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UV solder mask laser exposure (streamable.com)

submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/[email protected]

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This is UV sensitive solder mask resin, applied as thin as possible using a silk screen mesh. Afterwards it's heated at about 90C for 10 minutes. This makes it more sensitive to UV light by evaporating most of the solvent.

It is exposed with a 405nm laser at about 250mw of power. I intentionally unfocused the laser for a spot size of about 0.5nm

After exposure the pads are easily cleaned off with some IPA.

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[–] [email protected] 7 points 1 month ago

Photolithography is so satisfying to watch. Thanks for sharing.