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Rigid Flex PCB

Rigid Flex PCB

Rigid Flex PCB

Rigid Flex PCB

How is Rigid-Flex PCB(R-FPCB) Fabrication?

Rigid-Flex PCB (R-FPCB) is derived from the development of FPC and PCB. 

Therefore, Rigid-Flex PCB is flexible PCB and rigid PCB. After pressing and other processes, they are combined according to relevant process requirements to form a PCB with FPC characteristics and PCB characteristics.


Because Rigid-Flex PCB is a combination of FPC and PCB, the production of Rigid-Flex PCB should have both FPC production equipment and PCB fabrication equipment. First, the electronic engineer draws the circuit and shape of the flexible PCB board according to the needs, and then sends it to the factory that can produce Rigid-Flex PCB. The CAM engineer processes and plans the relevant documents, and then arranges the FPC production line production site FPC and PCB production lines are required to produce PCB. After these two FPC boards and PCB boards come out, according to the planning requirements of the electronic engineer, the FPC and PCB are seamlessly pressed by a pressing machine, and then a series of details are passed through. Became Rigid-Flex PCB. A very important link, because Rigid-Flex PCB is difficult and there are many details. It is generally inspected before shipment. Because of its high value, so as to avoid loss of related benefits to both the supplier and the demander.


Advantages of Rigid-Flex PCB

1. High impact and high vibration environment. Rigid-Flex PCB has high impact resistance, and can be applied in a high-stress environment and ensure stable equipment performance, otherwise it will cause equipment failure.

2. High-precision applications where reliability is more important than cost considerations. If cable or connector failure is dangerous, it is better to use the more durable Rigid-Flex PCB.

3. High-density applications. Some components lack all the necessary connectors and the required surface area for cables. In this case, Rigid-Flex PCB can be used to save space to solve this problem.

4. Applications that require multiple rigid PCB boards. When the assembly is packed with more than four connection boards, replacing them with a single Rigid-Flex PCB may be the best option and more cost-effective.

Rigid-Flex PCB (R-FPCB)

Rigid-Flex PCB (R-FPCB)

Main applications of Rigid-Flex PCB:

1. Industrial use-Industrial use includes Rigid-Flex PCB boards used in industry and medical treatment. Most industrial parts require the characteristics of accuracy, safety, and resistance to soil damage. Therefore, the characteristics required for soft and hard boards are: high reliability, high precision, low impedance loss, complete signal transmission quality, and durability. But because the process is complicated, the cost is relatively high.

2. Cars-Rigid-Flex PCB boards in cars are commonly used to connect the buttons on the steering wheel to the motherboard, the connection of the car's video system screen and the control panel, the operation connection of the audio or function keys on the side door, and the reversing radar. Image system, sensors (Sensor, including air quality, temperature and humidity, special gas adjustment, etc.), vehicle communication system, satellite navigation, rear seat control panel and front-end controller connection board, vehicle exterior detection system, etc.

3. Consumer electronic products-among consumer products, DSC and DV are representative of the development of R-FPCB boards, and they can be discussed in two main axes: "performance" and "structure.

4. Mobile phone-the application of soft and hard boards in mobile phones, such as folding mobile phone turning point (Hinge), image module (Camera Module), keys (Keypad) and radio frequency module (RF Module), etc. are common. The advantages of using R-FPCB boards in mobile phones are the integration of parts in the mobile phone and the consideration of the amount of signal transmission.


Rigid-Flex PCB laminate process

Even if the positioning holes are punched with OPE, the single-chip processing before lamination has a great influence on the alignment between layers.

We should pay attention to three aspects when handling the PCB hard board part:

1. Regardless of whether it is substrate pressing or pure prepreg pressing, it is important to note that the warp and weft directions of the glass cloth should be consistent, and the thermal stress should be eliminated during the pressing process to reduce warpage.

2. The PCB rigid board should have a certain thickness, because the flexible part of the PCB is very thin and has no glass cloth. After being affected by the environment and thermal shock, its changes are different from the rigid PCB part. If the rigid PCB part is not certain The difference in thickness or hardness will be obvious, and serious warpage will occur during use, which will affect welding and use. If the rigid part has a certain thickness or hardness, this difference may appear Insignificant, the overall flatness will not change with the change of the flexible part, which can ensure welding and use. If the rigid part is too thick, it will appear heavy and uneconomical. The experiment proves that the thickness of 0.8~1.0mm is more appropriate.

3. For the processing of flexible PCB windows, there are usually first milling and post milling methods to process, but it needs to be processed flexibly according to the structure and thickness of the Rigid-Flex PCB itself. If it is to mill the flexible window first The accuracy of the milling should be ensured, and neither the welding nor the deflection should be affected too much. The milling data can be produced by engineering, and the flexible window can be milled in advance. We don’t use milling and cutting of the flexible window first, and wait until we finish all the pre-processes and finally take shape and then use laser cutting to remove the waste of the flexible window. At this time, we must pay attention to the depth of the FR4 that the laser can cut.



Rigid-Flex PCB (R-FPCB) production process


1 Material selection

2 Production process and control of key parts

2.1 Production process

2.2 Graphic transfer of the inner monolithic

2.3 Multi-layer positioning of flexible materials

2.4 Laminating

2.5 Drilling

2.6 De-drilling and protruding corrosion

2.7 Electroless copper plating, copper electroplating

2.8 Surface solder mask and solderability protective layer

2.9 Shape processing

Rigid-Flex PCB (R-FPCB) production process


Rigid-flex PCB board is widely used, with the development of smart devices towards high integration, light weight, and miniaturization, as well as the new requirements of Industry 4.0 for personalized production. With its advantages and characteristics, the rigid-flex PCB board will definitely be able to show its talents in the future.