A circuit board assembly and a digital key entry module

Abstract

The application discloses a circuit board assembly and a digital key entry module, comprising: a first circuit board, a first avoiding hole for avoiding a positioning column in a shell is formed in the first circuit board; a second circuit board, a positioning clamping hole for clamping with the positioning column is formed in the second circuit board, one of the first circuit board and the second circuit board is an antenna circuit board, and the other is a device circuit board; and a row of pins, pin pins of the row of pins are respectively welded on the first circuit board and the second circuit board. When assembling, the positioning column in the shell passes through the first avoiding hole of the first circuit board and is clamped in the positioning clamping hole of the second circuit board, and only the mutual fixing constraint of the second circuit board and the shell is needed, so that the problem that the welding points of the row of pins are damaged due to the fact that the first circuit board and the second circuit board both need to be clamped with the positioning column. Moreover, the mutual fixing constraint of the second circuit board and the shell can also prevent the circuit board assembly from being floated up due to the buoyancy generated during glue pouring, and the glue pouring failure risk is reduced.

Description

Technical Field

[0001] This application relates to the field of digital key technology, and more specifically, to a circuit board assembly and a digital key entry module. Background Technology

[0002] In intelligent driving vehicles, the digital key entry module is an essential component. Equipped with a Bluetooth antenna and an NFC (Near Field Communication) antenna, it enables keyless entry by swiping a mobile phone or card. The performance of the digital key entry module is determined by the NFC antenna. To ensure the performance of the NFC antenna, the digital key entry module requires a separate antenna board, separating the components and antenna into two circuit boards (one as the first circuit board and the other as the second circuit board). This necessitates the inclusion of two circuit boards within the digital key entry module.

[0003] Digital key entry modules are often located on the exterior of the cabin, such as inside the rearview mirror or A-pillar. The environment in which these modules are installed is not waterproof, thus requiring a waterproof design. However, the installation space for digital key entry modules is limited. Due to space constraints, existing solutions often employ encapsulation within the housing to waterproof the two circuit boards.

[0004] In a digital key entry module, the two circuit boards are typically connected via pin headers. These pin headers transmit the antenna signal from the first circuit board to the second circuit board. The two circuit boards are positioned using locating posts within the housing. During actual installation, the first circuit board is first assembled into the housing, constrained by the locating posts, and pin headers are soldered onto it. Then, the second circuit board is assembled, and pin headers are soldered to it within the housing. In this assembly configuration, the second circuit board is constrained by both the locating posts and the pin headers within the housing.

[0005] The existing assembly method requires soldering a second circuit board inside the housing. The soldering accuracy of the second circuit board is greatly affected by the size of the housing. If there is an error in the size of the housing, the pins of the pin header may not be aligned with the solder joints on the second circuit board after it is constrained to the positioning posts inside the housing. This will result in soldering stress, which may lead to poor soldering or even product failure.

[0006] Therefore, how to avoid welding defects and product failures caused by welding stress is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] In view of this, the purpose of this application is to provide a circuit board assembly to avoid poor soldering and product failure caused by soldering stress;

[0008] Another objective of this application is to provide a digital key entry module having the aforementioned circuit board assembly.

[0009] To achieve the above objectives, this application provides the following technical solution:

[0010] The first aspect of this application provides a circuit board assembly for mounting inside the housing of a digital key entry module, comprising:

[0011] A first circuit board, wherein a first clearance hole is provided on the first circuit board, the first clearance hole being used to avoid the positioning post inside the housing;

[0012] The second circuit board has a positioning snap-fit ​​hole for engaging with the positioning post. One of the first circuit board and the second circuit board is an antenna circuit board, and the other is a device circuit board.

[0013] The pin header has pins soldered to the first circuit board and the second circuit board, respectively.

[0014] In one possible implementation, there are at least two pin headers, which are spaced apart between the first circuit board and the second circuit board.

[0015] In one possible implementation, the pin header includes a pin header base and two pins fixed to the pin header base, with the two pins located at opposite ends of the pin header base.

[0016] And / or,

[0017] Each of the aforementioned pin headers is arranged in parallel.

[0018] In one possible implementation, there are at least two first clearance holes, and two of the first clearance holes are distributed on one of the diagonals of the first circuit board, or at a predetermined distance from one of the diagonals of the first circuit board.

[0019] In one possible implementation, a first vent hole is also provided on the first circuit board;

[0020] And / or,

[0021] The second circuit board also has a second vent hole;

[0022] And / or,

[0023] The first clearance hole and the positioning snap hole are arranged in a one-to-one correspondence, and the diameter of the first clearance hole is larger than the diameter of the positioning snap hole.

[0024] The circuit board assembly provided in this application has a first clearance hole on the first circuit board to avoid the positioning post inside the housing. This means that when the circuit board assembly is assembled into the housing, the first circuit board is not fixed to the housing via the positioning post. The second circuit board has a positioning engagement hole for engaging with the positioning post of the housing. This means the circuit board assembly is positioned solely by engaging the positioning post of the housing via the second circuit board. During the assembly of the digital key entry module, the first circuit board, the second circuit board, and the pin header can be soldered outside the housing to form the circuit board assembly. The entire circuit board assembly is then assembled inside the housing. Because the pin header is soldered outside the housing, the soldering is not affected by the positional accuracy of the positioning post, thus avoiding soldering defects and product failures caused by soldering stress. During assembly, the positioning post inside the housing passes through the first clearance hole on the first circuit board and engages with the positioning engagement hole on the second circuit board. Only the mutual fixation between the second circuit board and the housing prevents damage to the pin header solder joints caused by the need for both the first and second circuit boards to engage with the positioning post. Furthermore, the mutual fixation and constraint between the second circuit board and the housing can prevent the buoyancy generated during potting from lifting the circuit board assembly, thus reducing the risk of potting failure.

[0025] A second aspect of this application provides a digital key access module, comprising:

[0026] The housing has positioning posts on its bottom wall;

[0027] The circuit board assembly is as described in any of the preceding claims, wherein the first clearance hole is fitted onto the positioning post, and the positioning snap hole is snapped onto the positioning post;

[0028] A potting compound is filled into the housing.

[0029] In one possible implementation, a support column is also provided on the bottom wall of the housing;

[0030] The first circuit board is also provided with a second clearance hole, which is used to avoid the support column inside the housing;

[0031] The support column abuts against the side of the second circuit board facing the first circuit board.

[0032] In one possible implementation, there are at least two support columns, with two of the support columns and two of the positioning columns located at the four vertices of the quadrilateral.

[0033] In one possible implementation, the positioning post is a mushroom-shaped elastic positioning post.

[0034] In one possible implementation, the maximum outer diameter of the mushroom head of the mushroom-shaped elastic positioning post is 3.5mm-4.5mm;

[0035] The diameters of the first clearance hole and the second clearance hole are 5mm-9mm;

[0036] The diameter of the positioning snap hole is 3mm-4mm, and is smaller than the maximum outer diameter of the mushroom head of the mushroom head elastic positioning post.

[0037] The digital key entry module provided in this application has all the technical effects of the aforementioned circuit board assembly, which will not be elaborated further here. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is an exploded view of the digital key entry module disclosed in an embodiment of this application;

[0040] Figure 2 This is a schematic diagram of the structure of the digital key entry module disclosed in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram of the shell structure disclosed in the embodiments of this application;

[0042] Figure 4 This is a schematic diagram of the structure of the first circuit board disclosed in an embodiment of this application;

[0043] Figure 5 This is a schematic diagram of the structure of the second circuit board disclosed in an embodiment of this application;

[0044] Figure 6 This is a schematic diagram of the circuit board assembly disclosed in the embodiments of this application;

[0045] Figure 7 This is a schematic diagram of the pin header structure disclosed in an embodiment of this application.

[0046] The meanings of the various reference numerals in the figure are as follows:

[0047] 100 - First circuit board; 101 - First clearance hole; 102 - Second clearance hole; 103 - First vent hole;

[0048] 200 - Second circuit board; 201 - Positioning clip hole; 202 - Second vent hole;

[0049] 300 - Pin header; 301 - Pin header base; 302 - Pin;

[0050] 400 - Housing; 401 - Positioning post; 402 - Support post;

[0051] 500 - Potting colloid. Detailed Implementation

[0052] The core of this application is to provide a circuit board assembly to avoid poor soldering and product failure caused by soldering stress;

[0053] Another core aspect of this application is to provide a digital key entry module having the aforementioned circuit board assembly.

[0054] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the application as described in the claims. Additionally, the complete composition represented in the embodiments below is not limited to what is necessary as the solution to the application described in the claims. It should be noted that, for ease of description, only the parts relevant to the application are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0055] like Figure 1 and Figure 2 As shown in the embodiment of this application, the circuit board assembly is used to be installed into the housing 400 of the digital key entry module. The circuit board assembly includes a first circuit board 100, a second circuit board 200, and a pin header 300.

[0056] like Figure 3 and Figure 4As shown, the first circuit board 100 has a first clearance hole 101, which is used to avoid the positioning post 401 inside the housing 400. That is, the first circuit board 100 needs to have the first clearance hole 101 at a position corresponding to the positioning post 401 of the housing 400. The size of the first clearance hole 101 should be large enough to cover the positioning post 401, ensuring that the first circuit board 100 will not interfere with the positioning post 401 during circuit board assembly installation, i.e., the first circuit board 100 and the positioning post 401 will not have a mutually fixing effect. Those skilled in the art will understand that, in order to ensure the installation depth of the circuit board assembly within the housing 400, if the housing 400 has other structures that may interfere with the first circuit board 100, then the first circuit board 100 also needs to have corresponding clearance holes at the corresponding positions.

[0057] like Figure 5 and Figure 6 As shown, the second circuit board 200 has a positioning snap-fit ​​hole 201, which is used to snap into the positioning post 401. That is, the second circuit board 200 needs to have the positioning snap-fit ​​hole 201 at a position corresponding to the positioning post 401 of the housing 400. The size of the positioning snap-fit ​​hole 201 allows for a snap-fit ​​action with the positioning post 401, ensuring that the second circuit board 200 is fixed to the positioning post 401 during circuit board assembly installation. It should be noted that the shape and structure of the positioning snap-fit ​​hole 201 should be determined by the structure type of the positioning post 401. As long as the two can achieve mutual fixation, they can constrain the circuit board assembly and prevent the circuit board assembly from floating during potting.

[0058] Furthermore, it should be noted that one of the first circuit board 100 and the second circuit board 200 is an antenna circuit board, and the other is a device circuit board. This application does not limit the location of the first clearance hole 101 on any particular circuit board; it can be located on either the antenna circuit board or the device circuit board. Considering that there are many components on the device circuit board, fixing the device circuit board makes it easier to ensure the overall stability of the circuit board assembly. Therefore, in this embodiment, the first circuit board 100 can be used as the antenna circuit board, and the second circuit board 200 as the device circuit board.

[0059] It is important to emphasize that during the installation of the circuit board assembly, the first circuit board 100 with the first clearance hole 101 is positioned close to the bottom wall of the housing 400 (the positioning post 401 is located on the bottom wall of the housing 400). This arrangement allows the constraint points between the circuit board assembly and the housing 400 to be positioned away from the bottom wall of the housing, ensuring that the center of gravity of the circuit board assembly is below its fixing point. This provides greater stability during potting and prevents the circuit board assembly from moving during potting.

[0060] like Figure 4and Figure 7 As shown, the pins of the pin header 300 are soldered to the first circuit board 100 and the second circuit board 200, respectively. Specifically, the pins at the tail of the pin header 300 can be wave soldered to the first circuit board 100 with the assistance of a soldering fixture, and the pins at the head of the pin header 300 can be robotically soldered to the second circuit board 200 with the assistance of a soldering fixture. After the pins at both ends of the pin header 300 are soldered, the first circuit board 100 and the second circuit board 200 are fixed into a single unit.

[0061] Since only the second circuit board 200 is constrained within the housing 400 by the positioning post 401, while the first circuit board 100 is not constrained by the positioning post 401, the position of the first circuit board 100 within the housing 400 is constrained by the pin header 300. That is, the first circuit board 100 is fixed to the second circuit board 200 by the pin header 300, thereby achieving the fixation of the first circuit board 100 within the housing 400.

[0062] To improve the support effect of the pin headers 300 on the first circuit board 100, at least two pin headers 300 may be provided, and they may be arranged at intervals between the first circuit board 100 and the second circuit board 200. Those skilled in the art will understand that, without being constrained by the components on the first circuit board 100 and the second circuit board 200, maximizing the distance between the pin headers 300 will yield a better support effect. Furthermore, arranging the pin headers 300 in parallel can also provide a more balanced support force.

[0063] The pin header 300 includes a pin header base 301 and two pins 302 fixed on the pin header base 301. The two pins 302 are located at opposite ends of the pin header base 301. Specifically, the pins 302 in the middle of the pin header base 301 of each pin header 300 can be removed, leaving the two pins 302 at the ends. This allows for a larger span between the two pins 302, which can also provide good support for the first circuit board 100.

[0064] In summary, the circuit board assembly disclosed in this application has a first clearance hole 101 on the first circuit board 100 to avoid the positioning post 401 inside the housing 400. This means that when the circuit board assembly is assembled into the housing 400, the first circuit board 100 is not fixed to the housing 400 via the positioning post 401. The second circuit board 200 has a positioning engagement hole 201 for engaging with the positioning post 401 of the housing 400. This means the circuit board assembly is positioned by engaging with the positioning post 401 of the housing 400 only through the second circuit board 200.

[0065] During the assembly of the digital key entry module, the first circuit board 100, the second circuit board 200, and the pin header 300 can be soldered on the outside of the housing 400 to form the circuit board assembly. The circuit board assembly is then assembled into the housing 400. Since the pin header 300 is soldered on the outside of the housing 400, the soldering is not affected by the positional accuracy of the positioning post 401, thus avoiding soldering defects and product failures caused by soldering stress.

[0066] During assembly, the positioning pin 401 inside the housing 400 passes through the first clearance hole 101 of the first circuit board 100 and is secured within the positioning engagement hole 201 of the second circuit board 200. Only through the mutual fixing constraint between the second circuit board 200 and the housing 400, the solder joints of the pin header 300 are not damaged due to stress caused by both the first and second circuit boards needing to engage with the positioning pin 401. Furthermore, the mutual fixing constraint between the second circuit board 200 and the housing 400 also prevents the buoyancy generated during potting from lifting the circuit board assembly, reducing the risk of potting failure.

[0067] To improve the constraint effect on the circuit board assembly, at least two positioning posts 401 are typically provided on the bottom wall of the housing 400. Therefore, there are at least two first clearance holes 101, and two of the first clearance holes 101 are distributed on one of the diagonals of the first circuit board 100. Arranging two of the first clearance holes 101 on one of the diagonals of the first circuit board 100 allows for a greater distance between the two first clearance holes 101. This arrangement enables the positioning posts 401 at the corresponding positions to provide a more stable constraint effect on the circuit board assembly.

[0068] It should be noted that the two first clearance holes 101 can also be spaced at a predetermined distance from one of the diagonals of the first circuit board 100. That is, the first clearance holes 101 are allowed to deviate from one of the diagonals of the first circuit board 100. As long as they are close to the diagonal, it can still be ensured that the two first clearance holes 101 have sufficient distance to improve the support effect.

[0069] Those skilled in the art will understand that air bubbles are generated during the potting process, which reduces the sealing effect of the potting adhesive. Therefore, in this embodiment, a first vent hole 103 is also provided on the first circuit board 100. The first vent hole 103 is not limited to one; without affecting the circuitry on the first circuit board 100, multiple locations on the first circuit board 103 can be arranged as needed to improve the venting effect.

[0070] Correspondingly, a second exhaust hole 202 is provided on the second circuit board 200. The second exhaust hole 202 is not limited to one. Without affecting the circuit on the second circuit board 200, the second exhaust hole 202 can be arranged at multiple positions on the second circuit board 200 as needed to improve the exhaust effect.

[0071] In a specific embodiment of this application, the first clearance hole 101 and the positioning snap-fit ​​hole 201 are arranged in a one-to-one correspondence, and the diameter of the first clearance hole 101 is larger than the diameter of the positioning snap-fit ​​hole 201. It should be noted that the shape of the positioning snap-fit ​​hole 201 should be set according to the shape of the positioning post 401, and is not limited to a circle. Since the function of the first clearance hole 101 is to avoid interference with the positioning post 401, it only needs to be able to avoid the positioning post 401, and its shape is not affected by the shape of the positioning post 401. The shape of the first clearance hole 101 can be set according to requirements and is not limited to a circle.

