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https://drivepatents.com/patents/1112194 · 20 Jun 2001
The secondary coil 17 and central iron core 18 are housed in the case, and the primary winding is wound around the surface of the case, and the primary bobbin 14 is abolished.
https://drivepatents.com/patents/1112194 · 20 Jun 2001
The secondary coil 17 and central iron core 18 are housed in the case, and the primary winding is wound around the surface of the case, and the primary bobbin 14 is abolished.