FreeLists / si-list / [SI-LIST] Re: Cross-hatched reference planes

[<Christopher.Jakubiec@xxxxxxxxxxxx>]

I think that the comment may have been made in good
humor.................how about we say you were 'degassing' as opposed
to venting.

Chris Jakubiec
=20

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Lee Ritchey
Sent: Friday, April 06, 2007 11:50 AM
To: Jeff Seeger; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Cross-hatched reference planes

I think the venting that was mentioned in an earlier reply was from
someone who thought my responses were venting frustration with a bad
practice in PCBs. yes, it could be called venting, except for teh CAD
departments who have to try to make Gerber files that include this type
of plane structure.

I don't know what the venting being discussed in this latest string of
mail referes to.

For those who saw my response as simple venting, I apologize.   For all
those engineers and designers who have been asked to create cross
hatched planes, maybe this helped.

For the record, the only fab shops I have seen ask for this in the last
five years are located in Southeast Asia.  Wonder why they do that?

Lee Ritchey


> [Original Message]
> From: Jeff Seeger <jseeger@xxxxxxxxxxxxxx>
> To: <si-list@xxxxxxxxxxxxx>
> Date: 4/5/2007 12:35:30 PM
> Subject: [SI-LIST] Re: Cross-hatched reference planes
>
> Andy wrote:
>
>  > what is "venting"?
>
> In built-up multilayers, which start with a traditional core laminate,

> subsequent dielectrics are applied in liquid or semi- liquid state. =20
> Unbroken copper areas inhibit cure.  Relief is in the form of "vent"=20
> pads appearing as stray anti-pads, or as a cross-hatch shape.
>
> Sorry that carpal tunnel limits my replies.  Or maybe that's a good=20
> thing.
>
> Best regards,
>
> --
>
>       Jeff Seeger                         Applied CAD Knowledge Inc
>       Chief Technical Officer                  Tyngsboro, MA  01879
>       jseeger "at" appliedcad "dot" com                978 649 9800
>
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>  =20


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