Thursday, December 2, 2010

TQRDCE Performance Expectations and Review

checklist013 This is an example that implemnt TRQDCE form for vendor survey.

TQRDCE Introduction:

The strategy of company for establishing and maintaining long-term working relationships is through creating and monitoring mutual performance expect ions and measurements. Performance metrics, constructive feedback, as well as prompt corrective action by the supplier and by customer are fundamental to achieving continuous process improvement.

Friday, October 22, 2010

Metal dome with dimple as keypad solution

Last article I mentioned that my company applied the metal dome without dimple as keypad contact solution just like the cell phone but we met keypad press insensitive  issue. Now we had solved the problem by adding the dimple back to the metal dome and still reach 1,000,000 times of finger press cycle lifetime.

We did some failure analysis and found the keypad insensitive defect was caused by two major issues. One is the foreign contamination, include dust and fiber, that I mentioned at last article. Another one is the oxidation show on the immersion gold finished on the ENIG board pads.

We found the oxidation particles look like the chemical of “P” exuded from base material of PCB. The “P” is one of the major element for the ENIG fabrication process. So we only can control less “P” but can’t remove it from the board.

Monday, August 30, 2010

Without dimple Metal dome as keypad contact

Recently we phased in the meal metal dome as rubber keypad contact solution. The same solution implement to many cell phone keypad solution also. The good is that metal dome can sustain 2,000,000 times of finger press lifetime verse 300,000 times for polydome.

Friday, June 11, 2010

PTF(Polymer Tick Film) process introduction


Polymer Thick Film (PTF) flexible circuits are manufactured by screen-printing conductive ink onto flexible substrates such as PET (Polyethylene terephthalate). It can be single layer or multi-layers circuit by further screen-printing dielectric materials as insulating layer and applying through-hole technologies.


Sunday, June 6, 2010

Notices for Screen-Printing on PET (PolyEthylene Terephthalate)

The PTF uses silkscreen to print the silver and carbon combination conductive inks on PET substitute to reach low cost purpose as compare with FPC. Unfortunately, the screen-printing has some ability limits. Especially for small trace width and small space.

  • PTF: Polymer Thick Film
  • PET: Polyethylene Terephthalate
  • FPC: Flexibility Printing Circuit

Monday, May 31, 2010

Hot-Bar Flex cable Design Notices

The Hot-Bar reflow is a selective soldering process where connect two pre-fluxed, solder coated parts by heating element, call a thermode, with proper temperature to melt the 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.

Friday, May 28, 2010

Shipping carton drop/impact test

The electronic industry grows quickly. Each vendor takes responsible to his own component only to make it good and low cost. Take a flashlight manufacturer as example. There are bulb, wires, switch, spring, and plastic or metal housing make up the flashlight. The manufacturer buys all the sub-components from each supplier and assembles them together to fabricate the flashlight then sell to end-user.

All the sub-components are delivery by air, ocean, or truck to destination. It is important to prevent the delivery parts without damage during transferring. Most of the packaging uses corrugated paper carton and cardboard to hold inside components and prevent it from damage by falling or throwing down by porter or carrier.

Tuesday, May 25, 2010

Flex cable(FPC) Trace Pattern Layout Design Notices

Many FPCB designer are not familiar with the manufacturer and bring lot of quality issue after mass production. Here I summary some of the design notices for the flex cable (FPCB)  manufacturing  ability to prevent future quality fail.

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