Circuitry for linear control of head flying height using...

Details Circuitry for linear control of head flying height using... Circuitry for linear control of head flying height using...

2006-06-13

2006-06-13

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

07061706

ABSTRACT:
The spacing decrease between pole tips of a write element and a magnetic medium that is associated with the write element is linearly proportional to an input signal, such as an input voltage or current, to a slider flying height controller for a hard disk drive. The flying height controller includes a heater current controller and a multiplexer. The heater current controller receives the input signal and outputs a control current proportional to the input signal. The multiplexer couples the control current to a heating element associated with the write element on a selected slider body during a read operation. The heating element dissipates a power that is proportional to the control current and causes a decrease in the spacing between the pole tips of the write element and the magnetic medium that is linearly proportional to the control current and to the input signal.

REFERENCES:
patent: 6195219 (2001-02-01), Smith
patent: 2003/0039067 (2003-02-01), Hsiao et al.
patent: 2004/0114268 (2004-06-01), Satoh et al.
patent: 2005/0024775 (2005-02-01), Kurita et al.
patent: 2005/0105204 (2005-05-01), Bloodworth et al.
K.B. Klaassen et al., “Nanosecond and Sub-nanosecond Writing Experiments,” IEEE Transactions on Magnetics, vol. 35, No. 2, pp. 625-631, Mar. 1999.

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