Printed circuit board pressing device and electronic equipment

Abstract

The utility model discloses a printed circuit board pressing device and electronic equipment. The printed circuit board pressing device comprises an attachment base body; the elastic pressing body is arranged on the attachment base body, the elastic pressing body comprises an elastic rib body and a pressing connection protrusion, a deformation gap is formed between the elastic rib body and the attachment base body, and the pressing connection protrusion is arranged on the side, back to the deformation gap, of the elastic rib body. According to the utility model, metal screws are not required to fix the printed circuit board, so that the radio frequency effect of the antenna is not influenced, and compared with the fixing mode of crushing ribs, the crimping bulges are arranged on the elastic rib bodies, so that the requirement on the dimensional accuracy of the crimping bulges can be reduced by utilizing elastic deformation, and the problem of poor dimensional accuracy is avoided; and the problem that the fixation cannot be performed or is insufficient is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic products, in particular to a printed circuit board pressing device and electronic equipment. Background Art

[0002] In many electronic products, PCBA (Printed Circuit Board Assembly, the entire process of PCB blank board after SMT mounting, or DIP plug-in, referred to as PCBA) needs to be fixed in the shell. Figure 1 As shown, a common fixing method in the prior art is to fix PCBA01 in the housing by metal screws 02. Figure 2 As shown, another common fixing method is to set a crushing rib 04 on the cover plate 03 of the housing. The PCBA is fixed in the X and Y directions by the positioning columns and in the Z direction by the crushing rib 04.

[0003] Regarding the method of fixing PCBA with metal screws, in order to fix the PCBA securely, the metal screws are usually evenly arranged on the PCBA (four corners and the middle area). In addition, there are higher requirements for the fixing method of antenna and RF products. In addition to the need to fix the PCBA securely to meet the vibration and impact standards of the automotive industry, it is also necessary to ensure that the position of the metal screws does not interfere with the antenna signal to avoid affecting the antenna RF effect. In addition, the metal screw fixing method requires the addition of metal screw materials and screw driving processes, which is costly and requires many installation steps. In addition, the signals of antenna and RF products are more sensitive to metal. When the PCBA is fixed with metal screws, the antenna area needs to be avoided. This places high demands on the design of the antenna and the arrangement of the screws. Under certain working conditions, it may not be possible to simultaneously ensure antenna performance and meet the requirements of uniform screw arrangement.

[0004] The method of fixing PCBA with crushing ribs has certain requirements on the material of the shell. It is mostly used for some materials with good toughness (such as nylon, etc.). For some hard plastic materials, the crushing ribs are very rigid and difficult to crush. Forcing the assembly will cause deformation of the shell and stress concentration, resulting in shell cracking. On the other hand, the crushing amount of the crushing ribs is designed to be very small, generally 0.1-0.2mm, which is difficult to control and has high requirements for dimensional accuracy. A slight change in dimensional tolerance may result in a large crushing amount and inability to assemble, or a small crushing amount, resulting in insufficient fixation of the PCBA.

[0005] Therefore, how to ensure that the printed circuit board is reliably fixed without affecting the radio frequency effect of the antenna is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a printed circuit board pressing device to ensure that the printed circuit board is reliably fixed while not affecting the antenna radio frequency effect;

[0007] Another object of the utility model is to provide an electronic device having the printed circuit board pressing device.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A printed circuit board pressing device, comprising:

[0010] Adhesion substrate;

[0011] An elastic pressing body is arranged on the attachment substrate, and comprises an elastic rib and a crimping protrusion. A deformation gap is provided between the elastic rib and the attachment substrate, and the crimping protrusion is arranged on a side of the elastic rib facing away from the deformation gap.

[0012] Optionally, in the above-mentioned printed circuit board pressing device,

[0013] It also includes a positioning rib connected between two adjacent elastic ribs, wherein the positioning rib is disposed on the attachment substrate;

[0014] The two ends of the elastic ribs are connected to the attachment base through supporting ribs, the positioning ribs are connected to the supporting ribs, and the elastic ribs protrude from a side of the positioning ribs away from the attachment base.

[0015] Optionally, in the above-mentioned printed circuit board pressing device, the elastic pressing body is provided in the edge area and / or the middle area of ​​the attachment substrate.

[0016] Optionally, in the above-mentioned printed circuit board pressing device, the bodies are evenly arranged in the edge area of ​​the attachment substrate.

[0017] Optionally, in the above-mentioned printed circuit board pressing device, the attachment base is a polygonal structure, and each side of the attachment base is provided with at least one elastic pressing body.

[0018] Optionally, in the above-mentioned printed circuit board pressing device, a plurality of the elastic pressing bodies are provided in the middle area of ​​the attachment base, and each of the elastic pressing bodies is evenly arranged in the middle area of ​​the attachment base.

[0019] Optionally, in the above-mentioned printed circuit board pressing device, the elastic pressing bodies located in the middle area of ​​the attachment substrate include at least a first group of elastic pressing bodies and a second group of elastic pressing bodies, and the first group of elastic pressing bodies and the second group of elastic pressing bodies are arranged crosswise.

[0020] Optionally, in the above-mentioned printed circuit board pressing device, the surface of the crimping protrusion facing away from the elastic rib is a curved surface or a flat surface.

[0021] Optionally, in the above-mentioned printed circuit board pressing device, the edge of the attachment base is provided with an outer folded edge, the elastic pressing body is arranged on the inner side of the outer folded edge, and the side of the outer folded edge facing the elastic pressing body is provided with a buckle for being snapped onto the electronic device housing.

[0022] The utility model provides a printed circuit board clamping device, in which an elastic clamping body is arranged on an attachment substrate, and the elastic clamping body includes an elastic rib and a crimping protrusion, and a deformation gap is provided between the elastic rib and the attachment substrate. When the printed circuit board clamping device is fixed on the housing of an electronic device, the elastic rib will correspond to the printed circuit board, and the crimping protrusion will force the elastic rib to deform in the direction of the deformation gap under the action of mutual squeezing with the printed circuit board. The deformed elastic rib generates an elastic force acting on the printed circuit board, and then the printed circuit board is compressed, which can ensure that the printed circuit board will not shake, and meet the vibration and impact requirements of the automotive industry. Moreover, the utility model does not need metal screws to fix the printed circuit board, so it will not affect the radio frequency effect of the antenna. Compared with the fixing method of the crushing rib, because the crimping protrusion is arranged on the elastic rib, elastic deformation can be used to reduce the dimensional accuracy requirements of the crimping protrusion, thereby avoiding the problem of being unable to fix or insufficiently fixed due to dimensional accuracy problems.

[0023] An electronic device, comprising:

[0024] Electronic equipment housing;

[0025] A printed circuit board is arranged on the housing of the electronic device;

[0026] The printed circuit board pressing device is arranged on the electronic equipment housing to press the printed circuit board. The printed circuit board pressing device is the printed circuit board pressing device as described in any one of the above items.

[0027] The electronic device provided by the utility model has the above-mentioned printed circuit board pressing device, and therefore has all the technical effects of the above-mentioned printed circuit board pressing device, which will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the structure of fixing a printed circuit board by metal screws disclosed in the prior art;

[0030] Figure 2 It is a schematic diagram of the structure of fixing a printed circuit board by means of compression ribs disclosed in the prior art;

[0031] Figure 3 A schematic diagram of the structure of a printed circuit board pressing device provided by an embodiment of the utility model;

[0032] Figure 4 A top view of a printed circuit board pressing device provided by an embodiment of the utility model;

[0033] Figure 5 for Figure 4 Section view along line AA;

[0034] Figure 6 A top view of an electronic device provided by an embodiment of the utility model;

[0035] Figure 7 for Figure 6 Sectional view along line BB;

[0036] Figure 8 A schematic structural diagram of a printed circuit board pressing device provided by another embodiment of the utility model;

[0037] Fig. 9 A schematic structural diagram of a printed circuit board pressing device provided in yet another embodiment of the present invention.

