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Science Forum Index » Electronics - Basics Forum » UV LED in development
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| none none |
 Posted: Sun Feb 11, 2007 10:04 am |
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I'm building a cheap UV exposure frame using a gutted flat scanner unit and
putting in a UV setup so that UV light will travel through the scanners
glass and then hit the board.. it would all be weighted down by a 2-5lb
metal weight attached to the top of the the top. Question i have is will UV
LED's be as effective as UV bulbs? |
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| Mikkel Lund |
| Posted: Sun Feb 11, 2007 10:32 am |
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none none skrev:
Quote: I'm building a cheap UV exposure frame using a gutted flat scanner unit and
putting in a UV setup so that UV light will travel through the scanners
glass and then hit the board.. it would all be weighted down by a 2-5lb
metal weight attached to the top of the the top. Question i have is will UV
LED's be as effective as UV bulbs?
You will need a lot of LED to get the same effect as a fluorescent tube.
Taking in to consideration that UV LEDs are much more expensive the
fluorescent tube, the choice is easy.
--
Hilsen Mikkel Lund
"Sund fornuft, har aldrig stoppet en tosse"
Jokeren i "Mænds ruin" |
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| Ken Moffett |
| Posted: Sun Feb 11, 2007 2:48 pm |
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"none none" <noen@none.com> wrote in
news:45cf2278$0$24720$4c368faf@roadrunner.com:
Quote: I'm building a cheap UV exposure frame using a gutted flat
scanner unit and putting in a UV setup so that UV light
will travel through the scanners glass and then hit the
board.. it would all be weighted down by a 2-5lb metal
weight attached to the top of the the top. Question i have
is will UV LED's be as effective as UV bulbs?
One thing to think about is the transmission of UV light through
the scanner glass. I'm not sure what type of glass is used, but
there is a sever loss at the shorter wavelengths in all glass.
http://www.edmundoptics.com/techSupport/DisplayArticle.cfm?
articleid=259
There is a chart on transmission vs. wavelength down the page.
Though I have heard, somewhere, that the glass used in some
copier beds has a relative high transmission rate.
Just something to consider.
Ken |
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| Guest |
| Posted: Sun Feb 11, 2007 2:52 pm |
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Try a sheet of acrylic. Thats what they use in tanning beds. It passes
the short UV well. |
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| default |
| Posted: Sun Feb 11, 2007 4:01 pm |
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Guest
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On 11 Feb 2007 10:52:03 -0800, ericwhit@sigecom.net wrote:
Quote: Try a sheet of acrylic. Thats what they use in tanning beds. It passes
the short UV well.
Tanning beds use long wave UV. Most plastics are unsuited to UV
light.
Quartz glass if you have a choice.
I had a cheap exposure frame and the glass didn't appear very special.
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| default |
| Posted: Sun Feb 11, 2007 4:02 pm |
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Guest
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On Sun, 11 Feb 2007 15:32:31 +0100, Mikkel Lund <mmlu03@space.aau.dk>
wrote:
Quote: none none skrev:
I'm building a cheap UV exposure frame using a gutted flat scanner unit and
putting in a UV setup so that UV light will travel through the scanners
glass and then hit the board.. it would all be weighted down by a 2-5lb
metal weight attached to the top of the the top. Question i have is will UV
LED's be as effective as UV bulbs?
You will need a lot of LED to get the same effect as a fluorescent tube.
Taking in to consideration that UV LEDs are much more expensive the
fluorescent tube, the choice is easy.
http://www.ledshoppe.com/led5mm.htm 100 UV LEDs for $12, free
shipping
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| Michael A. Terrell |
| Posted: Sun Feb 11, 2007 10:20 pm |
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none none wrote:
Quote:
I'm building a cheap UV exposure frame using a gutted flat scanner unit and
putting in a UV setup so that UV light will travel through the scanners
glass and then hit the board.. it would all be weighted down by a 2-5lb
metal weight attached to the top of the the top. Question i have is will UV
LED's be as effective as UV bulbs?
Is that flatbed scanner the usual off white plastic? If so, it will
not stand up to high levels of UV light for long.
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida |
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