Choke coil for eliminating common mode noise and normal mode noise
Method of manufacturing a chip transformer Patent #: 5761791
ApplicationNo. 121245 filed on 07/23/1998
US Classes:336/200, Printed circuit-type coil336/83, CORE FORMS CASING336/212, PLURAL PART CORE336/223Having conductor of particular shape (e.g., tapered longitudinally or of noncircular cross section)
ExaminersPrimary: Gellner, Michael L.
Assistant: Mai, Anh
Attorney, Agent or Firm
Foreign Patent References
International ClassH01F 005/00
Foreign Application Priority Data1997-08-04 JP
AbstractA coil element includes a composite member located on a first magnetic substrate, a second magnetic substrate disposed on the composite member and an adhesive layer located therebetween. The composite member includes coil patterns and insulating layers. The adhesive layer is composed of a material having a relative magnetic permeability of more than about 1.0. Alternatively, the insulating layers, excluding a portion which surrounds an overlapping region of coil patterns, are composed of a material having a relative magnetic permeability of more than about 1.0. Alternatively, the insulating layers are provided with holes in the approximate central regions of the insulating layers surrounded by the coil patterns, and the holes are filled with the material of the adhesive layer.