The history of the development of printed circuit boards
The use of printed circuit boards.
In daily life, almost all electronic devices use printed circuit boards, from electronic watches, calculators, game consoles, to computers, smart TVs, and mobile phones. He is also indispensable in industry, medical, military, and aerospace.
The simple summary is that as long as the electronic components of the integrated circuit, printed circuit boards must be used to electrically connect the various circuit boards.
Features of printed circuit boards.
High density: With the development of technology, the density of circuit boards is getting higher and higher. Manufacturability: Standardization and large-scale production can be realized, with consistent product quality.High reliability:
There are a series of testing equipment to ensure long-term reliable work.
Assemblable design: The PCB is assembled with various other components as a whole to form larger parts or systems.Maintainability: As the parts assembled by PCB products and various components are produced in standardized design
and scaled, these parts are also standardized. Therefore, once the system fails, it can be replaced quickly, conveniently, and flexibly to quickly restore the system to work.
The origin of printed circuit boards.
The creator of PCB is Austrian Paul Eisler. In 1936, he first used printed circuit boards in radios. In 1943, Americans mostly used this technology for military radios. In 1948, the United States officially approved this invention for commercial use.
Since the mid-1950s, due to CCL’s copper foil and laminate adhesive strength and solder resistance problems have been solved, the performance is stable and reliable, and industrial production has been realized. Copper foil etching has
become the mainstream of PCB manufacturing technology. Production of single panels. If there are electronic parts in a certain device, they are all mounted on PCBs of different sizes. In the early 1990s, Hong Kong, Taiwan, Japan and other
foreign printed board manufacturers came to my country to set up joint ventures and wholly-owned factories, which made my country’s printed board output and technology advance by leaps and bounds and became the third largest
producer of PCBs. The main function of PCB is to make various electronic components form a predetermined circuit connection, which acts as an intermediary transmission. It is a key electronic interconnection of electronic products and is
called the “mother of electronic products”.
cManufacturing process of printed circuit boards.
The manufacturing process of the printed circuit board will vary depending on the manufacturing layer and the materials used. The main manufacturing processes are cutting, brick hole, copper sinking, lamination, exposure, development,
electro-copper, electro-tin, film removal, etching, optical AOI circuit scanning, printing solder mask, solder mask exposure and development, characters, surface Processing, gong forming, electrical testing, final inspection, random testing,
packaging, etc. There are also many special processes, such as hybrid integrated circuits, laser processing, precious metal processing, etc. The manufacturing cost and time of specially processed printed circuit boards are often much greater than
those of ordinary printed circuit boards.
