Hi,
Thanks for the information.
Poh
=========================================================================
At 02:54 PM 1/12/99 +0900, you wrote:
>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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>For technical support contact Hugo Scaramuzza at [log in to unmask] or
847-509-9700 ext.312
>################################################################
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