INDUCTANCE ELEMENT, ITS MANUFACTURING METHOD, AND SWITCHING POWER SOURCE USING IT

摘要

Provided is an inductance element (1) comprising a donut type magnetic core (2), and a bottomed type container (3) for housing the donut type magnetic core (2). The bottomed type container (3) includes a cylindrical outer wall portion, a cylindrical inner wall portion, a bottom portion, an open portion and a hollow portion. The open portion of the bottomed type container (3) is covered with an adhesive portion (4) for fixing the donut type magnetic core (2) and the bottomed type container (3) integrally. The adhesive portion (4) has an extending portion (4a) extending to the inner side of the cylindrical inner wall portion. The ratio (B/A) of the length (B) of the extending portion (4a) to the height (A) of the cylindrical inner wall portion is set within a range of 0.1 to 0.5.