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US 6,608,728 B1Granted
Magnetic disk unit
AssigneeFujitsu Limited
InventorHiroshi Sugiyama
Life of this patent
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Abstract
A magnetic disk unit includes a housing which accommodates a magneto-resistive element and a magnetic disk, a temperature sensor for detecting a temperature within the housing, a circuit for detecting a resistance value of the magneto-resistive element, and a current control unit for controlling a sense current which is supplied to the magneto-resistive element, based on the detected temperature detected and the detected resistance value.
Claims7
A magnetic disk unit comprising:
- a housing which accommodates a magneto-resistive element and a magnetic disk;
- temperature detecting means for detecting a temperature within the housing;
- resistance detecting means for detecting a resistance value of the magneto-resistive element;
- and
- current control means for controlling a sense current which is supplied to the magneto-resistive element, based on the temperature detected by the temperature detecting means and the resistance value detected by the resistance detecting means,
- said current control means supplying to the magneto-resistive element a sense current Is which is described by the following function,
- Is=A*MRRB
- A=c1*T2+c2*T+c3
- B=c4*T2+c5*T+c6
- where T denotes the temperature detected by the temperature detecting means, MRR denotes the resistance value detected by the temperature detecting means, and c1 through c6 denote constants.
7 more elements
A magnetic disk unit comprising:
- a housing which accommodates a magneto-resistive element and a magnetic disk;
- a temperature sensor detecting a temperature within the housing;
- a resistance detecting circuit detecting a resistance value of the magneto-resistive element;
- and
- a current control circuit controlling a sense current which is supplied to the magneto-resistive element, based on the temperature detected by the temperature sensor and the resistance value detected by the resistance detecting circuit,
- said current control circuit supplying to the magneto-resistive element a sense current Is which is described by the following function,
- Is=A*MRRB
- A=c1*T2+c2*T+c3
- B=c4*T2+c5*T+c6
- where T denotes the temperature detected by the temperature sensor, MRR denotes the resistance value detected by the temperature detecting sensor, and c1 through c6 denote constants.
7 more elements
Dependencies are inferred from the claim text.