| 摘要 |
Transducer heads of a magnetic tape recording or playback apparatus may be demagnetized by placing a multipolar, permanent magnet adjacent to the transducer head, rotating the magnet to create a reversing flux field and moving the magnet away from the transducer head to diminish gradually the intensity of the field. A simultaneous demagnetizing and cleaning of the transducer head in a cartridge-receiving or cassette-receiving playback or recording apparatus is achieved by having both the magnet and a cleaning tape mounted in a cartridge or cassette and by using the tape drive to cause the magnet to rotate and to move away from the transducer head.
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