1. Introduction

The assembly of the printing plate is based on the requirements of the design documents and process specifications, and the electronic components are inserted into the printed circuit board according to a certain regularity, and the assembly process is fixed by fasteners or soldering.

2.Specification

3. Application

PCBs can be single-sided (one copper layer), double-sided (two copper layers on both sides of one substrate layer), or multi-layer (outer and inner layers of copper, alternating with layers of substrate). Multi-layer PCBs allow for much higher component density, because circuit traces on the inner layers would otherwise take up surface space between components. The rise in popularity of multilayer PCBs with more than two, and especially with more than four, copper planes was concurrent with the adoption of surface mount technology. However, multilayer PCBs make repair, analysis, and field modification of circuits much more difficult and usually impractical.