摘要:
A method is disclosed for the visual inspection of electrical circuitry deposited in the layers of a multilayer printed circuit board wherein the dielectric layers of the multilayer board are prepared using a clear, light transparent thermosetting resin having incorporated therein a dye which is permeable to visible light but which absorbs ultraviolet light in the 320-440 nm region. The electrical circuitry in the board can be easily traced by an observer upon illumination of the board by visible light.
摘要:
A substrate is activated by providing a first resist thereon; followed by a second resist on the first resist. The first and second resists differ in their solubility characteristics. The resists are exposed to imaging radiation and developed. The substrate is seeded and the second resist layer is removed, thereby removing seeder, except from exposed areas of the substrate.
摘要:
A method is disclosed for the visual inspection of electrical circuitry deposited in the layers of a multilayer printed circuit board wherein the dielectric layers of the multilayer board are prepared using a clear, light transparent thermosetting resin having incorporated therein a dye which is permeable to visible light but which absorbs ultraviolet light in the 320-440 nm region. The electrical circuitry in the board can be easily traced by an observer upon illumination of the board by visible light.
摘要:
A dielectric surface is conditioned for electroless plating of a conductive metal thereon by exposing the substrate to a gaseous plasma obtained from ammonia and/or an organic amine. The conditioning can be in the holes and/or on the surfaces of the substrate.
摘要:
A substrate is activated by providing a first resist thereon; followed by a second resist on the first resist. The first and second resists differ in their solubility characteristics. The resists are exposed to imaging radiation and developed. The substrate is seeded and the second resist layer is removed, thereby removing seeder, except from exposed areas of the substrate.