 
| Mime-Version: |
1.0 |
| Content-Type: |
text/plain; charset=us-ascii |
| Old-Return-Path: |
|
| Date: |
Sat, 07 Jun 1997 10:56:27 +0530 |
| Precedence: |
list |
| Reply-To: |
|
| Resent-Sender: |
|
| Content-Transfer-Encoding: |
7bit |
| Status: |
O |
| X-Mailing-List: |
|
| X-Status: |
|
| X-Loop: |
|
| TO: |
|
| Resent-From: |
|
| Return-Path: |
<TechNet-request> |
| Cc: |
|
| References: |
|
| Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0waEDJ-000BjGC; Sat, 7 Jun 97 00:38 CDT |
| >From willli Sat Jun 7 00: |
39:14 1997 |
| Resent-Message-ID: |
<"0Y0lQ1.0.JI9.nFFcp"@ipc> |
| Subject: |
|
| From: |
|
| X-Mailer: |
Mozilla 3.01Gold (Win95; I) |
| From [log in to unmask] Tue Jun 17 09: |
12:02 1997 |
| Organization: |
CADET Automation Systems, India. |
| Message-Id: |
|
| Parts/Attachments: |
|
|
Hello
Take a case of a six layer board. Normally a via drilled passes through
all the layers. But in Blind and Buried Via case the following will hold
good.
Blind Via
---------
A Via drilled to route a track from layer 6 to say layer 5. There won't
be any drills at this location in the rest of the layers. The real
estate on these layers is available for tracks/vias.
Thus a via drilled from "top or bottom" layer to any inner layer, that
does not appear on the other side is called a blind via.
Buried Via
----------
A via drilled to route a track say from layer 2 to 5. There wont't be
any drills appearing on either layer 1 or 6. The same could be true for
say vias between layers 3 to 4 and so on.
Thus the via is completely buried between the top and bottom layers, but
is not visible on either of these two layers.
I really do not know what you mean by "Is there such thing as a via to
the outside that has been filled?". Could someone out there shed some
light on this?.
k.v.raj
---------------------------------------------------
>From : K.Varadaraj@CADET Automation Systems, India.
Phone: 91 80 665 7215
Fax : 91 80 528 0101
email: [log in to unmask]
---------------------------------------------------
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To subscribe/unsubscribe send a message <to: [log in to unmask]> *
* with <subject: subscribe/unsubscribe> and no text in the body. *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] *
***************************************************************************
|
|
|