[0038] The meanings of the reference numerals in the figures are as follows:

[0039] 01-PCBA; 02-metal screws; 03-cover plate; 04-compression ribs;

[0040] 100-printed circuit board clamping device; 101-positioning ribs; 102-elastic ribs; 103-crimping protrusions; 104-deformation gap; 105-outer folding edge; 106-attachment base; 107-buckle; 108-support ribs;

[0041] 200-Electronic equipment housing;

[0042] 300-Printed circuit board. DETAILED DESCRIPTION

[0043] The core of the utility model is to provide a printed circuit board pressing device, so as to ensure that the printed circuit board is reliably fixed without affecting the antenna radio frequency effect;

[0044] Another core of the utility model is to provide an electronic device having the printed circuit board pressing device.

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] like Figure 3-Figure 5 As shown, an embodiment of the utility model discloses a printed circuit board clamping device, which is used to fix the printed circuit board by clamping, so as to avoid the problems caused by fixing by metal screws and crushing ribs in the prior art.

[0047] The printed circuit board pressing device disclosed in the embodiment of the utility model comprises an attachment base 106 and an elastic pressing body. The attachment base 106 is used as a setting base of the elastic pressing body and can be a cover body fixed on the housing of the electronic device.

[0048] Please combine Figure 6 and Figure 7 The elastic pressing body is arranged on the attachment base 106. Specifically, the elastic pressing body can be formed into an integral structure by injection molding with the attachment base 106. The height of the elastic pressing body protruding from the attachment base 106 can be designed according to the position of the printed circuit board 300 in the electronic device housing 200. If the printed circuit board 300 is located at a lower position, a step can be added between the bottom of the elastic pressing body and the attachment base 106 to raise the elastic pressing body to a certain height.

[0049] In this embodiment, the elastic pressing body includes an elastic rib 102 and a crimping protrusion 103. A deformation gap 104 is provided between the elastic rib 102 and the attachment substrate 106. The crimping protrusion 103 is disposed on the side of the elastic rib 102 that is opposite to the deformation gap 104. The crimping protrusion 103 protrudes from the elastic rib 102 and is used to contact the printed circuit board 300, making it easier to apply the elastic force generated by the deformation of the elastic rib 102 to the printed circuit board 300.

[0050] The surface of the crimping protrusion 103 facing away from the elastic tendon 102 can be a curved surface or a flat surface. Specifically, the cross-section of the crimping protrusion 103 can be circular, square, triangular, trapezoidal, etc. The utility model does not limit the specific shape of the crimping protrusion 103.

[0051] It can be understood by those skilled in the art that the longer the elastic rib 102 is, the greater its flexibility and the easier it is to deform, that is, the smaller the pressing force applied to the printed circuit board 300 is; the greater the thickness / width of the elastic rib 102 is, the greater its rigidity is, that is, the greater the pressing force applied to the printed circuit board 300 is. The crimping protrusion 103 can be set in the middle of the elastic rib 102, the purpose of which is to contact the printed circuit board 300 and press it. The utility model can adjust the parameters such as the length, width, thickness of the elastic rib 102 structure and the size of the crimping protrusion 103, and adjust the pressing force of the printed circuit board 300 through simulation calculation.

[0052] The deformation gap 104 is a gap between the attachment substrate 106 and the elastic tendon 102, and its function is to provide deformation space for the elastic tendon 102. The size of the deformation gap 104 can be designed according to actual requirements. Figure 7 As shown, when the elastic pressing body presses the printed circuit board 300, the crimping protrusion 103 is stressed, and the elastic rib 102 undergoes elastic deformation, bending toward one side of the attachment substrate 106 like a bow rope, and the elastic deformation generates elastic force to press the printed circuit board 300.

