Screw hole pads and printed circuit boards

Abstract

This invention provides a screw hole pad, which is applied to a printed circuit board (PCB). The PCB is coated with a solder resist layer and has screw holes for screw installation. The screw hole pad includes a soldering portion and a pad body. The soldering portion includes a first solder groove and a second solder groove, which are recessed from the solder resist layer into the PCB to expose portions of the PCB. The pad body includes a first pad and a second pad, which are respectively disposed in the first solder groove and the second solder groove to electrically connect to the exposed PCB. The first pad and the second pad are also electrically connected to screws to ground the screws. A gap exists between the first pad and the second pad, forming a first notch and a second notch in the solder resist layer. Furthermore, this invention also provides a PCB. This technical solution solves the problem of solder flowing into screw holes and causing blockage.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit manufacturing technology, and in particular to a screw hole pad and a printed circuit board. Background Technology

[0002] To achieve screw grounding, a common practice is to create windows in the solder mask around the screw holes on the printed circuit board, exposing the copper foil for soldering. Solder is then applied directly to the copper foil, thus achieving grounding. However, this method is prone to solder flowing into the screw holes during soldering, causing blockages, affecting screw installation, increasing manual hole cleaning costs, and reducing production efficiency. Furthermore, solder buildup during soldering can create uneven pad surfaces, increasing impedance and resulting in insufficient electrical connection stability between the screw hole and the pads, ultimately affecting the grounding effect. Utility Model Content

[0003] In view of this, it is necessary to propose a screw hole pad and a printed circuit board.

[0004] In a first aspect, this utility model provides a screw hole pad applied to a printed circuit board (PCB). The PCB is coated with a solder resist layer and has screw holes for screw installation. The screw hole pad includes a soldering portion and a pad body. The soldering portion includes a first soldering groove and a second soldering groove, which are recessed from the solder resist layer into the PCB to expose portions of the PCB. The pad body includes a first pad and a second pad, which are respectively disposed in the first soldering groove and the second soldering groove to be electrically connected to the exposed PCB. The first pad and the second pad are also electrically connected to the screw to ground the screw. A gap exists between the first pad and the second pad, forming a first notch and a second notch in the solder resist layer.

[0005] Furthermore, the first pad includes a first head portion, a first tail portion, and a first middle portion. The first middle portion is located between the first head portion and the first tail portion. The first head portion and the first tail portion are located at the head and tail ends of the first pad, respectively, and have gaps with the second pad.

[0006] Furthermore, the first pad is an arc-shaped pad, and the first middle part is bent away from the screw hole; along the bending direction of the first middle part, the size of each position of the first middle part is equal.

[0007] Furthermore, the second pad includes a second head, a second tail, and a second middle portion. The second middle portion is located between the first head and the first tail, and the second head and the second tail are located at the head and tail ends of the second pad, respectively. The first head and the second head are arranged opposite to each other, and the first tail and the second tail are arranged opposite to each other.

[0008] Furthermore, the second pad is an arc-shaped pad, and the second middle part is bent away from the screw hole; along the bending direction of the second middle part, the size of each position of the second middle part is equal.

[0009] Furthermore, the first middle portion and the second middle portion are of equal size.

[0010] Furthermore, the first pad and the second pad are formed by soldering in a preset direction through a solder bath; the first notch and the second notch are set in the same direction, and the setting direction is horizontal with the preset direction.

[0011] Furthermore, the first notch and the second notch are respectively arranged side by side on the left and right sides of the screw hole in the aforementioned setting direction, and the first welding groove and the second welding groove are arranged side by side on the upper and lower sides of the screw hole.

[0012] Furthermore, the size of the gap forming the first notch is equal to the size of the gap forming the second notch.

[0013] Secondly, this utility model embodiment provides a printed circuit board coated with a solder resist layer and provided with screw holes for screw mounting; the printed circuit board also provides the aforementioned screw hole pads.

[0014] The aforementioned screw hole pads and printed circuit boards, with screw hole pads having notches and arc-shaped pads, utilize the notches to guide solder and prevent it from flowing into the screw holes, and set up solder grooves for the arc-shaped pads to make the pads flat, effectively solve the problems of solder easily flowing into screw holes causing blockage, uneven pad surfaces, and increased impedance in the prior art, thereby improving the stability of electrical connections. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1A first structural schematic diagram of a printed circuit board provided for an embodiment of the utility model.

[0017] Figure 2 A schematic diagram of the second structure of a printed circuit board provided for an embodiment of the utility model.

[0018] Figure 3 A schematic diagram of the structure of a screw hole pad applied to a printed circuit board, provided for an embodiment of the utility model.

[0019] Figure 4 A cross-sectional view of a printed circuit board provided for an embodiment of the utility model.

[0020] Component designations

[0021] Printed Circuit Board - 1000 First Section - 211

[0022] Screw hole pad -100 First tail -212

[0023] Screw hole-101 First middle section-213

[0024] Solder mask layer-102 Second pad-22

[0025] Screw-200 Second Head-221

[0026] Welding section-1 Second tail section-222

[0027] First welding groove-11 Second middle section-223

[0028] Second welding groove-12 First notch-31

[0029] Pad Body - 2 Second Notch - 32

[0030] First pad - 21 Preset orientation - X

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] To provide a clearer and more accurate understanding of the present invention, a detailed description will now be provided in conjunction with the accompanying drawings. The accompanying drawings illustrate examples of embodiments of the present invention, wherein the same reference numerals denote the same elements. It is to be understood that the scale shown in the accompanying drawings is not the actual scale of the present invention, and is for illustrative purposes only, and is not a drawing based on the original dimensions.

[0036] To achieve screw grounding, existing technologies typically involve creating windows in the solder mask around the screw holes on the printed circuit board (PCB) to expose the copper foil for soldering. Solder is then directly applied to the copper foil, thus achieving grounding. However, this method is prone to solder flowing into the screw holes during soldering, causing blockages, affecting screw installation, increasing manual hole cleaning costs, and reducing production efficiency. Furthermore, solder buildup around the screw holes during soldering can lead to uneven pad surfaces, increasing impedance and affecting grounding effectiveness. This application addresses this issue by improving the PCB design to prevent solder from flowing into the screw holes.

[0037] Please refer to Figure 2 and Figure 4 This application provides a screw hole pad 100. The screw hole pad 100 is applied to a printed circuit board 1000. The printed circuit board 1000 is coated with a solder mask layer 102 and has screw holes 101 for mounting screws 200.

[0038] The screw hole pad 100 includes a soldering portion 1 and a pad body 2. The soldering portion 1 includes a first soldering groove 11 and a second soldering groove 12. The first soldering groove 11 and the second soldering groove 12 are recessed from the solder mask layer 102 toward the printed circuit board 1000, respectively, to expose portions of the printed circuit board 1000. The pad body 2 includes a first pad 21 and a second pad 22. The first pad 21 and the second pad 22 are respectively disposed in the first soldering groove 11 and the second soldering groove 12, respectively, to be electrically connected to the exposed printed circuit board 1000. The first pad 21 and the second pad 22 are also electrically connected to a screw 200, respectively, to ground the screw 200. A gap exists between the first pad 21 and the second pad 22, and a first notch 31 and a second notch 32 are formed in the solder mask layer 102, respectively. In the actual soldering process, when the screw hole pad 100 passes through the solder bath, it can guide the solder into the first soldering groove 11 and the second soldering groove 12. Meanwhile, since a gap 31 and a second gap 32 are formed between the first pad 21 and the second pad 22, when solder overflows from the printed circuit board 1000, the excess solder can be guided out of the printed circuit board 1000 through the first gap 31 and the second gap 32 to avoid solder accumulation in the first soldering groove 11 and the second soldering groove 12, and prevent it from flowing into the screw hole 101, thus preventing the hole from being blocked. Accordingly, the screw hole pad 100 provided in this application not only reduces the need for manual cleaning of the screw hole 101, but also reduces the occurrence of solder accumulation, thereby enhancing the electrical connection stability between the screw 200 and the screw hole pad 100, and thus achieving a better grounding effect.

[0039] like Figure 3 As shown, the first pad 21 is an arc-shaped pad. The first pad 21 includes a first head portion 211, a first tail portion 212, and a first middle portion 213. The first middle portion 213 is located between the first head portion 211 and the first tail portion 212. The first head portion 211 and the first tail portion 212 are located at the head and tail ends of the first pad 21, respectively, and each has a gap with the second pad 22. The first middle portion 213 is bent away from the screw hole 101. Along the bending direction of the first middle portion 213, the dimensions of all positions of the first middle portion 213 are equal.

[0040] Correspondingly, the second pad 22 is also an arc-shaped pad. The second pad 22 includes a second head portion 221, a second tail portion 222, and a second middle portion 223. The second middle portion 223 is located between the first head portion 211 and the first tail portion 212. The second head portion 221 and the second tail portion 222 are located at the head and tail ends of the second pad 22, respectively. The second middle portion 223 is curved away from the screw hole 101. Along the curvature direction of the second middle portion 223, the dimensions of each position of the second middle portion 223 are equal.

[0041] In this embodiment, the first head portion 211 and the second head portion 221 are arranged opposite to each other, and the first tail portion 212 and the second tail portion 222 are arranged opposite to each other. The first pad 21 and the second pad 22 are the same pad, that is, the first middle portion 213 and the second middle portion 223 are of equal size.

[0042] In this embodiment, the first pad 21 and the second pad 22 are formed by soldering in a pre-defined direction X using a solder bath. The pre-defined direction X can be either from the head to the tail of the pad or from the tail to the head. That is, the pre-defined direction X can be from the first head 211 to the first tail 212 and from the second head 221 to the second tail 222, or from the first tail 212 to the first head 211 and from the second tail 222 to the second head 221. The first notch 31 and the second notch 32 are positioned in the same direction and are horizontally aligned with the pre-defined direction X. Specifically, the first notch 31 and the second notch 32 are arranged side-by-side on the left and right sides of the screw hole 101, respectively. The first solder groove 11 and the second solder groove 12 are arranged side-by-side on the upper and lower sides of the screw hole 101.

[0043] Furthermore, the first welding groove 11 and the second welding groove 12 are identical welding grooves and are symmetrically arranged about the screw hole 101. The first notch 31 and the second notch 32 are also symmetrically arranged about the screw hole 101. Since the first pad 21 and the second pad 22 are identical pads, the gap size forming the first notch 31 is equal to the gap size forming the second notch 32. For example, the screw hole pad 100 provided in this application can be designed such that the gap size forming the first notch 31 and the second notch 32 is both 1.5mm, and the pads in the first welding groove 11 and the second welding groove 12, that is, the middle parts of the first pad 21 and the second pad 22, that is, the first middle part 213 and the second middle part 223, are respectively designed to be 1.5mm in size, so that the screw 200 in the screw hole 101 with a diameter of 4.0mm can be grounded.

[0044] Understandably, since the first pad 21 and the second pad 22 are respectively housed in the first soldering groove 11 and the second soldering groove 21, in order to accommodate the grounding of screws 200 in screw holes 101 with different diameters, the thickness of the first pad 21 and the second pad 22, that is, the size of the first middle part 213 and the second middle part 223, can be adjusted according to the diameter of the screw hole 101, that is, the soldering process of the solder pot is adjusted by adjusting the diameter of the screw hole 101.

[0045] Please refer to Figure 1This application also provides a printed circuit board 1000. The printed circuit board 1000 is coated with a solder resist layer 102 and has screw holes 101 for mounting screws 200. The printed circuit board 1000 also has screw hole pads 100. The specific features of the screw hole pads 100 have been described in detail above and will not be repeated here.

[0046] In the above embodiments, the screw hole pads with notches and arc-shaped pads are used to guide the solder to avoid flowing into the screw holes. The solder groove is set to make the pads flat, which effectively solves the problems of solder easily flowing into the screw holes and causing blockage, uneven pad surface and increased impedance in the prior art, and improves the stability of electrical connection.

[0047] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from the spirit and scope of this application. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model is also intended to include these modifications and variations.

[0048] The above-listed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A screw hole pad, characterized by, The screw hole pads are applied to a printed circuit board coated with a solder resist layer and provided with screw holes for screw mounting; the screw hole pads include: The welding section includes a first welding groove and a second welding groove, wherein the first welding groove and the second welding groove are recessed from the solder resist layer toward the printed circuit board, so as to expose a portion of the printed circuit board. The pad body includes a first pad and a second pad, the first pad and the second pad being respectively disposed in the first soldering groove and the second soldering groove, so as to be electrically connected to the exposed printed circuit board; the first pad and the second pad are also electrically connected to the screw so that the screw is grounded; Wherein, there is a gap between the first pad and the second pad, and a first gap and a second gap are respectively formed in the solder mask layer.

2. The screw hole pad of claim 1, wherein, The first pad includes a first head, a first tail, and a first middle portion. The first middle portion is located between the first head and the first tail. The first head and the first tail are located at the head and tail ends of the first pad, respectively, and have gaps with the second pad.

3. The screw hole pad of claim 2, wherein, The first pad is an arc-shaped pad, and the first middle part is bent away from the screw hole; along the bending direction of the first middle part, the size of each position of the first middle part is equal.

4. The screw hole pad of claim 3, wherein, The second pad includes a second head, a second tail, and a second middle portion. The second middle portion is located between the first head and the first tail. The second head and the second tail are located at the head and tail ends of the second pad, respectively. The first head and the second head are arranged opposite to each other, and the first tail and the second tail are arranged opposite to each other.

5. The screw hole pad of claim 4, wherein, The second pad is an arc-shaped pad, with the second middle portion bent away from the screw hole; along the bending direction of the second middle portion, the dimensions of each position of the second middle portion are equal.

6. The screw hole pad as described in claim 5, characterized in that, The first middle section and the second middle section are of equal size.

7. The screw hole pad of claim 1, wherein, The first pad and the second pad are formed by soldering in a preset direction through a solder bath; the first notch and the second notch are set in the same direction, and the setting direction is horizontal with the preset direction.

8. The screw hole pad of claim 7, wherein, The first notch and the second notch are respectively arranged side by side on the left and right sides of the screw hole in the aforementioned setting direction, and the first welding groove and the second welding groove are arranged side by side on the upper and lower sides of the screw hole.

9. The screw hole pad of claim 1, wherein, The size of the gap forming the first notch is equal to the size of the gap forming the second notch.

10. A printed circuit board, characterized by The printed circuit board is coated with a solder resist layer and has screw holes for screw mounting; the printed circuit board also has screw hole pads as described in any one of claims 1-9.

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