Dear Technetters

I have a question about UV exposure lamps. We currently use mercury
capillary lamps to expose our dry film photoresist and our photoimageable
soldermask. The exposure specification for both these materials is for a
light wavelength between 360 and 380 nanometres.

I have been shown the spectral distribution for our lamps - only 20% of the
radiated energy is in the 320 - 400nm radiation band, over 50% is in the
higher visible and infared bands (which do not assist exposure).

Are mercury capillary lamps the norm for exposure work or are there more
appropriate lamps for this sort of application.

Any information would be appreciated.

 Best Regards

Thornton White

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