A line corner etching protection structure of a PCB

Abstract

The utility model relates to a line angle etching protection structure of PCB circuit board, including PCB board, be equipped with a plurality of wiring on the PCB board, and the gap between different wiring is etching area, part wiring has line angle, and the line angle of the wiring with line angle is equipped with etching compensation circle, and the center of etching compensation circle is located inside the wiring, and the edge of etching compensation circle is located at the vertex angle of line angle, the utility model discloses a line angle of the wiring is provided with etching compensation circle, forms the additional compensation area at the line angle, realizes in the etching process, and etching medicine water bites and eats compensation area first, thereby offsets the bite and eats amount of line angle area of medicine water, reduces the deformation of line angle because of etching, avoids the line angle that originally should be rectangular and is etched into arc shape, thereby ensures the line angle after etching to be close to the morphology of original design, improves the function of radio frequency line, satisfies the requirement of high -end radio frequency line to figure precision.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency circuit PCB pattern etching, specifically, to a line corner etching protection structure for PCB circuit boards. Background Technology

[0002] In the high-end RF circuit PCB pattern etching process, the routing pattern of the PCB circuit board has a significant impact on the RF function. In particular, for high-end RF lines with line corner design, the precise shape of the line corner is one of the key factors to ensure RF performance.

[0003] Existing circuit etching processes involve steps such as pattern application, exposure, development, and side etching to produce circuits with linewidths close to the customer's original design. However, for high-end RF lines with corners, the irregular etching process of the etching solution causes uneven etching in the corner areas. The sharp corners are etched most severely, causing what should be rectangular corners to be etched into rounded shapes. This directly affects the functionality of the RF line and fails to meet the pattern precision requirements of high-end RF circuits. Utility Model Content

[0004] To address the problem that in current PCB etching processes, the corners of traces are easily eroded by etching solutions, turning into arc shapes and affecting the functionality of radio frequency lines, this invention provides a corner etching protection structure for PCBs.

[0005] The technical solution of this utility model is as follows:

[0006] A line corner etching protection structure for a PCB circuit board is characterized by: including a PCB board, on which a plurality of traces are provided, the gap between different traces being an etching area; some traces have line corners, and traces with line corners have etching compensation circles at their line corners; and the center of the etching compensation circle is located inside the trace, and the edge of the etching compensation circle is located at the apex of the line corner.

[0007] As a preferred embodiment of this utility model, the line angle of the wiring is a right angle.

[0008] As a preferred embodiment of this utility model, the copper thickness of the trace is 1 oz to 5 oz, and the diameter of the etched compensation circle is 0.5 mm to 0.6 mm.

[0009] Preferably, the copper thickness of the trace is 1 oz and the diameter of the etch compensation circle is 0.5 mm.

[0010] Preferably, the copper thickness of the trace is 2 oz, and the diameter of the etched compensation circle is 0.525 mm.

[0011] Preferably, the copper thickness of the trace is 3 oz, and the diameter of the etched compensation circle is 0.55 mm.

[0012] Preferably, the copper thickness of the trace is 4 oz, and the diameter of the etched compensation circle is 0.575 mm.

[0013] Preferably, the copper thickness of the trace is 5 oz, and the diameter of the etched compensation circle is 0.6 mm.

[0014] As a preferred embodiment of this utility model, the trace with line angles includes a thin line segment in the middle and thick line segments at both ends of the thin line segment, and each thick line segment has two line angles at one end adjacent to the thin line segment.

[0015] The advantages of this utility model based on the above solution are as follows:

[0016] This invention establishes an etching compensation circle on the trace with a corner, with the center of the circle located inside the trace and the edge located at the apex of the corner. This etching compensation circle forms an additional compensation area at the corner, allowing the etching solution to preferentially etch the compensation area during the etching process. This offsets the amount of etching done on the corner area, reducing the deformation of the corner caused by etching and preventing the originally rectangular corner from being etched into an arc shape. This ensures that the etched corner closely resembles the shape of the original design, improving the functionality of the RF line and meeting the requirements of high-end RF circuits for graphic accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 for Figure 1 Enlarged view of section A;

[0019] Figure 3 This is a schematic diagram of the trace with the line corner of this utility model after etching.

[0020] In the diagram,

[0021] 1. PCB board; 2. Trace; 3. Etching area; 4. Etching compensation circle. Detailed Implementation

[0022] To better understand the purpose, technical solution, and technical effects of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will provide further explanation. 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 further definition and explanation in subsequent drawings. It is also stated that the embodiments described below are only for explaining this utility model and are not intended to limit it.

[0023] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intermediate component.

[0024] The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art, and is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element 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. The term "several" means two or more, unless otherwise expressly and specifically defined.

[0025] like Figures 1 to 3 As shown, a line corner etching protection structure for a PCB circuit board includes a PCB board 1. The PCB board 1 serves as the base carrier. The traces 2 on the board are formed by applying etching solution to non-trace areas (i.e., etching areas 3). For some traces 2 with line corners, an etching compensation circle 4 is set at the line corner, and the center of the etching compensation circle 4 is located inside the trace 2. The edge of the etching compensation circle 4 is aligned with the apex of the line corner.

[0026] During the PCB etching process, etching solution acts on etching area 3 to form trace 2. During this process, the solution irregularly etches the corner areas of trace 2, especially the sharp corners, where excessive etching can cause what should be rectangular corners to become rounded. The etching compensation circle 4 forms an additional compensation portion at the corners. During etching, the solution preferentially etches the area of ​​this compensation circle that protrudes beyond the original corner. This pre-set compensation precisely offsets the excessive etching of adjacent areas by the solution, ensuring that the corners maintain a rectangular shape close to the customer's original design after etching.

[0027] As can be seen, this utility model effectively solves the problem of line corner rounding caused by irregular etching of chemicals in the existing etching process, ensuring the accurate shape of the line corners of high-end RF lines, thereby improving the functional stability of RF lines and meeting the requirements of high-end RF circuit PCB pattern etching process for line accuracy.

[0028] In this invention, the trace 2 with corners includes a thin line segment in the middle and thick line segments at both ends of the thin line segment. Each thick line segment has two corners adjacent to one end of the thin line segment, so the trace has a total of 4 corners that need to be compensated. By setting etching compensation circles 4 that meet the above position requirements for each of the 4 corners, it can be ensured that each corner receives accurate etching compensation, effectively counteracting the irregular etching of each corner by the etching solution, so that all corners can maintain a near-rectangular shape after etching.

[0029] This invention not only effectively solves the problem of rectangular line corners being etched into rounded shapes in existing etching processes, but also, because the center of the etching compensation circle 4 is located inside the trace 2, and the edge of the etching compensation circle 4 is aligned with the apex of the line corner, the etching compensation circle 4 extends reasonably only within the trace itself, without excessively encroaching on the space outside the trace. Simultaneously, it effectively avoids the narrowing of the line spacing caused by the etching compensation circle 4 protruding excessively. For example, in the aforementioned trace structure combining a thin line segment with two thick line segments, at the complex structure where the thin and thick line segments connect, it can prevent the reduction of the line spacing between adjacent line segments due to excessive protrusion of the etching compensation circle, thus preventing risks such as signal interference or short circuits caused by insufficient line spacing.

[0030] In a preferred embodiment, the corner of trace 2 is a right angle, meaning the two sides of the corner are perpendicular to each other, forming a 90° angle, thus creating a regular right-angle structure. By setting an etching compensation circle for the right-angle corner, the regularity of the corner can be maintained more effectively, ensuring that the corner retains a clear right-angle feature after etching. In other optional embodiments, the corner can also be an acute or obtuse angle, but the difference between an acute or obtuse angle and a right angle is less than 10°.

