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UV LED in development

Discussion in 'Electronic Basics' started by none none, Feb 11, 2007.

  1. none none

    none none Guest

    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?
     
  2. Mikkel Lund

    Mikkel Lund Guest

    none none skrev:
    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.
     
  3. Ken Moffett

    Ken Moffett Guest

    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
     
  4. Guest

    Try a sheet of acrylic. Thats what they use in tanning beds. It passes
    the short UV well.
     
  5. default

    default Guest

    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.
     
  6. default

    default Guest

    http://www.ledshoppe.com/led5mm.htm 100 UV LEDs for $12, free
    shipping
     

  7. 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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