Magnetic head drive device and magnetic recording/reproducing device using this drive device
AssigneeFujitsu Limited
InventorsJunko Matsui, Yoshihiro Amemiya
Life of this patent
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Abstract
A magnetic head drive device drives a heater element for controlling a protrusion amount of the magnetic head. The heater drive circuit of the heater element of the magnetic head, in which a read element, a write element and a heat element is included, is constructed by the PWM modulation method. A pair of heater wiring lines is made of a path in which the signal polarity is inverted. Therefore cross-talk noise, to the read wiring line, can be decreased even if PWM driving is executed.
Claims20
A magnetic recording/reproducing device, comprising:
- a magnetic recording medium, which rotates;
- a magnetic head, which comprises a write element, a separated read element and a heater element;
- an actuator, which moves said magnetic head in a radius direction of said magnetic recording medium;
- a read amplifier, which is connected to said read element via a pair of read wiring lines and amplifies a signal of said read element;
- a write driver, which is connected to said write element via a pair of write wiring lines and drives said write element;
- and
- a heater drive circuit, which is connected to said heater element via a pair of heater wiring lines and drives said heater element by a pulse width modulation method, wherein
- said pair of heater wiring lines have one path in which signal polarity is inverted and another path in which signal polarity is not inverted with respect to said read wiring lines.
A magnetic recording/reproducing device, comprising:
- a magnetic recording medium, which rotates;
- a magnetic head, which comprises a write element, a separated read element and a heater element;
- an actuator, which moves said magnetic head in a radius direction of said magnetic recording medium;
- a read amplifier, which is connected to said read element via a pair of read wiring lines and amplifies a signal of said read element;
- a write driver, which is connected to said write element via a pair of write wiring lines and drives said write element;
- and
- a heater drive circuit, which is connected to said heater element via a pair of heater wiring lines and drives said heater element by a pulse width modulation method, wherein
- said heater drive circuit outputs pulse width modulation current of said heater element having a center tap as a differential current.
A magnetic head drive device for driving a magnetic head comprises a write element, a read element and a heater element, comprising:
- a read amplifier, which is connected to said read element via a pair of read wiring lines and amplifies a signal of said read element;
- a write driver, which is connected to said write element via a pair of write wiring lines and drives said write element;
- and
- a heater drive circuit, which is connected to said heater element via a pair of heater wiring lines and drives said heater element by a pulse width modulation method, wherein
- said pair of heater wiring lines have one path in which signal polarity is inverted and another path in which signal polarity is not inverted with respect to said read wiring lines.
A magnetic head drive device for driving a magnetic head comprises a write element, a read element and a heater element, comprising:
- a read amplifier, which is connected to said read element via a pair of read wiring lines and amplifies a signal of said read element;
- a write driver, which is connected to said write element via a pair of write wiring lines and drives said write element;
- and
- a heater drive circuit, which is connected to said heater element via a pair of heater wiring lines and drives said heater element by a pulse width modulation method, wherein
- said heater drive circuit outputs a pulse width modulation current of said heater element having a center tap as a differential current.
Dependencies are inferred from the claim text.