Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Patent
1997-04-07
1999-09-21
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
360 46, 360113, G11B 502
Patent
active
059561971
ABSTRACT:
The invention relates to a system for reading magnetic information, comprising at least one read head H0 provided with two magnetoresistive rods (MR10, MR20) whose electrical resistivities (RMR10, RMR20) vary in mutually opposite senses when they are subjected to a same variation in magnetic field. According to the invention, the reading system comprises a detection module DET which comprises two resistors R of substantially the same resistance value, an amplifier A having one input and one output, and a comparator Cp having two inputs and one output. Each resistor R has a terminal connected to the output terminal (M10, M20) of one of the magnetoresistive rods, while the other terminals of the resistors are interconnected so as to form a common junction point NC. The voltage of the common junction point NC is amplified and compared with a reference voltage Vref by the comparator Cp. The output of the comparator Cp signals an accidental contact between the read head and a foreign body or asperity which may be present on the surface on which the information is stored.
REFERENCES:
patent: 5216561 (1993-06-01), Jagielinski
patent: 5351003 (1994-09-01), Bauer et al.
patent: 5420736 (1995-05-01), Heim et al.
patent: 5715110 (1998-02-01), Nishiyama et al.
patent: 5751510 (1998-05-01), Smith et al.
Desbonnets Eric
Le Luan
Psitos Aristotelis M.
Rubin Steven S.
U.S. Philips Corporation
Wamsley Patrick
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