Patent ID: 11955266
Assignee: KYOCERA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 4:
5. The inductor core according to claim 1, wherein
the magnetic main body is made of ceramic containing, as a main constituent, ferrite comprised of oxide of Fe, Zn, Ni, and Cu, and
a coefficient of variation CV of an average crystal grain size of the ceramic expressed as Equation (1) stated below is not less than 0.08 and not more than 0.3, (preferable range: coefficient of variation a/x is equal to or less than 0.2)

CV=σ/x  (1),

where x is an average value of the average crystal grain size of the ceramic, and σ is a standard deviation of the average crystal grain size of the ceramic.