Electronics Forum: fiducials and recognition (Page 1 of 15)

Fiducial recognition using laser

Electronics Forum | Thu Apr 01 22:03:27 EST 2004 | Ken

Are you sure it was measuring a fid? Is it possible it was measuring a block-skip mark?

Fiducial recognition using laser

Electronics Forum | Fri Apr 02 16:31:18 EST 2004 | black5629

Why not use tooling pins (locating pins)? Sounds like the same accuracy...

Local fiducials

Electronics Forum | Mon Oct 25 05:52:34 EDT 2010 | sachu_70

In csae you use 2 fiducial recognition, ensure that board fiducials are oriented across a diagonal and spaced far apart. Also, maintain a prefered dia between 1-2 mm for the fiducial on board to have have a better correction factor recorded during fi

Fiducial recognition using laser

Electronics Forum | Thu Apr 01 14:11:38 EST 2004 | cedams

Many years ago I remember the Philips CSM series SMT machines used a small tubular laser system for identifying fiducials on the PCB. Can anyone suggest suppliers for these devices. Thanks.

Fiducial recognition using laser

Electronics Forum | Fri Apr 02 16:45:29 EST 2004 | cedams

Ken, You'd think so but the tooling pins only register to the drilling process for the PCB. The fiducial registers to the copper pattern and for both glueing and placing SMT components the pads are more important than the holes. That's why the machi

black fiducials

Electronics Forum | Thu Oct 20 05:56:56 EDT 2016 | fadzril

Basically, what is the main issue which requires you to use black fiducials? Stencil mark recognition issues? Solder printer machines have ability to adjust the brightness or contrast.

Re: fiducials

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

Fiducial recognition using laser

Electronics Forum | Sat Apr 03 19:58:53 EST 2004 | Ken

I have used tooling holes and fiucial registration since the late '80's. In fact if your maximum "vision" tolerance is +/- 0.05mm, your in the same ball-park as locating pins. It is true that fiducial registration is more accurate. However, I woul

Fiducial recognition using laser

Electronics Forum | Fri Apr 02 09:50:40 EST 2004 | cedams

Yup. It was definitely checking the fiducials as well as the block skip marks and it used to work pretty well. What it did was started at the center of where the fiducial should be and scanned left. When it found a change in contrast it scanned righ

Fiducial recognition using laser

Electronics Forum | Sat Apr 03 16:39:15 EST 2004 | stefwitt

We had a similar system on the Siemens machines, quite some time ago. However, it was not a laser light but a LED and a fiber cable. Actually the center fiber or receiver was surrounded by a bundle of small fibers for the LED light source. You may al

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