Author Archives: WorkingBear


Apr23
How many dimple need to be used for keypad metal dome?

Last article I mentioned that my company applied the metal dome without dimple as keypad contact solution just like the cell phone but we had trouble and met keypad press insensitive  issue. Now we solved the problem by adding the … Continue reading

Apr22
Why metal dome keypad must design dimple on it?

Recently my company phased in the metal dome as rubber keypad contact solution. This metal dome solution had been implemented to many cell phone keypad solution also. Better key press feeling, longer life and good reliability is the benefit to … Continue reading

Apr22
HotBar FPC Design Notices

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 … Continue reading

Apr21
Design for Flex cable(FPC) Trace Pattern

Many FPCB designer are not familiar with the manufacturer process and limitation.  I always found design does not meet DFx requirement and insist on their design and finally bring lot of quality issue after mass production. Here I ask FPCB … Continue reading

Apr20
Screen-Printing on PET(PolyEthylene Terephthalate) notices

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 … Continue reading