Abstract:
Disclosed are a printed circuit board and a method of manufacturing the same. The method in accordance with an embodiment of the present invention includes: forming an electroless plated layer on an insulation layer; and forming a circuit pattern by applying conductive ink on the electroless plated layer through an inkjet method.
Abstract:
A method for manufacturing metallized aluminum nitride substrate. The method includes: Step A for forming a high-melting point metal layer over a sintered aluminum nitride substrate; Step B for forming over the high-melting point metal layer an intermediate metal layer of at least one selected from the group of: nickel, copper, copper-silver, copper-tin, and gold by plate processing; and Step C for forming a surface metal layer containing silver as a main component over the intermediate metal layer by coating a silver paste whose glass component content is 1 mass % or less and firing under nonoxidizing atmosphere. By this method, it is capable of forming a glass component-free silver layer which is adhered at a high degree of adhesion strength onto the high-melting point metal layer formed over the aluminum nitride substrate as a top face by thick-film method using a silver paste which makes thick-membrane forming easier.
Abstract:
A circuit board high in reliability and a method for manufacturing the circuit board are provided. The electrical resistance is accurately adjustable without damaging the circuit body even if it is made of resinous material and is free from a change over time. A circuit board in which a resistor (16) consisting of a resistor paste is printed between electrodes (14a) formed on a circuit pattern (14) printed on a printed circuit board (11), wherein a conductor (18) for adjusting the electrical resistance value of the resistor is coated on the surface of the resistor.
Abstract:
A structure of solder joint structure formed of zinc-based lead-free solder having excellent characteristics is disclosed. Between a first lead-free solder layer and a soldering pad, the following layers are formed: a tin-copper alloy layer formed on the pad; a first alloy layer formed of second lead-free layer of which main ingredients are tin and silver; and a second alloy layer formed between the first alloy layer and the first lead-free solder. This structure allows forming the solder joint structure formed of zinc-based lead-free solder having high joint strength.
Abstract:
A method of manufacturing a multi-stack package that ensures easy application of a solder paste or a flux. The method includes forming a first package comprising a first substrate on which bumps are arranged and a second package comprising a second substrate on which electrode pads corresponding to the bumps are arranged, applying a solder paste on the bumps of the first package, and electrically connecting the bumps of the first package and the electrode pads of the second package.
Abstract:
A novel board for printed wiring comprising a fine conductor wiring having a clear and favorable boundary line and fabricated by an ordinal printing method such as screen printing, a printed wiring board using the same, and methods for manufacturing them. A board for printed wiring and a method for manufacturing the same are characterized in that the surface of a board is subjected to one of the surface treatments: (a) roughening, (2) plasma treatment, (3) roughening and then plasma treatment, and (4) roughening and then forming of a metal film coating by sputtering. A printed wiring board and a method for manufacturing the same is characterize in that a conductor wiring is fabricated by printing using a conductive paste containing metal particles the average particle diameter of which is 4 μm or less and the maximum particle diameter of which is 15 μm or less. Another printed wiring board and a method for manufacturing the same is characterized in that the surface of a conductor wiring fabricated using a conductive paste containing metal particles M and a binder B at a volume ratio of M/B of 1/1 to 1.9/1 is etched, a plating coating is formed on the surface.
Abstract:
An integrated circuit including an interlayer dielectric which may be prone to failure due to processing conditions may be protected by coupling the integrated circuit to a substrate through a solder ball over a conductive polymer. The conductive polymer allows conduction of electrical current to or from the integrated circuit and also provides cushioning against stresses including both mechanical perturbations and thermal expansion and contraction. As a result, relatively lower dielectric constant materials may be utilized as interlayer dielectrics within the integrated circuit.
Abstract:
First components and second components in which bumps are formed on the lower surface thereof and laminate structures are formed by mounting them to stack with each other on a circuit board 13 are picked up from a component supply unit 1 using a placement head 16, and by lifting and lowering the placement head 16 holding the first components and the second components relative to a paste transfer device 5 supplying a flux 10 in the manner such as coating films having two types of different thicknesses, the flux 10 is supplied to the bumps of the plurality of components in a bundle using a transfer coating method. With such a configuration, it is possible to efficiently perform a component mounting with a satisfactory adhesiveness by ensuring an optimal amount of application quantity of a paste.
Abstract:
A connecting terminal provided on a substrate and a connector provided on an electronic device are connected via a bump formed of a first member, which is formed of an anisotropic conductive paste including particles of a conductive material, and a second member which is different in conductivity from the first member. According to such a structure, since the anisotropic conductive paste which is softer as compared to a solder bump is used, stress applied to an interface between the bump and the connecting terminal is relaxed. Accordingly, reliability of connection can be assured even when using a substrate with large surface irregularities and/or bending, in which stress occurs relatively easily in a connection part of the bump and the connecting terminal.
Abstract:
A method of embedding thick-film capacitors includes etching foil electrodes outside the boundary of the capacitor dielectric to prevent etching solutions from coming in contact with and damaging the capacitor dielectric layers.