Patent US3474492A successfully refreshed from Google Patents.
US5111352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-pole magnetic head with reduced flux leakage
Assignee: PHC Corp
•
Filing: 1989-06-22
•
Granted: 1992-05-05
•
Expires: 2009-06-22
Abstract
Abstract A magnetic recording head including a read pole disposed in a gap between a pair of write poles, and a sensor spaced away from the gap, the read pole adapted to conduct flux to the sensor, each write pole forming a respective cavity between itself and the read pole where the outside of at least one pole is tapered down toward the pole tip, the poles being closer together at their tips than they are near the sensor.
Inventors
- 👤 Shyam C. Das
- 👤 Michael L. Mallary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:42
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3906; G11B5/3916; G11B5/3919; G11B5/3922; G11B5/3925; G11B5/1278; G11B5/187; G11B5/245; G11B5/31; G11B5/3109; G11B5/312; G11B5/313; G11B5/3143; G11B5/332; G11B5/37; G11B5/372; G11B5/374; G11B5/3967
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
100 words
A magnetic recording head comprising a pair of write poles which extend in spaced relationship from a yoke region to a corresponding pair of tips that are separated by a gap, a read pole disposed in said gap, a sensor spaced away from the gap toward said yoke region, the read pole being adapted to conduct flux to the sensor, and at least one of said write poles being configured so that the spacing between said write poles at their tips is less than the spacing between said write poles nearer to said sensor to provide a narrow track definition.
Claim 2
Dependent Claim
100 words
A magnetic recording head comprising a pair of write poles which extend in spaced relationship from a yoke region to a corresponding pair of tips that are separated by a gap, a read pole disposed in said gap, a sensor spaced away from the gap toward said yoke region, the read pole being adapted to conduct flux to the sensor, and at least one of said write poles being configured so that the spacing between said write poles at their tips is less than the spacing between said write poles nearer to said sensor to provide a narrow track definition.
Claim 3
Dependent Claim
15 words
The head of claim 1 further comprising a write coil disposed between said write poles.
Claim 4
Dependent Claim
14 words
The head of claim 1 wherein said at least one write pole is bowed.
Claim 5
Dependent Claim
23 words
The head of claim 1 wherein a portion of the sensor is disposed between said read pole and one of said write poles.
Claim 6
Dependent Claim
13 words
The head of claim 1 wherein said sensor comprises a magneto-resistive (MR) element.
Claim 7
Dependent Claim
12 words
The head of claim 1 wherein the sensor is a Hall sensor.
Claim 8
Dependent Claim
12 words
The head of claim 1 wherein the sensor is an inductive coil.
Claim 9
Independent Claim
139 words
A device for reading flux from magnetically stored data, comprising a magnetic head having a yoke region tapering to a tip region, at least a first magnetic structure and a second magnetic structure extending in spaced relationship from the yoke region to the tip region, the spacing at the tip region being narrower that the spacing toward the yoke region, a first one of the magnetic structures serving as a read pole and having a slot formed therein in said yoke region, and a sensor coupled to the read pole adjacent to the slot whereby, in use, the sensor senses flux from the stored data as the flux passes from the read pole tip region to the read pole yoke region past the slot, surfaces of the read pole that define the slot being tapered to meet the sensor.
Claim 10
Independent Claim
139 words
A device for reading flux from magnetically stored data, comprising a magnetic head having a yoke region tapering to a tip region, at least a first magnetic structure and a second magnetic structure extending in spaced relationship from the yoke region to the tip region, the spacing at the tip region being narrower that the spacing toward the yoke region, a first one of the magnetic structures serving as a read pole and having a slot formed therein in said yoke region, and a sensor coupled to the read pole adjacent to the slot whereby, in use, the sensor senses flux from the stored data as the flux passes from the read pole tip region to the read pole yoke region past the slot, surfaces of the read pole that define the slot being tapered to meet the sensor.
Claim 11
Dependent Claim
48 words
The head of claim 8 wherein the second magnetic structure is a second pole, and further comprising an insulation substrate which includes a surface that defines a recessed contour, and the second pole being disposed over said surface and having a configuration that generally follows said recessed contour.
Claim 12
Dependent Claim
74 words
The head of claim 8 wherein the second structure is a magnetic pole and further comprising a third magnetic pole that extends from said yoke region to said tip region, said third pole being spaced from said second pole by a greater distance in the region of the slot than in said tip region, the second and third poles being coupled together in the yoke region, and the sensor being a magneto-resistive (MR) element.
Claim 13
Independent Claim
109 words
A device for reading flux from magnetically stored data comprising a magnetic head having a yoke region tapering to a tip region, at least a first magnetic structure and a second magnetic structure extending in spaced relationship from the yoke region to the tip region, the spacing at the tip region being narrower than the spacing toward the yoke region, a first one of the magnetic structures serving as a read pole, a sensor coupled to the read pole, and an insulation substrate having a surface that defines a recessed contour, said read pole being disposed over the surface and having a configuration that generally follows said recessed contour.
Claim 14
Independent Claim
109 words
A device for reading flux from magnetically stored data comprising a magnetic head having a yoke region tapering to a tip region, at least a first magnetic structure and a second magnetic structure extending in spaced relationship from the yoke region to the tip region, the spacing at the tip region being narrower than the spacing toward the yoke region, a first one of the magnetic structures serving as a read pole, a sensor coupled to the read pole, and an insulation substrate having a surface that defines a recessed contour, said read pole being disposed over the surface and having a configuration that generally follows said recessed contour.
Claim 15
Dependent Claim
13 words
The head of claim 11 wherein the sensor is a magneto-resistive (MR) element.
Claim 16
Dependent Claim
33 words
The head of claim 12 wherein the read pole has a slot formed therein in the yoke region, surfaces of the read pole that define the slot being tapered to meet the sensor.
Claim 17
Dependent Claim
68 words
The head of claim 13 wherein the second magnetic structure is a second pole, and further comprising a third magnetic pole that extends from said yoke region to said tip region, said third pole being spaced from said and second pole by a greater distance in the region of the slot than in said tip region, the second and third pole being coupled together in the yoke region.
References Cited (Backward Citations)
US3921217A
Cited
JPS5647470A
Cited
US4700252A
Cited
GB2149186A
Cited
EP0154005A2
Cited
JPS6148116A
Cited
US4644432A
Cited
US4750072A
Cited
US4734644A
Cited
US4727643A
Cited
US4698711A
Cited
US4748525A
Cited
US4797766A
Cited
US4754354A
Cited
US4803580A
Cited
US4891725A
Cited
US4885649A
Cited
US4935832A
Cited
US4825318A
Cited
US4907113A
Cited
US4816947A
Cited
US4828966A
Cited
US4912584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-05 | 1995-11-04 | 1996-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-05 | 1999-11-04 | 2000-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-05 | 2003-11-04 | 2004-05-05 | $7700.00 | Window Closed / Lapsed |