[0053] The width of the deformation gap 104 should be greater than the deformation of the elastic ribs 102 to prevent the elastic ribs 102 from directly contacting the attachment substrate 106 after the printed circuit board clamping device is installed, thereby preventing the optimal elastic force from being generated. The minimum clamping force required for the printed circuit board 300 can be calculated by impact acceleration. According to Newton's second law, the resultant force F of each elastic rib 102 is greater than the minimum clamping force required for the printed circuit board 300, which can ensure that the printed circuit board 300 will not shake and meet the vibration and impact requirements of the automotive industry.

[0054] In summary, the printed circuit board pressing device 100 provided by the utility model is provided with an elastic pressing body on the attachment substrate 106, and the elastic pressing body includes an elastic rib 102 and a crimping protrusion 103, and a deformation gap 104 is provided between the elastic rib 102 and the attachment substrate 106. When the printed circuit board pressing device 100 is fixed on the electronic device housing 200, the elastic rib 102 will correspond to the printed circuit board 300, and the crimping protrusion 103 will force the elastic rib 102 to deform in the direction of the deformation gap 104 under the action of mutual compression with the printed circuit board 300. The deformed elastic rib 102 generates an elastic force acting on the printed circuit board 300, and then the printed circuit board 300 is pressed, which can ensure that the printed circuit board 300 will not shake, and meet the vibration and impact requirements of the automotive industry. Moreover, the utility model does not need metal screws to fix the printed circuit board 300, so it will not affect the antenna radio frequency effect. Compared with the fixing method of the crushed ribs, because the crimping protrusion 103 is set on the elastic rib body 102, elastic deformation can be used to reduce the dimensional accuracy requirements of the crimping protrusion 103, thereby avoiding the problem of inability to fix or insufficient fixation due to dimensional accuracy problems.

[0055] In order to improve the fixing strength of the elastic ribs 102, in a specific embodiment of the utility model, the printed circuit board clamping device 100 may also include a positioning rib 101 connected between two adjacent elastic ribs 102, the positioning rib 101 is arranged on the attachment base 106, the two ends of the elastic rib 102 are connected to the attachment base 106 through the supporting ribs 108, the positioning rib 101 is connected to the supporting rib 108, and the elastic rib 102 protrudes from the side of the positioning rib 101 away from the attachment base 106.

[0056] When there are multiple elastic ribs 102 arranged at intervals, each elastic rib 102 can be connected in sequence through the positioning rib 101. The elastic rib 102 protrudes from the side of the positioning rib 101 away from the attachment substrate 106, so that the height of the crimping protrusion 103 is greater than the compression amount of the elastic rib 102, so that after the elastic rib 102 is compressed into place, the crimping protrusion 103 still protrudes from the positioning rib 101, thereby ensuring that the printed circuit board 300 will not have a hard contact with the positioning rib 101, and preventing the positioning rib 101 from crushing the printed circuit board 300.

[0057] Please refer to Figure 7When assembling the electronic device, the printed circuit board pressing device 100 is buckled on the electronic device housing 200, and the positioning ribs 101 can position the top of the electronic device housing 200 to prevent the printed circuit board pressing device 100 from moving in the horizontal direction relative to the electronic device housing 200. At the same time, by connecting the positioning ribs 101 to the supporting ribs 108, the distance that the elastic ribs 102 protrude from the attachment base 106 can be increased, that is, the size of the deformation gap 104 is increased, and the deformation capacity is improved.

[0058] In this embodiment, the elastic pressing body can be Figure 3 and Figure 8 The edge area of ​​the attachment substrate 106 shown in the figure can also be used as Fig. 9 The elastic compression bodies are shown to be arranged in the edge area and the middle area of ​​the attachment base 106. Of course, according to the actual application scenario, all the elastic compression bodies can be arranged in the middle area of ​​the attachment base 106. It can be understood by those skilled in the art that the utility model does not limit the actual arrangement position and number of the elastic compression bodies, and they can be arranged at corresponding positions according to actual compression requirements.

