Re: Focusing a laser diode to make PCBs with negative photoresist
- From: Sam Goldwasser <sam@xxxxxxxxxxxxxxxxxxx>
- Date: 21 Mar 2007 19:13:27 -0400
Hugo Elias <hugo.elias@xxxxxxxxxx> writes:
Hi all,
I wonder if anyone can help me. I am trying to make spherical printed
circuit boards using a laser (405nm laser diode) to pattern them. They
are coated with a negative photoresist, so where the light falls is
where the tracks will be.
The problem I am having is focusing the laser light into a small spot,
with no other light outside the spot. At the moment, I can focus the
laser to a spot about 0.2mm diametre. But enough light also falls
outside the spot to cause problems.
I have tried using a pinhole, but this just causes diffraction, making
the problem worse, rather than better.
Start by telling us what exactly you have between the laser diode and
the PCB.
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- From: Hugo Elias
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