US5136775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a magnetic head having wear resisting films
Assignee: Pioneer Corp
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Filing: 1991-06-27
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Granted: 1992-08-11
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Expires: 2011-06-27
Abstract
Abstract In a magnetic head comprising a magnetic core formed by joining core halves of metal magnetic material, wear-resistant films are formed on both sides of the magnetic core in such a manner that they are located at both ends of the operating gaps in the tape slide surface of the magnetic head, with non-magnetic films arranged between the magnetic core and the wear-resistant films, whereby the magnetic head is high in wear resistance and can be manufactured with high efficiency.
Inventors
- 👤 Atsushi Onoe
- 👤 Kazuhiko Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:49
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/255; G11B5/10; G11B5/102; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49055
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
228 words
A method of manufacturing a magnetic head comprising: (a) joining two half core blocks of magnetic core material to form a core block having a winding window passing therethrough in a lengthwise direction, a lengthwise tape sliding surface, a pair of lengthwise side surfaces and a lengthwise operational gap reaching the lengthwise tape sliding surface; (b) cutting a plurality of grooves in said lengthwise tape sliding surface transverse to said lengthwise direction, said grooves each having opposing side surfaces of a predetermined depth and a bottom surface of a predetermined width and being spaced apart, such that individual tape sliding surfaces are formed between adjacent grooves; (c) depositing a hard non-magnetic material on the opposing side surfaces and the bottom surface of each of the grooves, the individual tape sliding surfaces, and the pair of lengthwise side surfaces of said core block to form a film of a hard non-magnetic material; (d) depositing a wear-resistant material on the non-magnetic film covered surfaces of said core block to form a film of wear-resistant material; (e) polishing said individual tape sliding surfaces to expose the magnetic core material thereat, such that the core material is surrounded by the film of hard non-magnetic material and the film of wear-resistant material; and (f) slicing said core block transversely to said lengthwise direction within each of said grooves to form individual magnetic heads.
Claim 2
Independent Claim
228 words
A method of manufacturing a magnetic head comprising: (a) joining two half core blocks of magnetic core material to form a core block having a winding window passing therethrough in a lengthwise direction, a lengthwise tape sliding surface, a pair of lengthwise side surfaces and a lengthwise operational gap reaching the lengthwise tape sliding surface; (b) cutting a plurality of grooves in said lengthwise tape sliding surface transverse to said lengthwise direction, said grooves each having opposing side surfaces of a predetermined depth and a bottom surface of a predetermined width and being spaced apart, such that individual tape sliding surfaces are formed between adjacent grooves; (c) depositing a hard non-magnetic material on the opposing side surfaces and the bottom surface of each of the grooves, the individual tape sliding surfaces, and the pair of lengthwise side surfaces of said core block to form a film of a hard non-magnetic material; (d) depositing a wear-resistant material on the non-magnetic film covered surfaces of said core block to form a film of wear-resistant material; (e) polishing said individual tape sliding surfaces to expose the magnetic core material thereat, such that the core material is surrounded by the film of hard non-magnetic material and the film of wear-resistant material; and (f) slicing said core block transversely to said lengthwise direction within each of said grooves to form individual magnetic heads.
Claim 3
Dependent Claim
41 words
The method of claim 1, wherein said hard non-magnetic material is selected from the group consisting of Cr, Ti and Si and said wear-resistant material is selected from the group consisting of SiO 2 , Al 2 O 3 and TiN.
Claim 4
Dependent Claim
20 words
The method of claim 1, wherein the step of depositing a hard non-magnetic material comprises depositing said material by sputtering.
Claim 5
Dependent Claim
21 words
The method of claim 1, wherein the step of depositing a hard non-magnetic material comprises depositing said material by vacuum deposition.
Claim 6
Dependent Claim
21 words
The method of claim 1, wherein the step of depositing a hard non-magnetic material comprises depositing said material by ion plating.
Claim 7
Dependent Claim
19 words
The method of claim 1, wherein the step of depositing a wear-resistant material comprises depositing said material by sputtering.
Claim 8
Dependent Claim
20 words
The method of claim 1, wherein the step of depositing a wear-resistant material comprises depositing said material by vacuum deposition.
Claim 9
Dependent Claim
20 words
The method of claim 1 wherein the step of depositing a wear-resistant material comprises depositing said material by ion plating.
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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) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |