PCB structure with high drilling precision

Abstract

The utility model discloses a high pair drilling precision's PCB structure, including PCB board main part, the board edge of PCB board main part is provided with a plurality of drilling rig positioning hole, drilling rig positioning hole is used for with PCB board main part positioning place in drilling rig mesa, the board edge four corners of PCB board main part are provided with an X -ray rake hole and a CCD rake hole respectively, X -ray rake hole is used for outer layer drilling target machine processing positioning use, the CCD rake hole is used for when the drilling of positive and negative surface CCD alignment use. The utility model provides high pair drilling precision's PCB structure is suitable for the PCB board piece of board thickness greater than 4mm carries out positive and negative surface pair drilling processing, effectively improves the consistency of positive and negative two face drilling, greatly improves the drilling precision.

Description

Technical Field

[0001] This utility model relates to the field of PCB manufacturing technology, specifically to a PCB structure with high drilling accuracy. Background Technology

[0002] In the field of electronics manufacturing, printed circuit boards (PCBs) are fundamental components of various electronic devices, and their processing quality directly affects the performance and reliability of electronic products. Among them, drilling is one of the key steps in PCB manufacturing, and the accuracy and quality of drilling play a decisive role in subsequent processes such as component installation and circuit connection.

[0003] In existing drilling methods, for PCB boards thicker than 4mm, the drill bit needs to penetrate deep into the board due to the significant thickness. Since the drill bit's cutting length is relatively limited, a two-sided drilling process is required. Currently, existing two-sided drilling processes generally rely on identifying CCD target holes machined on the outer layer of the PCB during drilling to achieve precise alignment of the front and back sides. Specifically, CCD target holes are pre-machined on the outer layer of the PCB board, serving as positioning references for subsequent drilling. During drilling on both sides, a CCD image recognition system identifies and positions these target holes to ensure positional accuracy.

[0004] However, in actual production, the aforementioned front and back drilling process is prone to problems such as drilling deviation and hole bursting in the CCD target hole. Once the CCD target hole suffers from drilling deviation or hole bursting, it will affect the accuracy of the CCD image recognition system, leading to recognition errors by the CCD image recognition system, resulting in large deviations in drilling accuracy, and ultimately causing the PCB board to be scrapped. Utility Model Content

[0005] The purpose of this invention is to provide a PCB structure with high drilling accuracy to solve the technical problem of large drilling accuracy deviation caused by CCD target hole issues when drilling from both sides in the prior art.

[0006] The technical solution of this utility model is as follows:

[0007] A high-precision PCB structure includes a PCB board body. The PCB board body has multiple drilling machine positioning holes on its edge. The drilling machine positioning holes are used to position the PCB board body on the drilling machine table. The four corners of the PCB board body are respectively provided with an X-ray rake hole and a CCD rake hole. The X-ray rake hole is used for positioning during outer layer drilling target processing. The CCD rake hole is used for CCD alignment during drilling on both sides.

[0008] As a preferred embodiment of this utility model, the drilling rig positioning holes are provided in three forms, and the three drilling rig positioning holes are distributed in an L-shape.

[0009] As a preferred embodiment of this utility model, one of the drill positioning holes is located in the middle of the upper edge of the PCB board body, and the other two drill positioning holes are located in the middle of the lower edge of the PCB board body.

[0010] As a preferred embodiment of this utility model, the CCD rake hole is closer to the edge of the PCB board body than the X-ray rake hole.

[0011] In a preferred embodiment of this utility model, the drilling rig positioning hole, the X-ray rake hole, and the CCD rake hole have the same diameter.

[0012] As a preferred embodiment of this utility model, the diameters of the drilling rig positioning hole, the X-ray rake hole, and the CCD rake hole are all 3.175 mm.

[0013] As a preferred embodiment of this utility model, the diameter of the drilling rig positioning hole is 3mm-3.5mm.

[0014] As a preferred embodiment of this utility model, the diameter of the X-ray rake hole is 3mm-3.5mm.

[0015] As a preferred embodiment of this utility model, the diameter of the CCD rake hole is 3mm-3.5mm.

