| 摘要 |
PURPOSE:To stably rotate a cap type core at the time of regulating its inductance by bonding the section having high permeability of the core and the section having lower permeability than the high permeability section at the periphery of a cylinder to accurately bond them. CONSTITUTION:A drum-shaped core 12 which is formed by longitudinally splitting it with a high permeability material 12a and a low permeability material 12b is disposed on a terminal board 10, and a coil 13 is wound on the core 12. The core 12 is covered with a cap type core 14, which is composed of a low permeability material 14a and a high permeability material 14b. That is, the material section 14a and the material section 14b of the core 14 are bonded at the cylindrical peripheral surfaces at circular projection 15b and recess 15a. Thus, they can be accurately connected, and since the connecting sections are peripheral surfaces, the pressure of an adjusting screwdriver at the time of adjusting the core is not applied directly thereto but stably rotated.
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