US Patent No: 7,933,094
Number of patents in Portfolio can not be more than 2000
Magnetic head for perpendicular magnetic recording having a shield that includes a part recessed from medium facing surface
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Apr 26, 2011
Issued date -
Nov 27, 2007
filing date -
11/987,100
serial no -
In Force
status
Importance
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Abstract
A pole layer has an end face located in a medium facing surface, allows a magnetic flux corresponding to a magnetic field generated by a coil to pass therethrough, and generates a write magnetic field. A shield includes a first layer having an end face located in the medium facing surface at a position forward of the end face of the pole layer along a direction of travel of a recording medium, and a second layer disposed between at least part of the coil and the medium facing surface and magnetically connected to the first layer. The second layer has an end face closer to the medium facing surface, and this end face is located at a distance from the medium facing surface. A nonmagnetic layer made of an inorganic insulating material is provided between the end face of the second layer and the medium facing surface, and a photoresist layer is provided between the end face of the second layer and the nonmagnetic layer.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 6,768,611 Thin film magnetic head causing appropriately suppressed side fringing and method of manufacturing the same | 4 | 2001 | |
| 2006/0126,223 Perpendicular magnetic recording head with return pass layer | 4 | 2005 | |
| 2006/0158,779 Magnetic head for perpendicular magnetic recording, head gimbal assembly, head arm assembly and magnetic disk drive | 3 | 2005 | |
| 2007/0109,684 THIN FILM MAGNETIC HEAD FOR PERPENDICULAR RECORDING | 1 | 2006 | |
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| 2007/0121,248 Magnetic head for perpendicular magnetic recording and method of manufacturing same | 5 | 2005 | |
| 2007/0211,377 Magnetic head for perpendicular magnetic recording and method of manufacturing same | 9 | 2006 | |
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| 7,646,564 Perpendicular magnetic recording head for high frequency drive | 12 | 2006 | |
| 2007/0230,047 Thermally assisted recording of magnetic media using an optical resonant cavity | 5 | 2006 | |
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| 7,633,714 Magnetic head for perpendicular magnetic recording and method of manufacturing same | 5 | 2006 | |
| 2008/0112,081 Perpendicular magnetic write head, method of manufacturing the same, and magnetic recording apparatus | 14 | 2007 | |
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| 4,656,546 Vertical magnetic recording arrangement | 141 | 1985 | |
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| 6,504,675 Perpendicular magnetic recording heads with write pole shaped to reduce skew effects during writing | 127 | 2001 | |
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| 4,672,493 Thin-film magnetic head with a double gap for a recording medium to be magnetized vertically | 78 | 1985 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Oct 26, 2014 |
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Oct 26, 2018 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Oct 26, 2022 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 3.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |