Dynamic magnetic information storage or retrieval – Head – Core
Patent
1988-07-11
1991-01-08
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Head
Core
G11B 517
Patent
active
049841173
ABSTRACT:
A device with a read head (16) for magnetically recorded information in electronic data processing plants, in particular in document processing systems, is subject to disturbances by the document operation systems, where modular device units cause magnetic interference fields in the area of the read head (16). In view of the unavoidability of such magnetic interference fields and in order to dispense substantially with a respective shielding for a magnetic read head and in order to generate nevertheless a sufficiently accurate read signal (20), it is disclosed that a read head (16) and a reference head (17) are combined to a read system (33), where the read head and the reference head are respectively associated with the same mechanical and electrical values. The difference signal of the read head (16) and the reference head (17) is composed of the interference signal (19) and a combination of an interference signal and the read signal (20) at the output (21) of the difference circuit (18) and can be fed to a read electronic (23).
REFERENCES:
patent: 3165592 (1965-01-01), Brette
patent: 4008493 (1977-02-01), Pizzuto
patent: 4245268 (1981-01-01), Toshimitsu
patent: 4342059 (1982-07-01), Wray
Dyma Horst
Ketterer Gunter
Nolke Gunter
Canney Vincent P.
Kasper Horst M.
Mannesmann Aktiengesellschaft
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