| 摘要 |
A transformer comprises E-type core parts, a cylindrical core part, a second substrate, first substrates, and an insulating sheet. Each of the second substrate and the fist substrates includes a penetration hole. A coil is wired around the penetration hole. The second substrate is wrapped with an insulating sheet, together with the cylindrical core part. The second substrate and the cylindrical core part are sandwiched between cylindrical core legs of the core parts, through the insulating sheet.
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