PCB bonding pad compensation design method
By adding a pointed structure and compensation strip to the externally expanded additional compensation area on the basis of etching compensation, the problem of pad etching deformation is solved, ensuring the consistency of pad shape and improving the quality of PCB pads.
Patent Information
- Application Number
- CN202511693007.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-18
- Publication Date
- 2026-02-13
AI Technical Summary
During the PCB pad etching process, uneven etching at the four corners and outer edges of the pads can cause shape deformation, affecting pad quality, especially the inconsistency between independent pads and adjacent pads.
Additional compensation is added on top of the etching compensation to form an outward-expanding additional compensation area, including setting pointed structures and additional compensation strips at the four corners of the pads to ensure that the shape of the pads on both sides is consistent after etching.
It effectively counteracts etching deformation, ensures that the pad shape meets requirements, and avoids quality risks, especially the shape consistency issues of independent pads and adjacent pads.
Smart Images
Figure CN121531597A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of printed circuit board manufacturing technology, specifically to a PCB pad compensation design method. Background Technology
[0002] In the PCB industry, the required solder pads are fabricated along with the circuitry. When etching the circuitry and solder pads, the amount of etching by the etching solution on the copper sides of the circuitry is considered. Therefore, when creating the overlay covering the circuitry pattern, an etching compensation amount is added to the designed linewidth. The compensation amount around the solder pads is usually the same (e.g., ...). Figure 1 As shown); for two adjacent pads, after acid etching, the four corners of the pads will be partially etched away, forming rounded corners. This causes the shape of the pads to be deformed relative to the square shape required in the design. Furthermore, because the outer areas of the two pads are larger, the etching amount is greater than that in the middle area of the adjacent pads. After etching, the two pads will exhibit a deformation where the sides are smaller and the middle is thicker, resulting in a single pad forming a shape where the outer side is smaller and the inner side is larger (e.g., Figure 2 As shown, the shape of the pads is critical, and large deformations will directly affect the use of subsequent products. In particular, for a single pad that is set independently, there is an empty area around it during etching. When using conventional etching compensation, the two ends will be too small during etching. Summary of the Invention
[0003] To address the aforementioned shortcomings of existing technologies, this invention provides a PCB pad compensation design method. It adds additional compensation to the conventional etching compensation, making the shapes of the two sides of the etched pads basically consistent, avoiding the quality risks caused by pad inconsistencies, and ensuring that the pad shapes meet the requirements.
[0004] To solve the above-mentioned technical problems, the present invention provides a PCB pad compensation design method, wherein the size of the pad is further compensated on the basis of etching compensation to form an outwardly expanding additional compensation area. The additional compensation area includes pointed structures located at the four corners of the pad and protruding outward.
[0005] Furthermore, an etch compensation area of uniform width is provided around the pad, and pointed structures protruding outward are provided at the four corners of the etch compensation area.
[0006] Furthermore, when the pad is an independent pad, its surrounding area is an empty area without copper. The pointed structures at the four corners of the etching compensation area are the same, and the pointed structures cover the long and short sides of the four corners of the etching compensation area. The additional compensation area also includes an additional compensation strip located outside the long side of the etching compensation area and used to connect the two pointed structures.
[0007] Furthermore, the two pointed structures on the short side of the etch compensation area extend obliquely from their tips toward the center point of the short side of the etch compensation area.
[0008] Furthermore, the farthest end of the pointed structure is 15% of the long side dimension of the etching compensation area in the long side direction and 10% of the short side dimension of the etching compensation area in the short side direction. The width of the additional compensation strip is 5% of the short side dimension of the etching compensation area.
[0009] Furthermore, the length of the additional compensation strip is 40% of the long side dimension of the etching compensation area, and the additional compensation strip is located in the middle of the long side of the etching compensation area; one side of the pointed structure first extends parallel from its tip along the long side direction of the pad to the short side region of the corresponding etching compensation area, and then extends obliquely toward the additional compensation strip and connects to one end of the additional compensation strip; the other side of the pointed structure first extends obliquely from its tip to the long side region of the corresponding etching compensation area, and the vertical distance between the extended end point and the etching compensation area is 7.5% of the long side dimension of the etching compensation area, and then the end point extends obliquely toward the center point of the short side of the etching compensation area.
[0010] Furthermore, when the pads include two adjacent first pads and second pads, the vertical distance between the etch compensation areas on the outer periphery of the two pads is 5% of the short side dimension of the etch compensation area; each of the two corners of the etch compensation area away from the other pad is provided with an outwardly protruding first pointed structure, which covers the long and short sides of the two corners of the etch compensation area, and an additional compensation strip is provided between the two first pointed structures located outside the long side of the etch compensation area to connect the two first pointed structures; each of the two corners of the etch compensation area near the other pad is provided with a second pointed structure located outside its short side and protruding outward, the first pointed structure, the etch compensation strip, and the second pointed structure together constitute an additional compensation area, while no additional compensation area is provided on the adjacent sides of the two pads; the size of the first pointed structure is larger than the size of the first pointed structure.
[0011] Furthermore, the first and second pointed structures on the short side of the etch compensation area both extend obliquely from their tips toward the center point of the short side of the etch compensation area.
[0012] Furthermore, the farthest end of the first pointed structure is 15% of the long side dimension of the etching compensation area in the long side direction and 10% of the short side dimension of the etching compensation area in the short side direction; the width of the additional compensation strip is 5% of the short side dimension of the etching compensation area; and the farthest end of the second pointed structure is 10% of the long side dimension of the etching compensation area in the long side direction.
[0013] Furthermore, the length of the additional compensation strip is 40% of the long side dimension of the etching compensation area, and the additional compensation strip is located in the middle of the long side of the etching compensation area; one side of the first pointed structure first extends parallel from its tip along the long side direction of the pad to the short side region of the corresponding etching compensation area, and then extends obliquely toward the additional compensation strip and connects to one end of the additional compensation strip; the other side of the first pointed structure first extends obliquely from its tip to the long side region of the corresponding etching compensation area, and the vertical distance of the extended end point from the etching compensation area is 7.5% of the long side dimension of the etching compensation area, and then the end point extends obliquely toward the center point of the short side of the etching compensation area; one side of the second pointed structure is flush with the long side of the etching compensation area, and the other side of the second pointed structure extends obliquely from its tip toward the center point of the short side of the etching compensation area.
[0014] Compared with the prior art, the present invention has the following beneficial effects: In this invention, the pad size is based on conventional etching compensation, and additional compensation is added at its four corners to form an outward-expanding additional compensation area. This is to offset the problem of pad deformation caused by excessive etching due to the empty space at the four corners and outer sides of the pad, so that the shape of the two sides of the etched pad is basically consistent, avoiding the quality risks caused by inconsistent pads, and ensuring that the pad shape meets the requirements. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of conventional etching compensation around the pads in existing circuitry. Figure 2 This is a schematic diagram of the existing pads after etching. Figure 3 This is a schematic diagram showing the additional compensation applied around two adjacent pads in Example 1. Figure 4 This is a schematic diagram of additional compensation around the independent pads in Example 2. Detailed Implementation
[0016] To better understand the technical content of this invention, the technical solution of this invention will be further introduced and explained below in conjunction with specific embodiments.
[0017] Example 1 like Figure 3As shown in this embodiment, a PCB pad compensation design method is used. During the process of etching circuits on the PCB, the required pads are etched and manufactured simultaneously. This embodiment takes the fabrication of two adjacent pads, first pad 1 and second pad 2, as an example. Both pads are square. To avoid deformation of the four corners of the square pads due to excessive etching, the size of the pads is further compensated on the basis of conventional etching compensation, forming an outward-expanding additional compensation area. The additional compensation area includes pointed structures located at the four corners of the pads and protruding outwards. That is, when designing the pad pattern for etching, pointed structures are set at the four corners of the pad pattern, so that the copper layer surface of the pointed structures is covered by the pad pattern. The pointed structures are etched away during the etching process to offset the excessive etching at the four corners of the pads, so that the shape of the two sides of the etched pads is basically consistent, avoiding the quality risks caused by inconsistent pads and ensuring that the pad shape meets the requirements.
