Abstract:
The invention discloses a process for planarization of recessed structures filled with tin or a tin alloy which avoids the formation of dimples. Such structures can serve as solder deposits for stable and reliable solder joints in electronic devices.
Abstract:
A method of manufacturing a printed circuit board includes: forming a copper layer of an interconnection pattern on a base film; laminating a cover lay on the base film so as to expose a part of the copper layer from the cover lay and cover the copper layer by the cover lay; mechanically polishing at least the exposed portion of the copper layer; and performing a plating process on the exposed portion of the copper layer so as to form a plated layer on the copper layer, and the angles α1 and α2 between the polishing direction of the exposed portion of the copper layer and the bending lines C1 and C2 satisfy the following formula (1): 30[°]≦α1 and α2≦150[°] (1).
Abstract:
Nonflammable compositions comprising fluorinated compounds selected from the group consisting of hydrofluoroalkanes, hydrofluoroalkenes, partially or perfluorinated aromatic compounds, hydrofluoroethers, and fluoroketones; 1,2-dichloroethylene, especially trans-1,2-dichloroethylene; and a stabilizer. These non-flammable compositions which preferably contain 1,1,1,3,3-pentafluorobutane, can be used especially as solvents for cleaning and defluxing electronic components and for degreasing metals. The compositions further may comprise a propellant, e.g. 1,1,1,2-tetrafluoroethane. These compositions are especially suitable as flushing agent.
Abstract:
A printed circuit board includes a through hole constituted by a hole penetrating through the front and rear surfaces of the printed circuit board. A fabrication method of the printed circuit board, includes applying conductive material plating to the inner wall surface of the hole to form a through hole electrically connecting the front and rear surfaces of the printed circuit board, and removing the conductive material plated on the hole inner wall surface at least at a portion between the front and rear surfaces of the printed circuit board is carried out to thereby fabricate a printed circuit board having a through hole electrically isolates the front surface of the printed circuit board from the rear surface thereof.
Abstract:
The object of the present invention is to provide a novel cleaner composition that not only reduces ignition by flame and has a small influence on the environment, but that also has an excellent property of dissolving flux residues adhered on narrow portions or in narrow gaps in an object to be cleaned that was subjected to soldering with a lead-free solder, and reduces recontamination of the object in the water-rinsing process. The present invention uses a halogen-free organic solvent (A) represented by a specific Formula; an amine-based compound (B) represented by a specific Formula; a chelating agent having no amino group (C); and, as required, water.
Abstract:
Described herein are a method and an apparatus for removing metal oxides from a substrate surface within a target area. In one particular embodiment, the method and apparatus has an energizing electrode which has an array of protruding conductive tips that are electrically connected by a conductive wire and separated into a first electrically connected group and a second electrically connected group wherein at least a portion of the conductive tips are activated by a DC voltage source that is negatively biased to generate electrons within the target area that attach to at least a portion of a reducing gas that is present in the target area to form a negatively charged reducing gas that contacts the treating surface to reduce the metal oxides on the treating surface of the substrate.
Abstract:
An object of this invention is to provide a cleaner composition that has a desirable cleaning property and is easily separable from pre-rinsing water even when cleaning an object produced by using a lead-free soldering flux; and a lead-free soldering flux removal system using a pre-rinsing method that can reduce the amount of waste fluid.The invention uses a cleaner composition for lead-free soldering flux, comprising (A) specific glycol ethers; (B) a specific polyoxyalkylene amine; and (C) a chelating agent that is at least one member selected from the group consisting of (c1) aliphatic hydroxycarboxylic acid chelating agents and (c2) (poly)phosphoric acid chelating agents.
Abstract:
An object of this invention is to provide a cleaner composition that has a desirable cleaning property and is easily separable from pre-rinsing water even when cleaning an object produced by using a lead-free soldering flux; and a lead-free soldering flux removal system using a pre-rinsing method that can reduce the amount of waste fluid.The invention uses a cleaner composition for lead-free soldering flux, comprising (A) specific glycol ethers; (B) a specific polyoxyalkylene amine; and (C) a chelating agent that is at least one member selected from the group consisting of (c1) aliphatic hydroxycarboxylic acid chelating agents and (c2) (poly)phosphoric acid chelating agents.
Abstract:
There is provided a method of manufacturing a circuit board having a first fixed contact and a second fixed contact that extend substantially orthogonal to each other on the same surface, the life span required for the first fixed contact being longer than that required for the second fixed contact. The method includes: etching a copper foil formed on the entire surface of an insulating substrate to form the patterns of the first and second fixed contacts; polishing the surface of the insulating substrate with buff to remove an oxide film adhered to the copper foil; and sequentially forming a nickel layer having a thickness of about 1 to about 5 μm and a gold layer having a thickness of about 0.01 to about 0.5 μm on each of the first and second fixed contacts. In the method, the buffing direction is substantially aligned with a direction in which a first movable contact slides on the first fixed contact.
Abstract:
An object of the present invention is to provide an electroless nickel-palladium-gold plating method which is able, when performed on a plating target surface such as terminals of a printed wiring board, terminals of other electronic components, and other resin substrates with a fine metal pattern, to prevent abnormal metal deposition on a resin surface which is an undercoat and to provide a high-quality plated surface. Another object of the present invention is to provide a plated product with a high-quality plated surface, particularly such as an interposer and motherboard, and a semiconductor apparatus using the same. These objects were achieved by the electroless nickel-palladium-gold plating method of the present invention, which is a method for plating target objects such as terminals of a printed wiring board and in which at least one surface treatment selected from a treatment with a solution of pH 10 to 14 and a plasma treatment is performed at an optional step after the step of providing a palladium catalyst and before the step of performing electroless palladium plating.