摘要:
A multilayer printed wiring board (11) is composed of a plurality of printed wiring boards (21a and 21b) each having wiring on its both sides, and a relaxing connection layer (15) for interconnecting the printed wiring boards (21a and 21b). The relaxing connection layer (15) contains an inorganic filler, a thermosetting resin, and a reliever for relieving internal stress. The multilayer printed wiring board (11) is prevented from warpage by making the relaxing connection layer (15) disposed inside it absorb internal stress caused by heating and cooling in a solder reflow process or other processes.
摘要:
A multilayer printed wiring board (11) is composed of a plurality of printed wiring boards (21a and 21b) each having wiring on its both sides, and a relaxing connection layer (15) for interconnecting the printed wiring boards (21a and 21b). The relaxing connection layer (15) contains an inorganic filler, a thermosetting resin, and a reliever for relieving internal stress. The multilayer printed wiring board (11) is prevented from warpage by making the relaxing connection layer (15) disposed inside it absorb internal stress caused by heating and cooling in a solder reflow process or other processes.
摘要:
An upper board having an opening and forming a circuit on a surface layer, a connection sheet between boards having an opening and forming conductive holes filled with conductive paste in through-holes, and a lower board forming a circuit on a surface layer are stacked up, heated and pressed. In particular, the connection sheet between boards is made of a material different from the upper board and the lower board. A multi-layer circuit board having a cavity structure, and a full-layer IVH structure with high interlayer connection reliability can be manufactured.
摘要:
An upper board having an opening and forming a circuit on a surface layer, a connection sheet between boards having an opening and forming conductive holes filled with conductive paste in through-holes, and a lower board forming a circuit on a surface layer are stacked up, heated and pressed. In particular, the connection sheet between boards is made of a material different from the upper board and the lower board. A multi-layer circuit board having a cavity structure, and a full-layer IVH structure with high interlayer connection reliability can be manufactured.
摘要:
In a method of manufacturing a circuit board, a conductive paste is filled in a first hole formed on a first prepreg having both sides to which a first protective film is caused to stick so that a first circuit board is manufactured. A fiber piece housing paste obtained by mixing a fiber piece is recovered to obtain a recovery paste; filtration is carried out through a filter; a solvent or the like is added; and a viscosity, a composition ratio or the like is adjusted so that a reuse paste is fabricated. The reuse paste is filled in a second hole formed on a second prepreg having both sides to which a second protective film is caused to stick.
摘要:
A circuit component built-in module is provided in which a solder that is remelted when the circuit component built-in module is mounted on a motherboard by using the solder is prevented from flowing to the outside of the prescribed electrodes.A first groove (116) is formed in a solder resist (106) located between two electrodes (103) to which a circuit component (104) is connected. A configuration is used in which the space between the first groove (116) and circuit component (104) is filled with a first insulating resin (107).
摘要:
A module includes a ceramic substrate, first and second electrodes provided on the ceramic substrate, a component having third and fourth electrodes connected to the first and second electrodes, respectively, and a resin filled in a space between the component and the ceramic substrate. The ceramic substrate has a surface thereof having a recess formed therein. The first and second electrodes are provided on the surface of the ceramic substrate so that the recess is located between the first and second electrodes. The component is located over the recess and spaced from the ceramic substrate with a space including the recess. The space including the recess is filled with the resin. The module allows each component to be surface mounted at higher bonding strength, thus preventing short-circuit between the electrodes on the substrate and improving the operation reliability.
摘要:
A circuit component built-in module is provided in which a solder that is remelted when the circuit component built-in module is mounted on a motherboard by using the solder is prevented from flowing to the outside of the prescribed electrodes. A first groove (116) is formed in a solder resist (106) located between two electrodes (103) to which a circuit component (104) is connected. A configuration is used in which the space between the first groove (116) and circuit component (104) is filled with a first insulating resin (107).
摘要:
A product and process of making such product in which a varistor is formed by diffusing lead borosilicate-type glass, into a surface of a fired or sintered zinc oxide substrate, i.e., "varistor element," during formation of an electrode on the surface of the substrate. Typically, an electrode paste or material, comprising a mixture or lead borosilicate-type glass frit and Ag powder, is applied to the substrate and provides the lead borosilicate-type glass for diffusing into the substrate. The improvement is that the lead borosilicate-type glass frit for the electrode paste or material comprises a mixture of PbO, B.sub.2 O.sub.3, SiO.sub.2 and at least one metal oxide selected from the group consisting of cobalt oxide, magnesium oxide, yttrium oxide, antimony oxide, manganese oxide, tellurium oxide, lanthanum oxide, cerium oxide, praseodium oxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, terbium oxide, dysprosium oxide, holmium oxide, erbium oxide, thulium oxide, ytterbium oxide and lutetium oxide.
摘要:
A magnetostriction type torque sensor employs a plurality of detector coils arranged in axial arrangement along an objective rotary body. The detector coils are so designed and arranged as to compensate influence of temperature, particularly the error caused due to axial temperature gradient caused in the objective rotary body.