Patent ID: 7259650

Claim:
A magnetic element comprising: coils; a first core and a second core each of which has a planar plate portion, outer leg portions extending from the planar plate portion and a middle leg portion also extending from the planar plate portion and which is inserted into said coil; and an intermediate core which forms a closed magnetic circuit and which is disposed between said first core and said second core in a manner connecting integrally with said first core and said second core, wherein, the magnetic element has the following relations: S 1 <S 3 and S 1 <S 2 , a cross-sectional area of the middle leg portion of said first core in a direction orthogonal to the direction in which the outer leg portion of said first core extends is S 1 ; a cross-sectional area of said intermediate core in a direction parallel to the direction in which said outer leg portion of said first core extends is S 2 ; and a cross-sectional area of the middle leg portion of said second core in a direction orthogonal to the direction in which said outer leg portion of said second core extends is S 3 .