[0072] When both the first clearance hole 101 and the positioning snap-fit ​​hole 201 are circular, they can be arranged coaxially or eccentrically, as long as the first clearance hole 101 can avoid the positioning post 401 and the positioning snap-fit ​​hole 201 can snap into the positioning post 401.

[0073] like Figure 1 and Figure 2 As shown in the figure, this application embodiment also discloses a digital key entry module, which includes a housing 400, a circuit board assembly, and a potting compound 500. Positioning posts 401 are provided on the bottom wall of the housing 400. Those skilled in the art will understand that the number and position of the positioning posts 401 can be set according to product requirements.

[0074] The circuit board assembly is the circuit board assembly disclosed in the above embodiment. The first clearance hole 101 is fitted onto the positioning post 401 with a gap, and the positioning snap-fit ​​hole 201 is snapped onto the positioning post 401. There is a gap between the positioning post 401 and the inner wall of the first clearance hole 101, that is, the positioning post 401 will not contact the first clearance hole 101, that is, the first circuit board 100 will not be constrained by the positioning post 401. The potting compound 500 is potted into the housing 400 to seal the circuit board assembly inside the housing 400, thereby achieving a sealing and waterproof effect.

[0075] The digital key entry module disclosed in this application has all the technical effects of the circuit board assembly described above, and will not be repeated here.

[0076] To improve the constraint effect of the housing 400 on the circuit board assembly, such as Figure 3As shown, in this embodiment, a support column 402 is also provided on the bottom wall of the housing 400. The support column 402 is used to support the second circuit board 200. That is, the support column 402 abuts against the side of the second circuit board 200 facing the first circuit board 100. For example, the positioning snap-fit ​​hole 201 and the positioning column 401 can restrict the movement of the circuit board assembly away from the bottom wall of the housing, while the support column 402 abuts against the side of the second circuit board 200 facing the first circuit board 100 can restrict the movement of the circuit board assembly towards the bottom wall of the housing. In this way, the movement of the circuit board assembly in two directions within the housing 400 can be realized, improving the support stability of the circuit board assembly.

[0077] It will be understood by those skilled in the art that, as Figure 4 As shown, the first circuit board 100 is also provided with a second clearance hole 102, which is used to avoid the support column 402 inside the housing 400. That is, the first circuit board 100 needs to have the second clearance hole 102 at a position corresponding to the support column 402 of the housing 400. The size of the second clearance hole 102 should be large enough to cover the support column 402, so as to ensure that the first circuit board 100 will not interfere with the support column 402 when the circuit board assembly is installed, that is, the first circuit board 100 and the support column 402 will not have a mutual fixing effect.

[0078] Furthermore, there are at least two support pillars 402, with two support pillars 402 and two positioning pillars 401 located at the four vertices of the quadrilateral. Taking an example where there are two support pillars 402 and two positioning pillars 401, the two support pillars 402 and two positioning pillars 401 are arranged at the four vertices of the quadrilateral, with the two support pillars 402 located at one pair of opposite diagonal vertices and the corresponding two positioning pillars 401 located at the other pair of opposite diagonal vertices. This arrangement allows for a more balanced distribution of the support pillars 402 and positioning pillars 401, resulting in a more balanced upward support force (provided by the support pillars 402) and downward support force (provided by the positioning pillars 401) for the circuit board assembly.

[0079] In existing technologies, pressure ribs are generally set on positioning posts to constrain the circuit board and prevent it from floating up due to the glue. The dimensional accuracy of the pressure ribs is very high, and crimping equipment is required during assembly to ensure that the circuit board is crimped in place. Otherwise, it will cause glue problems, such as the components on the circuit board not being properly covered by the glue.

[0080] Based on this, in a specific embodiment of this application, the positioning post 401 is a mushroom-head elastic positioning post. Those skilled in the art will understand that the mushroom-head elastic positioning post has a deformation gap in the middle, dividing it into two parts. For ease of understanding, these two parts are defined as a first mushroom-head positioning body and a second mushroom-head positioning body, respectively. The deformation gap between the first and second mushroom-head positioning bodies allows them to approach each other under external force.

