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Re: gEDA-user: photo-imagable supplies
At the time, in 1995 when I was doing this, the job cost was about $20 for two prints.
The density was fine, and I don't know for sure what type of film it was. I do know that I have made transmission holograms with X-ray film, I wonder if that might be cheaper. (Hospitals go through crates of the stuff, we used 'Chest film' for this, as it has excelent fine detail). We processed it by hand with regular developer and fixer. (I think). The latter chemicals are available at 'real' camera stores.
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Mike Jarabek
FPGA/ASIC Designer, DSP Firmware Designer
http://www.sentex.ca/~mjarabek
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-----Original Message-----
From: John Griessen <john@xxxxxxxxxxxxxx>
Date: Tue, 17 Apr 2007 09:33:10
To:gEDA user mailing list <geda-user@xxxxxxxxxxxxxx>
Subject: Re: gEDA-user: photo-imagable supplies
Mike Jarabek wrote:
> Hi,
>
> When I did double sided photoresist boards I used a frame made from aluminum.
[jg]Thanks Mike. Sounds like a good holder method.
occasionally the print shop that did my photomasks would use a different piece of glass to hold down my original,
After I got burned a couple of times, I added a vernier scale to the output plot,
and showed them the error, and made them do it again until they got it right. The eventually figured it out, and after
that they made real nice plots for me.
This touches on the situation I've found now. Ordinary print shops don't do decent film repro work,
and say they can't get the high contrast film, and I found only one expensive supplier so far.
Microchrome Technology Products quoted $350 for 25 sheets film and $300 for cases of chemicals
last October... An easy price for 50 micron line work, but not for us...
anyone know a current supplier?
John Griessen
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