Device for monitoring quality of back drilling hole printed circuit board

Abstract

The utility model relates to the technical field of printed circuit board processing, in particular to a device for monitoring the quality of a back-drilled printed circuit board, which comprises an auxiliary printed circuit board assembly and a printed circuit board to be back-drilled. Wherein the printed circuit board to be back-drilled is used for being back-drilled into a standard back-drilled printed circuit board, and the standard back-drilled printed circuit board is a printed circuit board back-drilled to the Nth layer; the Nth layer of the auxiliary printed circuit board assembly is connected with the Nth layer of the printed circuit board to be back-drilled through a test line, and the (N + 1) th layer of the auxiliary printed circuit board assembly is connected with the (N + 1) th layer of the printed circuit board to be back-drilled through a test line. The device for monitoring the quality of the back drilling hole printed circuit board is simple in structure and convenient to detect, the efficiency of the detection process can be improved, and the detection cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of printed circuit board processing, and particularly relates to a device for monitoring the quality of back-drilled printed circuit boards. Background Art

[0002] Back drilling is one of the most common production techniques in high-speed printed circuit board production. The quality of back drilling is generally judged by the depth of back drilling, and the depth of back drilling is often measured by the method of metallographic sectioning. When technicians in this field perform metallographic sectioning, they usually need steps such as sampling - resin embedding - grinding - measurement, etc. The time required for the whole process is at least 0.5 hours, which is quite time-consuming.

[0003] Therefore, it is crucial to provide a device for monitoring the quality of back-drilled printed circuit boards that can solve the above problems. Summary of the Utility Model

[0004] In order to solve the above problems, the purpose of the utility model is to provide a device for detecting the quality of back-drilled printed circuit boards. By using Ohm's law, a connection between two points means a short circuit, and the disconnection of two points after back drilling means an open circuit.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] The first purpose of the utility model is to provide a device for monitoring the quality of back-drilled printed circuit boards, including an auxiliary printed circuit board assembly and a printed circuit board to be back-drilled.

[0007] Among them, the printed circuit board to be back-drilled is used to be back-drilled into a standard back-drilled printed circuit board, and the standard back-drilled printed circuit board is a printed circuit board back-drilled to the Nth layer.

[0008] The Nth layer of the auxiliary printed circuit board assembly is connected to the Nth layer of the printed circuit board to be back-drilled through a test line, and the (N + 1)th layer of the auxiliary printed circuit board assembly is connected to the (N + 1)th layer of the printed circuit board to be back-drilled through a test line.

[0009] In an embodiment of the utility model, the auxiliary printed circuit board assembly includes more than one auxiliary printed circuit board.

[0010] In an embodiment of the utility model, the auxiliary printed circuit board assembly includes two auxiliary printed circuit boards: the first auxiliary printed circuit board and the second auxiliary printed circuit board.

[0011] In an embodiment of the utility model, the auxiliary printed circuit board has the same number of layers as the printed circuit board to be back-drilled.

[0012] In an embodiment of the present utility model, the Nth layer of the first auxiliary printed circuit board is connected to the Nth layer of the printed circuit board to be back-drilled through a first test line; the (N + 1)th layer of the second auxiliary printed circuit board is connected to the (N + 1)th layer of the printed circuit board to be back-drilled through a second test line.

[0013] In an embodiment of the present utility model, the first auxiliary printed circuit board, the second auxiliary printed circuit board, and the printed circuit board to be back-drilled are arranged in a "V" shape.

[0014] In an embodiment of the present utility model, the lengths of the first test line and the second test line are the same or different.

[0015] In an embodiment of the present utility model, the lengths of the first test line and the second test line are the same.

[0016] In an embodiment of the present utility model, the diameters of the first test line and the second test line are the same.

[0017] In an embodiment of the present utility model, the diameters of the first test line and the second test line are 0.12 - 0.17 mm.

[0018] In an embodiment of the present utility model, the device includes a multimeter for detecting the resistance of the first test line and the second test line.

[0019] Compared with the prior art, the present utility model has the following beneficial effects:

[0020] The device for monitoring the quality of the back-drilled printed circuit board of the present utility model has a simple structure, is convenient to detect, can improve the efficiency of the detection process, and can also reduce the detection cost. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the device for monitoring the quality of the back-drilled printed circuit board in Embodiment 1;

[0022] Figure 2 It is a schematic structural diagram of the first test line, the first auxiliary printed circuit board, and the printed circuit board to be back-drilled in Embodiment 1;

[0023] Figure 3 It is a schematic structural diagram of the second test line, the second auxiliary printed circuit board, and the printed circuit board to be back-drilled in Embodiment 1;

[0024] Explanation of the reference numerals in the figure: 1. Printed circuit board to be back-drilled; 2. First auxiliary printed circuit board; 3. Second auxiliary printed circuit board; 4. First test line; 5. Second test line; 6. Nth layer; 7. (N + 1)th layer. Detailed Embodiment

[0025] The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0028] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0029] In the following embodiments, unless otherwise specified, the structures are all conventional structures in the art, and the detection methods and means used are all conventional methods and means in the art.

