Head amplifier with a heat controller
AssigneeTDK Corporation
InventorsNaoki Ohta, Tetsuya Kuwashima
Life of this patent
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Abstract
Timely and proper flying height adjustment is achieved using a controller, which is designed for a magnetic recording and reproducing apparatus that does not use a magnetic head having a heating element for flying height adjustment without any modification. A head amplifier includes a write amplifier for applying a write current to a write head element, a read amplifier for amplifying a read voltage output from a read head element and outputting a read signal, a heating element driver for applying a heat generating current to at least one heating element for adjusting a flying height, and a heat controller for controlling the heating element driver.
Claims11
A head amplifier comprising:
- write amplifying means for applying a write current to a write head element;
- read amplifying means for amplifying a read voltage output from a read head element and outputting a read signal;
- heating element drive means for applying a heat generating current to a heating element for adjusting a flying height;
- and
- heat control means for controlling the heating element drive means during at least one of a read operation and a write operation, the heat control means comprising:
- memory means for storing a state variable table;
- state variable managing means for retrieving a required value from the state variable table;
- output comparing means for comparing the read signal with a corresponding value in the state variable table and outputting a comparing result;
- and
- drive control means for outputting a control signal to the heating element drive means based on the comparing result.
A head amplifier comprising:
- write amplifying means for applying a write current to a write head element;
- read amplifying means for amplifying a read voltage output from a read head element and outputting a read signal;
- heating element drive means for applying a heat generating current to a heating element for adjusting a flying height;
- heat control means for controlling the heating element drive means during at least one of a read operation and a write operation;
- and
- contact detecting means for detecting a contact of a head with a magnetic recording medium based on the read signal and outputting a detection signal indicating the detection of the contact, wherein the heat control means adjusts the heat generating current by controlling the heating element drive means based on the detection signal.
Dependencies are inferred from the claim text.