PURPOSE: To improve constant magnetic permeability by providing a notch in a magnetic thin plate for forming a space for winding, and winding up this magnetic thin plate to integrally form a central core and a space for winding.
CONSTITUTION: A notch 12 is provided in a long narrow magnetic thin plate 11 so as to leave a predetermined width on one side of the magnetic thin plate 11 from one end thereof. The magnetic thin plate 11 having such a notch 12 is wound up from the other end thereof, so as to integrally form a central core 13 and a disc-like core 14 on one end of the central core 13. Thus, the notch 12 forms a space for winding defined by these cores 13 and 14, the space having L-shaped cross section as viewed from one side. The pot core, produced in this way, will have less joint between the cores to reduce factors of core loss or degradation in magnetic property possibly occurred in the joint, and thus its constant magnetic permeability can be improved.
FUKUDA NORISUKE
KOBAYASHI TADAHIKO
Next Patent: JPS6024008