[0030] Embodiment 1

[0031] This embodiment provides a device for monitoring the quality of a back-drilled printed circuit board, as Figure 1 shown, which includes an auxiliary printed circuit board assembly, a printed circuit board 1 to be back-drilled, and a multimeter; wherein, the printed circuit board 1 to be back-drilled is used to be back-drilled into a standard back-drilled printed circuit board, and the standard back-drilled printed circuit board is a printed circuit board back-drilled to the Nth layer 6; the auxiliary printed circuit board has the same number of layers as the printed circuit board 1 to be back-drilled;

[0032] Wherein, as Figure 2 and Figure 3As shown in the figure, the auxiliary printed circuit board assembly includes a first auxiliary printed circuit board 2 and a second auxiliary printed circuit board 3. The arrangement of the first auxiliary printed circuit board 2, the second auxiliary printed circuit board, and the printed circuit board 1 to be back-drilled is in a "V" shape (which is convenient for the measurement of a multimeter). The Nth layer 6 of the first auxiliary printed circuit board 2 is connected to the Nth layer 6 of the printed circuit board 1 to be back-drilled through a first test line 4. The (N + 1)th layer 7 of the second auxiliary printed circuit board 3 is connected to the (N + 1)th layer 7 of the printed circuit board 1 to be back-drilled through a second test line 5 (also according to the situation, the auxiliary printed circuit board assembly may be provided with more than one auxiliary printed circuit board. For example, when there is one, the Nth layer 6 of the auxiliary printed circuit board is connected to the Nth layer 6 of the printed circuit board 1 to be back-drilled through a test line, and the (N + 1)th layer 7 of the auxiliary printed circuit board is connected to the (N + 1)th layer 7 of the printed circuit board 1 to be back-drilled through a test line).

[0033] Furthermore, the lengths of the first test line 4 and the second test line 5 are the same (it can also be adjusted according to the actual situation, and different lengths are also possible).

[0034] The diameters of the first test line 4 and the second test line 5 are the same, which is 0.15 mm (it can be adjusted to 0.12 - 0.17 mm according to the actual situation).

[0035] Among them, a multimeter is used to detect the resistance of the first test line 4 and the second test line 5.

[0036] During use, back-drilling is performed on the printed circuit board 1 to be back-drilled. After the back-drilling is completed, turn on the multimeter, touch the two probes of the multimeter to the two ends of the first test line 4 respectively, and then touch the two probes to the two ends of the second test line 5 respectively.

[0037] Among them, when the detection result indicates that the first test line 4 is open and the second test is short-circuited, it is determined that the quality of the back-drilled printed circuit board is qualified.

[0038] When the detection result indicates that the first test line 4 is short-circuited and the second test is short-circuited, it is determined that the back-drilled printed circuit board needs to be back-drilled continuously.

[0039] When the detection result indicates that the first test line 4 is open and the second test is open, it is determined that the quality of the back-drilled printed circuit board is unqualified.

[0040] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the utility model. It is obvious that those who are familiar with the technology in this field can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art according to the interpretation of the present utility model without departing from the scope of the present utility model should be within the protection scope of the present utility model.

Claims

1. A device for monitoring the quality of back-drilled printed circuit boards, characterized in that, It includes an auxiliary printed circuit board assembly and a printed circuit board to be back-drilled (1). Among them, the printed circuit board to be back-drilled (1) is used to be back-drilled into a standard back-drilled printed circuit board, and the standard back-drilled printed circuit board is a printed circuit board back-drilled to the Nth layer (6). The Nth layer (6) of the auxiliary printed circuit board assembly is connected to the Nth layer (6) of the printed circuit board to be back-drilled (1) through a test line, and the (N + 1)th layer (7) of the auxiliary printed circuit board assembly is connected to the (N + 1)th layer (7) of the printed circuit board to be back-drilled (1) through a test line.

2. The device for monitoring the quality of back-drilled printed circuit boards according to claim 1, wherein The auxiliary printed circuit board assembly includes more than one auxiliary printed circuit board.

3. A device for monitoring the quality of back-drilled printed circuit boards according to claim 1, characterized in that, The auxiliary printed circuit board assembly includes two auxiliary printed circuit boards: a first auxiliary printed circuit board (2) and a second auxiliary printed circuit board (3).

4. The device for monitoring the quality of a back-drilled printed circuit board according to claim 3, wherein, The Nth layer (6) of the first auxiliary printed circuit board (2) is connected to the Nth layer (6) of the printed circuit board to be back-drilled (1) through a first test line (4); the (N + 1)th layer (7) of the second auxiliary printed circuit board (3) is connected to the (N + 1)th layer (7) of the printed circuit board to be back-drilled (1) through a second test line (5).

5. The device for monitoring the quality of a back-drilled printed circuit board according to claim 4, wherein The first auxiliary printed circuit board (2), the second auxiliary printed circuit board (3) and the printed circuit board to be back-drilled (1) are arranged in a "V" shape.

6. The device for monitoring the quality of a back-drilled printed circuit board according to claim 4, characterized in that, The lengths of the first test line (4) and the second test line (5) are the same or different.

7. The device for monitoring the quality of back-drilled printed circuit boards according to claim 6, characterized in that, The lengths of the first test line (4) and the second test line (5) are the same.

8. The device for monitoring the quality of back - drilled printed circuit boards according to claim 4, characterized in that, The diameters of the first test line (4) and the second test line (5) are the same.

9. The device for monitoring the quality of a back-drilled printed circuit board according to claim 8, characterized in that, The diameters of the first test line (4) and the second test line (5) are 0.12 - 0.17 mm.

10. The device for monitoring the quality of a back-drilled printed circuit board according to claim 4, wherein, The device includes a multimeter for detecting the resistance of the first test line (4) and the second test line (5).

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