Patent ID: 6741155
Filing Date: 2004-05-25
Classification: H01F

Abstract:
A transformer comprising:a first substrate which includes a first winding; a second substrate which includes a second winding and an opening in center of the second winding; an insulating material which covers said first substrate and insulates between said first winding and said second winding; and a core which has two ends holding said first substrate covered with said insulating material through said insulating material therebetween, and which forms a part of the magnetic path passing through said first winding and second winding, wherein; said first substrate includes an opening in a center portion of said first winding and a core member arranged in said opening of said first substrate; said insulating material covers said first substrate including said core member; and said core is so formed that said core member of said first substrate is sandwiched between the two ends through said insulating material.