Independently driven write coils

Patent metadata

Field	Value
Publication number	US-8947807-B2
Application number	US-201213722724-A
Country	US
Kind code	B2
Filing date	Dec 20, 2012
Priority date	Dec 20, 2012
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

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.

First claim

What is claimed is:

1. 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.

2. The method of claim 1 , wherein the at least two write coils are oriented on opposite sides of the shared write pole.

3. The method of claim 1 , wherein each of the at least two write coils have one of a substantially planar orientation and a substantially helical orientation.

4. The method of claim 1 , wherein at least one of the write coils utilizes at least three bond pads located on different turns of the write coil.

5. The method of claim 1 , further comprising independently varying at least one of cumulative magnetic write field angle, gradient, overshoot amplitude, overshoot duration, and phase of at least two write coils.

6. The method of claim 1 , further comprising independently varying an overshoot characteristic of at least two write coils.

7. The method of claim 1 , further comprising independently varying a phase characteristic of at least two write coils.

8. 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.

9. The writer assembly of claim 8 , wherein the first write coil and the second write coil are oriented on opposite sides of the shared write pole.

10. The writer assembly of claim 8 , wherein each of the first write coil and the second write coil have one of a substantially planar orientation and a substantially helical orientation.

11. The writer assembly of claim 8 , wherein at least one of the first write coil and the second write coil utilizes at least three bond pads located on different turns of the write coil.

12. 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.

13. The system of claim 12 , wherein each of the first write coil and the second write coil have one of a substantially planar orientation and a substantially helical orientation.

14. The system of claim 12 , wherein at least one of the first write coil and the second write coil utilizes at least three bond pads located on different turns of the write coil.

Assignees

• Seagate Technology Llc

Inventors

• Heim Kevin Richard
• Rivkin Kirill A
• Meloche Eric
• Wolf John

Classifications

• G11B5/02

  Recording, reproducing, or erasing methods; Read, write or erase circuits therefor · CPC title

• G11B5/012 Primary

  Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) · CPC title

• G11B5/3123

  by using special coil configurations or conductors · CPC title