[0018] Specifically, such as Figure 3 As shown, an etch compensation area 3 of uniform width is provided around the two pads. The vertical distance between the etch compensation areas 3 on the outer periphery of the two pads is 5% of the short side dimension of the etch compensation area 3, so that the pads maintain the minimum spacing. At the four corners of the etch compensation area 3, there are pointed structures protruding outward.
[0019] Preferred, such as Figure 3 As shown, to avoid deformation caused by inconsistent etching amounts on both sides of the square pad, a first pointed structure 31 protruding outward is provided at each of the two corners of the etching compensation area 3 of a single pad away from the other pad. That is, identical first pointed structures 31 are provided at the two corners of the outer open area of both pads. The first pointed structures 31 cover the long and short sides of the outer corners of the etching compensation area 3, and an additional compensation strip 32 is provided between the two first pointed structures 31, located outside the long side of the etching compensation area 3, to connect the two first pointed structures 31. In other words, the outer sides of both pads are covered by the first pointed structures 31 and the additional compensation strip 32. In the etch compensation area 3, a second pointed structure 33 is provided at each of the two corners near the other pad, protruding outward from the outside of its short side. The size of the first pointed structure is larger than that of the first pointed structure. The first pointed structure 31, the etch compensation strip 32, and the second pointed structure 33 together constitute an additional compensation area. However, no additional compensation area is provided on the adjacent sides of the two pads. That is, the amount of additional compensation in the open area outside the two pads is greater than the amount of compensation in the adjacent area inside the two pads, so as to offset the problem of inconsistent shape on both sides due to different etching amounts. This makes the shape of the two sides of the etched pad basically consistent, avoids the quality risk caused by the inconsistency of the pads, and ensures that the shape of the pad meets the requirements.
[0020] In one embodiment, such as Figure 3As shown, the first pointed structure 31 and the second pointed structure 32 on the short side of the etching compensation area 3 both extend obliquely from their tips toward the center point of the short side of the etching compensation area 3, that is, the first pointed structure 31 and the second pointed structure 32 meet at the center point of the short side of the etching compensation area 3.
[0021] In one embodiment, such as Figure 3 As shown, the farthest end (i.e., the tip) of the first pointed structure 31 is 15% of the length of the long side of the etch compensation area 3 in the direction of the long side of the pad and 10% of the length of the short side of the etch compensation area 3 in the direction of the short side of the pad. That is, the first pointed structure extends outward along the long side and the short side of the etch compensation area 3 by 15% and 10% of its respective length, respectively. The width of the additional compensation strip 32 is 5% of the length of the short side of the etch compensation area. The farthest end (i.e., the tip) of the second pointed structure 33 is 10% of the length of the long side of the etch compensation area 3 in the direction of the long side of the pad.
[0022] In one embodiment, such as Figure 3 As shown, the length of the additional compensation strip 32 is 40% of the long side dimension of the etching compensation area 3, and the additional compensation strip 32 is located in the middle of the long side of the etching compensation area 3; one side of the first pointed structure 31 first extends parallel from its tip along the long side direction of the pad to the corresponding short side region of the etching compensation area 3, that is, the endpoint after parallel extension is located in the width region of the short side of the etching compensation area 3, and then extends obliquely towards the additional compensation strip 32 and connects to one end of the additional compensation strip 32; the other side of the first pointed structure 32 first extends obliquely from its tip to the width region of the corresponding long side of the etching compensation area 3. In the region, the extended endpoint is 7.5% of the length of the long side of the etching compensation area 3 at a vertical distance from the short side of the etching compensation area 3. Then the endpoint extends obliquely towards the center point of the short side of the etching compensation area 3. That is, the angles of the two oblique extensions are different, forming a turning angle between the connection points of the two oblique extensions. One side of the second pointed structure 33 is flush with the long side of the etching compensation area 3, and the other side of the second pointed structure 33 extends obliquely from its tip towards the center point of the short side of the etching compensation area 3, and then intersects with one side of the first pointed structure 31 at the center point of the short side of the etching compensation area 3.
