From: David Bergman
Sent: Tuesday, November 09, 2010 4:21 PM
To: [log in to unmask]; '孙该贤'
Cc: John Perry
Subject: RE: [TGAsia] Critical contact area 和 pristine area 的定 义是否是一样的?

Hi Sunny,

The intent of Critical Contact area and Pristine area is the same; that is an area for connection that is free of defects.

For an edge card contact critical contact area and pristine area mean the same; but pristine area is used for features other than edge card contacts. IPC standards 600/6012 use pristine area for other features such as SMT and BGA lands.

I hope this helps.

Best regards,
Dave

David W. Bergman   大山人
Vice President, International Relations
IPC - Association Connecting Electronics Industries
3000 Lakeside Drive Suite 309S Bannockburn, IL 60015-1249 USA
+1 847-597-2840 tel
+1 847-615-5640 fax
+1 847-867-1388 mobile
[log in to unmask]
Skype: davidbergmanipc
www.ipc.org

From: TGAsia [mailto:[log in to unmask]] On Behalf Of ???
Sent: Tuesday, November 09, 2010 12:13 AM
To: Listserv TGAsia
Subject: [TGAsia] Critical contact area 和 pristine area 的定 义是否是一样的?

All:
请教大家一个问题:
Critical contact area  和  pristine area 的定义是否是一样的? 在IPC 标准当中能够找到pristine area 的定义 但是没有发现Critical contact area 的定义,两个英文的术语的定义是一样的还是有差异的?因为在IPC 的很多标准当中两个术语经常交替出现很令人费解!请大家赐教!

Sunny


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