Printed circuit board with stable star-moon screw hole structure
By setting stress relief channels on the copper ring, the problem of copper ring peeling and falling off during screw tightening in the star-moon hole was solved, thereby improving the stability and reliability of the circuit board.
Patent Information
- Application Number
- CN202520122489.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-01-17
AI Technical Summary
When screws are tightened, the copper rings in the existing star-moon holes are prone to peeling and falling off, affecting the reliability and lifespan of the circuit board.
Stress relief channels are set on the copper ring. One end of the stress relief channel extends to the inner edge of the copper ring, and the other end extends to the outer edge. The channel width is 0.5mm to 1mm. Multiple channels are evenly distributed, and rounded corners are set at the channels to disperse stress.
It effectively prevents the copper ring from peeling off, improves the reliability and lifespan of the circuit board, and ensures stable electrical performance.
Smart Images
Figure CN223885371U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to circuit board technical field more specifically, is related to a kind of printed circuit board with stable star-moon screw hole structure. BACKGROUND
[0002] In the design and manufacture of printed circuit board, the selection of positioning hole is crucial. Star-moon hole, as a commonly used positioning hole type, is composed of a large hole (non-metalized hole) in the middle and eight small holes evenly distributed on the hole ring.
[0003] From the fixed level, star-moon hole can accurately position the circuit board, ensuring the accurate position of each component during production and subsequent use. In terms of improving product reliability, it effectively prevents solder from flowing back onto the solder pad during soldering, reducing product failures caused by soldering problems. In addition, its eight grounding small holes are connected to the ground layer, improving grounding performance and making grounding more sufficient, ensuring the stability of circuit operation.
[0004] However, during screw tightening, potential problems such as peeling of the copper ring of the screw hole may occur due to the stress of the screw on the circuit board.
[0005] The above shortcomings need to be improved. SUMMARY
[0006] To solve or alleviate the problem of copper ring peeling during screw tightening of existing star-moon hole, the utility model provides a kind of printed circuit board with stable star-moon screw hole structure.
[0007] The technical solution of the utility model is as follows:
[0008] A kind of printed circuit board with stable star-moon screw hole structure, comprising a circuit board body, a copper ring is arranged on the circuit board body, a screw hole is arranged at the center of the copper ring of the circuit board body, a plurality of grounding holes are arranged on the copper ring, and a stress release channel is arranged on the copper ring.
[0009] The stress release channel of the above-mentioned printed circuit board with stable star-moon screw hole structure extends to the inner edge of the copper ring at one end and extends to the outer edge of the copper ring at the other end.
[0010] Further, the narrowest part of the stress release channel is 0.5mm-1mm wide.
[0011] Further, the stress release channel is located between adjacent grounding holes.
[0012] Further, the stress release channel is provided with multiple stress release channels, and the multiple stress release channels are evenly distributed on the copper ring.
[0013] Further, the copper ring is provided with a fillet at the stress release channel.
[0014] The printed circuit board with the stable star-moon screw hole structure has the stress release channel, which comprises a first channel and a second channel.
[0015] Further, the width of the first channel and the second channel gradually changes, and the width near one end of the edge is greater than that near the other end.
[0016] Further, the first channel and the second channel have a coincident section in the radial direction of the copper ring.
[0017] Further, the first channel, the second channel and the adjacent edge of the copper ring have a fillet.
[0018] The printed circuit board with the stable star-moon screw hole structure has the stress release channel, which comprises a first channel and a second channel. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.
[0020] Fig. 1 It is a structural schematic view of the embodiment 1 of the present application.
[0021] Fig. 2 It is a structural schematic view of the embodiment 2 of the present application.
[0022] Fig. 3 It is a structural schematic view of the embodiment 3 of the present application.
[0023] In the drawings, the reference signs are as follows: 100, circuit board body; 101, copper ring; 102, screw hole; 103, grounding hole; 104, stress release channel; 105, first channel; 106, second channel; 107, coincident section. DETAILED DESCRIPTION
[0024] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0025] It should be noted that when a component is referred to as "fixed," "set," or "connected" to another component, it may be located directly or indirectly on that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first," "second," etc., are used for ease of description only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "Many" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.
[0026] Example 1
[0027] like Figs. 1 to 3 As shown, a printed circuit board with a stable star and moon screw hole structure according to one embodiment of the present invention includes a circuit board body 100, a copper ring 101 provided on the circuit board body 100, a screw hole 102 provided at the center of the copper ring 101, a plurality of grounding holes 103 provided on the copper ring 101, and a stress relief channel 104 provided on the copper ring 101.
[0028] A copper ring 101 is precisely fabricated on the circuit board body 100 using processes such as etching or electroplating. A screw hole 102 is drilled in the center of the copper ring 101. Grounding holes 103 are drilled on the copper ring 101. The grounding holes 103 are ensured to be evenly distributed and of consistent diameter to guarantee good grounding performance. Stress relief channels 104 are fabricated on the copper ring 101 using chemical etching, laser etching, or mechanical processing methods.
[0029] In this embodiment, by setting the stress relief channel 104, the stress generated when the screw is tightened can be dispersed and guided, reducing the damage of stress to the printed circuit board, effectively preventing problems such as peeling and falling off of the copper ring 101 in the screw hole 102, extending the service life of the circuit board, and improving the reliability of the product.
[0030] like Fig. 2 As shown, in a preferred embodiment, the stress relief channel 104 extends at one end to the inner edge of the copper ring 101 and at the other end to the outer edge of the copper ring 101.
[0031] In the embodiment, one end of the stress release channel 104 extends to the inner edge of the copper ring 101, and the other end extends to the outer edge of the copper ring 101. The stress release channel 104 penetrates the copper ring 101 and forms a expansion joint on the copper ring 101, so that the copper ring 101 has better deformation ability and releases stress. The copper ring 101 can flexibly adjust its own form when facing stress. Through the expansion joint, the stress is evenly dispersed on the copper ring 101, preventing concentration in a local part to cause damage to the copper ring 101, effectively preventing common problems such as copper ring 101 peeling and falling off of the screw hole 102, prolonging the service life of the circuit board, significantly improving the reliability of the product in actual use, and ensuring the stable operation of the printed circuit board under various working conditions.
[0032] As shown in Fig. 2 In a preferred example, the width of the narrowest part of the stress release channel 104 is 0.5mm-1mm.
[0033] In the embodiment, by limiting the width of the narrowest part of the stress release channel 104, it is ensured that the stress release channel 104 has enough space to deform, thereby effectively releasing the stress generated when the screw is tightened. When the stress is transmitted to the stress release channel 104, the appropriate width allows the stress to be reasonably dispersed, avoiding excessive stress concentration. At the same time, this width does not excessively weaken the overall structural strength of the copper ring 101, ensuring that the copper ring 101 still plays a good role in carrying current and maintaining the stability of the circuit board. If the width is too narrow, the stress release function may not be fully realized, resulting in a risk of damage to the copper ring 101 under a large stress; and if the width is too wide, the electrical and mechanical properties of the copper ring 101 may be damaged, affecting the normal operation of the circuit board. Therefore, by setting the width of the narrowest part of the stress release channel 104 to 0.5mm-1mm, the stress release function is ensured while the overall performance and reliability of the copper ring 101 and the circuit board are taken into account.
[0034] As shown in Fig. 2 In a preferred example, the stress release channel 104 is located in the middle of the adjacent grounding hole 103.
[0035] By setting the stress release channel 104 in the middle of the adjacent grounding hole 103, on the one hand, the stress release channel 104 can release stress, and on the other hand, the integrity of the grounding hole 103 is ensured, and the grounding hole 103 can always maintain good electrical connection to ensure the stability of the grounding, thereby ensuring the stable and reliable electrical performance of the printed circuit board.
[0036] As shown in Fig. 2 In a preferred example, a plurality of stress release channels 104 are provided, and the plurality of stress release channels 104 are evenly distributed on the copper ring 101.
[0037] In this embodiment, by setting multiple stress release channels 104, on the one hand, the deformation ability of the copper ring 101 is improved, and the stress can be released faster. The uniform distribution of the layout makes the stress evenly spread on the copper ring 101, avoiding the emergence of local stress concentration weak points, greatly improving the stress bearing capacity of the copper ring 101. On the other hand, this design strengthens the overall protection of the copper ring 101, so that the copper ring 101 can flexibly cope with stress at all parts, effectively preventing problems such as deformation, peeling, and other problems of the copper ring 101 caused by uneven stress, thereby ensuring the electrical connection stability of the circuit board and improving the reliability and service life of the product.
[0038] As shown in Fig. 2 In a preferred example, the copper ring 101 is provided with a round corner at the stress release channel 104.
[0039] The round corner can disperse stress and avoid excessive stress concentration at sharp corners. Because stress concentration points are easily generated at right angles or sharp corners, leading to premature fatigue damage of the copper ring 101. The presence of a round corner allows stress to gradually spread along a smooth arc, preventing local stress concentration and enhancing the resistance of the copper ring 101 to stress.
[0040] Embodiment 2
[0041] The difference from embodiment 1 is that the stress release channel 104 includes a first channel 105 and a second channel 106, and the first channel 105 and the second channel 106 are provided at least one, the first channel 105 extends to the inner edge of the copper ring 101, and the second channel 106 extends to the outer edge of the copper ring 101.
[0042] The first channel 105 and the second channel 106 have a coincident section 107 in the radial direction of the copper ring 101.
[0043] In this embodiment, the first channel 105 extends to the inner edge of the copper ring 101, and the second channel 106 extends to the outer edge of the copper ring 101, and only extends to one side edge of the copper ring 101, ensuring the integrity of the entire copper ring 101, preventing the weakening of the structural strength caused by the through channel. At the same time, the first channel 105 and the second channel 106 can also quickly release the stress generated at different positions of the copper ring 101. The first channel 105 and the second channel 106 have a coincident section 107 in the radial direction of the copper ring 101, so that the stress release channel 104 is distributed completely in the radial direction of the copper ring 101, ensuring the stress release effect.
[0044] As shown in Fig. 2 In a preferred example, the width of the first channel 105 and the second channel 106 gradually changes, and the width near one end of the edge is greater than the width of the other end.
[0045] When the stress is released, the wider channel can better buffer the stress from the edge of the copper ring 101, so that the stress can be evenly dispersed in the transmission process. The edge stress of the copper ring 101 is large, and the wider near the edge ensures that the channel has sufficient carrying capacity in the key stress area, effectively preventing the copper ring 101 from being damaged due to excessive stress.
[0046] As shown in Fig. 2 In a preferred example, the included angle between the first channel 105, the second channel 106 and the adjacent edge of the copper ring 101 is a rounded angle.
[0047] When the stress is transmitted to these corner parts, the rounded angle can effectively disperse the stress and avoid stress concentration at the sharp corners. Compared with a right angle or an acute angle, the rounded angle allows the stress to be evenly distributed along a smooth arc, thereby reducing the risk of material fatigue and damage caused by stress concentration and helping to enhance the overall structural stability of the copper ring 101.
[0048] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A printed circuit board having a stable star moon screw hole structure, characterized by, The circuit board body is provided with a copper ring, a screw hole is arranged at the center of the copper ring, a plurality of grounding holes are arranged on the copper ring, and a stress release channel is arranged on the copper ring.
2. A printed circuit board having a star-moon screw hole structure according to claim 1, wherein One end of the stress release channel extends to the inner edge of the copper ring, and the other end extends to the outer edge of the copper ring.
3. A printed circuit board having a star-moon screw hole structure according to claim 2, wherein The narrowest part of the stress release channel is 0.5mm-1mm wide.
4. A printed circuit board having a star-moon screw hole structure according to claim 2, wherein The stress release channel is located between adjacent grounding holes.
5. A printed circuit board having a star-moon screw hole structure according to claim 2, wherein A plurality of stress release channels are arranged, and the plurality of stress release channels are uniformly distributed on the copper ring.
6. A printed circuit board having a star-moon screw hole structure according to claim 2, wherein The copper ring is provided with a round corner at the stress release channel.
7. A printed circuit board having a star-moon screw hole structure according to claim 1, wherein The stress release channel includes a first channel and a second channel, and at least one of the first channel and the second channel is arranged, the first channel extends to the inner edge of the copper ring, and the second channel extends to the outer edge of the copper ring.
8. A printed circuit board having a star-moon screw hole structure according to claim 7, wherein The width of the first channel and the second channel gradually changes, and the width near one end of the edge is greater than the width of the other end.
9. A printed circuit board having a star-moon screw hole structure according to claim 7, wherein The first channel and the second channel have a coincident segment in the radial direction of the copper ring.
10. A printed circuit board having a star-moon screw hole structure according to claim 7, wherein The included angle between the first channel, the second channel and the adjacent edge of the copper ring is a round corner.