PCB Printed Circuit Board Basics Summary

Printed circuit - on the surface of the insulating material, to provide components (including the shielding element) electrical connection between the conductive pattern.
Printed circuit - on the surface of the insulating material, according to a predetermined design, PCB copy board printing molybdenum plating produced a printed circuit, printing elements, or a combination of both a circuit called printed circuits.
Printed circuit / circuit board - has completed processing of printed circuit or printed circuit board insulation collectively.
Low-density PCB - PCB mass production, in 2.54 mm standard coordinate grid intersection between the two plate laid a wire, the wire width is greater than 0.3 mm (12/12mil).
Medium density PCB - PCB mass production, in 2.54 mm standard coordinate grid intersection between the two plate laid two wires, wire width of about 0.2 mm (8/8mil).
High Density PCB - PCB mass production, in 2.54 mm standard coordinate grid intersection between the two plate laid three wire, wire width of 0.1 to 0.15 mm (4-6/4-6mil).
(2) according to the printed circuit substrate and the conductive pattern of the sub-categories?
- According to the substrate used: rigid, flexible, just - flexible;
- Press the conductive pattern: single-sided, double-sided, multi-layer.
3 outlined the role of printed circuits and printed circuit industry characteristics?
- First, transistors, integrated circuits, resistors, capacitors, inductors and other components of the PCB copy board fixing and assembly of the mechanical support.
Second, it implements the Tungsten eletrode  integrated circuits, resistors, capacitors, inductors and other components and electrical connection between the wiring, electrical insulation, to meet their electrical characteristics.
Finally, for the PCB copy board electronic components assembly process inspection, maintenance provides identification characters and graphics, provides for the wave soldering solder graphics.