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:
Printed circuit boards, cards and chip carriers are fabricated by treating an already circuitized substrate with a swelling agent, then treating the circuitized substrate with a composition containing an alkaline permanganate, a chromate and/or chlorite and then applying a metal layer to coat the circuitized portion of the substrate.
Abstract:
A printed circuit board can be used as a test card. The printed circuit board has a first image and a second image. The first image includes a first array pattern for attaching a package, a first power plane, and a first ground plane. The second image includes a second array pattern for attaching a package, a second power plane, and a second ground plane. A first routing area between the first image and the second image electrically and physically isolates the first power plane from the second power plane. The first routing area also physically isolates the first ground plane from the second ground plane. A first single trace extends through the first routing area. The first single trace electrically connects the first ground plane to the second ground plane.
Abstract:
A composition and method for the removal of ionic salt deposits from a surface using an organic solvent of low polarity and a complexing agent. The complexing agent is chosen from a group which includes podands, cryptands, and coronands. The method provides nearly complete removal of ionic salt deposits with a single washing of the surface with the low polar cleaning mixture.
Abstract:
An electrical circuit with large creepage isolation distances is provided. In some embodiments, the electrical circuit is capable of increasing creepage isolation distances by many multiples over traditional electrical circuits. In one embodiment, an electrical circuit comprises a ground circuit optically coupled to a floating circuit, and an isolated circuit optically coupled to the floating circuit. The circuits can be optically coupled with opto-isolators, for example. The isolated circuit can have a creepage isolation distance at least twice as large as a traditional circuit. In some embodiments, “n” number of floating circuits can be optically coupled between the ground circuit and the isolated circuit to increase the total creepage isolation distance by a factor of “n”. Methods of use are also described.
Abstract:
The invention relates to a high-voltage insulation circuit board which is used in an electric power apparatus such as an electric power converter or the like such as power semiconductor device, inverter module, or the like and provides an insulation circuit board in which electric field concentration at the end sections of a wiring pattern is reduced, partial discharging is suppressed, and a reliability is high. According to the invention, there is provided an insulation circuit board having: a metal base substrate; and wiring patterns which are formed onto at least one of the surfaces of the metal base substrate through an insulation layer, characterized in that between two adjacent wiring patterns in which an electric potential difference exists among the wiring patterns, at least one or more wiring patterns or conductors which are in contact with the insulation layer and have an electric potential in a range of the electric potential difference between the adjacent wiring patterns are arranged. According to the invention, the electric field concentration at the end sections of the wiring pattern to which a high voltage is applied is reduced and partial-discharge-resistant characteristics are improved.
Abstract:
Apparatus and method for directly detecting the atmospheric conditions leading to creep corrosion of printed circuit boards (PCBs) well before the PCBs in the computers start suffering from creep corrosion. The embodiment indicates the propensity of the air towards creep corrosion on PCBs. Additionally, to avoid the false reading due to condensed moisture, condensed moisture may be avoided by using a heater attached to the creep corrosion monitor that keeps the creep corrosion monitor above the dew point temperature.
Abstract:
A sleeve structure includes an electrically insulating protective sleeve having clips that retain and capture component pins and regulate a mounting distance of the electrical component from a wiring structure. A method of component wiring assembly is also included.
Abstract:
An electronic device includes an electronic component provided with leads. A printed circuit board has a front surface and a back surface and is provided with through holes and a groove hole. The through holes are capable of receiving the leads, respectively. The groove hole is formed so as to cross straight lines that connect the through holes. A first insulating spacer is provided on the groove hole between the leads so as to isolate the leads from each other and is positioned between the electronic component and the front surface of the printed circuit board. A second insulating spacer is inserted through the groove hole from the back surface of the printed circuit board and engages with the first insulating spacer so as to isolate end portions of the leads from each other.
Abstract:
In a method for improving the corrosion resistance of an electronic component, particularly of conductors of a printed circuit board, wherein after the conductors are produced out of copper a further treatment follows, the conductors are subjected to a pretreatment prior to the further treatment, wherein ions or ion impurities present on the surface of the conductors are removed by a purifying treatment and/or treated with at least one complexing composition, whereby the production of conductors and/or printed circuit boards having improved corrosion resistance, particularly when used in surroundings having higher moisture and optionally higher temperatures, becomes possible.