Introduction to Rigid-Flex Boards

Basic Definition and Feature Integration
As a key component in electronic circuit connections, rigid-flex boards are circuit boards formed by combining flexible printed circuits (FPC) and rigid printed circuits (PCB) through processes such as lamination in accordance with specific technical requirements. They skillfully integrate the flexibility and bendability of FPC with the rigidity and structural stability of PCB. In electronic devices, they can adapt to complex spatial layouts while meeting the needs for stable signal transmission and structural support.

Structural Methods by Different Layers
Double-Layer Rigid-Flex Boards
The structure is relatively basic, adopting a combination of "1 layer of flexible board + 1 layer of rigid board". The flexibility of the flexible board allows a certain degree of bending to adapt to non-planar spaces inside the device, while the rigid board provides structural support and a stable foundation for circuit connections. The two work together to meet the needs of simple double-sided circuit layouts and spatial adaptation.

Three-Layer Rigid-Flex Boards
There are multiple structural forms:

"1 layer of flexible board + 2 layers of rigid boards": The flexible board can serve as an intermediate connection or functional layer, with rigid boards on both sides enhancing structural and circuit stability.
"2 layers of flexible boards + 1 layer of rigid board": Increasing the number of flexible board layers improves flexible adaptation capabilities, while the rigid board ensures overall structural strength.

"1 layer of rigid board + 1 layer of flexible board + 1 layer of rigid board": The flexible board is in the middle, playing a role in connection and bending transition. Rigid boards on both sides undertake different circuit functions and structural support, adapting to scenarios requiring flexible connections and multi-layer circuits.

Four-Layer Rigid-Flex Boards
Structural combinations are diverse:
"2 layers of flexible boards + 2 layers of rigid boards": With a balanced number of flexible and rigid boards, flexible boards can realize inter-layer flexible connections and spatial adaptation in multi-layer circuits, while rigid boards ensure stable circuits in each layer.

Five-Layer Rigid-Flex Boards
Including various structures:
"3 layers of flexible boards + 2 layers of rigid boards": With a high proportion of flexible boards, it adapts to highly flexible, multi-layer bent spatial environments, with rigid boards distributed at intervals to provide necessary support.