I believe Keith is on the right track. I've always considered "fisheye"
defects in coating to have a dimpled appearance. Sort of like if you threw a
rock into water and froze the picture just as the first ripple is made. It
sort of pulls away from the middle and builds up a little bit around the
edge.
KennyB
-----Original Message-----
From: Mike Fenner [mailto:[log in to unmask]]
Sent: Friday, February 20, 2009 8:31 AM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coating Inspection
Bob
This is a little to one side of my present comfort zone, but I think I
recall:
The term fisheye is used to differentiate a surface bubble (with or without
an actual covering film) from blistering or vessication which would be at
coating/PCB interface.
Fisheye would more likely be an application defect, vessication would be an
in-service defect.
Blistering could be either depending on the timing.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Willis
Sent: Friday, February 20, 2009 3:52 PM
To: [log in to unmask]
Subject: [TN] Conformal Coating Inspection
I have been putting together some inspection standards for a new workshop in
Germany. I have found a number of references to "Fish Eyes" but never seen
an example. It's a common term but seems to be elusive in terms of actual
examples.
Would the images at the following link be considered "Fish Eyes" by users or
are we looking for more subtle examples like two bubbles between IC leads??
www.ASKbobwillis.com/gonefishing.pdf
Many thanks
Bob Willis
2 Fourth Ave, Chelmsford, Essex, CM1 4HA England
Tel: (44) 1245 351502
Fax: (44) 1245 496123
Mobile: 07860 775858
www.ASKbobwillis.com
New Bob Willis "Printed Board Inspection & Quality Control Workshop" 24th
March www.ASKbobwillis.com/faworkshops.pdf
"Troubleshooting Your Assembly Yields Workshop" 25th March
www.ASKbobwillis.com/faworkshops.pdf
Book Bob's "Step by Step Failure Analysis Workshop" 22nd April
www.ASKbobwillis.com/faworkshops.pdf
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