Abstract:
A multilayered substrate includes a plurality of circuit boards including a plurality of wiring layers including a grounding layer and a power layer, a solid electrolytic capacitor having an insulative oxide film layer, an electrolytic layer, and a conductor layer sequentially formed on one surface or both surfaces of a foil-like metal substrate, and a conductive substance passing through the circuit board across a thickness thereof. The solid electrolytic capacitor is disposed to be held between the plurality of circuit boards. The conductor layer is connected to a grounding electrode formed on the grounding layer, the foil-like metal substrate being connected to a power electrode formed on the power layer.
Abstract:
A method of manufacturing a reuse paste includes preparing a fiber piece housing paste, producing a filtered recovery paste, and producing a reuse paste. In the preparing of the fiber piece housing paste, a conductive paste including a conductive particle, resin and a latent curing agent, and a fiber piece housing paste including a fiber piece dropping off from a prepreg used for manufacturing a circuit board are prepared. In the producing of the filtered recovery paste, the filtered recovery paste is produced by filtering the fiber piece housing paste, which remains in a paste state, by using a filter. In the production of the reuse paste, the reuse paste is produced by adding at least one of a solvent, resin, and a paste having a different composition from that of the filtered recovery paste into the filtered recovery paste.
Abstract:
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.
Abstract:
PROBLEM TO BE SOLVED: To solve a conventional problem such that, in a high density mounting board sheet including plural pieces of high density mounting board and a peripheral frame, a marking method is used for discriminating an acceptable part suitable for mounting semiconductor chips and electronic components, etc. and a part having a problem which is not suitable for mounting those parts; but since the marking method is easily affected by scattered light from a peripheral portion of a plating layer causing a problem for automatic optical recognition.SOLUTION: In a high density mounting board sheet 13 including plural pieces of high density mounting boards 11 and a peripheral frame 12, a discrimination mark 15 for discriminating an acceptable part suitable for mounting semiconductor chips and electronic components and a part having a problem which is not suitable for mounting those parts is formed with a wiring 19, and peripheral portion of the wiring 19 is coated with a resist 17 to thereby reduce scattered light 32 from the peripheral portion. Thus, the optical automatic recognition performance is enhanced.