Homebrew PCBs

Depends on what wavelength of UV you are using.  If near UV (e.g., 405 nm), they will work fine. 

John

  ----- Original Message ----- 
  From: Jeff Heiss 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Friday, February 24, 2012 1:21 PM
  Subject: RE: [Homebrew_PCBs] Re: Novel way to expose photo resist??


    
  A DVD laser is IR and a CD laser is red. Would the optics from the lasers
  work for UV?

  Jeff

  _____ 

  From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
  On Behalf Of Dave Sage
  Sent: Friday, February 24, 2012 1:16 PM
  To: Homebrew_PCBs@yahoogroups.com
  Subject: [Homebrew_PCBs] Re: Novel way to expose photo resist??

  I presume a CD or DVD burner has all the optics required to focus the laser
  diode to a very tiny spot. Maybe it's just a matter of swapping out the
  diode for an ultra-violet version. Also concerning not being able to see it;
  I know the coating inside fluorescent tubes converts a lot of ultra-violet
  to visible light. Maybe a target made form a piece of coated glass could be
  made to "see" the dot at least long enough to focus it if required.

  Sage

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