Patent ID: 9153371
Filing Date: 2015-10-06
Classification: H01F

Abstract:
1. A coil device comprising: a first bobbin provided with a first winding part at an outer circumference to which a first wire comprising either a primary coil or a secondary coil is wound; and a second bobbin mounted on the outer circumference of said first bobbin and provided with a second winding part at an outer circumference to which a second wire comprising the other one of said primary coil or said secondary coil is wound, wherein a plurality of partition walls, separating the wires which are adjacent to each other along a scroll axis of said first wire or said second wire, are formed on said first winding part along said scroll axis at predetermined intervals, said scroll axis is arranged perpendicular to a mounting substrate surface, a first bobbin upper collar part is integrally formed on an upper side of a scroll axis direction of said first winding part to project from said first winding part in a radial direction, where a plurality of terminals are arranged on said first bobbin upper collar part, base portions of a core are arranged upward and downward directions of said scroll axis, a section width of each section, which is along said scroll axis and separated by said partition walls, is determined so that only one of said wire can pass through, a height of said partition walls is determined so that two or more of said wire can pass through in such a way that said wire can be wound in two or more layers, a height of said partition walls is higher than a value of m multiplied by d a pair of first and second connecting grooves, connecting the sections which are adjacent to each other, are formed on both sides of each partition wall, said wire is wound in two or more layers in one section and then said wire is wound in two or more layers in a next section, and subsequently said wire is wound in two or more layers by moving said wire to another next section through the first connecting grooves, and a lead part of the first wire or the second wire, which is a start or final end of winding, passes through the second connecting groove, and the second connecting groove works as a path located inside of the second bobbin for leading the lead part to a terminal formed on the upper end of said scroll axis.