What does this statement about fiducials mean?

Question

Found this slide and I didn't understand the last statement.

All fiducials should have same image one layer down

Are fiducials not top/bottom layer registration targets during assembly ? Are/Can fiducials used during manufacturing to align layers prior to lamenting them ?

score 2 · Accepted Answer · answered May 13 '16 at 05:14

2

Fiducials are registered using vision technology. Having the same image on the next layer into the board makes it clearer to a wider range of cameras.

answered May 13 '16 at 05:14

Ignacio Vazquez-Abrams

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So in other words they want superimposed fiducials on the two outmost layers of each side of the PCB? – Rev May 13 '16 at 06:08
What you want is very clear fiducials. Superimposing them exactly facilitates this. – Ignacio Vazquez-Abrams May 13 '16 at 06:09

What does this statement about fiducials mean?

1 Answers1