[0016] As a preferred embodiment of this utility model, the thickness of the PCB board body is greater than 4mm.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This utility model provides a PCB structure with high drilling accuracy. By setting drilling positioning holes, the main body of the PCB board is positioned on the drilling table. Then, X-ray rake holes are set for positioning the outer layer drilling target machine to process CCD target holes required for drilling on both sides on the front side of the PCB board. Finally, the drilling is carried out on both sides of the CCD target, which can effectively improve the consistency of drilling on both sides and greatly improve drilling accuracy. It is suitable for drilling on both sides of PCB boards with a thickness greater than 4mm. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a PCB structure with high drilling accuracy in one embodiment of the present invention.

[0021] In the diagram,

[0022] 1. PCB board body; 2. Drilling machine positioning holes; 3. X-ray rake holes; 4. CCD rake holes. Detailed Implementation

[0023] 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 noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. It is also declared that the embodiments described below are only for explaining this utility model and are not intended to limit this utility model.

[0024] It should be noted that the terms "installation," "setting," "connection," and "fixing" 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, unless otherwise explicitly defined. Indications of orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used in the application's product, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. "A plurality" means two or more, unless otherwise explicitly defined.

[0025] Please see Figure 1This utility model provides a PCB structure with high drilling accuracy, including a PCB body 1 with a thickness greater than 4mm. Multiple drilling machine positioning holes 2 are provided on the edge of the PCB body 1. These holes are used to position the PCB body 1 on the drilling machine table, establishing a physical reference for subsequent processing. An X-ray rake hole 3 and a CCD rake hole 4 are respectively provided at the four corners of the PCB body 1. The X-ray rake hole 3 is used for positioning during outer layer drilling, allowing the CCD target holes required for drilling on both sides of the PCB body 1 to be machined on the front side, avoiding problems such as drilling deviation and hole bursting caused by directly machining CCD target holes in traditional processes. The X-ray target hole, in conjunction with the drilling machine positioning holes 2, forms a dual reference of "physical positioning + image positioning," ensuring the machining position accuracy of the CCD target holes. The CCD rake hole 4 is used for CCD alignment during drilling on both sides.

[0026] When using the high-precision PCB structure drilling process of this embodiment to process PCBs with a thickness greater than 4mm, the PCB body 1 is first positioned on the drilling table through multiple drilling machine positioning holes 2 on the PCB body 1. Then, a CCD camera is used to scan the X-Ray target hole on the PCB body 1 for positioning of the outer layer drilling target machine, so that the outer layer drilling target machine processes the CCD target hole required for drilling on both sides of the PCB body 1. Finally, the CCD target hole on the PCB body 1 is used to process the drilling on both sides during drilling.

[0027] The high-precision PCB structure of this embodiment is suitable for PCBs with a thickness greater than 4mm, and can be used for drilling on both sides. By setting the drill positioning hole 2, the PCB body 1 is positioned on the drill table. Then, the X-ray rake hole 3 is set for positioning the outer layer drill target machine to process the CCD target holes required for drilling on both sides on the front side of the PCB body 1. Finally, the drill holes are processed on both sides of the CCD target, which can effectively improve the consistency of drilling on both sides and greatly improve the drilling accuracy.

[0028] Please see Figure 1In one embodiment, three drilling positioning holes 2 are provided, and the three drilling positioning holes 2 are distributed in an L-shape. The L-shaped distribution of the three drilling positioning holes 2 effectively restricts the horizontal movement and rotation around the vertical axis of the PCB board body when it is placed on the drilling table, based on the principle that "two points determine a straight line, and three points determine a plane." This significantly improves positioning stability and avoids drilling position deviations caused by unstable positioning. Simultaneously, the three L-shaped positioning holes form a clear positioning reference, making the position of the PCB board body on the drilling table more precise, providing a reliable foundation for subsequent drilling processing, and helping to ensure the positional accuracy of drilling on both sides.

[0029] Furthermore, one of the drill positioning holes 2 is located in the middle of the upper edge of the PCB board body 1, and the other two drill positioning holes 2 are located in the middle of the lower edge of the PCB board body 1. By setting positioning holes in the middle of the upper and lower edges, the force on the PCB board body on the drill table can be more even, reducing the deformation or displacement of the PCB board body caused by uneven force, thereby ensuring the accuracy of drilling.

