Abstract:
A flame retardant is included in a resin phase, and the flame retardant has a maximum number frequency in a range of 1 μm or less when a particle size distribution is evaluated by dividing a particle size into 1 μm increments. The resin phase includes inorganic particles, and the inorganic particles have a maximum number frequency in a range of 0.5 μm or less when the particle size distribution is evaluated by dividing the particle size into 0.5 μm increments. The flame retardant has an average particle size larger than the average particle size of inorganic particles. The number frequency of the flame retardant and the inorganic particles, respectively, decreases with increasing the particle size.
Abstract:
A wiring substrate includes a first conductor pattern, a second conductor pattern, an insulating layer interposed between the first and second patterns and having a through hole, and a plating conductor integrally formed with the second pattern and filling the through hole in the insulating layer such that the plating conductor is in contact with the first pattern. The through hole has an expansion part such that an opening width of the through hole on the first pattern side is widened, and the plating conductor includes a first plating film directly formed on inner wall of the through hole and a second plating film formed on the first plating film such that the minimum thickness of the first plating film in the expansion part is in the range of 55% to 95% of the minimum thickness of the first plating film in the through hole other than the expansion part.
Abstract:
A wiring board includes: an inorganic insulating layer having a via hole formed so as to penetrate the inorganic insulating layer in a thickness direction thereof; a conductive layer disposed on the inorganic insulating layer; and a via conductor which adheres to an inner wall of the via hole and is connected with the conductive layer. The inorganic insulating layer includes a first section including a plurality of inorganic insulating particles partly connected to each other, and a resin portion located in gaps between the inorganic insulating particles, and a second section which is interposed between the first section and the via conductor, including a plurality of inorganic insulating particles partly connected to each other, and a conducting portion composed of part of the via conductor which is located in gaps between the inorganic insulating particles.
Abstract:
A printed wiring board includes an inner conductive-circuit layer, an insulation layer structure including a first insulation layer laminated on inner conductive-circuit layer and a second insulation layer laminated on the first insulation layer, and an outermost conductive-circuit layer laminated on the insulation layer structure and including connection portions such that the connection portions are positioned to mount a component on the insulation layer structure. The second insulation layer is interposed between the first insulation layer and the outermost conductive-circuit layer and has a thickness which is smaller than a thickness of the first insulation layer such that an outer surface of the second insulation layer on an outermost conductive-circuit-layer side is flatter than an inner surface of the second insulation layer on a first insulation-layer side.
Abstract:
A wiring board excellent in electrical reliability is provided. A wiring board includes a first resin layer; an inorganic insulating layer disposed on the first resin layer; a second resin layer disposed on the inorganic insulating layer; and a conductive layer disposed on the second resin layer. The inorganic insulating layer has a first region located in a vicinity of the second resin layer and a second region located on a side opposite to a second resin layer side of the first region. A content ratio of second inorganic insulating particles in the first region is lower than a content ratio of second inorganic insulating particles in the second regions.
Abstract:
The invention provides transient printed circuit board devices, including active and passive devices that electrically and/or physically transform upon application of at least one internal and/or external stimulus.
Abstract:
A printed wiring board includes an inner conductive-circuit layer, an insulation layer structure including a first insulation layer laminated on inner conductive-circuit layer and a second insulation layer laminated on the first insulation layer, and an outermost conductive-circuit layer laminated on the insulation layer structure and including connection portions such that the connection portions are positioned to mount a component on the insulation layer structure. The second insulation layer is interposed between the first insulation layer and the outermost conductive-circuit layer and has a thickness which is smaller than a thickness of the first insulation layer such that an outer surface of the second insulation layer on an outermost conductive-circuit-layer side is flatter than an inner surface of the second insulation layer on a first insulation-layer side.
Abstract:
A highly thermally conductive printed circuit board prevents electrochemical migration by inhibiting elution of copper ions. The printed circuit board is a metal-base printed circuit board including a metal base plate having an insulating resin layer and a copper foil layer stacked thereon in this order. In the printed circuit board, the insulating resin layer contains a first inorganic filler made of inorganic particles having particle diameters of 0.1 nm to 600 nm with an average particle diameter (D50) of 1 nm to 300 nm, and a second inorganic filler made of inorganic particles having particle diameters of 100 nm to 100 μm with an average particle diameter (D50) of 500 nm to 20 μm, and the first inorganic filler and the second inorganic filler are uniformly dispersed in the insulating resin layer.
Abstract:
A method of and device for forming vias on an electronic board (such as a PCB board) comprises forming one or more holes on the electronic board, placing a nanomaterial inside the one or more holes, and forming one or more filled holes on the electronic board. The nanomaterial can be nanocopper, which can be either push/pull into the holes on the electronic board or a combination of push and pull. The push/pull can be performed by using a mechanical device or by a person. A capping layer can be on both side of the via. The vias formed by using the nanomaterials provides a high efficient vertical heat transferring path from one side of the electronic board to the other side of the electronic board.
Abstract:
A wiring board according to an embodiment includes an inorganic insulating layer provided with a via-hole which is a penetrating hole, and a via-conductor which is a penetrating conductor disposed inside the via-hole. The inorganic insulating layer includes first inorganic insulating particles connected to each other and second inorganic insulating particles that are larger in particle size than the first inorganic insulating particles and are connected to each other via the first inorganic insulating particles, and also has, at an inner wall of the via-hole V, a protrusion including at least part of the second inorganic insulating particle. The protrusion is covered with the via-conductor.