COIL DEVICE AND MANUFACTURING METHOD OF THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a structure of a low loss and space saving square coil that is downsized by making a gap between coil turns smaller and a manufacturing method of the same without increasing the number of steps and facility cost.SOLUTION: A coil device including a square coil 2 mounted around a columnar core 31 having a square cross section is so configured that hollows are formed in advance at side edge parts of parallel lines with a crushing jig, and each corner part 33 of the columnar core 31 is storable in a circular recessed part 23 formed with a bending jig so that a hollow forming part comes on an inner circumferential side.