Shouldn't have started drinking so early though. Does Bill know? :-) At 01:03 PM 5/2/2008, Paul Reid wrote: >All this because Bev has RIM voids. > >Why is a mouse when it spins on it's tail? >Would you rather walk to work or carry a lunch? >What would you rather do or drag a board (PCB)? >When is a tree? >All generalities are false (including this one)! > >I will by galumphing off for the weekend soon. > >PR > >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of Dwight Mattix >Sent: Friday, May 02, 2008 2:53 PM >To: [log in to unmask] >Subject: Re: [TN] Voids in internal PCB microvias > >When you can snatch the pebble from my hand I will give you a serious >response (on a friday). > >At 11:22 AM 5/2/2008, Paul Reid wrote: > >Hi Bev, > > > >Backfire ... by all means. > > > >Your subject line says "Voids in internal PCB microvias" > > > >Your customer wants to know the composition of a void in a buried > >microvia. > > > >I think what you have posted is a PCB koan. A classic koan by Hakuin is > > >"You know the sound of two hands clapping. What is the sound of one > >hand clapping" > > > >PCB koan - "You know the composition of what fills a filled microvia. > >What is the composition of what fills a voided microvia?" > > > >The important part of the microvia is the part where there is no > >microvia because that's the part that contains the void. > > > >This is the yin and yang of the what is, and what is not, in a >microvia. > > > > > >Grasshopper, this is the Tao of PCBs. > > > >Paul Reid, PCB Inc. > > > >PS. I would just look at the RIM of the void. > > > > > >-----Original Message----- > >From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian > >Sent: Friday, May 02, 2008 12:54 PM > >To: [log in to unmask] > >Subject: [TN] Voids in internal PCB microvias > > > >TechNetters, > >I have a customer who wants to know the composition of any materials > >(if > >any) inside copper plated internal microvias. Obviously traditional > >x-sectioning would lead to contamination by the x-sectioning process. > >Someone suggested laser cutting, but that is ridiculous, for the same > >reason. Someone else suggested FIB, but this is fiendishly expensive, > >especially for the kind of depth of cut we might be talking about here. > > > >Any and all non-Friday afternoon suggestions welcome. > >(This last statement will probably backfire on me!) Bev RIM > > > >--------------------------------------------------------------------- > >This transmission (including any attachments) may contain confidential > >information, privileged material (including material protected by the > >solicitor-client or other applicable privileges), or constitute > >non-public information. Any use of this information by anyone other > >than the intended recipient is prohibited. If you have received this > >transmission in error, please immediately reply to the sender and > >delete this information from your system. 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