US4052748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetoresistive magnetic head
Assignee: US Philips Corp
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Filing: 1976-10-04
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Granted: 1977-10-04
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Expires: 1996-10-04
Abstract
Abstract A magnetic head for detecting information-representing magnetic fields on a magnetic recording medium and comprising an elongate magneto-resistive element of a magnetically anisotropic material which at its ends has contacts for connection to a current or voltage source. In order to linearize the playback characteristic of the element, the easy axis of magnetization coincides with the longitudinal direction of the element and means are present which force the current to travel at an angle of minimum 15° and maximum 75° with the longitudinal direction. These means consist in particular of equipotential strips provided on the element.
Inventors
- 👤 Karel Elbert Kuijk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:08
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; H; H10; H10N; H10N50/00; H10N50/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A magnetic head for detecting information representing magnetic fields on a magnetic recording medium and comprising an elongate magneto-resistive element of a magnetically anisotropic material which at its ends has contacts for the connection to a current or voltage source, the easy axis of magnetization thereof coinciding with the longitudinal axis of the element and said head further including means to force the current to travel at an angle of minimum 15° and maximum 75° with the longitudinal axis of said element said means including one readily conductive equipotential strip intermediate said current contacts in oblique relationship to said longitudinal axis.
Claim 2
Dependent Claim
101 words
A magnetic head for detecting information representing magnetic fields on a magnetic recording medium and comprising an elongate magneto-resistive element of a magnetically anisotropic material which at its ends has contacts for the connection to a current or voltage source, the easy axis of magnetization thereof coinciding with the longitudinal axis of the element and said head further including means to force the current to travel at an angle of minimum 15° and maximum 75° with the longitudinal axis of said element said means including one readily conductive equipotential strip intermediate said current contacts in oblique relationship to said longitudinal axis.
Claim 3
Dependent Claim
16 words
A magnetic head as claimed in claim 1, characterized in that the angle is approximately 45°.
Claim 4
Dependent Claim
63 words
A magnetic head as claimed in claim 1, wherein said element has two opposite side faces extending generally in the longitudinal axis of said element and said readily conductive equipotential strip is disposed intermediate said contacts and extending transversely across at least one side face of the magnetoresistive element at an angle of minimum 15° and maximum 75° with the longitudinal axis thereof.
Claim 5
Dependent Claim
35 words
A magnetic head as claimed in claim 3, further including a number of mutually parallel equipotential strips intermediate said current contacts disposed at an angle of minimum 15° and maximum 75° with said longitudinal axis.
Claim 6
Dependent Claim
34 words
A magnetic head as claimed in claim 3, further including magnetic means to produce in said magnetoresistive element a magnetic auziliary field having direction which coincides with the longitudinal axis of the magnetoresistive element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |