1) FPC process: Flex Board Cutting→Drill Locating Hole→Image→AOI→Cover Film→Lamination
2) Rigid PCB: Rigid Board Cutting→Drill Locating Hole→Rigid Board Pre-treatment
3)Main process: Rigid-Flex Fusion→Drilling→PTH→Outer Layer→Outer Layer AOI→Solder Mask→Finishing→Screen→Gong Open Lid→Routing→E-Tes→FQC→Packaging
Rigid-flex PCB structure: flying tail structure.
The feature of this structure is that the flexible board has golden fingers or parts design. The flexible board is designed with drilling and electroplating copper to realize interlayer conduction. The golden finger is a plug-in finger, with PI reinforcement to facilitate plug-in and conduction.
1) Three times of plating.
a. Flex board black hole + VCP, flex board electroplating adopts black hole + VCP electroplating process, which has better appearance flatness and copper thickness uniformity.
b. The outer layer of copper sinking + board plating + pattern plating.
It has good reliability for high aspect ratio products and thick copper products.
c. Capping process of the outer resin plug hole. The hole in the pad is covered with a copper layer, which has better solderability and realizes the high-end integrated design of the product.
2)The rigid-flex PCB lid opening process, laser anti-control + positive control, the lid opening process is to open the lid first and then sink the gold.
After the lid is opened, the flexible board surface needs to be exposed to gold and copper, and the rigid board area needs to be gold-immersed together with the pads that need to be gold-immersed. Laser depth control technology, high-precision depth control precision, to achieve a good process of opening the lid.
PI reinforced local fit. Asymmetric pressing, using the PI cover sheet to open first, after the PI is pressed, open the other cover sheet to improve the pressure break. The optimized design of the process solves the problem of the pressure break.
This rigid-flex board is used on the Bluetooth headset, and the main components are located on the rigid board. The flexible board is mainly an antenna, which is responsible for transmitting signals.