| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit board equipped with electromagnetic-shielding function for coping with omnidirectional noises for a semiconductor element such as an IC chip mounted on the circuit board. SOLUTION: A circuit board has a semiconductor element 30. The semiconductor element 30 is attached to a wiring board 35 together with a case under the state, wherein the board is covered with the case comprising a metal base material 14, such as a package main body 12 of a metal package. In the wiring board 35, a conductor 38 of the scale which substantially includes the range facing the case so as to hold the semiconductor element 30 is patterned for electromagnetically shielding the semiconductor element 30. |
