Patent ID: 7859379

Claim:
A transformer core comprising: a pair of soft ferrite cores ( 4 ) substantially annularly formed by being opposed to each other; a pair of core cases ( 3 ) storing said pair of soft ferrite cores therein respectively so that said pair of ferrite cores are opposed to each other to constitute a magnetic gap; a clamp mechanism ( 2 ) coupling first ends of said pair of core cases with each other in an openable/closable manner; a rectangular spacer ( 5 , 20 ) arranged in said magnetic gap and integrally provided with first convex portions ( 10 , 21 ) on four sides of a first surface while having regions not provided with said first convex portions on at least parts of a pair of opposing sides; and sheet-shaped adhesive layers ( 6 ) bonded to at least the regions of the first surface of said spacer not provided with said first convex portions, for bonding said soft ferrite cores and said spacer to each other.