US4539616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film magnetic head and fabricating method thereof
Assignee: Hitachi Ltd
•
Filing: 1982-07-20
•
Granted: 1985-09-03
•
Expires: 2002-07-20
Abstract
Abstract Herein disclosed is a thin film magnetic head which is so constructed that a conductor layer arranged in a non-magnetic insulating layer isolating two magnetic poles and adapted to form a coil of plural turns has a height made larger than the width and gap thereof. A method of fabricating that head includes the step of forming a non-magnetic insulating layer, the step of etching the insulating layer by using a mask layer formed thereover as a mask, the step of depositing a metal for providing a conductor layer, the step of removing the mask layer together with the metal thereover, and the step forming a coating of a non-magnetic insulating layer thereover, thereby to form the conductor layer. The head thus fabricated has its magnetic recording and reproducing characteristics improved.
Inventors
- 👤 Isamu Yuito
- 👤 Kazuo Shiiki
- 👤 Atsushi Saiki
- 👤 Yoshio Homma
- 👤 Noriyuki Kumasaka
- 👤 Yoshihiro Shiroishi
- 👤 Mitsuhiro Kudo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3109; G11B5/313; G11B5/17; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/4906; Y10T29/49064
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
129 words
A thin film magnetic head comprising: first and second magnetic pole layers; a non-magnetic insulating layer sandwiched between at least said first and second magnetic pole layers; said first and second magnetic pole layers forming an operation gap through said insulating layer; and a conductor layer disposed in said insulating layer and forming a coil of plural turns, with each turn of said coil having a height in a direction extending from the first to the second magnetic pole layer and having a width, and with a space between successive turns of the coil, and wherein the height of each turn is made larger in at least a portion of said coil than the width of said turn and than the space between said turn and an adjacent turn.
Claim 2
Dependent Claim
129 words
A thin film magnetic head comprising: first and second magnetic pole layers; a non-magnetic insulating layer sandwiched between at least said first and second magnetic pole layers; said first and second magnetic pole layers forming an operation gap through said insulating layer; and a conductor layer disposed in said insulating layer and forming a coil of plural turns, with each turn of said coil having a height in a direction extending from the first to the second magnetic pole layer and having a width, and with a space between successive turns of the coil, and wherein the height of each turn is made larger in at least a portion of said coil than the width of said turn and than the space between said turn and an adjacent turn.
Claim 3
Dependent Claim
31 words
A thin film magnetic head as set forth in claim 1, wherein the height of each turn is at least 1.5 times as large as the width of the same turn.
Claim 4
Dependent Claim
31 words
A thin film magnetic head as set forth in claim 2, wherein the height of each turn is at least 2 times as large as the width of the same turn.
Claim 5
Dependent Claim
34 words
A thin film magnetic head as set forth in claim 1, wherein the height of each turn is at least 1.5 times as large as the space between that turn and an adjacent turn.
Claim 6
Dependent Claim
34 words
A thin film magnetic head as set forth in claim 4, wherein the height of each turn is at least 2 times as large as the space between that turn and an adjacent turn.
Claim 7
Dependent Claim
50 words
A thin film magnetic head as set forth in claim 1, wherein said first magnetic pole layer has an inclined portion extending to said operation gap, and each turn of the coil has its height extending in a direction parallel with the inclined portion of said first magnetic pole layer.
Claim 8
Dependent Claim
36 words
A thin film magnetic head as set forth in any of the preceding claims 1 to 5 and 6, wherein at least a portion of said non-magnetic insulating layer is made of a high molecular resin.
Claim 9
Dependent Claim
20 words
A thin film magnetic head as set forth in claim 7, wherein said high molecular resin is a polyimide resin.
Claim 10
Dependent Claim
34 words
A thin film magnetic head as set forth in claim 1, wherein said second magnetic pole layer extends perpendicular to the direction in which the the height of each turn of the coil extends.
Claim 11
Dependent Claim
23 words
A thin film magnetic head as set forth in claim 1, wherein said second magnetic pole layer is the substrate for the head.
Claim 12
Dependent Claim
19 words
A thin film magnetic head as set forth in claim 1, wherein the conductor layer is made of aluminum.
Claim 13
Dependent Claim
19 words
A thin film magnetic head as set forth in claim 1, wherein the conductor layer is made of copper.
Claim 14
Dependent Claim
18 words
A thin film magnetic head as set forth in claim 1, wherein said coil is a flat coil.
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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |