Homebrew PCBs

A UV LED will take you weeks to UV plot a board.

See if you can buy a small powerful mercury vapor HID lamp (i.e. 
the kind of thing that needs lots of cooling or it will explode) 
, and make a light pen. Exposure time should be under 1 second 
if you want the pen velocity to be a reasonable rate.

It does sound nice to cut out the photomask step and directly 
expose the resist, but unfortunatly the UV energies required for 
standard resists make it impracticle to do. Do a search for 
"direct laser imaging", or LDI.


Cristian wrote:
> High Power UV LED with Narrow Directivity, offered by Maplin, UK
> (www.maplin.co.uk) order code N76AJ, price GBP49.99.
> 	DC: 3.5volts/15mA
> 	10ms pulse: 30mA
> 	power disipation:60mW
> 	optical power output:750W @ If=10mA
> 	peak wavelength:375nm
> 	spectrum half width:12nm
> 	metal can ( 5.4 mm diameter x 6.2 mm length) with quartz window
> no more optical details, but one can try to find the manufacturer's site.
> 	manufacturer:NICHIA
> 
> Also 1000W wide directivity.
> 
> Any idea about a UV (quartz) colimating lens?
> Cristian
> 
> 
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