| abstract |
A toroidal printed coil includes a plurality of annular holes ( 2 ) and a plurality of center holes ( 3 ) surrounded by the annular holes ( 2 ) in an insulating substrate ( 1 ). A plurality of annular juts ( 4 ), each comprising a portion surrounded by the annular hole ( 2 ) and the center hole ( 3 ), are formed. A printed coil sheet having a plurality of toroidal printed coils, in which a conductor film ( 6 ) is spirally formed at front-and-rear surfaces and side surfaces of annular portions ( 5 ) of the annular juts ( 4 ) with each annular portion taken as an axis, is obtained. With this printed coil sheet, a plurality of toroidal printed coils (P) are obtained by cutting the insulating substrate ( 1 ) off from the individual annular juts ( 4 ). |