Rigid-Flex PCB

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What is the Rigid-Flex PCB

Rigid-flex boards are designed in 3D space and greater spatial efficiency is offered by 3D space. Owing to this, the designs of rigid-flex circuit boards is difficult than those of a typical rigid board. The ability to design in 3 dimensions gives designers a benefit that the flexible circuit board substrates can be twisted, folded and rolled in order to have their required shape for the applications. The Rigid-Flex PCB is a flexible printed circuit board and a rigid printed circuit board, which are combined by pressing processes and the like according to the relevant process requirements to form a printed circuit board having FPC characteristics and PCB characteristics.

Rigid-Flex PCBs Fabrication Applications

There are multiple applications that are offered by rigid-flex PCB. These include smart devices, cell phones, and digital cameras. Moreover, rigid-flex board fabrication has the capability to reduce their space and weight due to which these are used in smart control systems and medical devices, for instance, pacemakers.

Rigid-Flex circuits offer a great benefit in consumer products. It maximizes space along with maximizing the weight and improves reliability. This eliminates the needs for solder joints and wiring which are liable to create connection issues. However, these are only a few examples. Rigid-Flex PCBs benefit all electrical applications which include the modern ones as well such as equipment used for testing and automobiles.

From the discussion done so far, it can be concluded that rigid-flex circuits consist of flexible and rigid substrates which are covered into a single structure.

Rigid-flex PCB finds various applications in different technologies. There is an advancement in rigid technology which has increased the applications in communication, consumer electronics, medical appliances, and automobiles. There is an increase in demand for products having a small size and more power. This creates a demand for multiple layers for accommodating width and spacing of fine line and dense nature.

Rigid-flex PCB can be found in a number of electrical testing equipment because it is assembled in a simple way. There are no solder joints along with delicate wiring which creates connection issues at a specific interval. These solder joints and wiring have been eliminated. Flex PCB also finds its applications in automobiles and various tools. Owing to the reliability of flex PCB, control systems that are commonly used these days also use flex boards. Rigid-flex circuit have two fundamental applications.

Static application:

In this type of application flex circuits are required while installing the circuit board and fitting it into its application.

Dynamic application:

Here, the flex circuit area is flexed in a dynamic way for a number of various reasons.

Rigid-flex PCB Technology and the process of production

The technology for the production of a rigid-flex circuit prototype which require fabrication of rigid-flex PCB and assembly of PCB is reliable and well proved. The portion of the flex PCB overcomes the issue of space and weight. In order to have significant benefits, rigid-flex solutions need to be carefully considered while the options which are available at the initial stages of designing the rigid-flex PCB. It is demanding that the fabricator of rigid-flex PCBs is involved in the design process in order to make sure that there is coordination in designing and fabrication portions. As the design process is also crucial in the rigid-flexible circuit manufacturing and designs.

There is more complexity in the manufacturing phase of the rigid-flex and more time is consumed in comparison to rigid-flex board fabrication. In rigid-flex assembly, all the flexible circuit components are handled, etched and soldered in a different way than rigid FR4 boards.

Best solutions are offered by the rigid-flex boards in limited space and difficult conditions. Moreover, there is a possibility of secure connections of different device components, polarity and tight connections are also ensured and plugs and connectors are also reduced.

Rigid-flex boards offer various advantages which can be enlisted as below

Advantages of rigid flexible circuits

Fewer parts and interconnections are required in comparison to that of rigid-flex boards. It has the ability to meet the complex configurations. 3-dimensional design, stability in terms of dynamics and mechanical design, simplified process of its installation and the way it maintains uniform electrical characteristics add to its advantages. Other advantages include the following:

Materials for rigid Flex pcb Design

There are different materials which are used in rigid-flex printed circuit boards. These include the following:

Conductors: - Conductors are usually made up of copper. Depending upon the requirement, the copper used could be of rolled annealed type or electrodeposited type. So, copper is the main material used in the manufacturing of flexible circuits.

Adhesives: - Adhesives are also one of the considerations in making the flexible circuits and their selection is dependent upon the thickness of the conductor used. Chemical resistance is offered by the adhesives and can bear high temperature. Moreover, they have high flexibility and their impedance is controlled. Adhesives which are commonly used include the following:

Insulators: - following insulators are commonly used in flexible circuit:

Finishes: - Commonly used materials in flexible circuits are:

Why choose PCBONLINE Rigid-Flex PCB

1. As a Rigid-Flex PCB supplier , PCBONLINE strict control rigid flex PCB board material. For the PCB material of rigid flex PCB manufacturers, many requirements need to be considered,The PCB material selected by PCBONLINE is suitable for sticking and good heat resistance to ensure that the rigid joint of the rigid-flexed joint is consistent and not deformed after being heated. For flex material, PCBONLINE chooses base material of smaller size and film, and PCBONLINE chooses Kapton, which is good flexibility, High-temperature resistance, High hygroscopicity, Good electrical and mechanical properties, Good tear resistance. Good weather resistance and chemical properties, Good flame retardancy. About the Polyester Imide (PI), PCBONLINE chooses DuPont, which is made in America.

2. The Rigid-Flex PCB is a combination of FPC and PCB, the production of Rigid-Flex PCB should have both FPC production equipment and PCB production equipment, so the requirements for equipment are higher. PCBONLINE's current equipment is at an advanced level.

A. About Drilling equipment, PCBONLINE chooses ESI UV Laser drilling machine and Hitachi CO2 Laser drilling machine.

B. About printing equipment, PCBONLINE chooses laser imaging machine and automatic exposure machine.

C. About automation equipment, PCBONLINE chooses VCP Plating line, Automatic reinforcing laminating machine and Automatic laminating machine.

2. Good equipment has achieved a strong production capacity, PCBONLINE in the rigid flex PCB design rigid flex PCB assembly and rigid-flex PCB fabrication production is a leading level, you can refer to the following capabilities:

Layer count 1-10
Final board thickness 0.05-0.6mm
Aspect Ratio 3:1
Copper thickness 1/3~3oz
Impedance Control Single Ended
Differential
+/- 10%
+/- 10%
Line/Space Inner Layer
External Layer
1.6/1.6mil
1.6/1.6mil
Min Drill Bit size 6mil
Hole size tolerance PTH
NPTH
+/-2mil
+/-1mil
Hole Position Tolerance +/-2mil
Cover layer Line to PAD
Registration
6mil
+/-2mil
Profile Tolerance Punching
Laser Cutting
+/-3mil
+/-2mil
Surface Finish ENIG
OSP
Immersion Tin
Immersion Silver
Hard Gold Plating
Au 1-5u", Ni 80-200u"
 
0.8-1.2um
0.15-0.45um
Au 1-50u", Ni 80-200u"

3. In terms of quality, PCBONLINE uses high-end equipment to produce, thereby reducing human intervention and further providing quality. Perfect quality system, good quality

4. In terms of delivery time, due to the complicated process of Rigid-Flex PCB combination, there are many processes. If there is any problem in one process, the delivery period is a big problem. PCBONLINE implements a special project follow-up in this aspect to ensure that the PCB is delivered in the shortest time.

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