[0059] The upper limit of the clamping force applied by the elastic clamping body on the printed circuit board 300 can be confirmed through mechanical simulation. The deformation stress does not exceed the yield strength of the printed circuit board clamping device. The larger the printed circuit board 300, the more elastic ribs 102 are required.

[0060] Furthermore, a plurality of elastic pressing bodies are provided at the edge region of the attachment substrate 106, and each elastic pressing body is evenly arranged at the edge region of the attachment substrate 106. For some printed circuit boards 300 with a smaller area, it is only necessary to provide elastic pressing bodies at the edge region of the attachment substrate 106, and the pressing requirement can be met by pressing the edge of the printed circuit board 300.

[0061] The attachment substrate 106 is a polygonal structure, such as Figure 3 In the rectangular structure shown, each side of the attachment base 106 is provided with at least one elastic pressing body. Figure 3 In the illustrated solution, each side of the attachment substrate 106 is provided with an elastic pressing body; Figure 8 In the illustrated solution, two elastic compression bodies are provided on each side of the attachment substrate 106. It should be noted that the number of elastic compression bodies provided on each side of the attachment substrate 106 may be the same or different, for example, one elastic compression body is provided on some sides and multiple elastic compression bodies are provided on other sides, or multiple elastic compression bodies are provided on each side, but the number of elastic compression bodies provided on at least two sides is different.

[0062] like Fig. 9As shown, a plurality of elastic compression bodies are disposed in the middle region of the attachment substrate 106, and each elastic compression body is evenly arranged in the middle region of the attachment substrate 106. The arrangement of each elastic compression body in the middle region of the attachment substrate 106 can be arbitrary, and the utility model does not limit it.

[0063] The elastic compression bodies located in the middle area of ​​the attachment base 106 at least include a first group of elastic compression bodies and a second group of elastic compression bodies, and the first group of elastic compression bodies and the second group of elastic compression bodies are arranged crosswise. The first group of elastic compression bodies and the second group of elastic compression bodies may each have only one elastic compression body, or may each have multiple elastic compression bodies. The first group of elastic compression bodies and the second group of elastic compression bodies may be arranged vertically and crosswise, or at other angles.

[0064] like Figure 3 As shown, the edge of the attachment base 106 is provided with an outer folding edge 105, the elastic pressing body is provided on the inner side of the outer folding edge 105, and the side of the outer folding edge 105 facing the elastic pressing body is provided with a buckle 107 for clamping on the electronic device housing 200. In this embodiment, by providing the outer folding edge 105, a mounting base is provided for the buckle 107, and by providing the buckle 107, the printed circuit board clamping device 100 can be clamped with the electronic device housing 200, so as to achieve the fixation of the printed circuit board clamping device 100 and the electronic device housing 200. It should be noted that the buckle 107 should be staggered with the elastic pressing body, that is, the buckle 107 should be arranged away from the position of the elastic pressing body.

[0065] In summary, the printed circuit board pressing device 100 disclosed in the embodiment of the utility model has the following technical effects:

[0066] 1. Good integrity, can be made by injection molding, low cost, in radar, antenna and other radio frequency products, can reduce the use of metal fasteners such as screws, to avoid interference with antenna signals;

[0067] 2. Good tolerance, using the elastic deformation force of the elastic tendon 102, non-hard contact, with a certain degree of flexibility, low dimensional sensitivity, small impact of dimensional deviation on assembly, and friendly assembly;

[0068] 3. The force value is controllable. The clamping force can be flexibly set by adjusting the compressive deformation of the elastic tendon 102, the cantilever span, the thickness of the elastic tendon 102, the size of the crimping protrusion 103 and other parameters to achieve precise simulation control of the clamping force;

[0069] 4. Save product layout space. The area within 2 mm of the edge of the printed circuit board 300 is a prohibited area for device layout. This area can be used to arrange elastic pressing bodies to maximize space utilization and reduce product volume.

[0070] like Figure 7As shown, the embodiment of the utility model also discloses an electronic device, including an electronic device housing 200, a printed circuit board 300 and a printed circuit board pressing device 100. The printed circuit board 300 is arranged on the electronic device housing 200, and the printed circuit board 300 can be supported and positioned by positioning columns arranged in the electronic device housing 200.

[0071] The printed circuit board pressing device 100 is arranged on the electronic device housing 200 to press the printed circuit board 300. The printed circuit board pressing device 100 is the printed circuit board pressing device 100 disclosed in the above embodiment. The electronic device provided by the utility model has all the technical effects of the above printed circuit board pressing device 100, which will not be described in detail herein.

[0072] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0073] As shown in the specification and claims of this application, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not specifically refer to the singular, but may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0074] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0075] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A printed circuit board pressing device, characterized in that: include: An attachment substrate (106); An elastic pressing body is arranged on the attachment substrate (106), the elastic pressing body comprises an elastic rib body (102) and a crimping protrusion (103), a deformation gap (104) is provided between the elastic rib body (102) and the attachment substrate (106), and the crimping protrusion (103) is arranged on a side of the elastic rib body (102) facing away from the deformation gap (104).

2. The printed circuit board pressing device according to claim 1, characterized in that: It also includes a positioning rib (101) connected between two adjacent elastic ribs (102), wherein the positioning rib (101) is arranged on the attachment base (106); The two ends of the elastic rib (102) are connected to the attachment base (106) via the support rib (108), the positioning rib (101) is connected to the support rib (108), and the elastic rib (102) protrudes from a side of the positioning rib (101) away from the attachment base (106).

3. The printed circuit board pressing device according to claim 1, characterized in that: The elastic pressing body is arranged in the edge area and / or the middle area of ​​the attachment base (106).

4. The printed circuit board pressing device according to claim 3, characterized in that: A plurality of the elastic pressing bodies are provided in the edge region of the attachment base (106), and each of the elastic pressing bodies is evenly arranged in the edge region of the attachment base (106).

5. The printed circuit board pressing device according to claim 4, characterized in that: The attachment base (106) is a polygonal structure, and each side of the attachment base (106) is provided with at least one elastic pressing body.

6. The printed circuit board pressing device according to claim 3, characterized in that: A plurality of the elastic pressing bodies are arranged in the middle region of the attachment base (106), and each of the elastic pressing bodies is evenly arranged in the middle region of the attachment base (106).

7. The printed circuit board pressing device according to claim 6, characterized in that: The elastic compression bodies located in the middle area of ​​the attachment base (106) include at least a first group of elastic compression bodies and a second group of elastic compression bodies, and the first group of elastic compression bodies and the second group of elastic compression bodies are arranged crosswise.

8. The printed circuit board pressing device according to any one of claims 1 to 7, characterized in that: The surface of the crimping protrusion (103) facing away from the elastic rib (102) is a curved surface or a flat surface.

9. The printed circuit board pressing device according to any one of claims 1 to 7, characterized in that: The edge of the attachment base (106) is provided with an outer folded edge (105), the elastic pressing body is arranged on the inner side of the outer folded edge (105), and the outer folded edge (105) is provided with a buckle (107) for being snapped onto the electronic device housing (200) on one side facing the elastic pressing body.

10. An electronic device, characterized in that: include: Electronic device housing (200); A printed circuit board (300) is arranged on the electronic equipment housing (200); A printed circuit board pressing device (100) is arranged on the electronic equipment housing (200) to press the printed circuit board (300), and the printed circuit board pressing device (100) is a printed circuit board pressing device (100) as claimed in any one of claims 1 to 9.

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