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NNTP-Posting-Date: Wed, 25 Dec 2002 23:03:39 -0600
Subject: Re: What light effects photo resist?
Date: Wed, 25 Dec 2002 23:42:57 -0500
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I could make the laser fairly easily for less than a hundred dollars or 200
for a little more wiggle room but there really is a lot of resources on
making lasers out there. how else would I make a line about 1/10th of a mm
wide? semiconductor manufacturing methods use lasers and reduction lenses
to do this.
wrote in message
> Dave wrote:
> > I want to use a laser to develop a board. I want to do this so that I
> > make small yet accurate lines on pcb. I'm not sure what wave lengths
> > resist is sensitive to though. I've read that it is sensitive to uv and
> > another website said that certain uv doesn't penetrate all the way
> > thick photoresist. It also said that a wavelength of 365nm is just
> > something.
> > I was planning on using wavelengths between 320mn and 400 which is
> > if I use other types of uv I may have to be more careful about exposure.
> > the reason I need to know this is because each laser has a specific
> > output wavelength or wavelengths.
> > so what wavelength should I use?
> For the cost of most lasers in the 320-400nm wavelength range, you could
> buy a commercially built PCB maker, or get several dozen boards of
> size made.
> Look at the specs on the photoresist you intend to buy.
> http://inquisitor.i.am/ | mailto:firstname.lastname@example.org | Ian
> 'Where subtlety fails, we must simply make do with cream pies' -- David
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