JP2016162995A5 - - Google Patents

Claims (6)

A coil bobbin having a rectangular annular body whose corners are chamfered with a round surface and having a concave groove for winding a winding on the outer peripheral side surface of the annular body,
The coil bobbin, wherein a bottom surface of each side portion of the annular body of the concave groove is curved toward an outer peripheral side surface. The winding has a main winding constituting the main part of the number of turns, and a winding adjusting coil connected in series to the main winding and constituting the adjustment part of the number of turns,
The concave groove is formed in a first concave groove in which the main winding is aligned and wound in layers and a bottom surface of the first concave groove, and a second winding in which the winding number adjusting winding is aligned and wound in layers. And a groove of
The coil bobbin according to claim 1, wherein a bottom surface of each side portion of the annular body of the second concave groove is curved toward an outer peripheral side surface. 3. The coil bobbin according to claim 2 , wherein both inner wall surfaces of the first concave groove are inclined outward at an inclination angle of 120 ° with respect to a bottom surface of the first concave groove. 4. The first, on both inner wall surfaces of the bottom and the first groove of the second groove, wherein the guide groove for guiding the winding position of the winding is formed, according to claim 2 Or the coil bobbin of 3 . A coil used as a primary coil of a stationary induction device,
5. A coil comprising a coil bobbin according to any one of claims 1 to 4 and windings arranged in layers in the concave groove of the coil bobbin.   A transformer comprising the coil according to claim 5 as a primary coil.