US4811146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite magnetic head
Assignee: Mitsubishi Electric Corp
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Filing: 1987-05-13
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Granted: 1989-03-07
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Expires: 2007-05-13
Abstract
Abstract A composite magnetic head for use in recording and/or reproducing information on a magnetic recording medium, comprises a first magnetizable member having a tape abutting face defined therein for sliding engagement with a magnetic recording medium, and a second magnetizable member having a head gap defined therein. The second magnetizable member has a higher saturated magnetic flux density than that of the first magnetizable member and is embedded in the first magnetizable member and positioned so as to traverse the tape abutting face.
Inventors
- 👤 Yoshikazu Niwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/265; G11B5/187
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
A composite magnetic head for use in at least one of recording and reproducing information on a magnetic recording medium, said head comprising a first magnetizable member having a tape abutting face defined therein for sliding engagement with the magnetic recording medium, and a second magnetizable member having a head gap defined therein, said second magnetizable member having a higher saturated magnetic flux density than that of the first magnetizable member and being embedded in the first magnetizable member and being positioned to traverse the tape abutting face, said second magnetizable member is of a generally elongated configuration having a width equal to a width of any one of the recording tracks on the magnetic recording medium, and wherein the head gap is formed at a portion intermediate of a length of the second magnetizable member to extend perpendicular to a lengthwise direction of the second magnetizable member, said gap dividing the second magnetizable member into two bands.
Claim 2
Dependent Claim
158 words
A composite magnetic head for use in at least one of recording and reproducing information on a magnetic recording medium, said head comprising a first magnetizable member having a tape abutting face defined therein for sliding engagement with the magnetic recording medium, and a second magnetizable member having a head gap defined therein, said second magnetizable member having a higher saturated magnetic flux density than that of the first magnetizable member and being embedded in the first magnetizable member and being positioned to traverse the tape abutting face, said second magnetizable member is of a generally elongated configuration having a width equal to a width of any one of the recording tracks on the magnetic recording medium, and wherein the head gap is formed at a portion intermediate of a length of the second magnetizable member to extend perpendicular to a lengthwise direction of the second magnetizable member, said gap dividing the second magnetizable member into two bands.
Claim 3
Dependent Claim
20 words
The composite magnetic head as claimed in claim 1, wherein the second magnetizable member is made of a metallic core.
Claim 4
Dependent Claim
22 words
The composite magnetic head as claimed in claim 1, wherein the second magnetizable member extends slantwise relative to the tape abutting face.
Claim 5
Dependent Claim
32 words
The composite magnetic head as claimed in claim 3, wherein the second magnetizable member has its opposite ends slanted and in flush with opposite planar major surfaces of the first magnetizable member.
Claim 6
Dependent Claim
71 words
The composite magnetic head as claimed in claim 4, wherein the first magnetizable member is comprised of a pair of generally similarly shaped pole pieces having respective gap faces joined together with the gap between the gap faces and wherein said second magnetizable member is of two-piece construction comprised of a pair of bands spaced by the gap, each of said bands having an extension extending along a respective gap face.
Claim 7
Dependent Claim
20 words
The composite magnetic head as claimed in claim 1, wherein the first magnetizable member is made of a ferrite core.
References Cited (Backward Citations)
US4559572A
Cited
DE3447700A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |