Abstract: In the coil unit 1A of the power supply device 1, the U-shaped plate 51C constituting the U-shaped terminal 50 is used to electrically connect the print-coil substrates 30, 40. Further, the print-coil substrates 30, 40 constituting the coil unit 1A can be connected to the main circuit substrate 20 also by using the U-shaped terminal 50. Here, the print-coil substrate 30 is connected to the print-coil substrate 40 by using the U-shaped terminal 50, by which soldering for fixing the U-shaped terminal 50 is performed from the lower face side of the print-coil substrate 30. Therefore, as compared with a conventional constitution where soldering is performed from both sides of the stacked print-coil substrates, the print coils can be connected by soldering only from one side face, thus making it possible to reduce the amount of work necessary for connecting the print coils.

Abstract: In the coil unit 1A of the power supply device 1, the U-shaped plate 51C constituting the U-shaped terminal 50 is used to electrically connect the print-coil substrates 30, 40. Further, the print-coil substrates 30, 40 constituting the coil unit 1A can be connected to the main circuit substrate 20 also by using the U-shaped terminal 50. Here, the print-coil substrate 30 is connected to the print-coil substrate 40 by using the U-shaped terminal 50, by which soldering for fixing the U-shaped terminal 50 is performed from the lower face side of the print-coil substrate 30. Therefore, as compared with a conventional constitution where soldering is performed from both sides of the stacked print-coil substrates, the print coils can be connected by soldering only from one side face, thus making it possible to reduce the amount of work necessary for connecting the print coils.

Abstract: A coil apparatus capable of insulating a one-turn coil from an adjacent member while requiring a small number of members. In the coil apparatus according to the present invention, a retaining piece is formed at one end and a pair of coil terminals are formed at another end of a round coil constituted of a metal plate. A fitting wall at which the coil main body is fitted and first and second retaining portions formed by notching two portions of the fitting wall facing opposite each other are formed in the insulating case. The coil main body is fitted at the fitting wall of the insulating case, the coil terminals at one end of the coil are retained at the first retaining portion as the coil is turned and the coil is insulated from the core by retaining the retaining piece at the second retaining portion and thus preventing the coil from becoming lifted.