Hello, Volkan.
Looks like you have your fingers in several pots (homebrew pcbs, direct print resist, homemade photo resist). I love it.
Are you willing to tell us more about your formula and processing for the homemade dichromated PVA resist? A friend (30 years ago) did some silkscreen work using (IIRC) Elmer's glue, which is a PVA product. What else is involved? Or a pointer to where you have already told everyone and I wasn't watching. :)
Thanks much,
Donald.
----- Original Message -----
From: "Volkan Sahin" <v_sahin@...>
To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, November 12, 2009 5:46:45 PM GMT -05:00 US/Canada Eastern
Subject: Re: [Homebrew_PCBs] Making PCB using these new 405nm LASER Diodes
I've a working prototype. I'm using 150mw 405nm blue ray laser diode. Without complicated optics I can get ~3 mil trace width/space. Currently, I'm using Dichromated PVA based homemade photoresist. The problem is without polygon mirror scanner, it is very slow but result is impressive. The exposure time required for 1.5 mil spot is ~20 microseconds.
Volkan
--- On Thu, 11/12/09, lmri2071 <lmri2071@...> wrote:
From: lmri2071 <lmri2071@...>
Subject: [Homebrew_PCBs] Making PCB using these new 405nm LASER Diodes
To: Homebrew_PCBs@yahoogroups.com
Date: Thursday, November 12, 2009, 8:38 AM
I had this idea about seven years ago. But at that time the Laser Diodes
of 405nm were impossible to obtain (USD$4000). Since last year, I have
taken this idea again, because now one can buy those laser diodes around
USD$40 (85mW) in eBay. I saw in web (youtube) some germans guys
experimenting with this, but I have not see the results. Also I read
about a french engineer who made some experiments with UV LEDs coupled
with a fibre optic. I have a Polish paper which expose the use of this
idea to get 50um (2 mils) clear cut beatiful traces, but they use very
expensive optics ( telecentric lenses, glavos and others things which
are too costly for the DIYer ).
Now I struggling with optics. When I get some control of the LASER beam
waist, I gonna put my laser module in a CNC engraver.
There are anyone working on that in this group?
[Non-text portions of this message have been removed]
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