Circuit board capable of preventing burrs in hole

Abstract

The utility model relates to the technical field of circuit boards, in particular to a circuit board capable of preventing burrs in holes, which comprises a plurality of layers of core boards, tightening and supporting sheets are arranged among the plurality of layers of core boards, the tightening and supporting sheets are pre-embedded at the positions of conducting holes of the core boards, preformed holes are arranged in the middles of the tightening and supporting sheets, and the preformed holes and the conducting holes are identical in structure. According to the utility model, burrs of the via holes of the circuit board can be prevented, the thickness of the area, needing to be drilled, of the circuit board can be larger than that of other areas by arranging the tight supporting sheets among the multiple layers of core boards, the thickness of the area, needing to be drilled, of the circuit board can be reduced, and the production efficiency is improved. And the part is in a higher pressure and tightening state in the pressing process, so that the stress of the core plate in the subsequent drilling process is more stable, the vibration in the drilling process is reduced, and burrs are prevented.

Description

Technical Field

[0001] The present application relates to the technical field of circuit boards, and in particular to a circuit board capable of preventing burrs in holes. Background Art

[0002] Circuit boards are the support for electronic components and the carrier for electrical connections of electronic components. Through circuit boards, electronic components can be densely arranged, signal interference can be reduced, circuit performance can be improved, and large-scale production and assembly can be facilitated. Circuit boards are widely used in various electronic devices, such as computers, communication equipment, consumer electronics, etc.

[0003] Multilayer circuit boards are more prone to burrs in the holes due to the increase in the number of layers. Especially when the thickness of the circuit board is required, the thinner the circuit board, the more sensitive it is to force. The material that is not cut off during the drilling process is pushed out and deformed under the pressure of the drill bit, which makes burrs more likely to appear. This project aims to develop a circuit board that prevents burrs in the holes to solve the problem. Utility Model Content

[0004] In view of at least one of the above technical problems, the present application provides a circuit board for preventing burrs in holes, and adopts the following technical solution to solve the problem.

[0005] According to one aspect of the present application, there is provided a circuit board for preventing burrs in holes, comprising: a multi-layer core board, wherein tight support plates are arranged between the multi-layer core boards, the tight support plates are pre-buried in the positions of the conductive holes of the core boards, a reserved hole is arranged in the middle of the tight support plates, and the reserved hole has the same structure as the conductive hole.

[0006] The utility model is further configured such that the shape of the tight support sheet is adapted to the shape of the conducting hole.

[0007] The utility model is further configured that the tight support piece is circular.

[0008] The utility model is further configured that the tight support piece is rectangular.

[0009] The utility model is further configured such that the size of each side of the tight support sheet is larger than the size of each side of the conducting hole.

[0010] The utility model is further configured such that the maximum size of the tight support piece is smaller than half of the hole distance of the conducting holes on the core plate.

[0011] The utility model is further configured that the tight support pieces are connected by connecting strips to form a whole.

[0012] The utility model is further configured that the connecting bar is a straight line structure.

[0013] The utility model is further configured that the tight support piece is integrally connected with a positioning piece, and a positioning hole is provided on the positioning piece.

[0014] The utility model is further configured that the number of the positioning pieces is not less than two.

[0015] This application has the following technical effects:

[0016] The utility model can prevent burrs on the conductive holes of the circuit board. By arranging tight support sheets between the multi-layer core boards, the thickness of the area of ​​the circuit board that needs to be drilled can be made thicker than other areas. During the pressing process, this part is under higher pressure and tension, so that the core board is more stably stressed during the subsequent drilling process, thereby reducing vibration during the drilling process and preventing burrs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a cross-sectional view of the present application;

[0019] Figure 2 It is a top view in this application.

[0020] Reference numerals:

[0021] 1. Core board; 11. Conductive hole; 2. Tightening plate; 21. Reserved hole; 22. Connecting strip; 23. Positioning plate. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are explained to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below. For example, terms such as "tightening sheet" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0023] Embodiment 1

[0024] In this embodiment of the present application, Figure 1-Figure 2As shown, a circuit board for preventing burrs in holes is provided, comprising: a multi-layer core board 1, a tight support sheet 2 is arranged between the multi-layer core boards 1, the thickness of the tight support sheet 2 can be set to be equal to the thickness of the copper foil layer, such as 20-30μm, the tight support sheet 2 is pre-buried at the position of the through hole 11 of the core board 1, the through hole 11 includes a through hole and a blind hole, a reserved hole 21 is arranged in the middle of the tight support sheet 2, and the reserved hole 21 has the same structure as the through hole 11; since the thinner multi-layer circuit board is sensitive to force, it is more likely to vibrate during the drilling process, resulting in uncut materials being squeezed by the drill bit. The pressing and pushing out causes deformation and burrs. The tensioning sheet 2 is arranged before drilling holes in the multi-layer core board 1. During the pressing process of the multi-layer core board 1, the tensioning sheet 2 is pressed at the position where holes need to be drilled, so that the thickness of this area is greater than that of other areas. During the pressing process, this part is under higher pressure and tension, so that the core board 1 can be more stably stressed during the subsequent drilling process, reduce vibration during the drilling process, and prevent burrs. At the same time, since the tensioning sheet 2 is only supported at the position of the through hole 11, other areas are still connected by hot pressing with the glue layer, and the overall thickness of the circuit board can still be kept thin.

[0025] Considering that the shape of the via hole 11 may be irregular, the shape of the support sheet 2 is adapted to the shape of the via hole 11 , so that the support sheet 2 can better cover the area where the via hole 11 is located.

[0026] The size of each side of the support sheet 2 is larger than the size of each side of the conductive hole 11. For example, if the conductive hole 11 is a rectangle, the four sides of the support sheet 2 are set to be larger than the four sides of the rectangle to ensure that the area where the conductive hole 11 is located can be covered.

[0027] In order to avoid mutual interference between the support sheets 2, the maximum size of the support sheets 2 is smaller than half of the hole pitch of the conducting holes 11 on the core board 1, so as to ensure uniform thickness after support.

[0028] Embodiment 2

[0029] This second embodiment is based on the first embodiment and is another implementation method of the tight support sheet 2. Figure 1 and Figure 2 The tight support piece 2 is circular, and the circular tight support piece 2 can bear the force evenly.

[0030] Embodiment 3

[0031] The third embodiment is based on the first embodiment and is another implementation method of the tight support sheet 2 . The tight support sheet 2 is rectangular and not shown in the figure. The rectangular tight support sheet 2 can be adapted to the rectangular conducting hole 11 .

[0032] Embodiment 4

[0033] This embodiment 4 is an improved implementation method based on the embodiment 1. Figure 2The tight support sheets 2 are connected to form a whole through the connecting strips 22. Through the overall structural design, the tight support sheets 2 can be assembled as a whole to improve production efficiency; the connecting strips 22 are a straight line structure with the shortest straight line distance, which can avoid increasing the thickness of the circuit board as much as possible.

[0034] Embodiment 5

[0035] This embodiment 5 is an improved implementation method based on the embodiment 1. Figure 2 The whole of the tight support piece 2 is connected with a positioning piece 23, and a positioning hole is provided on the positioning piece 23. The positioning hole is used for positioning during the assembly process to ensure that the tight support piece 2 is aligned with the conductive hole 11 of the core plate 1.

[0036] The number of the positioning pieces 23 is not less than two, and more positioning pieces 23 can improve the positioning accuracy.

[0037] The above are only preferred embodiments of the present application, and do not constitute any formal limitation on the present application. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment of equivalent changes. Therefore, all equivalent changes made according to the shape, structure and principle of the present application without departing from the content of the technical solution of the present application should be included in the protection scope of the present application.

Claims

1. A circuit board for preventing burrs in holes, characterized in that: include: A multi-layer core plate (1) is provided, characterized in that: a tightening plate (2) is provided between the multiple layers of the core plate (1), the tightening plate (2) is pre-buried in the position of the conductive hole (11) of the core plate (1), a reserved hole (21) is provided in the middle of the tightening plate (2), and the reserved hole (21) has the same structure as the conductive hole (11).

2. A circuit board for preventing burrs in holes according to claim 1, characterized in that: The shape of the tight support sheet (2) is matched to the shape of the conducting hole (11).

3. A circuit board for preventing burrs in holes according to claim 1, characterized in that: The tight support piece (2) is circular.

4. A circuit board for preventing burrs in holes according to claim 1, characterized in that: The tight support sheet (2) is rectangular.

5. A circuit board for preventing burrs in holes according to claim 1, characterized in that: The size of each side of the tight support sheet (2) is greater than the size of each side of the conducting hole (11).

6. A circuit board for preventing burrs in holes according to claim 1, characterized in that: The maximum size of the tight support sheet (2) is less than half of the hole pitch of the conducting holes (11) on the core plate (1).

7. A circuit board for preventing burrs in holes according to claim 1, characterized in that: The tightening plates (2) are connected to each other via a connecting strip (22) to form a whole.

8. A circuit board for preventing burrs in holes according to claim 7, characterized in that: The connecting strip (22) is a straight line structure.

9. A circuit board for preventing burrs in holes according to claim 1, characterized in that: The integral part of the tight support piece (2) is connected to a positioning piece (23), and a positioning hole is provided on the positioning piece (23).

10. A circuit board for preventing burrs in holes according to claim 9, characterized in that: The number of the positioning pieces (23) is no less than two.

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