size, and basically does not affect other components of the circuit board when arranged on the circuit board, and such surface mounted component is very easy to obtain and low in cost, so that the production cost of the circuit board can be greatly reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] The features and advantages of the present application will be clearly understood through the following detailed description provided with reference to the accompanying drawings. It should be understood that the following drawings are only schematic and are not necessarily drawn to scale, and therefore should not be considered as limiting the present application, in which:
[0018] Fig. 1 (a) shows a schematic top view of a pin type connector with two pins mounted to a printed circuit board in a desired position and posture according to the prior art.
[0019] Fig. 1 (b) shows a schematic top view of the connector shown in Fig. 1 (a) after being mounted to the printed circuit board and being deflected.
[0020] Fig. 1 (c) shows a schematic top view of the connector shown in Fig. 1 (a) after being mounted to the printed circuit board and being deviated.
[0021] Fig. 2 (a) shows a schematic top view of a pin type connector with one pin mounted to a printed circuit board in a desired position and posture according to the prior art.
[0022] Fig. 2 (b) shows a schematic top view of the connector shown in Fig. 2 (a) after being mounted to the printed circuit board and being deflected.
[0023] Fig. 2 (c) shows a schematic top view of the connector shown in Fig. 2 (a) after being mounted to the printed circuit board and being deviated.
[0024] Figure 3 Fig. 3 shows a schematic top view of a pin type connector with two pins mounted to a printed circuit board according to an embodiment of the present application.
[0025] Figure 4Fig. 2 shows a schematic top view of a pin connector with one pin mounted to a printed circuit board according to another embodiment of the present utility model. DETAILED DESCRIPTION
[0026] Embodiments of the present utility model are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that the present utility model can be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order not to unnecessarily obscure the present utility model. In addition, it is to be understood that the present utility model is not limited in its application to the specific details of construction and the arrangement of components set forth in the description and / or illustrated in the drawings. The present utility model is capable of implementation in other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting. Rather, the aspects, features and embodiments of the present utility model are to be accorded the broadest possible interpretation so as to encompass any and all product, process, and other aspects.
[0027] As mentioned above, Figures 1(a) to 1(c) and Figures 2(a) to 2(c) It is schematically shown how a conventional pin connector is deflected or offset after being mounted to a printed circuit board. To solve this problem, the present utility model employs a printed circuit board which is provided with a specific limiting member for at least one target pin connector in order to improve the positional and postural accuracy of the pin connector.
[0028] In the present application, the "printed circuit board (PCB)" specifically refers to a circuit board which at least comprises the limiting member but has not yet mounted the corresponding target pin connector, and it can be either a circuit board bare substrate which has not mounted any functional component (i.e. a component for realizing various functions of the circuit board in electrical and electronic aspects, including the target pin connector), or a circuit board which has not mounted the target pin connector but has mounted at least one other functional component. In contrast, the "printed circuit board assembly (PCBA)" referred to in the present application refers to a combination of the above-mentioned printed circuit board of the present utility model and at least one target pin connector which has been mounted on the printed circuit board.
[0029] Figure 3 and Figure 4 It is schematically shown a printed circuit board 1 according to two embodiments of the present utility model, respectively, which is adapted to mount at least one pin connector 2. Figure 3 The shown embodiment is directed to a pin connector 2 with two pins 21, whereas Figure 4 The shown embodiment is directed to a pin connector 2 with one pin 21.
[0030] As Figure 3As shown, the printed circuit board 1 according to the embodiment can include a mounting area and at least one limiting member 3, the mounting area defining a desired mounting position and posture of the pin connector 2. For example, the pin connector 2 is exemplified in the embodiment as having a substantially rectangular outer profile in the top view, Figure 3 The corresponding rectangular range covered by the solid line rectangle on the circuit board 1 is the mounting area of the pin connector 2, the mounting area of the rectangle having, for example, its horizontal and vertical edges parallel to the horizontal and vertical edges of the circuit board 1 (along the X and Y directions, respectively, in Figure 3 The mounting area defines a desired mounting position and posture of the pin connector 2. Two insertion holes 11 are provided in the mounting area for receiving the two pins 21 of the pin connector 2. It can be seen that when the pin connector 2 is mounted in the desired mounting position and posture in the mounting area, each pin 21 is centrally disposed in the corresponding insertion hole 11 without deflection and without offset.
[0031] In actual operation, the setting of the mounting area can also take into account the allowable deflection and the allowable offset of the pin connector 2 in the mounting position and posture, i.e. the mounting area can be deflected within an allowable degree and offset within an allowable degree. For example, in Figure 3 In the embodiment, the rectangle shown by the dash-dot line 2" represents the mounting area after a maximum allowable deflection angle a1 in the clockwise direction, and the rectangle shown by the double dash-dot line 2' represents the mounting area after a maximum allowable offset L1 to the right. Of course, the mounting area can also be deflected in the counterclockwise direction and / or offset to the left, upward or downward by a maximum allowable offset.
