Abstract:
Provided are a printed circuit board (PCB), and a manufacturing method thereof. The PCB includes a stacked structure including second and third insulation layers with a first insulation layer interposed therebetween, and a conductive via having first to fourth conductive vias. A second-layer circuit pattern and a third-layer circuit pattern are buried in the first insulation layer, a first-layer circuit pattern is formed on the second insulation layer, and a fourth-layer circuit pattern is formed on the third insulation layer. A first conductive via connects the first-layer circuit pattern and the second-layer circuit pattern, a second conductive via connects the first-layer circuit pattern and the third-layer circuit pattern, a third conductive via connects the second-layer circuit pattern and the fourth-layer circuit pattern, and a fourth conductive via connects the third-layer circuit pattern and the fourth-layer circuit pattern.
Abstract:
A method of fabricating a substrate core structure, and a substrate core structure formed according to the method. The method includes: laser drilling a first set of via openings through a starting insulating layer; filling the first set of via openings with a conductive material to provide a first set of conductive vias; providing first and second patterned conductive layers on opposite sides of the starting insulating layer; providing a supplemental insulating layer onto the first patterned conductive layer; laser drilling a second set of via openings through the supplemental insulating layer; filling the second set of via openings with a conductive material to provide a second set of conductive vias; and providing a supplemental patterned conductive layer onto an exposed side of the supplemental insulating layer, the second set of conductive vias contacting the first patterned conductive layer and the supplemental patterned conductive layer at opposite sides thereof.
Abstract:
A method of manufacturing an interposer is provided, including the steps of providing a sheet with a copper layer and polyimide layer, laser drilling holes in the polyimide layer down to the copper layer, filling the holes with copper and extending the copper above the polyimide layer to define caps, removing portions of the copper layer to form conductive pads, and filling gaps between the conductive pads with an insulator, wherein individual conductive pads are in electrical contact with corresponding individual caps.
Abstract:
A method of manufacturing a metal clad laminate, the method including: forming a barrier layer over one side of a metal layer by performing plating; forming a metal foil over one side of the barrier layer by performing plating; and attaching an insulator to one side of the metal foil. In a further embodiment, the method of manufacturing a metal clad laminate, the method including: attaching a metal foil to one or either side of an insulator; and forming a barrier layer over the metal foil by way of electroplating.
Abstract:
A component-embedded board device has a wiring board in which an electronic component is embedded, a connection member which is conductive and arranged at a surface of the wiring board, and an inner wiring unit which is arranged in the wiring board and connects an electrode of the electronic component with the connection member. The component-embedded board device is further provided with an inspection connection member for an inspection of a faulty wiring of the inner wiring unit, and an inspection wiring unit which is arranged in the wiring board and connects the inspection connection member with one of the electrode and a predetermined portion of the inner wiring unit. The inspection connection member is conductive and arranged at a surface of the wiring board.
Abstract:
A multi-layer printed circuit board including a core structure comprising resin layers and conductor circuits sandwiched by the resin layers, the core structure having a first surface and a second surface on an opposite side of the first surface, a first conductor layer including conductor circuits formed on the first surface of the core structure, and a second conductor layer including conductor circuits formed on the second surface of the core structure. The core structure includes a first via hole and a second via hole, and the first via hole and the second via hole include a metal filling up to the respective top of openings formed in the resin layers, respectively, sandwich one or more conductor circuits in the core structure and are positioned vertically to form a through hole electrically connecting respective ones of the conductor circuits of the first and the second conductor layers.
Abstract:
A method of manufacturing at least a portion of a printed circuit board. The method includes: applying a lamination adhesive on a first plural-layer substrate that includes a plurality of circuit layers with at least one first metal pad on a first side of the first plural-layer substrate; applying a protective film on the lamination adhesive; forming at least one via into the lamination adhesive to expose the at least one metal pad on the first side of the first plural-layer substrate; filling at least one conductive paste into the at least one via formed in the lamination adhesive; removing the protective film to expose the lamination adhesive on the first plural-layer substrate; and attaching the first plural-layer substrate with a second plural-layer substrate that includes a plurality of circuit layers with at least one second metal pad on a second side of the second plural-layer substrate.
Abstract:
A negative photosensitive material is provided which has a lower linear expansion coefficient and a lower hygroscopic expansion coefficient and is excellent in gradational patternability and PI etchability in patterning. The negative photosensitive material comprises:(A) a polyimide precursor having a structural unit represented by the following general formula (1) and a structural unit represented by the following general formula (2), the structural unit represented by the general formula (2) being present in the polyimide precursor in a proportion of less than 30 mol % based on the overall amount of the polyimide precursor; and (B) at least one of a pyridine derivative represented by the following general formula (3) and a pyridine derivative represented by the following general formula (4): wherein R1, R2, R3, R4 and R5, which may be the same or different, are each a C1 to C4 alkyl group, and Ar is an aryl group having a nitro group at its ortho position, wherein R1, R2, R4 and R5, which may be the same or different, are each a C1 to C4 alkyl group, and Ar is an aryl group having a nitro group at its ortho position.
Abstract:
In one embodiment of the present invention, a connecting device of a double-sided wiring board includes a first-side connecting land portion configured by a first-side conductive layer and a first-side connecting conductive layer and a second-side connecting land portion configured by a second-side conductive layer; the first-side connecting land portion and the second-side connecting land portion face each other at respective central portions with an insulating substrate sandwiched therebetween; a substrate hole is formed corresponding to a peripheral end portion of the first-side connecting land portion and a peripheral end portion of the second-side connecting land portion; and the peripheral end portion of the first-side connecting land portion and the peripheral end portion of the second-side connecting land portion are connected to each other via the substrate hole.
Abstract:
A multilayer printed wiring board including insulating layers, conductor layers stacked alternately over the insulating layers, respectively, and viaholes formed in the insulation layers and electrically connecting the conductor layers through the insulation layers. The viaholes include a first group of viaholes and a second group of viaholes. The viaholes in the first group are tapered toward the viaholes in the second group, and the viaholes in the second group are tapered toward the viaholes in the first group. The viaholes in the first group and the the viaholes in the second group are formed in the insulating layers, respectively, and the viaholes are formed by plating openings formed after lamination of respective ones of the insulating layers, and each of the insulating layers is about 100 μm or less in thickness.