pcb board patch is a type of package, called SMT,
Patch package refers to the component is welded directly on the solder pad of the PCB board, and the package can only be placed on one layer, unlike the DIP component.
When welding, for the PIN foot is very small (like general resistance capacitance), SMT parts with small foot density can be manually welded, but for the foot density and small spacing (like some chips), these will be used to patch the machine!
The SMT machine is a device used to achieve high-speed and high-precision placement of components, and is the most critical and complex equipment in the entire SMI and production. SMT mounter is the SMT equipment to be used in the production of SMT. Now, the mounter has developed from the early low-speed mechanical mounter to the high-speed optical mounter, and has developed to the multi-functional, flexible connection modular.