SUBSTRATE AND SUBSTRATE PRODUCTION METHOD

摘要

A substrate 1 has a coil 5 that is a choke coil part and, for example, is used for controlling a motor. At the substrate 1, an electronic component mounting part 9 is formed such that a circuit conductor therein is to be exposed to outside. A portion other than an externally connected portion such as the electronic mounting part 9 is covered with substrate-forming resin to form an injection molded circuit board 3. The coil 5 arranged at the substrate 1 (the injection molded circuit board 3) is provided for smoothing current inputted from outside. A core part 7 is formed at the coil 5 by core-forming resin such that the coil part 7 covers at least a center core part 6 of the coil 5.