US4907114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mangeto-resistive type read head
Assignee: HGST Japan Ltd
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Filing: 1988-06-03
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Granted: 1990-03-06
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Expires: 2008-06-03
Abstract
Abstract A magneto-resistive type read head has a substrate, a magnetic film exhibiting a magneto-resistive effect arranged in the widthwise direction of the track of a magnetic writing disk, and lead electrodes for feeding an electric current to the track width portion of the magnetic film for reading the signals written in the magnetic writing disk. The magneto-resistive film extends over a width wider than the track width portion and a soft magnetic thin film is formed over the magneto-resistive film on either side of the track width portion to absorb the domain wall so that the magneto-resistive film takes the single domain structure.
Inventors
- 👤 Kazuo Shiiki
- 👤 Masahiro Kitada
- 👤 Hideo Tanabe
- 👤 Hitoshi Nakamura
- 👤 Isamu Yuito
- 👤 Hisashi Takano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:33
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3906; G11B5/3929; G11B5/3932; G11B5/398; G11B5/3987
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A magneto-resistive type read head, comprising: a substrate; a magnetic film having a magneto-resistive effect and arranged in the widthwise direction of a track of a magnetic writing disk; and lead electrodes for feeding an electric current to a track width portion of said magnetic film for reading the signals written in said magnetic writing disk, said magnetic film extending over a width larger than said track width portion; and a second soft magnetic thin film formed in contact with said magnetic film on at least that side of the portion of said magnetic film other than said track width portion which faces said magnetic writing disk.
Claim 2
Dependent Claim
107 words
A magneto-resistive type read head, comprising: a substrate; a magnetic film having a magneto-resistive effect and arranged in the widthwise direction of a track of a magnetic writing disk; and lead electrodes for feeding an electric current to a track width portion of said magnetic film for reading the signals written in said magnetic writing disk, said magnetic film extending over a width larger than said track width portion; and a second soft magnetic thin film formed in contact with said magnetic film on at least that side of the portion of said magnetic film other than said track width portion which faces said magnetic writing disk.
Claim 3
Dependent Claim
25 words
A magneto-resistive type read head according to claim 1, wherein said magnetic film has a length at least ten times as large as its height.
Claim 4
Dependent Claim
28 words
A magneto-resistive type read head according to claim 1, wherein said second soft magnetic thin film is made of the same material as that of said magnetic film.
Claim 5
Dependent Claim
27 words
A magneto-resistive type read head according to claim 1, wherein said second soft magnetic thin film is at least ten times as thick as said magnetic film.
Claim 6
Dependent Claim
40 words
A magneto-resistive type read head according to claim 1, wherein at least that side of the portion other than the track width portion of said magnetic film which faces a magnetic writing disk is thicker than said track width portion.
Claim 7
Dependent Claim
34 words
A magneto-resistive type read head according to claim 5, wherein the magnetic film at the portion other than said track width portion is at least ten times as thick as said track width portion.
References Cited (Backward Citations)
EP0216062A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |