Homebrew PCBs

At 01:08 AM 10/17/2005, you wrote:

>  >Why do you need a laser? A UV LED with a collimating lens should be
>  >sufficient. You don't need coherent light, and the only advantage then to a
>  >laser is the smaller beam divergence initially.
>
>Right, but where to find the Collimator?
>The 250mW UV led is 6 x 6 mm and the necessary collimated beam has to be of
>0.0254mm diam.
>Any solution here?
>Cristian

You're going to have the same problem with a laser, except the beam will 
start out with a 1-2 mm diameter instead of a 15 degree divergence.

Your problem is the same as that of a microscope. So consider using the 
objective lens of a microscope possibly along with an ocular lens. Just as 
with a microscope, you'd have to manipulate the distance in order to focus 
on the object plane.

This is why they call it "optoelectronics".

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Robert A. LaBudde                      Email: ral@...
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