CN108901128B

CN108901128B - Double-sided flexible PCB

Info

Publication number: CN108901128B
Application number: CN201810977295.6A
Authority: CN
Inventors: 陈赵军
Original assignee: Shenzhen Huaqiu Electronics Co ltd
Current assignee: Shenzhen Huaqiu Electronics Co.,Ltd.
Priority date: 2018-08-26
Filing date: 2018-08-26
Publication date: 2021-12-28
Anticipated expiration: 2038-08-26
Also published as: CN108901128A

Abstract

The invention discloses a double-sided flexible PCB (printed circuit board), which comprises a main line board, a main line, a test point, a fixing hole position, an interface, a base material and a protective film, wherein the upper surface and the lower surface of the main line board are attached with a layer of protective film, and the base material is arranged in the middle of the main line board; in the plane layout, one end of the main line board is provided with a plurality of fixing hole positions, the middle part of the main line board is provided with a plurality of main lines, two test lines are also arranged, the other end of the main line board is provided with an interface, and the test points are arranged at two ends of each test line; according to the invention, by adding the test circuit with the folding endurance slightly lower than that of copper, whether the folding endurance of the whole flexible circuit board affects the performance can be judged, so that bad products are removed. In addition, the improvement of the hole positions can further improve the stability of the flexible circuit board on the fixed connection.

Description

Double-sided flexible PCB

Technical Field

The invention relates to the technical field of electronics, in particular to a double-sided flexible PCB with enhanced connection stability and capable of eliminating a circuit board with the longest service life.

Background

The flexible printed circuit board is a flexible printed circuit board which is made of polyimide or polyester film as a base material and has high reliability and excellent flexibility, and has the characteristics of high wiring density, light weight, thin thickness and good bending property.

The multilayer flexible circuit board has the advantages of high assembly density, small volume and light weight, and because high-density assembly and connection lines among components (including parts) are reduced, the reliability is improved; the wiring layer can be increased, and then the design elasticity is increased; the impedance of the circuit can be formed, a certain high-speed transmission circuit can be formed, the circuit and the electromagnetic shielding layer can be set, and a metal core layer can be arranged to meet the functions and requirements of special thermal insulation and the like; the installation is convenient, the reliability is high.

The flexible board has the advantages that the flexible board can be assembled to a place needing bending, but the performance of the flexible board is influenced by the bending times and the environment, the flexible board cannot be repeatedly used in many cases, and the flexible board can be designed into a relatively simple circuit. At present, the design of a plurality of circuits is designed based on the existing packaging device, the welding of the device on the flexible plate can also have problems, the flexibility of the plate is ensured, the good welding of the device is also ensured, and the contradiction exists between the two.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the double-sided flexible PCB, and by adding the test circuit with the folding endurance slightly lower than that of copper, whether the folding endurance of the whole flexible PCB affects the performance can be judged, so that bad products are removed. In addition, the improvement of the hole positions can further improve the stability of the flexible circuit board on the fixed connection.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention comprises a main line board, a main line, a test point, a fixing hole position, an interface, a base material and a protective film. A layer of protective film is attached to the upper surface and the lower surface of the main line board, and a base material is arranged in the middle of the main line board; on the plane layout, one end on the main line board is provided with a plurality of fixing hole positions, the middle part is provided with a plurality of main lines, two test lines are further arranged, the other end on the main line board is provided with an interface, and the test points are arranged at two ends of each test line.

Further, the main line board comprises a corner board and a T-shaped board.

Further, the main circuit material is copper.

Further, the test circuit material is mixed metal of copper and iron.

Furthermore, the test circuit is an independent circuit during implementation and does not participate in electrical connection.

Further, the shapes of the fixing hole positions comprise a triangle and a rectangle.

Further, the protective film is made of a PI film and polyester adhesive.

The invention has the beneficial effects that certain products needing the flexible circuit board in the traditional technology need to be continuously bent, but the performance of the flexible circuit board can be influenced by excessive bending. In addition, the improvement of the hole positions can further improve the stability of the flexible circuit board on the fixed connection.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural view of an embodiment of the main line board of the invention as a corner board.

FIG. 3 is a schematic view of the connection structure of the substrate and the protective film according to the present invention.

In the figure:

1. a main line board;

2. a main line;

3. testing the circuit;

4. testing points;

5. fixing hole positions;

6. an interface;

7. a substrate;

8. and (5) protecting the film.

