Abstract:
A circuit substrate includes an insulating layer, a conductor layer laminated on the insulating layer and including a plane layer portion, and a solder resist layer formed on the insulating layer such that the solder resist layer is covering the conductor layer. The plane layer portion of the conductor layer has recess portions or opening portions, and the solder resist layer includes recessed portions covering the recess portions or opening portions of the plane layer portion.
Abstract:
A method for manufacturing a printed wiring board includes fixing a lower metal foil on a support plate, forming a lower insulating layer on the lower metal foil, laminating a core metal layer on the lower insulating layer, patterning the core metal layer such that the core metal layer is formed into a core conductive layer, forming an upper insulating layer on the core conductive layer and lower insulating layer, laminating an upper metal foil on the upper insulating layer, removing the plate from the lower foil such that a core substrate including the lower metal foil, lower insulating layer, core conductive layer, upper insulating layer and upper metal foil is formed, and forming on the core substrate a buildup layer including an insulating layer and a conductive layer. The core metal layer has a thickness which is set to be greater than thicknesses of the lower and upper foils.
Abstract:
A printed wiring board includes multiple insulating layers laminated on each other and each including resin and core, the insulating layers having first-surface sides and second-surface sides on the opposite side, respectively, and including multiple first insulating and second insulating layers, multiple first-surface-side conductive layers formed on the first-surface sides of the first insulating layers, respectively, multiple second-surface-side conductive layers formed on the second-surface sides of the second insulating layers, respectively. The insulating layers include one or more insulating layer having the core positioned such that the core is shifted toward the first-surface side from the center in the thickness direction, the insulating layers include a central insulating layer positioned in the center of the insulating layers, and the first-surface-side and second-surface-side conductive layers are formed such that the first-surface side conductive layers have the total area which is set smaller than the total area of the second-surface-side conductive layers.