| 摘要 |
An intermediate board (200) has a board core composed of a core main body (100m) and a sub-core portion (1). The core main body (100m) is formed into a plate shape by a macromolecular material, and is formed with a sub-core housing portion (100h) which is opened and formed on a first main surface by reducing its thickness. The sub-core portion (1) is formed into a plate shape by ceramic, and is housed in the sub-core housing portion (100h) so that its thicknesswise direction matches with that of the core main body (100m). A first terminal array (5) of the board core (100) is formed in a position where it overlaps the sub-core portion (1) in orthographic projection to a reference surface parallel with a plate surface of the board core (100) . The sub-core portion (1) incorporates a laminated ceramic capacitor where a first electrode conductor layer (54), a ceramic layer (52) and a second electrode conductor layer (57) are laminated periodically in this order. The first electrode conductor layer is conductive with a first side first type terminal (5a) and a second side first type terminal (7a). The ceramic layer is composed of a dielectric layer. The second electrode conductor layer is conductive with a first side second type terminal (5b) and a second side second type terminal (7b). In the sub-core housing portion (100h), an inner edge of the cross section along a plane parallel with a plate surface of the sub-core portion (1) has a quadrate shape, and a radius portion with dimension of not less than 0.1 mm to not more than 2 mm is formed on its corners. |