[0032] Each of the at least one limiting member 3 is disposed at the periphery of the mounting area of the pin connector 2. Generally, the periphery of the pin connector is not coated within a certain distance, so the coating clearance can be used to dispose the limiting member 3. Of course, since the coating process is sprayed after the entire soldering process (reflow soldering and wave soldering) is completed, the disposition of the limiting member 3 is not affected whether or not it is coated. Even if the limiting member 3 is sprayed after the completion of the soldering process, it still does not hinder its limiting function. The specific position of the limiting member 3 is set so that it can at least partially limit the deflection or offset or both of the pin connector 2 by abutting against the pin connector 2 in the mounting area, thereby improving the mounting position and posture accuracy of the pin connector 2 on the circuit board 1.
[0033] In Figure 3In the shown embodiment, the pin connector 2 and its mounting area are substantially rectangular in a top view, having a first edge portion 22 and a second edge portion 23 opposite to each other in the X direction, and a third edge portion 24 and a fourth edge portion 25 opposite to each other in the Y direction. In this regard, four limiting members 3 are provided, which are arranged at intervals around the mounting area of the pin connector 2, one limiting member 3 being provided for each edge portion 22, 23, 24 and 25, for abutting against a respective one of the flat outer sides of the pin connector 2 (corresponding to a respective one of the edge portions of the rectangle), in order to limit the partial deflection and displacement of the pin connector 2, i.e. to limit the displacement of the pin connector 2 in the direction towards the corresponding limiting member 3 and to limit the deflection of the pin connector 2 around the corresponding limiting member 3.
[0034] Advantageously, the limiting members 3 and the pin connector 2 have mutually matching profiles at the abutment places of each other, in order to make the two as stable and secure as possible in terms of surface contact at these places, so that the deflection or displacement of the pin connector 2 at these places is reliably prevented. For example, in the embodiment shown in Figure 3 each limiting member 3 has a flat surface which can abut against one of the flat outer sides of the pin connector 2. Alternatively, if the abutment places on the outer profile of the pin connector 2 comprise curved surfaces such as arcs, the corresponding limiting member 3 can also have a curved surface of matching shape at the abutment place thereof.
[0035] In the embodiment shown in Figure 4 In another embodiment shown, the pin connector 2 has one pin 21, and correspondingly, the printed circuit board 1 is provided with one receptacle 11 in the mounting area of the pin connector 2. Compared to the embodiment shown in Figure 3 The pin connector 2 of the present embodiment tends to be more easily deflected and displaced due to having only one pin 21. Therefore, the printed circuit board 1 of the present embodiment can be provided with, for example, eight limiting members 3 arranged at intervals around the mounting area, wherein two limiting members 3 are provided for each flat outer side (corresponding to the edge portions 22, 23, 24 and 25, respectively) of the pin connector 2 which is also rectangular in a top view. The deflection of the same outer side can be more reliably prevented by the two spaced limiting members 3 abutting against the same outer side. By the cooperation of the eight limiting members 3, the displacement and the deflection angle of the pin connector 2 can be limited to L2 and a2, respectively, so as to meet the maximum allowable displacement and the maximum allowable deflection set for the mounting area.
[0036] In the utility model, the limiting component 3 is a surface mount device, and is installed on the surface of the printed circuit board 1 through reflow soldering. The surface tension of the molten solder during reflow soldering can automatically center the surface mount device, and this characteristic enables the installation of the surface mount device on the circuit board to have very high positional and attitude accuracy, thereby being able to be well used as a limiting component for limiting the pin connector. For example, under the 0402 package with a size of 1 mm x 0.5 mm, the single-side limiting accuracy of the surface mount device can reach 0.125 mm, and the maximum error of the double-side one-way theory is 0.25 mm, which is greatly lower than the double-side offset of about 1 mm in the prior art. In addition, the limiting component 3 formed by the surface mount device has good tolerance consistency, and is only dedicated to a single circuit board, and will not be worn due to repeated use, has high tolerance accuracy, and can ensure long-term consistency of accurate limiting. As an example but not limitation, the limiting component 3 can be formed by one or more industry common surface mount devices (such as resistors / capacitors / inductors with packages of 0402 / 0603 / 0805 / 1206 / 1210, etc.) of one or more of resistors, capacitors and inductors. These common surface mount devices have small volumes, basically do not have adverse effects on other devices on the circuit board, are very easy to obtain, and are extremely low in cost (such as four 0402 / 100nF capacitors only need about 1 fen of RMB), and can greatly reduce the production cost of the printed circuit board. Of course, the limiting component 3 is not limited to resistors, capacitors or inductors, but can also adopt other various forms of surface mount devices such as surface mount diodes, transistors, chips and fuses. The limiting component 3 can have or not have an electrical connection property, thereby basically not affecting the original circuit board design.
