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 >[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 >----------------------------------------------------- >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 ----------------------------------------------------- -----------------------------------------------------