Rigid-flex board with different flexible shapes and preparation method thereof

Abstract

The present invention relates to a rigid-flexible board having different fixable shapes and a manufacturing method therefor, the manufacturing method comprising the following steps: fabricating a flexible core board, a rigid core board, and a prepreg; stacking all of the flexible core board and the rigid core board in a set order; and then performing the processes of laminating, drilling, resist removing , copper depositing , plating, outer layer lines providing, screen printing and resistance welding; performing a conventional surface treatment; performing an operation of providing apertures on the surface treated circuit board so as to expose a flexible region; and performing a shaping operation, by means of laser, to the circuit board on which the apertures are provided, thereby obtaining the rigid-flexible board having different fixable shapes. According to said method, a shaping process to the overlapping region of the flexible substrate is performed before the lamination, being able to improve the arbitrariness of designing the layered structure of the rigid-flexible board so as to satisfy the requirement of multi-branch interconnection, and also being able to save the multi-branch current wiring space, so as to satisfy the requirement of the bending performance of branch circuits, and save the space of the printed board.

Description

technical field [0001] The invention relates to the field of printed circuit board manufacturing, in particular to a rigid-flex board with different flexible shapes and a preparation method thereof. Background technique [0002] With the continuous development of electronic products in the direction of multi-functionality, miniaturization, light weight and high performance, the requirements for miniaturization and high density of printed circuit boards are also increasing, and its products are also changing from traditional printed circuit boards to high-density Build-up printed board development. For rigid-flex boards, the rigid main board connects multiple branch rigid boards through the flexible area is also a direction of high-density development, such as figure 1 shown. [0003] The existing technology is to arrange the flexible lines of each branch side by side on a flexible core board when they are parallel; or to arrange them in layers on a multi-layer flexible cor...

AI Technical Summary

Problems solved by technology

[0003] The existing technology is to arrange the flexible lines of each branch side by side on a flexible core board when they are parallel; or to arrange them in layers on a multi-layer flexible core board. Both methods have great limitations:

[0004] (1) In the case of single-layer wiring, the flexible area where each branch converges will occupy a large area, which greatly wastes the wiring space

[0005] (2) In multi-layer wiring, the flexible part of the branch is only wired on one of the core boards, and for the convenience of production, the unwired flexible core board will also be pressed together with the branch to the rigid area, resulting in too thick a flexible area of ​​the branch line , which seriously affects the bending performance

[0006] (3) Single-layer wiring and multi-layer wiring have the same shape in the branch line convergence area, which cannot meet the installation requirements of the limited width of the flexible area

Images