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 solid printed circuit board is manufactured by bonding upper and lower printed circuit boards having different shapes and provided with wirings formed on surfaces thereof. A bonding layer is made of insulating material containing thermosetting resin and inorganic filler dispersed therein, and has a via-conductor made of conductive paste filling a through-hole perforated in a predetermined position of the bonding layer. This circuit board provides a packaging configuration achieving small size and thickness and three-dimensional mounting suitable for semiconductors of high performance and multiple-pin structure.
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 wiring board employs a thin insulating substrate having substantially only resin flow as the compression property effect, and has an any-layer IVH structure where at least one core layer is formed without burying wiring. For sufficiently securing an effective compression amount of the crush-allowance of a conductor, the ratio of the thickness of a cover film to that of the electrical insulating substrate is increased, and a via can be formed in the core layer without burying the wiring in the insulating substrate. Thus, a multilayer wiring board having an any-layer IVH structure that can achieve high-density component mountability and wiring storability in an extremely small thickness can be provided.
摘要:
A multilayer printed wiring board is characterized in that the interlayer connection material in the via holes has a lower coefficient of thermal expansion in the thickness direction than the electrically insulating substrate made of insulating material; the interlayer connection is formed at a temperature higher than the operating temperature; and the interlayer connection material is larger in thickness than the interlayer connection material of the same wiring layer at normal temperature. This causes a difference in the coefficient of thermal expansion between the different materials in the thickness direction of the printed wiring board in the environment in which it is used resulting in high connection reliability.
摘要:
A multilayer wiring board employs a thin insulating substrate having substantially only resin flow as the compression property effect, and has an any-layer IVH structure where at least one core layer is formed without burying wiring. For sufficiently securing an effective compression amount of the crush-allowance of a conductor, the ratio of the thickness of a cover film to that of the electrical insulating substrate is increased, and a via can be formed in the core layer without burying the wiring in the insulating substrate. Thus, a multilayer wiring board having an any-layer IVH structure that can achieve high-density component mountability and wiring storability in an extremely small thickness can be provided.
摘要:
In a case of multilayer circuit boards where a plurality of conventional films are used as insulating layers, the films are connected with each other using an adhesive, and therefore, the adhesive sometimes negatively affects reduction in thickness. Therefore, a plurality of two-sided boards with films used therein are pasted together with a paste connection layer interposed therebetween, the paste connection layer being configured such that through holes formed in a prepreg are filled in with a conductive paste which is then cured, and second wires are electrically connected with each other through the conductive paste with which the through holes formed in the paste connection layer in advance are filled in, and thus, a multilayer board can be provided without using an adhesive, and the entirety of the multilayer circuit board can be reduced in thickness.
摘要:
A capacitor sheet includes a laminate sheet, interface-connection feedthrough conductors for electrically connecting faces of the laminate sheet, and capacitor-connection feedthrough conductors. The laminate sheet has at least one laminate which is composed of a power source layer electrode, a grounding layer electrode, and a dielectric layer interposed between the power source layer electrode and the grounding layer electrode. The interface-connection feedthrough conductors are formed in through holes that pass through the dielectric layer, the power source layer electrode, and the grounding layer electrode, and are insulated by insulation walls from the power source layer electrode and the grounding layer electrode provided inside. The capacitor-connection feedthrough conductors are formed in regions where only either the power source layer electrode or the grounding layer electrode is provided, and are connected electrically with either the power source layer electrode or the grounding layer electrode. This configuration makes the electric connection for employing the capacitors and the electric connection between faces of the sheet independent from each other. Thus, it is possible to provide a capacitor sheet in which the adverse effects of inductances of vias are minimized.
摘要:
A multilayer printed wiring board is characterized in that the interlayer connection material in the via holes has a lower coefficient of thermal expansion in the thickness direction than the electrically insulating substrate made of insulating material; the interlayer connection is formed at a temperature higher than the operating temperature; and the interlayer connection material is larger in thickness than the interlayer connection material of the same wiring layer at normal temperature. This causes a difference in the coefficient of thermal expansion between the different materials in the thickness direction of the printed wiring board in the environment in which it is used resulting in high connection reliability.
摘要:
A circuit board including a desired number of electrically insulating layers and wiring layers laminated alternately, and an inner via hole for securing an electrical connection between the wiring layers by compressing and hardening a conductive paste including a conductive particle and a resin. In the electrically insulating layer, a porous sheet is provided a resin sheet at least one surface, and the porous sheet is not impregnated with a resin at least at a central portion. A through hole penetrating the electrically insulating layer in the direction of the thickness of the electrically insulating layer is filled with a conductive paste including a conductive particle and a resin, and pores that are present inside the porous sheet are filled with laminated resin. The average hole diameter of the pores inside the porous sheet may be smaller than the average particle size of the conductive particle. Thereby, it is possible to make the insulating layer of the circuit board securing the interlayer electrically connection by an inner via hole including a conductive paste to be homogenized and ultra-thin and improve the reliability of the connection of the inner via hole.