Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1991-03-20
1993-03-30
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
307101, H01F 1300
Patent
active
051989590
ABSTRACT:
The invention relates to a demagnetizing device for magnetic recording media, so-called pancakes, wound up in the form of a tape, which device consists of a cylindrical coil (1), the field distribution (3) of which extends essentially parallel to the winding plane (2) of the recording medium (4), while the pancakes (4) can be inserted into the coil (1) in the axial direction by a lifting device (5). The compact form enables an entire pancake stack to be demagnetized at the same time (FIGURE).
REFERENCES:
patent: 3143689 (1964-08-01), Hall
patent: 3938011 (1976-02-01), Littwin
patent: 4346425 (1982-08-01), Gray
patent: 4423460 (1983-12-01), Jackson et al.
patent: 4551782 (1985-11-01), Seely et al.
patent: 4621299 (1986-11-01), Hill
Baumann Manfred
Brandstetter Hermann
Scholtysik Bernd
Toral Jose
BASF - Aktiengesellschaft
Fleming Fritz M.
Keil Herbert B.
Pellinen A. D.
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