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US 9,286,918 B1Granted
Write head with coil structure aligned with yoke
AssigneeSeagate Technology LLC
InventorsJianhua Xue, Jiaoming Qiu, Kirill Rivkin, Huaqing Yin, John Wolf, Yonghua Chen
Life of this patent
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Abstract
A write head having a main pole having a pole tip proximate an air bearing surface (ABS), the main pole having a leading side and a trailing side. The write head also includes a yoke having a yoke tip recessed from the ABS, and a helical coil wrapped around the main pole and the yoke. The helical coil has a first turn with its front edge at least substantially aligned with the yoke tip.
Claims9
An apparatus comprising a write head having an air-bearing surface (ABS) and a rotating storage medium, the write head comprising:
- a main pole having a leading side and a trailing side engaging the medium after the leading side has engaged the medium, the main pole having a portion thereof closest to the ABS defining a pole tip;
- a trailing yoke having a portion thereof closest to the ABS defining a yoke tip;
- and
- a coil structure comprising at least two active turns aligned on the trailing side of the main pole and at least two active turns and one dummy turn aligned on the leading side of the main pole and, with the dummy turn more distal from the pole tip than the active turns, with a first turn of the at least two active turns on the trailing side having a cross-sectional diameter and its front edge a distance from the yoke tip that is no more than 20% of the active turn's diameter, and with the trailing yoke between the main pole and the at least two active turns on the trailing side of the main pole.
1 more element
Dependencies are inferred from the claim text.