Closed loop magnet control for magnetic recording head...

Details Closed loop magnet control for magnetic recording head... Closed loop magnet control for magnetic recording head...

2007-05-11

2009-06-23

Whittington, Kenneth J (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

Reexamination Certificate

active

07550967

ABSTRACT:
A magnetic recording head tester uses closed loop control to accurately control the magnetic field that is generated to test the magnetic recording head. The closed loop control compares the value of the sensed magnetic field to the desired value of the magnetic field and adjusts the magnetic field accordingly. A magnetic field sensor used in the tester may be located in a position that has a substantially different magnetic field magnitude than is experienced by the magnetic recording head. The value of the output signal from the magnetic field sensor is correlated to the magnitude of the magnetic field at the location of the magnetic recording head through calibration. The correlation can then be used to accurately produce the desired magnitude magnetic field at the location of the magnetic recording head.

REFERENCES:
patent: 4514687 (1985-04-01), Van Husen
patent: 5517111 (1996-05-01), Shelor
patent: 5668470 (1997-09-01), Shelor
patent: 5696445 (1997-12-01), Inbar
patent: 6943545 (2005-09-01), Patland et al.
patent: 7187166 (2007-03-01), Sugano

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