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US 7,206,154 B2Granted
Method and apparatus for balanced shield shunts, leads and pads for electrical noise reduction in read heads
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsEdward Hin Pong Lee, Robert Langland Smith
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Abstract
A symmetrical read element circuit for reducing electrical and magnetic noise using signal processing, such as a differential preamplifier. The circuits are symmetrically created on both sides of the read element so that the noise is balanced on both leads of the sensor element allowing substantial noise reduction by the signal processing. That is, the present invention provides symmetrical leads and pads designed for equal noise pickup, and for cancellation of the balanced noise.
Claims25
A method for reducing noise in a differential output signal of a magnetic head, comprising:
- providing a sensor element within a magnetic head for detecting a magnetically recorded signal and producing a differential read signal in response thereto;
- providing within the magnetic head a first sensor element signal path having a first physical structure selected to provide first electrical characteristics including a first noise signal component of the read signal on the first sensor element signal path at a first head output terminal;
- and
- providing within the magnetic head a second sensor element signal path having a second physical structure selected to provide second electrical characteristics including a second noise signal component of the read signal on the second sensor element signal path at a second head output terminal;
- and
- wherein design characteristics of the first and second physical structures are selected to be symmetrical for equalizing the first and second electrical characteristics thereby allowing the output signal of the magnetic head from the first and second physical structures to be differentially processed to cancel the first noise signal component with the second noise signal component.
3 more elements
A read channel, comprising:
- a sensor element disposed within a magnetic head for detecting a magnetically recorded signal and producing a differential read signal in response thereto;
- a first sensor element signal path formed within the magnetic head, the first sensor element signal path having a first physical structure selected to provide first electrical characteristics including a first noise signal component of the read signal on the first sensor element signal path at a first head output terminal;
- and
- a second sensor element signal path formed within the magnetic head, the second sensor element signal path having a second physical structure selected to provide second electrical characteristics including a second noise signal component of the read signal on the second sensor element signal path at a second head output terminal;
- wherein design characteristics of the first and second physical structures are selected to be symmetrical for equalizing the first and second electrical characteristics thereby allowing the output signal of the magnetic head from the first and second physical structures to be differentially processed to cancel the first noise signal component with the second noise signal component.
2 more elements
A magnetic storage device, comprising
- magnetic media for storing data thereon;
- a motor for translating the position of the magnetic media;
- and
- an actuator for positioning a magnetic head for reading signals from the magnetic media, the magnetic head comprising:
- a sensor element disposed within a magnetic head for detecting a magnetically recorded signal and producing a differential read signal in response thereto;
- a first sensor element signal path formed within the magnetic head, the first sensor element signal path having a first physical structure selected to provide first electrical characteristics including a first noise signal component of the read signal on the first sensor element signal path at a first head output terminal;
- and
- a second sensor element signal path formed within the magnetic head, the second sensor element signal path having a second physical structure selected to provide second electrical characteristics including a second noise signal component of the read signal on the second sensor element signal path at a second head output terminal;
- wherein design characteristics of the first and second physical structures are selected to be symmetrical for equalizing the first and second electrical characteristics thereby allowing the output signal of the magnetic head from the first and second physical structures to be differentially processed to cancel the first noise signal component with the second noise signal component.
6 more elements
A read channel, comprising:
- means disposed within a magnetic head for detecting a magnetically recorded signal and producing a differential read signal in response thereto;
- first means formed within the means for detecting, for providing a first physical structure selected to provide first electrical characteristics including a first noise signal component of the read signal on the first sensor element signal path at a first head output terminal;
- and
- second means formed within the means for detecting, for providing a second physical structure selected to provide second electrical characteristics including a second noise signal component of the read signal on the second sensor element signal path at a second head output terminal;
- wherein design characteristics of the first and second means for providing physical structures are selected to be symmetrical for equalizing the first and second electrical characteristics thereby allowing the output signal of the means for detecting from the first and second means for providing physical structures to be differentially processed to cancel the first noise signal component with the second noise signal component.
2 more elements
Dependencies are inferred from the claim text.