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Why is PCB important
Printed circuit board (PCB), also known as printed circuit board in Chinese. It is an important electronic component. The support body of electronic components is also the carrier of electrical interconnection of electronic components. Because it does electronic printing, so called "printing" circuit boards.
Circuit Board Introduction
PCB is a printed circuit board, referred to as printed board, is one of the important components of the electronics industry. Almost every kind of electronic device, from electronic watches and calculators to computer communication electronics and military weapons systems. As long as there are electronic components such as integrated circuits. Printed circuit boards are used for electrical interconnection between components.
A printed circuit board consists of an insulating substrate for connecting wires and a pad for assembling welded electronic components. It has the dual function of conductor and insulating substrate.
It can replace the complex wiring, realize the electrical connection between components in the circuit, not only simplifies the assembly of electronic products, welding work, reduce the traditional way of wiring workload, greatly reduce the labor intensity of workers. And reduce the volume of the machine, reduce the cost of products, improve the quality and reliability of electronic equipment.
Printed circuit board products good consistency, can adopt standardized design, is conducive to realize mechanization and automation of the production process.
At the same time, the whole printed circuit board after assembly and debugging can be used as an independent spare part, which is convenient for the replacement and maintenance of the whole machine. At present, the printed circuit board is widely used in the production and manufacture of electronic products.
The earliest use of printed circuit boards was paper - based copper-coated printing boards. Since the advent of the semiconductor transistor in the 1950s, demand for printed boards has risen sharply. Especially with the rapid development and wide application of integrated circuit, the volume of electronic equipment is getting smaller and smaller. The increasing density and difficulty of circuit wiring requires PCB to be updated constantly.
At present, the variety of printed board has developed from single panel to double panel, multi-layer board and flexible board.
Structure and mass are also developing towards ultra-high density, miniaturization and high reliability. New design methods, design consumables and board materials, board technology continue to emerge. In recent years, a variety of computer aided PCB design (CAD) printed circuit board application software in the industry has been promoted and promoted, in the professional printed circuit board manufacturers, mechanization, automation production has completely replaced the manual operation.
Automobile circuit board
The second is the PCB invented by Austrian Paul Eisler. He was the first to use printed circuit boards in radios in 1936. In 1943, the technology was used for military purposes in the United States, where it was officially approved for commercial use in 1948. Printed circuit boards have been widely used since the mid-1950s. Printed circuit boards appear in almost every kind of electronic equipment. If there are electronic components in a device, they are also embedded in PCBS of various sizes. The main function of PCB is to make various electronic components form predetermined circuit connections, play the role of relay transmission, is the key electronic interconnection components of electronic products, known as the "mother of electronic products".
Second, PCB can be more and more widely used, because it has a lot of unique advantages, roughly as follows:
It could be high density
Over the years, the high density of printed boards has been able to evolve with improvements in integrated circuits and installation technology.
Through a series of inspection, testing and aging tests, PCB can guarantee long-term reliable operation (service life is generally 20 years).
All kinds of PCB performance (electrical, physical, chemical, mechanical, etc.) requirements can be achieved through design standardization, so that the design time is short and the efficiency is high.
PCB adopts modern management, can realize standardization, scale (quantity), automatic production, so as to ensure the consistency of product quality.
Established relatively perfect testing means, testing standards, through a variety of testing equipment and instruments to PCB products qualified and service life testing and identification.
Assembling PCB products is not only convenient for standardized assembly of various components. But also can realize automation, large-scale production. In addition, PCB and other parts of the whole assembly, but also to form larger parts, systems, until the whole machine.
As PCB products and components are integrated into standardized designs and volume production, these components are standardized as well. Therefore, once the system fails, it can be replaced quickly, conveniently and flexibly, and the system can be quickly restored.
PCB also has some other advantages, such as system miniaturization, light weight, signal transmission speed and so on.
PCB has the following functions in electronic equipment.
(1) Provide mechanical support for fixed and assembled electronic components such as integrated circuits, realize wiring and electrical connection or electrical insulation between various electronic components such as integrated circuits, and provide the required electrical characteristics.
(2) Provide resistance welding graphics for automatic welding, identification characters and graphics for component installation, inspection and maintenance.
(3) Electronic equipment using printed board. Due to the consistency of similar printed boards, manual wiring errors are avoided. And electronic components can be inserted or installed automatically, automatically welded, automatically detected. Ensure the quality of electronic products, improve labor productivity, reduce costs,
And easy to maintain.
(4) Provide the required electrical characteristics, characteristic impedance and electromagnetic compatibility characteristics for circuits in high-speed or high-frequency circuits.
(5) Printed boards embedded with passive components provide certain electrical functions, simplify electronic installation procedures and improve product reliability.
(6) In large and very large electronic packaging components, for electronic components miniaturized chip packaging to provide an effective chip carrier.