Electronics Forum | Tue Jan 24 10:48:52 EST 2006 | geb
Hi, We are starting to have supplied to us by customers different colour PCBs, which affects the ability of our MPM AP-27 stencil printer to see the fiducials. Has anyone tried and found out what the best and worst colours/ materials are for the fid
Electronics Forum | Tue Jan 24 11:26:09 EST 2006 | russ
We utilize a "keepout zone" around the fiducial that is free of resist, silkscreen, vias, and any other feature. e.g. fiducial diameter of 1mm- we use a 3mm diameter keepout zone. This works very well for us. If the surface finish changes the li
Electronics Forum | Tue Jan 24 11:59:55 EST 2006 | Chunks
Tell your board house/customers you want "non-smobc". hich stands for non-solder maske over bare copper. MPMs love exposed fids in just about any finish. You can always use pads on an MPM too.
Electronics Forum | Tue Jan 24 12:16:51 EST 2006 | PWH
Although I can't say I've had much trouble at all with MpM's reading fids, I will say that most of the P&P equipment I have run can be picky on fids. The fid surface needs to be pretty flat in order to be trouble free on some P&P equipment. I don't
Electronics Forum | Tue May 08 08:41:29 EDT 2001 | caldon
Hmmmmm........I am thinking!!!!! Cleaning is the final process in our situation. After cleaning we have no need for the fiducials. Is the haze causing fiducial recognition problems? Ideally what you are looking for is a contrast between fiducial and
Electronics Forum | Thu Feb 18 17:29:54 EST 1999 | Stefan Witte
The circle is not a "good" fiducial. The gradually change in contrast of a circle versus a cross makes it difficult to find the center of the fiducial. By pre-tinning the fiducials there will be a convex mirror surface distorting the edges even more.
Electronics Forum | Wed Jun 09 13:11:29 EDT 1999 | John Thorup
| In past PCB designs I have cleared all traces from all layers | (except pwr/gnd) from fiducial area. It has come to my attention that this is only necessary on the side where fud is placed. Which is the correct method of design using a fidicial?
Electronics Forum | Tue Aug 02 10:46:03 EDT 2016 | proceng1
We are getting more and more customers wanting LED boards built on White Solder Mask. Well our printers do not get as much contrast between the white mask and the plated fiducial pad, and often the camera only sees white. Other than playing with
Electronics Forum | Wed Jun 13 06:10:08 EDT 2012 | bobpan
When fiducials on pcba's have poor plating and the vision cant find them repeatably there are a couple of things you can try. 1. Use the WAVI light and turn off (setting of 1) the main bright LED ring on the downward camera. After doing this in teach
Electronics Forum | Thu Dec 09 14:10:42 EST 1999 | se
Fiducial recognition is based on finding the centroid of the gray scale density of the fiducial. Round fiducials are easier for the software to digest in most cases, but its more important what the camera sees. Gray scale or color contrast of the fi
