US4866555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head
Assignee: Maxell Ltd
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Filing: 1987-11-04
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Granted: 1989-09-12
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Expires: 2007-11-04
Abstract
Abstract A magnetic head having a first core half body constituted by a first non-magnetic base and a magnetic layer made of a high-permeability magnetic material and formed on the first non-magnetic base, and a second core half body constituted by a second non-magnetic base and a magnetic layer made of a high-permeability magnetic material and formed on the second non-magnetic base. This magnetic head is provided with a track width regulation groove communicating with at least one of recording medium sliding surfaces of the first and second non-magnetic bases, the track width regulation groove being filled with the magnetic layer; and abutting surfaces formed on the sides of the track width regulation groove opposite to each other in the widthwise direction of the track, the abutting surfaces being parallel to the surface of mating one of the first and second core half bodies when the abutting surfaces abut there-against. The first and second core half bodies are connected to each other by at least a portion of the abutting surfaces.
Inventors
- 👤 Osamu Inagoya
- 👤 Hideo Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:33
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/255
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
211 words
A magnetic head having a recording medium sliding surface, comprising: a first core half body composed of a first non-magnetic base having a top surface and a side surface, and a magnetic layer made of a high permeability magnetic material and formed on said side surface of said first non-magnetic base; a second core half body composed of a second non-magnetic base having a top surface and a side surface, and a second magnetic layer made of a high permeability magnetic material and formed on said side surface of said second non-magnetic base, said top surfaces of said first and second non-magnetic bases forming said recording medium sliding surface of said magnetic head when said first and second core halves are mated together between said side surface of said first and second non-magnetic bases through said first and second magnetic layers; a track width regulation groove formed in at least one of said surfaces of said first and second non-magnetic bases and opened at said recording medium sliding surface and filled with an associated magnetic layer, and bonding means disposed between said side surfaces of said first and second non-magnetic bases below said recording medium sliding surface for effecting bonding between said side surfaces of said first and second non-magnetic bases.
Claim 2
Dependent Claim
211 words
A magnetic head having a recording medium sliding surface, comprising: a first core half body composed of a first non-magnetic base having a top surface and a side surface, and a magnetic layer made of a high permeability magnetic material and formed on said side surface of said first non-magnetic base; a second core half body composed of a second non-magnetic base having a top surface and a side surface, and a second magnetic layer made of a high permeability magnetic material and formed on said side surface of said second non-magnetic base, said top surfaces of said first and second non-magnetic bases forming said recording medium sliding surface of said magnetic head when said first and second core halves are mated together between said side surface of said first and second non-magnetic bases through said first and second magnetic layers; a track width regulation groove formed in at least one of said surfaces of said first and second non-magnetic bases and opened at said recording medium sliding surface and filled with an associated magnetic layer, and bonding means disposed between said side surfaces of said first and second non-magnetic bases below said recording medium sliding surface for effecting bonding between said side surfaces of said first and second non-magnetic bases.
Claim 3
Dependent Claim
55 words
A magnetic head according to claim 1, wherein a winding window recess having an internal surface is formed in said side surface of at least one of said first and second core half bodies, and wherein said associated magnetic layer is formed over the entire area of the internal surface of said winding window recess.
Claim 4
Dependent Claim
46 words
A magnetic head according to claim 2, wherein said side surface of one of said first and second non-magnetic bases in which no winding window recess is formed has a portion confronting said winding window recess, said portion being formed thereon with said associated magnetic layer.
Claim 5
Dependent Claim
49 words
A magnetic head according to claim 1, wherein said first core half body has a winding window recess, and wherein a recess is formed in a portion of said second non-magnetic base of said second core half body facing said winding window formed in said first core half body.
Claim 6
Dependent Claim
63 words
A magnetic head according to claim 4, wherein a protective layer for protecting said magnetic layer formed at least on a portion of said first core half body forming said winding window is interposed between said magnetic layer of said first core half body and said bonding means including bonding glass for connecting said first and second core half bodies to each other.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |