It's a LASER, Optra R+ with 64MB, I do have a couple of Epson 440's and a Lexmark 7000 the 7000's 1200 dpi comes out better than the Epson's 1400 dpi, but I use neither for anything to do with pcb's
JT
----- Original Message -----
From: Adam Seychell
To: Homebrew_PCBs@yahoogroups.com
Sent: Sunday, July 04, 2004 10:27 PM
Subject: Re: [Homebrew_PCBs] Inkjet Question - resolution
Jeremy Taylor wrote:
>
> To note however, I dont use toner transfer. Any images posetd by me, (as in the photo of the traces between an so-70 nanostar package, was done with photoresist imaged in a vacuume uv box. with a transparency printed at 1200 dpi, with selective calculated undercutting during etch that gave me sub 5 mil traces.
>
> JT
Jeremy,
Can you describe your inkjet setup, what printer brand/model ?,
is it OEM ink or refill, and what transparency brand ? All these
factors effect quality of photomasks made from inkjet printer. I
have tested a few transparency and inkjet combinations and found
huge variations in quality. In general, the manufactures
recommendations are the best solutions. There are other
combinations of products that will save you money but require
lots of testing.
As for printers that claim "1200 dpi", I am wary that this is a
useful specification. All the printers I've tested show the ink
droplets to spread or land in random location with error of 1 or
2 mils. For printing color photos it doesn't matter.
Here is a picture from my Epson stylus 660/Epson
transparency/Epson ink, I haven't seen any inkjet prints with
line edge jaggedness much better than in this image. My cheap
Cannon S330 inkjet is only slightly worse, but still very usable.
Notice the vertical edges are jagged, while the horizontal is
smooth because the head direction is in this axis.
http://members.optusnet.com.au/~eseychell/pictures/Epson_inkjet_film.jpg
Here is the same image in the photoresists on the copper.
http://members.optusnet.com.au/~eseychell/pictures/resist_image_on_copper.jpg
Adam
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