[0037] In the above embodiment, the pin connector 2 and its mounting area are shown as being substantially rectangular in the top view. However, the utility model is not limited thereto, but can be applied to the pin connector 2 with any profile. The size, shape, number and position of the limiting component 3 are also not limited to those described in the above embodiment, but can be flexibly adjusted as appropriate according to the size, profile and possible deflection and / or offset tendency of the specific target pin connector, as long as the limiting component 3 can at least partially limit the deflection and / or offset of the pin connector by abutting against the pin connector. In the above embodiment, the pin connector 2 has one or two pins, and such a pin connector 2 is more prone to deflection or offset. However, the utility model can also be applied to the pin connector with three or more pins, as long as the pin connector has a need to limit its excessive deflection and / or offset (for example, when there is a large size tolerance or gap between the pin and the socket).
[0038] In the production of the printed circuit board 1, the limiting members 3 can be arranged in a certain number and position around the periphery of the mounting area of the target pin connector 2, and each limiting member 3 is surface-mounted and soldered on the circuit board 1 by reflow soldering. Then, the target pin connector 2 is inserted and mounted on the circuit board 1. Since the limiting members 3 have been pre-installed on the circuit board 1, the target pin connector 2 is limited in the precise mounting area as soon as it is inserted and mounted on the circuit board 1, without the need to additionally introduce a limiting fixture, greatly simplifying the production process and reducing costs. Finally, the inserted and mounted target pin connector 2 is fixed in place on the circuit board 1 by using conventional wave soldering or other appropriate soldering methods (such as selective wave soldering, semi-automatic soldering, manual soldering, etc.), thereby obtaining the printed circuit board assembly according to the present application.
[0039] The above describes the embodiments of the present application by taking the pin-type circuit board connector (pin connector) as an example, but the present application is not limited thereto. Those skilled in the art can understand that the present application can also be applied to other types of pin-type components other than the circuit board connector, as long as the pin-type component has the need to limit its excessive deflection and / or deviation. Therefore, the pin connector mentioned in various places in the present application can be replaced by a pin-type component.
[0040] Various modifications and variations to the disclosed embodiments can be carried out by those skilled in the art without departing from the scope or spirit of the present application. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the present application disclosed herein. The specification and examples given should be considered exemplary only, and the true scope of the present application is indicated by the appended claims and their equivalents.
Claims
1. Printed circuit board (1) whose surface is adapted for mounting at least one pin-like component (2) and comprises a mounting area defining a desired mounting position and attitude of each pin-like component, which mounting area is provided with one or more receptacles (11) for one or more pins (21) of the pin-like component one by one, characterized in that it comprises at least one limiting member (3) arranged at the periphery of the mounting area and capable of at least partially limiting the deflection and / or displacement of the pin-like component (2) therein by abutting against it, said limiting member being a surface mounted component mounted on the surface of the printed circuit board by reflow soldering.
2. The printed circuit board (1) according to claim 1, characterized in that The limiting member (3) and the pin-like component (2) have mutually matching profiles at the abutment against each other.
3. The printed circuit board (1) according to claim 2, characterized in that The printed circuit board (1) comprises a plurality of limiting members (3) arranged at intervals around the periphery of the mounting area for limiting the deflection and / or displacement of the pin-like component (2) therein.
4. The printed circuit board (1) according to claim 3, characterized in that The plurality of limiting members (3) are arranged at intervals around the mounting area corresponding to the pin-like component (2) which is rectangular in plan view, and each limiting member has a flat surface capable of abutting against the flat outer side of the pin-like component.
5. The printed circuit board (1) according to any one of claims 1 to 4, characterized in that The limiting member (3) is formed of one or more surface mounted components of resistance, capacitance and inductance.
6. A printed circuit board assembly, characterized by Printed circuit board (1) according to any one of claims 1 to 5 and at least one pin-like component (2) mounted on the printed circuit board.
7. The printed circuit board assembly of claim 6, wherein, The pin-like component (2) has one or two pins (21).
8. The printed circuit board assembly of claim 6 or 7, wherein, The pin-like component (2) is mounted on the printed circuit board (1) by wave soldering.
9. The printed circuit board assembly of claim 6 or 7, wherein, The pin-like component (2) comprises a circuit board connector. The pin-like component (2) has one or two pins (21). The pin-like component (2) is mounted on the printed circuit board (1) by wave soldering. The pin-like component (2) comprises a circuit board connector.