In the early PCB manufacture, HASL is the most widely used surface treatment, which has excellent welding performance and low cost.With the high precision PCBs developing, it is difficult to below the surface to smooth of HASL, which brings difficulties to SMT mounting. In addition, the service life of HASL
Many PCB designers think the silkscreen legend is not as important as circuit,so they didn’t care about the legend dimension and place position.As a PCB expert, we should consider these particular details.There are some tips for those new PCB designers.
PCB silkscreen automatical machine
The standard design of PCB Silkscreen:
Oil printing: The
PCB Depth control routing technology is the stepstair or groove shaped by partial routing in printed circuit boards(PCBs) manufaturing.It have great advantages in PCB assembly as the special shape of depth routing.
Use the step stair of PCB edge make card slot is favor for PCB fixed and installation.
It
Multilayer PCB have played the leading role as double side PCB is a far cry from meeting demands as upgrading constantly of electronic products in nowaday. Most PCB users don’t know what is the multilayer PCB lamination, let us learn it today.
Multilayer circuit boards lamination is all inner layer bonding
PCB is printed circuit board,it mechanically supports and electrically connects electronic components using conductive tracks,pads and other features etched from copper sheets laminated onto a non-conductive substrate,achieve electronic components automated assembly,welding,inspection,guaranteed the quality of electronic devices,improved productivity and reduced the cost,it’s favorable for repair.
PCB from single layer to multilayer,flex,keep ourselves
PCB industry is technology-intensive,capital-intensive,labor-intensive industry.A middle scale factory have thousands workers, most of automatic machines need worker pile line operation.This years Chinese government impel corporation upgrade the structure of industry and the new labor contract law implement,lead to PCB factory face labor cost raise sharply and shortage,then impact production plan,products
PCB design and manufacture is critical and don’t allowed any mistake.The article will analyses why occurs rough unshaped welding in PCB assembly.
There have many factors lead to rough unshaped welding,like PCB PTH weldability, welding temperature incorrect,solder components incorrect,etc. It’s unfavourable for PCB components running,so we must avoid rough unshaped welding.
PCB PTH
As a PCB manufacture engineer, we saw many PCB designers didn’t considered the produce feasible lead to PCB fabrication cost be raised a lot and they didn’t realized. As most of PCB designers don’t have knowledge of PCB manufacture and don’t know how to optimize design can save money.
Seven tips
Back Board Routing Topology
Back board routing topology included Centralized Switching,Distributed Switching,Hybrid Switching,Holst/Slave Switching.
Centralized Switching
Distributed Switching
Hybrid Switching
Host/Slave Switching
The Structure of Back Board
VITA standard required the dimension of back board,tooling hole position and size,direction,each solt,and case heat dissipation etc.
Back Board Connector
Back Board use MULTIGIG RT connector,the
The high in difference of heavy copper PCB is easy lead to oil float away,fake copper exposure,oil uneven when printed solder mask if controlled unwell.This article analysed and improved this problem through line mask printing area, solder mask opening of silkscreen ,printing lay up time and printing method.
The traditional process:
Pre-treatment--->solder
