Abstract:
A method for manufacturing a printed wiring board having a high-density wiring and a highly-reliable connection between conductor layers even if the annealing process is omitted because a conductor circuit made of an electroplating layer excellent in crystallinity and uniform electrodepositability and formed on a base sheet and a via hole are provided. The method comprising forming an interlayer resin insulating layer on a conductor wiring forming board, making an opening for making a via hole in the interlayer resin insulating layer, forming an electroless plating layer (1008) on the interlayer resin insulating layer, applying a resist film (1003) to the layer (1008), forming an electroplating film thereon, removing the resist film, and removing the electroless plating layer by etching so as to form a conductor wiring and a via hole characterized in that the electroless plating layer (1008) serves as a cathode, the plating metal serves as an anode, and electroplating is performed intermittently while maintaining the voltage between the anode and cathode at a constant value.
Abstract:
A process and product manufactured by the process is revealed whereby resistors (16) can be manufactured integral a printed circuit board (10, 13) by plating the resistors onto an insulative substrate (10). Uniformization of the insulative substrate by etching and oxidation of the plated resistor are revealed as techniques for improving the uniformity and consistency of the plated resistors.
Abstract:
A plating method for applying a secondary plating (electroless plating) onto a primary plated film (or a metal film) formed on a substrate for reliably executing the plating reaction at a higher deposition rate without requiring Pd-substitution treatment. The surface potential of the primary plated film is adjusted to be baser than the basest surface potential at which the surface current density of the primary plated film becomes 0 in the electroless plating solution for the secondary plating and, then, the secondary plating is effected. The invention further covers a pH-adjusting agent that is suited for carrying out the electroless plating method, a pretreatment solution for electroless plating that contains a reducing agent and a complexing agent, and an electroless plating bath.
Abstract:
The present invention is directed to an improved method for metallizing polymer substrates, such as polyimides. The present invention comprises the steps of surface treating the polymer substrate with a plasma jet or corona discharge surface treatment, conditioning and etching the polymer substrate with an etching solution comprising a hydroxide and ionic palladium, activating the polymer substrate with ionic palladium, reducing the palladium on the polymer substrate, plating an electroless nickel layer onto the prepared polymer substrate, arid plating an electroless copper layer over the electroless nickel layer. The process of the invention provides an improved method for preparing the polymer substrate for subsequent electrolytic plating thereon.
Abstract:
A process is revealed whereby resistors can be manufactured integral with a printed circuit board by plating the resistors onto the insulative substrate. Uniformization of the insulative substrate through etching and oxidation of the plated resistor are discussed as techniques for improving the uniformity and consistency of the plated resistors. Trimming and baking are also disclosed as methods for adjusting and stabilizing the resistance of the plated resistors.