[0023] Example 2 like Figure 4As shown in this embodiment, a PCB pad compensation design method is used. During the PCB circuit fabrication process, the required pads are etched simultaneously. This embodiment takes the fabrication of a single pad 10 as an example. Pad 10 is a square pad. To avoid deformation at the four corners and sides of the square pad due to excessive etching, the pad size is further compensated on top of the conventional etching compensation, forming an outward-expanding additional compensation area. The additional compensation area includes pointed structures located at the four corners of the pad and protruding outwards. That is, when designing the pad pattern for etching, pointed structures are set at the four corners of the pad pattern, so that the copper layer surface of the pointed structures is covered by the pad pattern. The pointed structures are etched away during the etching process to offset the excessive etching at the four corners of the pad, making the shape of the two sides of the etched pad basically consistent, avoiding the quality risks caused by inconsistent pads, and ensuring that the pad shape meets the requirements. Specifically, such as Figure 4 As shown, an etching compensation area 3 of uniform width is provided around the pad 10. The area around the pad is a copper-free open area. Therefore, at the four corners of the etching compensation area 3, there are pointed structures 30 with the same structure and size that protrude outward. That is, the pointed structures 30 at the four corners of the etching compensation area 3 are the same. The pointed structures 30 cover the long side and short side of the four corners of the etching compensation area. The additional compensation area also includes an additional compensation strip 32 located outside the two long sides of the etching compensation area 3 and used to connect the two pointed structures 30 at the long side.
[0024] In one embodiment, such as Figure 4 As shown, the two pointed structures 30 on the short side of the etching compensation area 3 extend obliquely from their tips toward the center point of the short side of the etching compensation area 3, that is, the two pointed structures 30 on the short side meet at the center point of the short side of the etching compensation area 3.
[0025] In one embodiment, such as Figure 4 As shown, the farthest end (i.e., the tip) of the pointed structure 30 is 15% of the length of the long side of the etch compensation area 3 along the long side of the pad and 10% of the length of the short side of the etch compensation area 3 along the short side of the pad. That is, the pointed structure 30 extends outwards along the long and short sides of the etch compensation area 3 by 15% and 10% of its respective length. The width of the additional compensation strip 32 is 5% of the length of the short side of the etch compensation area.
[0026] In one embodiment, such as Figure 4As shown, the length of the additional compensation strip 32 is 40% of the long side dimension of the etching compensation area 3, and the additional compensation strip is located in the middle of the long side of the etching compensation area; one side of the pointed structure 30 first extends parallel from its tip along the long side direction of the pad to the corresponding short side region of the etching compensation area 3, that is, the endpoint after parallel extension is located in the width region of the short side of the etching compensation area 3, and then extends obliquely toward the additional compensation strip 32 and connects with one end of the additional compensation strip 32; the other side of the pointed structure 30 first extends obliquely from its tip to the width region of the corresponding long side of the etching compensation area 3, and the vertical distance of the endpoint after extension from the short side of the etching compensation area 3 is 7.5% of the long side dimension of the etching compensation area, and then the endpoint extends obliquely toward the center point of the short side of the etching compensation area 3, that is, the angles of the two oblique extensions are different, and a turning angle is formed between the connection points of the two oblique extensions.
[0027] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.
Claims
1. A PCB pad compensation design method, characterized in that, The size of the pads is further compensated on the basis of etching compensation to form an outwardly expanding additional compensation area. The additional compensation area includes pointed structures located at the four corners of the pads and protruding outwards.
