source:Industry News release time:2022-07-26 Article author:yu Popular:pcb
In the electronics industry there is a very critical component called PCB. Is it familiar? Especially in Shenzhen, a city that gathers giant electronics companies such as Huaqiangbei, Dajiang, and Goose Factory, even if you are not in the electronics industry, I believe everyone can often hear about PCB in their lives.
PCB (Printed circuit boards), also known as printed circuit boards, is a provider of electrical connections for electronic components. Usually people use "PCB" to express, so it is also called "PCB board".
1. The birth of PCB board
The development of PCB boards has a history of nearly a hundred years. Before the advent of the PCB board, the circuit was composed of point-to-point wiring, but the reliability of this method is very low, and as the circuit ages, the rupture of the line will lead to the open circuit or short circuit of the line node.
Later, wire winding technology was adopted, which is a major advance in circuit technology. This method improves the durability and replaceability of the circuit by winding small diameter wire around the post at the connection point.
As the electronics industry evolved from vacuum tubes and relays to silicon semiconductors and integrated circuits, the size and price of electronic components declined. Electronic products are appearing more and more frequently in the consumer field, prompting manufacturers to look for smaller and more cost-effective solutions. Thus, the PCB was born.
2. PCB structure and substrate type
If you take the cross section of the PCB board to a large enough multiple, you will find that it is like a wafer sandwich biscuit, in which layers of different materials are pressed together by heat and adhesive. Today, let's talk about the base material of the middle layer first.
The different differences of commonly used reinforcement materials can be divided into:
Paper substrate (FR-1, FR-2, FR-3)
Epoxy glass fiber cloth substrate (FR-4, FR-5)
Composite substrate (CEM-1, CEM-3)
HDI sheet (RCC)
Special substrates (metal substrates, ceramic substrates, thermoplastic substrates, etc.)
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