[0081] The heads of the first and second mushroom-head positioning bodies are half-mushroom-head structures. When the positioning post 401 engages with the positioning latching hole 201, the mushroom-head structure acts as a guide, causing the first and second mushroom-head positioning bodies to move closer together until they engage with the positioning latching hole 201. Finally, the mushroom heads of the first and second mushroom-head positioning bodies pass through the positioning latching hole 201, and then, under elastic action, the two mushroom-head structures reset, thus limiting the first circuit board 100 and preventing it from detaching upwards from the mushroom-head elastic positioning post. Compared to the clamping method of the press-fit ribs, the mushroom-head elastic positioning post utilizes elastic deformation and the mushroom heads at the ends for clamping, requiring less precision and avoiding incomplete crimping.

[0082] In a specific embodiment of this application, the maximum outer diameter of the mushroom head of the mushroom-shaped elastic positioning post is 3.5mm-4.5mm, for example, the maximum outer diameter of the mushroom head is 4.1mm; the diameter of the first clearance hole 101 and the second clearance hole 102 is 5mm-9mm, for example, the diameter of the first clearance hole 101 and the second clearance hole 102 is 7mm; the diameter of the positioning snap hole 201 is 3mm-4mm, and is smaller than the maximum outer diameter of the mushroom head of the mushroom-shaped elastic positioning post, for example, the diameter of the positioning snap hole 201 is 3.7mm.

[0083] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0084] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0085] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0086] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A circuit board assembly for mounting into a housing (400) of a digital key entry module, characterized by, include: A first circuit board (100) is provided with a first clearance hole (101), which is used to avoid the positioning post (401) inside the housing (400). The second circuit board (200) has a positioning snap-fit ​​hole (201) on it. The positioning snap-fit ​​hole (201) is used to snap-fit ​​with the positioning post (401). One of the first circuit board (100) and the second circuit board (200) is an antenna circuit board, and the other is a device circuit board. The pin header (300) has pins soldered to the first circuit board (100) and the second circuit board (200), respectively.

2. The circuit board assembly of claim 1, wherein, There are at least two pin headers (300), which are spaced apart between the first circuit board (100) and the second circuit board (200).

3. The circuit board assembly of claim 2, wherein, The pin header (300) includes a pin header seat (301) and two pins (302) fixed on the pin header seat (301), with the two pins (302) located at opposite ends of the pin header seat (301). And / or, Each of the aforementioned pin headers (300) is arranged in parallel.

4. The circuit board assembly as claimed in claim 1, characterized in that, There are at least two first clearance holes (101), and two of the first clearance holes (101) are distributed on one of the diagonals of the first circuit board (100), or at a predetermined distance from one of the diagonals of the first circuit board (100).

5. The circuit board assembly as described in any one of claims 1-4, characterized in that, The first circuit board (100) is also provided with a first exhaust hole (103); And / or, The second circuit board (200) is also provided with a second vent (202); And / or, The first clearance hole (101) and the positioning snap hole (201) are arranged in a one-to-one correspondence, and the diameter of the first clearance hole (101) is larger than the diameter of the positioning snap hole (201).

6. A digital key entry module, characterized in that, include: The housing (400) has a positioning post (401) on its bottom wall. The circuit board assembly is the circuit board assembly as described in any one of claims 1-5, wherein the first clearance hole (101) is sleeved on the positioning post (401) with a gap, and the positioning snap hole (201) is snapped onto the positioning post (401); A potting compound (500) is potted into the housing (400).

7. The digital key entry module as described in claim 6, characterized in that, A support column (402) is also provided on the bottom wall of the housing (400). The first circuit board (100) is also provided with a second clearance hole (102), which is used to avoid the support column (402) inside the housing (400). The support column (402) abuts against the side of the second circuit board (200) facing the first circuit board (100).

8. The digital key entry module as described in claim 7, characterized in that, There are at least two support columns (402), wherein two of the support columns (402) and two of the positioning columns (401) are located at the four vertices of the quadrilateral.

9. The digital key entry module as described in claim 7, characterized in that, The positioning post (401) is a mushroom-shaped elastic positioning post.

10. The digital key entry module as described in claim 9, characterized in that, The maximum outer diameter of the mushroom head of the mushroom-shaped elastic positioning post is 3.5mm-4.5mm; The diameters of the first clearance hole (101) and the second clearance hole (102) are 5mm-9mm; The diameter of the positioning snap hole (201) is 3mm-4mm, and is smaller than the maximum outer diameter of the mushroom head of the mushroom head elastic positioning post.

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