2. The PCB pad compensation design method according to claim 1, characterized in that, An etch compensation area of uniform width is provided around the pad, and a pointed structure protruding outward is provided at each of the four corners of the etch compensation area.
3. The PCB pad compensation design method according to claim 2, characterized in that, When the pad is an independent pad, its surrounding area is an empty area without copper. The pointed structures at the four corners of the etching compensation area are the same, and the additional compensation area also includes an additional compensation strip located outside the long side of the etching compensation area and used to connect the two pointed structures.
4. The PCB pad compensation design method according to claim 3, characterized in that, The two pointed structures on the short side of the etch compensation area extend at an angle from their tips toward the center of the short side of the etch compensation area.
5. The PCB pad compensation design method according to claim 4, characterized in that, The farthest end of the pointed structure is 15% of the long side dimension of the etching compensation area in the long side direction and 10% of the short side dimension of the etching compensation area in the short side direction. The width of the additional compensation strip is 5% of the short side dimension of the etching compensation area.
6. The PCB pad compensation design method according to claim 5, characterized in that, The length of the additional compensation strip is 40% of the long side dimension of the etch compensation area, and the additional compensation strip is located in the middle of the long side of the etch compensation area; one side of the pointed structure first extends parallel from its tip along the long side direction of the pad to the short side area of the corresponding etch compensation area, and then extends obliquely toward the additional compensation strip and connects to one end of the additional compensation strip; the other side of the pointed structure first extends obliquely from its tip to the long side area of the corresponding etch compensation area, and the vertical distance of the extended end point from the etch compensation area is 7.5% of the long side dimension of the etch compensation area, and then the end point extends obliquely toward the center point of the short side of the etch compensation area.
7. The PCB pad compensation design method according to claim 2, characterized in that, When the pads include two adjacent first pads and second pads, the vertical distance between the etch compensation areas on the outer periphery of the two pads is 5% of the short side dimension of the etch compensation area; each of the two corners of the etch compensation area away from the other pad is provided with an outwardly protruding first pointed structure, and an additional compensation strip located outside the long side of the etch compensation area and used to connect the two first pointed structures is provided between the two first pointed structures; each of the two corners of the etch compensation area near the other pad is provided with a second pointed structure located outside its short side and protruding outward, the first pointed structure, the etch compensation strip, and the second pointed structure together constitute an additional compensation area, while no additional compensation area is provided on the adjacent sides of the two pads; the size of the first pointed structure is larger than the size of the first pointed structure.
8. The PCB pad compensation design method according to claim 7, characterized in that, The first and second pointed structures on the short side of the etch compensation area both extend obliquely from their tips toward the center point of the short side of the etch compensation area.
9. The PCB pad compensation design method according to claim 8, characterized in that, The farthest end of the first pointed structure is 15% of the long side dimension of the etching compensation area in the vertical direction of the long side and 10% of the short side dimension of the etching compensation area in the vertical direction of the short side; the width of the additional compensation strip is 5% of the short side dimension of the etching compensation area; the farthest end of the second pointed structure is 10% of the long side dimension of the etching compensation area in the vertical direction of the long side.
10. The PCB pad compensation design method according to claim 9, characterized in that, The length of the additional compensation strip is 40% of the long side dimension of the etching compensation area, and the additional compensation strip is located in the middle of the long side of the etching compensation area; one side of the first pointed structure first extends parallel from its tip along the long side direction of the pad to the short side region of the corresponding etching compensation area, and then extends obliquely toward the additional compensation strip and connects to one end of the additional compensation strip; the other side of the first pointed structure first extends obliquely from its tip to the long side region of the corresponding etching compensation area, and the vertical distance of the extended end point from the etching compensation area is 7.5% of the long side dimension of the etching compensation area, and then the end point extends obliquely toward the center point of the short side of the etching compensation area; one side of the second pointed structure is flush with the long side of the etching compensation area, and the other side of the second pointed structure extends obliquely from its tip toward the center point of the short side of the etching compensation area.