Patent ID: 8323776

Claim:
An array of sintered ferrite segments each having a rectangular and planar shape that is obtained from a sintered ferrite sheet including a plurality of first dividing grooves having V-shaped cross sections and a plurality of second dividing grooves having V-shaped cross sections, which first and second dividing grooves cooperate with each other to form a grid pattern, each dividing groove of at least one of the plurality of first dividing grooves and the plurality of second dividing grooves having a discontinuous region at each imaginary intersecting portion at which an extension line of the first dividing grooves and an extension line of the second dividing grooves intersect each other, the sintered ferrite sheet being ruptured along the first dividing grooves and the second dividing grooves, into the sintered ferrite segments, wherein at least one side face of each of the sintered ferrite segments includes at least one ruptured section that is ruptured over an entire thickness of the sintered ferrite segment at least one end portion in an extending direction of one of the first dividing groove and the second dividing groove, wherein a length of the discontinuous region in the first dividing grooves is S 1 , a length of the discontinuous region in the second dividing grooves is S 2 , adjacent first dividing grooves are spaced apart from one another by a length L 1 , and adjacent second dividing grooves are spaced apart from one another by a length L 2 , and wherein S 1 ≦0.2×L 2 and S 2 ≦0.2×L 1 .