Homebrew PCBs

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?





    
     

    
    


 



  






      

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