In my previous post, I mentioned that our company once used metal domes without dimples as the keypad contact solution—similar to what’s used in some cell phones. However, we soon ran into a problem: the keypads were not sensitive enough when pressed.
We eventually solved this issue by switching back to metal domes with dimples, and still achieved a 1,000,000-cycle finger press lifetime.
Recently, our company introduced metal dome technology as a contact solution for rubber keypads, a trend also seen in many cell phone keypad designs. The advantages of using metal domes include a better key press experience, extended lifespan, and improved reliability. According to data, metal dome keypads can endure 2,000,000 finger presses compared to the 300,000 presses of poly-dome keypads. read more…》
The HotBar soldering is a kind of selective soldering solution where connect two pre-fluxed, solder coated parts by pulse heating element, call a “thermode”, with proper temperature to melt the solder and re-solder.
Applying a pressure and contacting on the soldering target is necessary to melt the solder and insure that components stay in place during cooling.
Many FPCB designers may not be well-versed in the manufacturing process and its limitations. Workingbear have often come across designs that don’t meet DFx requirements, where designers insist on their approach, leading to numerous quality issues during mass production.
In an effort to prevent future quality failures and high costs due to yield losses, I propose that FPCB suppliers share some manufacturing insights regarding flex cable (FPCB) design capabilities.
The PTF uses silk-screen to print the silver and carbon combination conductive inks on PET substitute to reach lower cost purpose as compare with FPC (Flexible Printing Circuit). Unfortunately, the screen-printing still has some ability limits. Especially that it has problem for fine trace width and fine space. This article will discuss screen-printing on PET limitation.
