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January 1999

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Subject:
Re: : Pink Ring
From:
Motoyo Wajima <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 12 Jan 1999 14:54:00 +0900
Content-Type:
text/plain
Parts/Attachments:
text/plain (71 lines) 
Hi Poh!
Pink ring is a cosmetic defect in which a pink area is seen on an internal
copper feature surrounding a plated hole.
This appearance is caused by the presence of clean copper,free of the
copper oxide coating used an adhesion promoter between internal copper
feature and prepreg resin.
The copper oxide surface treatment is very soluble in acid. Therefore,if
the prepreg resin-copper interface is damaged during drilling,the copper
oxide will dissolve during the plating process,leaving a distinct pink ring
around holes.
Although this is not a serious reliability defect,it is a cosmetic problem
and often a cause for rejection.
One way to prevent pink ring problems is to use a copper oxide reduction
step after copper oxide formation.
This step converts the copper oxide crystals back to metalic copper,preserving
their topology.
The copper oxide reduction process was developed by Hitachi,Ltd. in 1986.
U.S.P.4,642,161(Date of Patent Feb.10 1987)"Method of bonding copper and resin"
(EP 189,913,KRP 63,008) is the Hitach's Patent.

Regards,
Motoyo Wajima
General Purpose Computer Division,Hitachi,Ltd.(Japan)





Poh Kong Hui  $B$5$s$O=q$-$^$7$? (B:
>Hi Technetters,
>
>What is the term "Pink Ring" meant ?
>
>
>Poh
>
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***********************************************
Motoyo Wajima
General Purpose Computer Division,Hitachi,Ltd.
1 Horiyamashita
Hadano-shi,Kanagawa-ken,259-13 Japan
E-mail:[log in to unmask]
Fax:+81-463-88-2935
***********************************************

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