| 摘要 |
PROBLEM TO BE SOLVED: To provide a wiring board that can has a plurality of electronic components mounted on a top surface of a board body made of an insulating material or in each cavity open on at least one of the top surface and reverse surface of the board body precisely at low cost with a small man-hour, and is easily made compact.SOLUTION: A circuit board 1a comprises: a board body 2a consisting of ceramic layers c1-c5; a cavity C1 open on a top surface 3; a plurality of sets of reverse-surface electrodes 8, 9 formed on the reverse surface 4 of the board body 2a; and a plurality of mounting electrodes 10, 12 formed on the top surface 3 and the bottom surface 6 of the cavity C1, a first conduction passage L1 formed along a thickness of the board body 2a and electrically connecting the plurality of mounting electrodes 10 formed on the top surface 3 and one set of reverse-surface electrodes 8 formed on the reverse surface 4 of the board body 2a to each other and a second conduction passage L2 electrically connecting a plurality of electrodes 12 to be mounted formed on the bottom surface 6 of the cavity C1 and the other set of reverse-surface electrodes 9 formed on the reverse surface 4 of the board body 2a to each other being electrically independent of each other.SELECTED DRAWING: Figure 4 |
