Printed coil

摘要

A printed coil type transformer having a good magnetic coupling, low loss and good high frequency characteristics as a transformer is provided. The printed coil comprises a plurality of conductor forming planes 54 on which a conductor pattern 55 having one or more turns are formed centering on a core inserting hole 56, laminated pinching an insulating layer, each of the conductor forming plane being provided with outer peripheral connecting holes 51 and 52 provided on the outer peripheral side of the conductor pattern and a plurality of inner peripheral connecting holes 53 provided on the inner peripheral side thereof and the outer and inner peripheral connecting holes being connected with the conductor pattern on own conductor forming plane corresponding to a function of each conductor forming plane, a connecting coil 60 laminated with the laminated conductor forming planes and having a connection pattern 61 for connecting the outer and inner peripheral connecting holes and means 41 through 43 for electrically connecting the outer and inner peripheral connecting holes provided on the laminated conductor forming planes and connecting coil mutually among the layers. <MATH>