Selective plating by laser ablation

Coating processes – Electrical product produced – Welding electrode

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430945, 204 29, B05D 306

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048776440

ABSTRACT:
A method for the selective plating of a metal substrate on which a thin polymeric plating resist is first applied, followed by the selective removal of said resist to expose portions of said substrate to plating, and plating. More particularly, the method hereof includes the steps of selecting a laser wavelength which couples well to the metal substrate, choosing a polymer based plating resist having a low optical coefficient of absorption at said wavelength, curing said resist, subjecting selective areas of said resist to a single excimer laser shot, having a short wavelength, to cause ablative removal of the resist over the selective areas of said substrate, and subjecting said exposed portions of said substrate to metal plating.

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R. Srinivasan et al. JVST, B1, 923.
Gold Bulletin 1986, 19, "Laser Surface Alloying of Gold", C. W. Draper, pp. 8-14.
Journal Applied Physics 59, Jun. 1986, "Excimer Laser Etching of Polymers", by V. Srinivasan et al., pp. 3861-3867.
Materials Research Society, vol. 72, 1986, "Laser Photoetching of Polymers" by H. S. Cole et al., pp. 241-245.
A reprint from the Proceedings of SPIE-The International Society of Optical Engineering, vol. 610, pp. 1-5 Scientific and Engineering Applications of Commercial Laser Devices, Jan. 21-24, 1986, "Commercial Excimer Lasers" by Herbert Pummer.
Elsevier Sequoia/Printed in the Netherlands, paper presented at the International Conference on Metallurigical Coatings, San Francisco, Calif., Apr. 6-10, 1981, "The Effect of Laser Surface Melting on Tin-Modified" by C. W. Draper et al.
Apr. 6-10, 1981, "The Effect of Laser Surface Melting on Tin-Modified" by C. W. Draper et al.

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