Method for producing printed circuit board

Abstract

The invention discloses a method for manufacturing a printed circuit board that comprises procedures as following: a. An inner flexible board carries out the procedures of making inner circuit, drilling via-hole and performing lamination treatment; b. an inner base board etched with a circuit and resin material carry out lamellar lamination build-up to acquire a multi-layer base board; c. The multi-layer base board carries out the procedures of opening the joint window of a flexible board by CNC and treating surface of the multi-layer base board; and then performing lamination of a rigid-flex board; d. The via-hole of a rigid board is drilled and the outer surface of the multi-layer base board is etched with the circuit to obtain a multi-layer printed circuit board. As the invention adopts a copper adhesive via-hole method, the cooper conductive adhesive adopted by the via-hole does not cause 'sliver displacement' that silver paste may result in. What is more, as the copper conductive adhesive is poured into the via-hole for electric connection by adopting a printed via-hole method, production efficiency is greatly improved. As processing sequence that circuit is etched first and then the via-hole is drilled is adopted, product performance is more stable. Therefore, the method is applicable to the scale production and manufacture of the multi-layer printed circuit board.

Description

technical field [0001] The invention relates to the technical field of production methods of printed circuit boards, in particular to a production method of rigid-flexible printed circuit boards. Background technique [0002] Rigid-flex boards are widely used in mobile phones, digital cameras, automobiles, instrumentation, medical machinery, PCs, and other fields. Rigid-flexible boards can be used in at least three places on the mobile phone: the connection between the LCD screen and the host, the connection between the image sensor module and the off-machine, and the folding part of the mobile phone; at the same time, the rigid-flexible board has the advantages of easy installation, effective use of installation space, and high density. , Fine pitch, small size, light weight, and strong reliability, cost saving and so on. [0003] Rigid-flexible board refers to a printed board that contains one or more rigid areas and one or more flexible areas. It is composed of rigid boa...

AI Technical Summary

Problems solved by technology

[0004] Many existing flexible board factories and hard board factories regard rigid-flex boards as an expansion direction, but few manufacturers can successfully mass-produce them, and most of them are in R&D or small-batch production.

There are still some technical problems that have not been well resolved, such as: dimensional stability control of rigid-flexible boards, forming technology of rigid-flexible boards, high-precision copper glue through-hole technology, Z-direction linear expansion coefficient, protection and appearance of rigid-flexible parts And other issues

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