TECHNET Archives

April 2005

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Suganthi <[log in to unmask]>
Reply To:
Date:
Fri, 1 Apr 2005 18:09:37 +0530
Content-Type:
Text/Plain
Parts/Attachments:
Text/Plain (139 lines)
 Thanks for the information..

 

-------Original Message-------

 

From: TechNet E-Mail Forum; Tuan Le

Date: 03/31/05 22:49:48

To: [log in to unmask]

Subject: Re: [TN] What does AOI (Automated Optical Inspection) equipment do?

 

A more technical explanation about laser based AOI can be found at:

http://www.orbotech.com/tech_lib_pcb_aoi.asp

For reflective light systems:

http://www.circuitree.com/CDA/ArticleInformation/features/BNP__Features_

_Item/0,2133,125413,00.html

 

Tuan

-----Original Message-----

From: Pete menuez [mailto:[log in to unmask]]

Sent: Thursday, March 31, 2005 6:57 AM

To: [log in to unmask]

Subject: Re: [TN] What does AOI (Automated Optical Inspection) equipment

do?

 

There are (I think) three different technologies to AOI -

Reflective Pixel to pixel

Laser design rule

Reflective Pixel to pixel/design rule combination.

 

I've only had experiance with reflective pixel to pixel so my comments

are

directed to this technology...

 

To begin with you create a program that represents the image you are

inspecting.  The program will tell the AOI where to inspect and what

tolerance to apply to each aperature.  With pixel to pixel the image

being

inspected will be digitized and compared to this programed image.

 

On the actual AOI unit  a light is directed at the image to be

inspected.

The light is reflected back into a camera where the image is captured

and

digitized.  Each pixel of this digitized data will be compared to the

programmed data.

 

There are algorithms in the AOI that analyze the raw input to

differentiate

between real defects and false defects.  For example, a water spot on

copper

will not reflect back to the camera as well as clean copper.  The

algorithm

will evaluate the raw data and make a determination - is this a real

defect

or a false defect. If it determines that its real it is reported; if its

false it is ignored.

 

In a nutshell this is how one type of AOI works.  Hope it helps.

 

pete

 

 

 

 

>From: Suganthi <[log in to unmask]>

>Reply-To: Suganthi <[log in to unmask]>

>To: [log in to unmask]

>Subject: [TN] What does AOI (Automated Optical Inspection) equipment

do?

>Date: Thu, 31 Mar 2005 16:29:08 +0530

>

>Hi all,

>

>         How does AOI (Automated Optical Inspection) equipment will

work?

>.I

>would like to know more info on this ..

>

>Thanks and Regards

>

>---------------------------------------------------

>Technet Mail List provided as a service by IPC using LISTSERV 1.8e

>To unsubscribe, send a message to [log in to unmask] with following text

in

>the BODY (NOT the subject field): SIGNOFF Technet

>To temporarily halt or (re-start) delivery of Technet send e-mail to

&gt;[log in to unmask]: SET Technet NOMAIL or (MAIL)

>To receive ONE mailing per day of all the posts: send e-mail to

&gt;[log in to unmask]: SET Technet Digest

>Search the archives of previous posts at:

http://listserv.ipc.org/archives

>Please visit IPC web site

http://www.ipc.org/contentpage.asp?Pageid=4.3.16

>for additional information, or contact Keach Sasamori at [log in to unmask]

or

>847-615-7100 ext.2815

>-----------------------------------------------------

>Sug

 

---------------------------------------------------

Technet Mail List provided as a service by IPC using LISTSERV 1.8e

To unsubscribe, send a message to [log in to unmask] with following text

in

the BODY (NOT the subject field): SIGNOFF Technet

To temporarily halt or (re-start) delivery of Technet send e-mail to

[log in to unmask]: SET Technet NOMAIL or (MAIL)

To receive ONE mailing per day of all the posts: send e-mail to

[log in to unmask]: SET Technet Digest

Search the archives of previous posts at:

http://listserv.ipc.org/archives

Please visit IPC web site

http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional

information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100

ext.2815

-----------------------------------------------------

 

---------------------------------------------------

Technet Mail List provided as a service by IPC using LISTSERV 1.8e

To unsubscribe, send a message to [log in to unmask] with following text in

the BODY (NOT the subject field): SIGNOFF Technet

To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)

To receive ONE mailing per day of all the posts: send e-mail to Listserv@ipc
org: SET Technet Digest

Search the archives of previous posts at: http://listserv.ipc.org/archives

Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815


---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
-----------------------------------------------------

ATOM RSS1 RSS2