[0030] Please see Figure 1 In one embodiment, the CCD target hole 4 is closer to the edge of the PCB board body 1 than the X-ray target hole 3. With the CCD target hole closer to the board edge, the CCD image recognition system can capture the image of the target hole more clearly during drilling on both sides, reducing interference from the internal structure of the PCB board body or other factors due to the target hole's inward position. This improves recognition efficiency and accuracy, ensuring drilling precision. Simultaneously, the CCD target hole closer to the edge is less affected by factors such as the material properties and stress changes within the PCB board body during processing, reducing the probability of drilling deviation or hole bursting, further ensuring the normal operation of the CCD image recognition system and reducing drilling precision deviation.

[0031] In one embodiment, the drill positioning hole 2, X-ray rake hole 3, and CCD rake hole 4 all have the same diameter. Having the same diameter for all three types of holes eliminates the need for frequent changes of different drill bits during processing, reducing equipment adjustment time, improving production efficiency, and minimizing processing errors that might result from drill bit changes. Furthermore, the identical hole diameter ensures that positioning systems (such as the drill positioning device, X-ray target machine positioning system, and CCD image recognition system) maintain consistent standards for identifying and positioning different types of target holes, avoiding positioning errors caused by differences in hole diameter. This guarantees consistent and accurate positioning throughout the drilling process, further improving drilling precision.

[0032] In a specific embodiment, the diameters of the drill positioning hole 2, the X-ray rake, and the CCD rake hole 4 are all 3mm-3.5mm, preferably 3.175mm. A 3mm-3.5mm diameter hole ensures uniform force on the drill bit during drilling (high matching degree between drill bit diameter and hole diameter), reducing the probability of drilling deviation and hole bursts. A 3mm-3.5mm diameter hole creates a moderate hole wall thickness at the PCB board edge, avoiding insufficient positioning strength due to an excessively small hole diameter, while preventing the hole diameter from weakening the board edge structure due to an excessively large hole diameter. 3.175mm is a common standard drill bit specification (e.g., 1 / 8 inch), widely used in PCB processing equipment. Using this diameter allows for the direct use of general-purpose drill bits, reducing the need for custom tools and lowering tool procurement costs and inventory pressure. Furthermore, most drill bit positioning pins or clamping designs are compatible with 3.175mm hole diameters, achieving precise positioning through interference fits or clearance fits. Standardized hole diameters also reduce PCB board edge waste caused by non-standard hole diameters.

[0033] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

[0034] The present utility model patent has been described above with reference to the accompanying drawings. Obviously, the implementation of the present utility model patent is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present utility model patent, or the direct application of the inventive concept and technical solution of the present utility model patent to other occasions without modification, are all within the protection scope of the present utility model.

Claims

1. A PCB structure with high drilling accuracy, characterized in that, The device includes a PCB board body, and the edge of the PCB board body is provided with multiple drilling machine positioning holes. The drilling machine positioning holes are used to position the PCB board body on the drilling machine table. The four corners of the edge of the PCB board body are respectively provided with an X-ray rake hole and a CCD rake hole. The X-ray rake hole is used for positioning during the outer layer drilling target processing, and the CCD rake hole is used for CCD alignment during drilling on both sides.

2. The PCB structure with high drilling accuracy according to claim 1, characterized in that, The drilling rig has three positioning holes, and the three positioning holes are arranged in an L-shape.

3. The PCB structure with high drilling accuracy according to claim 2, characterized in that, One of the drilling rig positioning holes is located in the middle of the upper edge of the PCB board body, and the other two drilling rig positioning holes are located in the middle of the lower edge of the PCB board body.

4. The PCB structure with high drilling accuracy according to claim 1, characterized in that, Compared to the X-ray rake hole, the CCD rake hole is closer to the edge of the PCB board body.

5. The PCB structure with high drilling accuracy according to claim 1, characterized in that, The drilling rig positioning hole, the X-ray rake hole, and the CCD rake hole have the same diameter.

6. The PCB structure with high drilling accuracy according to claim 1, characterized in that, The diameters of the drilling rig positioning hole, the X-ray rake hole, and the CCD rake hole are all 3.175 mm.

7. The PCB structure with high drilling accuracy according to claim 1, characterized in that, The diameter of the drilling rig positioning hole is 3mm-3.5mm.

8. The PCB structure with high drilling accuracy according to claim 1, characterized in that, The diameter of the X-ray rake hole is 3mm-3.5mm.

9. The PCB structure with high drilling accuracy according to claim 1, characterized in that, The diameter of the CCD rake hole is 3mm-3.5mm.

10. The PCB structure with high drilling accuracy according to claim 1, characterized in that, The thickness of the PCB board body is greater than 4mm.

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