[ Date Time : 2010-8-13 ] [ Comments : 0
Printed circuit board
, also known as printed circuit boards or PWB(printed wiring board), electrical connection of electronic components provider. With development over 100 years of history,it is designed mainly to layout; The main advantage of using circuit board layout and assembly
are greatly reduced errors, improved the level of automation and production labor rate.
The inventor of printed circuit board is Austrian Paul Luoaisile (Paul Eisler), he used printed circuit boards in a radio device in 1936. In 1943, Most of Americans using the technology within the military radio. In 1948, the United States formally recognized the invention for commercial purposes. Since the mid-50s of the 20th century, printed circuit board technology began to be widely adopted. Before the appearance of the printed circuit board, electronic components are to rely on the interconnection between the wire and direct connections to achieve. Now, the circuit bread board is as an effective experimental tool exists, printed circuit board in the electronics industry has occupied the position of absolute rule.
Printed circuit board design
is based on circuit picture shows the basis for the circuit designer to achieve the functionality required. Printed circuit board design layout mainly refers to the need to consider the layout of the external connections, internal electronic components of the optimal layout, interconnect and via optimization of the layout, electromagnetic protection, heat dissipation and other factors. Good layout can save production costs, achieve good circuit performance and heat dissipation. Simple layout can be achieved by hand, require complex layout using computer-aided design (CAD) to achieve.
The main advantages of using PCB:
1. As the graphics with the repeatability (reproducibility) and consistency, reducing wiring and assembly errors, saving equipment maintenance, testing and inspection time;
2. Design can be standardized, which will help exchange PCB
3. Wiring density, small size, light weight, the miniaturization of electronic devices benefit;
4. Conducive to mechanization and automation of production and improve labor productivity and lower cost of electronic equipment. PCB manufacturing methods can be divided into minus method (Subtractive), and add method (Addition) The two major categories. Currently, large-scale industrial production or in less law-based method of corrosion of copper foil.
Printed circuit board, also known as printed circuit boards or PWB(,printed wiring board) often using abbreviations PCB (Printed circuit board), is an important electronic components, electronic components supporting body connections of electronic components provider. Because it is produced using electronic printing technology, so called "printed" circuit boards. Before the appearance of the printed circuit board, electronic components for interconnection between the wire and direct connections are formed depend on the complete line. Now, the circuit bread board only as an effective experimental tool for the existence of the printed circuit board in the electronics industry has become occupied the position of absolute rule. The early 20th century, people in order to simplify the production of electronic machines, reducing the wiring between electronic components and reduce production cost advantages, they began to study ways to replace the printed wiring methods. Three decades, there have been engineers in the insulating substrate made of metal conductors for wiring them. The most successful was 1925, the United States, Charles Ducas insulating substrate in the printing out of line patterns, then plating the way for the successful establishment of conductor wiring.  until 1936, the Austrian insurance Luoaisile (Paul Eisler) published in the United Kingdom foil membrane technology , he used a radio device, printed circuit board; in Japan, Miyamoto Kinosuke to spray attached wiring Law "メ ン law タ リ コ blowing wiring methods (license No. 119384)" successful patent applications.  while the whichever Paul Eisler of the methods and present the most similar to the printed circuit board, such practices as less method is to remove unwanted metal; and Charles Ducas, Miyamoto Kinosuke practice is only with the necessary wiring, known as the additive method. Even so, because the heat of electronic components was large, with the two substrates are difficult to use , so not practical for a formal, but also printed circuit technology further.