Patent ID: 8256259

Claim:
A method of forming a coil to be bent in a first direction perpendicular to a second direction along which neighboring coils are disposed, the method comprising: preparing the coil made of a conductive raw material formed in a rectangular shape in cross section and having an outer circumference covered with a film, the rectangular shape having first and second linear edge portions, the first edge portion and the second edge portion being perpendicular to each other and sharing a corner portion at each end of the first and second edge portions; compressing the coil to decrease a dimension of the coil in the second direction; and after the coil is compressed, bending the coil to have the first edge portion rounded in the first direction, wherein the coil is compressed in a region including the first edge portion and the corner portion thereof to allow the second edge portion to be tapered, and the coil is compressed to decrease the dimension of the coil in the second direction by an amount that is substantially the same as an amount that the coil would bulge in the second direction if the bending step was performed without first compressing the coil.