Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1982-01-04
1983-12-27
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361149, H01F 1300
Patent
active
044234600
ABSTRACT:
Apparatus is disclosed for bulk erasing magnetic tapes spirally wound on a carrier. A pair of magnetic structures are spaced apart by an air gap of sufficient width to receive the tape carrier. Circuitry is provided for producing a rotating magnetic field in the air gap substantially parallel with the tape. Preferably, the magnetic structures take the form of multi-legged iron cores. The cores are mounted so that corresponding legs on opposing cores have the same magnetic polarity. A phase shifter circuit is adapted to supply currents 90.degree. out of phase with one another to selected pairs of legs in the cores to create a rotating magnetic field in the air gap.
REFERENCES:
patent: 2378388 (1945-06-01), Begun
patent: 3191102 (1965-06-01), Lambeir et al.
patent: 3506884 (1970-04-01), McKinley
patent: 3711750 (1973-01-01), Huffman et al.
Jackson Leon D.
Morris Dan O.
Eisenzopf Reinhard J.
LDJ Electronics, Inc.
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