[0031] In this invention, the copper thickness of trace 2 is 1 oz to 5 oz, and the diameter of the etching compensation circle 4 is 0.5 mm to 0.6 mm. When the copper thickness changes, the size of the etching compensation circle is adjusted by a corresponding coefficient to increase the compensation amount. During the etching process, different copper thicknesses lead to differences in the etching degree of the etching solution—the thicker the copper layer, the more copper the etching solution needs to etch, and the etching amount on the trace, especially at the corners, will also increase accordingly. If the compensation amount is fixed, a thicker copper layer may still have the problem of corner rounding due to insufficient compensation. Specifically, there is a linear adjustment relationship between the copper thickness of trace 2 and the diameter of the etching compensation circle 4. For every 1 oz increase in copper thickness, the diameter of the compensation circle increases by 0.025 mm, as shown in the following relationship:

[0032] In one specific embodiment, the copper thickness of trace 2 is 1 oz, and the diameter of the etch compensation circle 4 is 0.5 mm.

[0033] In one specific embodiment, the copper thickness of trace 2 is 2 oz, and the diameter of the etch compensation circle 4 is 0.525 mm.

[0034] In one specific embodiment, the copper thickness of trace 2 is 3 oz, and the diameter of the etch compensation circle 4 is 0.55 mm.

[0035] In one specific embodiment, the copper thickness of trace 2 is 4 oz, and the diameter of the etch compensation circle 4 is 0.575 mm.

[0036] In one specific embodiment, the copper thickness of trace 2 is 5 oz, and the diameter of the etch compensation circle 4 is 0.6 mm.

[0037] As can be seen, the design of precisely matching the diameter of the etching compensation circle according to the copper thickness gradient ensures that traces of different copper thicknesses can obtain just the right amount of compensation during corner etching. For example, for a 1oz copper thickness trace, an etching compensation circle with a diameter of 0.5mm can offset the normal etching of the corner at that copper thickness, avoiding over-compensation that would lead to abnormal corner shape. When the copper thickness reaches 5oz, an etching compensation circle with a diameter of 0.6mm can accommodate greater etching requirements, preventing the corner from being etched into an arc due to insufficient compensation.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A line corner etching protection structure for a PCB circuit board, characterized in that: Includes a PCB board (1), on which several traces (2) are provided, and the gap between different traces is an etching area (3); some traces (2) have line corners, and the traces (2) with line corners have etching compensation circles (4) at their line corners; and the center of the etching compensation circle (4) is located inside the trace (2), and the edge of the etching compensation circle (4) is located at the top corner of the line corner.

2. The PCB circuit board line corner etching protection structure according to claim 1, characterized in that: The angle of the line (2) is a right angle.

3. The PCB circuit board line corner etching protection structure according to claim 1, characterized in that: The copper thickness of the trace (2) is 1 oz to 5 oz, and the diameter of the etched compensation circle (4) is 0.5 mm to 0.6 mm.

4. The line corner etching protection structure for a PCB circuit board according to claim 3, characterized in that: The copper thickness of the trace (2) is 1 oz, and the diameter of the etched compensation circle (4) is 0.5 mm.

5. The line corner etching protection structure for a PCB circuit board according to claim 3, characterized in that: The copper thickness of the trace (2) is 2oz, and the diameter of the etched compensation circle (4) is 0.525mm.

6. The line corner etching protection structure for a PCB circuit board according to claim 3, characterized in that: The copper thickness of the trace (2) is 3oz, and the diameter of the etched compensation circle (4) is 0.55mm.

7. The line corner etching protection structure for a PCB circuit board according to claim 3, characterized in that: The copper thickness of the trace (2) is 4 oz, and the diameter of the etched compensation circle (4) is 0.575 mm.

8. The line corner etching protection structure for a PCB circuit board according to claim 3, characterized in that: The copper thickness of the trace (2) is 5oz, and the diameter of the etched compensation circle (4) is 0.6mm.

9. The line corner etching protection structure for a PCB circuit board according to claim 1, characterized in that: The trace with line angles (2) includes a thin line segment in the middle and thick line segments at both ends of the thin line segment. Each thick line segment has two line angles at one end adjacent to the thin line segment.

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