Detailed Description

In the embodiment shown in fig. 1-3, the invention comprises a main line board 1, a main line 2, a test line 3, a test point 4, a fixing hole site 5, an interface 6, a substrate 7 and a protective film 8. A layer of protective film 8 is attached to the upper surface and the lower surface of the main line board 1, and a base material 7 is arranged in the middle of the main line board 1; on the planar layout, the one end on the main line board 1 is equipped with a plurality of fixed hole sites 5, and the middle part is equipped with a plurality of main lines 2, still is equipped with two test line 3, and the other end on the main line board 1 is equipped with an interface 6, and test point 4 sets up the both ends at each test line 3.

Specifically, the main line board 1 includes a corner board and a T-shaped board. Specifically, the main line 2 material is copper. Specifically, the test circuit 3 is made of copper-iron mixed metal, and the test circuit 3 is an independent circuit in implementation and does not participate in electrical connection.

Specifically, the shapes of the fixing hole positions 5 include a triangle and a rectangle; the protective film 8 is made of PI film and polyester adhesive.

In specific implementation, the main line board 1 is a T-shaped board. The fixing hole positions 5 of the main line board are two and rectangular in shape, when the PCB is fixed, the fixing hole positions 5 are required to be aligned with the rectangular bulges on the periphery of the screw holes, and then screws are screwed. Compared with the traditional round hole, the rectangular hole position of the invention ensures that the connection is more stable, and even if one screw falls off due to various reasons, the direction of the circuit board can not be changed, thereby greatly enhancing the connection stability of the circuit board.

The flexible circuit board 1 has two circuits, the main circuit 2 is made of a traditional copper wire, the test circuit 3 is made of a copper wire which is mixed with iron, and the folding endurance of the copper wire which is mixed with the iron is slightly inferior to that of the copper wire due to the poor folding endurance of the iron.

The bending times of the main line 2 are about ten thousand, and according to the bending times and the performance evaluation table, the performance of the main line is deteriorated due to the fact that the service life of the main line is about to be exhausted after being bent for 9000 times, and the bending times of the test line is about 9000 times, so that the test line 3 can be used as a basis for judging the performance of the main line, the test point 4 can be used for measuring the test line, a universal meter can be used for measuring during specific implementation, if the measurement result is a path, the main line board 1 can work well and can be used continuously, if the test result is an open circuit, the service life of the main line board 1 is all the time, the performance is deteriorated, and the main line board 1 can be replaced as soon as possible, and unnecessary loss is avoided.

The test lines 4 are two in total and can be used as a safety device to prevent error prediction. A layer of protective film is attached to the surface of the main line plate, and the protective film 8 is made of a PI film and polyester adhesive. The Pi film is a film-type insulating material with the best performance and is formed by polycondensation, film-forming and imidization of pyromellitic dianhydride (PMDA) and diaminodiphenyl ether (DDE) in a strong polar solvent. The polyester is a general term for a polymer obtained by polycondensation of a polyhydric alcohol and a polybasic acid. Mainly polyethylene terephthalate, and conventionally also polybutylene terephthalate. Is an engineering plastic with excellent performance and wide application.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are illustrative and not exclusive in all respects. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.

Claims

1. The utility model provides a two-sided flexible PCB board which characterized by: the device comprises a main line board, a main line, a test point, a fixing hole position, an interface, a substrate, a PI film and a polyester adhesive protective film, wherein a layer of PI film and a polyester adhesive protective film are attached to the upper surface and the lower surface of the main line board, and the substrate is arranged in the middle of the main line board; in the plane layout, one end of the main line board is provided with a plurality of fixing hole positions, the middle part of the main line board is provided with a plurality of main lines, two test lines are also arranged, the other end of the main line board is provided with an interface, and the test points are arranged at two ends of each test line; the main line material is copper; the test circuit material is mixed metal of copper and iron.

2. A double-sided flexible PCB as recited in claim 1, wherein: the main line board comprises a T-shaped board.

3. A double-sided flexible PCB as recited in claim 1, wherein: the test circuit is an independent circuit during implementation and does not participate in electrical connection.

4. A double-sided flexible PCB as recited in claim 1, wherein: the shape of the fixing hole position comprises a triangle or a rectangle.