Abstract:
A cleaning solution for electronic materials contains dissolved oxygen gas at a concentration greater than atmospheric saturation concentration, 0.1-10,000 mg/liter of ammonia, and 0.1-10,000 mg/liter of hydrogen peroxide in water. Alternatively, the cleaning solution contains dissolved reducing agents, 0.1-10,000 mg/liter of ammonia, and 0.1-10,000 mg/liter of hydrogen peroxide in water. A method for making the cleaning solution of the present invention is provided. A method for cleaning electronic materials using the cleaning solution of the present invention is also provided.
Abstract:
In a method for manufacturing printed circuit boards, it is started from a carrier plate 1 of isolating material to which a metal foil 2 has been laminated. A pattern of conductive traces 8, 9 is produced from the metal foil 2, for example by a photographic method using a photoresist layer 3. The final conductor structures are produced by chemically depositing a metal layer 10, 11, on the pattern of conductive traces 8,9. The method can be used for manufacturing single-layer or multilayer printed circuit boards with or without through-holes and permits to create conductor structures in the range of 50 micrometers and below.
Abstract:
A method of making a printed circuit board is disclosed wherein metallic seed particles (12) are applied to a surface of the substrate (10). An image of the desired conductor pattern is defined by a maskant layer (14) to permit the subsequent electroless deposition of the conductor material (20, 22) upon the exposed seeded areas of the substrate. Then, the substrate surface is subjected to a plasma discharge to facilitate removal of the seed particles (12). Finally, the substrate (10) is washed in a solvent.
Abstract:
Aspects of the present invention provide patterned electrodes with substantially reduced or removed residue. Aspects of the present invention for removing residue are applicable to any fabricated structure including transparent electrodes. By substantially reducing or removing residue typically associated with methods used to form patterned electrodes, an improvement in performance can be realized by ensuring that the deposition of subsequent materials onto a substrate is not adversely affected by any such residue. In turn, better interconnects can be formed and better coverage of subsequent layers can be achieved. The method for producing patterned electrodes with substantially reduced or removed residue in accordance with the present invention can be used in conjunction with any known method for patterning conductors or electrodes.
Abstract:
A method for evaluating the corrosion risk of a circuit board includes: determining an insulation resistance of said circuit board and judging the corrosion risk of the circuit board from the surface insulation resistance value of said circuit board. A system for evaluating the corrosion risk of a circuit board includes a testing module for determining a surface insulation resistance value of a circuit board and a judging module for judging the corrosion risk of the circuit board from the surface insulation resistance value of said circuit board.