| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize a secure rotation stop means by a method wherein grooves where projections provided to a first bobbin are made to pass through when the first bobbin is inserted into a second coil bobbin are provided to the inner circumference of the second bobbin. SOLUTION: A primary winding is wound on the outer circumference of a hollow cylindrical primary coil bobbin 4, and the winding part of a tertiary coil bobbin 1 is inserted into the inside of the primary coil bobbin 4. A pair of rail-like grooves 4a where rotation-stop projections 1a provided in a tertiary coil bobbin 1 passes through when the tertiary coil bobbin 1 is inserted into a primary coil bobbin 4 are provided in the inner circumference of the primary coil bobbin 4. After the tertiary coil bobbin 1 is inserted into the primary coil bobbin 4, the rotation-stop projections 1a provided in the tertiary coil bobbin 1 and projections 1c of a flange 1b are pinched by the grooves 4a. Rotation stop projections 4b are provided in the outer circumference of the primary coil bobbin 4 corresponding to the rotation stop projections 1a of the tertiary coil bobbin 1, and a flange 4c and projections 4d are provided to the outer circumference of the primary coil bobbin corresponding to the flange 1b and projections 1c of the tertiary coil bobbin 1.</p> |
