Flex/Rigid PCB Built on Polyimide and FR-4 With Immersion Gold or Immersion Silver or Immersion Tin for Video Cameras

(PCB's are custom-made products, the picture and parameters shown are just for reference)

Hello everyone.

Today, we're talking about rigid-flex PCB.

A rigid-flex PCB is a combination of rigid boards and flexible circuits, the latter creating flexible inter-connects between the rigid boards to which they are laminated by means of bond plies. Such as the following diagram is rigid-flex drawing.

Both ends are rigid board, flexible circuit is in the middle.

The flexible circuit is manufactured separately and bonded to the rigid boards, either symmetrically, i.e., in the middle of the rigid boards, or asymmetrically, i.e., to the outer side of the rigid boards to be interconnected.

Plated-through holes are provided in the rigid sections of the rigid-flex PCB to establish electrical connection between the flexible circuit and the electronic circuits of the rigid boards. The processes are similar to those used when manufacturing rigid multilayer boards.

Next coming up, let’s take a look at two PCB samples.

The first one is a 4-layer flex-rigid board. The flexible circuit is in the middle, and the two sides are rigid plate and symmetrical structure. The solder mask is green and the surface is treated with gold.

The second sample is a 6-layer flex-rigid board. The first layer and the second layer are the flexible board, located at the top of the flex-rigid board. The flexible board and the rigid board are connected by 1080 prepeg, and the third layer to the sixth layer is the rigid board. What we used is FR-4 from ITEQ Company: IT-180A. The inner layer is 0.5OZ, the outer layer is 1OZ, the whole finished plate thickness is 1.5mm, and the surface finish is immersion gold.

The main raw materials are polyimide and FR-4, copper thickness ranges 0.5oz to 2oz, PCB thickness is up to 2.0mm and maximum size within 400X 500mm.

Flex-rigid PCB contains both flexible area and rigid area, which is of great help to save the internal space of the product, to reduce the volume of the finished product and improve the performance of the product.

Appendix: Our FPC Capability 2021

Company Profile

Founded in 2003, Shenzhen Bicheng Electronics Technology Co., Ltd is an established high frequency PCB supplier and exporter in Shenzhen China, severing cellular base station antenna, satellite, high frequency passive components, microstrip line and band line circuit, millimeter wave equipment, radar systems, digital radio frequency antenna and other fields worldwide for 18 years. Our high frequency PCBs are mainly built on 3 high frequency material brands: Rogers Corporation, Taconic and Wangling. Dielectric constant ranges from 2.2 to 10.2 etc.

Bicheng PCB is headquartered in Shenzhen, a city with great economic vitality. Based in China, we adhere to the philosophy of servicing small and medium sized companies offering variety of circuit boards to meet the demands of market.

Main Business & PCB Applications

We maintain the highest standards which support products that exhibit exceptional quality, performance and reliability. We also have divisions of FR-4 circuit board, flexible circuits and metal core PCBs featured as prototypes, small runs to mass production. We actively research and build such high value added PCB projects as HDI, quick turn, impedance control, heavy copper and backplane board etc. This has made our PCB products generate an effective prolongation and complementation, as well as formation of integrated products line ranging from low-end to high-end.The circuit boards are used in the industries of home appliances, portable and consumable electronics, medical filed, aerospace as well as telecommunications etc.

Main Material Partners