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Abstract

An ultraviolet reactive ink is applied to a translucent substrate in the desired circuit image and partially cured to a tacky state with ultraviolet radiation. A resist material is then applied to the substrate in the negative circuit image and metallic particles are deposited on the ink by vacuum deposition. The ink is then further cured to a hardened state with ultraviolet radiation applied from both above and beneath the substrate to counteract the tendency of the metal to reflect radiation applied only from above the substrate. Finally, the resist material is removed from the substrate leaving the fully formed circuit board comprising the substrate, the fully cured ink circuit image bonded thereto, and a metallic conductive layer on the ink.

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First Claim