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US 8,947,807 B2Granted
Independently driven write coils
AssigneeSeagate Technology LLC
InventorsKevin Richard Heim, Kirill A. Rivkin, Eric Meloche, John Wolf
Life of this patent
Estimating the term…
Abstract
A writer assembly having two separately driven write coils allows a combined write field generated by the writer assembly to be fine turned and optimized for a particular application. Two preamplifiers may be incorporated into a printed circuit board in order to separately drive the write coils. In other implementations, there may be more than two write coils and corresponding preamplifiers.
Claims14
A method comprising:
- independently driving at least two currents to at least two write coils within a writer assembly using separate preamplifiers, wherein the separate preamplifiers drive the at least two write coils using one or both of different current magnitudes and phases, wherein the at least two write coils generate individual write fields that yield a combined write field directed to a storage media, and wherein the combined write field is directed to the storage media via a shared write pole and a shared return pole to write data to the storage media.
A writer assembly comprising:
- a first write coil independently driven by a first current by a first preamplifier;
- and
- a second write coil independently driven by a second current by a second preamplifier, wherein the first preamplifier drives the first write coil and the second preamplifier drives the second write coil using one or both of different current magnitudes and phases, wherein the first write coil and the second write coil generate individual write fields that yield a combined write field, and wherein the combined write field is directed to the storage media via a shared write pole and a shared return pole to write data to the storage media.
A system comprising:
- a printed circuit board including a first preamplifier and a second preamplifier;
- and
- a writer assembly including a first write coil independently driven by a first current from the first preamplifier and a second write coil independently driven by a second current by the second preamplifier, wherein the first preamplifier drives the first write coil and the second preamplifier drives the second write coil using one or both of different current magnitudes and phases, wherein the first write coil and the second write coil generate individual write fields that yield a combined write field, and wherein the combined write field is directed to the storage media via a shared write pole and a shared return pole to write data to the storage media.
Dependencies are inferred from the claim text.