New Technology for Flex Printed Circuit – Components under Coverlay

With the development of modern industry, there are more and more projects need to use flexible circuit, and the requirements of assembly are getting higher and higher.

In the Flex Printed Circuit (FPC) typical production process, normally we will finish the entire flexible PCB production process, and then arrange to solder components. But such a finished product, components exposed, it can not pass the waterproof test. Our traditional waterproof process is to cover Silicon or conformal coating.

But how can you make the components waterproof more fastness after flex circuit assembly?

Our engineers decided to change the production process after discussion. For new technology,

  • The first step is trace Etching;
  • Second step is surface treatment (normally is ENIG (Electroless Nickel/Immersion Gold);
  • Third step is component assembling;
flex circuit with component stackup

flex circuit with component stackup

 

 

 

 

  • The Forth step and the most important step is making the pure adhesive between base material and coverlay, we need to laser cutting or punching the cutout above the area of component, so that there’s no extra adhesive in that area and then the total thickness of that area will no be too high.
flex circuit with component stackup2

flex circuit with component stackup2

 

 

 

 

 

And you can see the full picture showing step 3 to step 4 of flex circuit components making.

flex circuit with component stackup

flex circuit with component stackup

 

 

 

 

 

 

 

After that, we put the Polyimide on pure adhesive and then go the next step of lamination process. (To laminate the coverlay on the surface of component.).

You can see below pictures.

flex circuit with components

flex circuit with components

 

 

 

 

 

 

flex circuit with components details

flex circuit with components details

 

 

 

 

 

 

 

 

You can visit our website or send us your email if you would like to know more about flex printed circuit.

Definition of FPC

When we talk about the FPC in our industry, most of us know it stands for Flexible Printed Circuit, the update products of PCB. Also for the Flexible Circuits, the most broadly accepted defi nition is the one that is found in the industry standard IPC-T-50 Terms and Defi nitions for Printed Boards. In that document, flexible circuits are defi ned as “A patterned arrangement of printed wiring utilizing fl exible base material with or without fl exible coverlayers.” 

Each person in circuit industry will know its definition (meaning), but do you FPC also stands for other meanings?

 You can search FPC via Google, when you will find the top sites whom appear in the first page of searching results have little relation to Flexible Printed Circuit. For more, click here for FPC searching result.

Is it funny? In fact, it’s a popular phenomenon in our daily life. Things maybeÂare different from what we thought. We have to dig it. The follows are some definition of so called ‘FPC’ in different language(from wiki):

German:

  • Free Pascal ist ein Open Source-Projekt, das sich zum Ziel gesetzt hat, einen freien, 100%ig kompatiblen Turbo Pascal-Klon zu programmieren. Das Projekt ist weit fortgeschritten.Es steht auch die Option der Nutzung unter der LGPL zur Verfügung, so dass auch ein kommerziellerEinsatz möglich ist, siehe hierzu die Lizenzbedingungen.
    de.wikipedia.org/wiki/Fpc

French:

Formation Professionnelle Continue www.knowup.com/pages/ressources/lexique.cfm/ 

English:

Florida Parole Commission is responsible for making decisions on the granting and revoking of parole. FPC also reports to the Board of Executive Clemency the circumstances, the criminal records, and the social, physical, mental, and psychiatric conditions and histories of persons under consideration by the board for pardon, commutation of sentence, or remission of fine, penalty, or forfeiture. … www.fcc.state.fl.us/fcc/reports/final98/98gloss.html

  • Predecessor of FERC
    www.saludahydrorelicense.com/glossary.htm
  • Front Page Challenge (aired 1957 – 1995) was a Canadian current events-cum-history program disguised as a game show, in which notable journalists attempted to guess what past news story the hidden guest was linked with. Upon conclusion of he challenge, the journalists served as a panel of interviewers as they conversed with the guest about the story in question.
    en.wikipedia.org/wiki/FPC

Dutch: 

Portuguese:

Federa o Portuguesa de Campismo. Organismo reconhecido pelo estado Portugus, com a tutela, atravs da sua actual Escola Nacional de Montanhismo, de coordenar a pr¡tica montanhismo e escalada em Portugal.
luis-avelar.planetaclix.pt/dicionario/dicio_f.ht

At the end of this artile, remind the reader again, if you want know the real meaning of FPC in the circuit industry, please visit our homepage where you will find out what a real Flexible Printed Circuit is!