US4601099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing a magnetic head
Assignee: Olympus Corp
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Filing: 1983-11-09
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Granted: 1986-07-22
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Expires: 2003-11-09
Abstract
Abstract A magnetic head is made by forming a first half core having at least two substantially parallel plane surfaces and one lateral surface, the distance between the two plane surfaces being equal to or greater than a predetermined track width fixing one of the two plane surfaces of the first half core on part of one plane surface of a non-magnetic substrate so that the one lateral surface of the first half core meets with the one plane surface of the substrate, and depositing a magnetic insulator to a substantially uniform thickness on the other of the two plane surfaces and the one lateral surface of the first half core and the remaining part of the one plane surface of the substrate, thereby forming a gap spacer, depositing the same material for the first half core to a substantially uniform thickness on the gap spacer film, thereby forming a second half core having a thickness equal to or greater than the predetermined track width, and removing at least part of the gap spacer film lying on the other plane surface of the first half core and part of the second half core lying on said part of the gap spacer film to be removed from the other plane surface of the first half core, thereby forming a magnetic head.
Inventors
- 👤 Toyoo Nishiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:47
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/147; G11B5/1475; G11B5/1272; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49043; Y10T29/49046
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
395 words
A method for manufacturing a magnetic head, the method comprising the steps of: forming, from a material block, a first half core having at least two substantially parallel plane surfaces and one lateral surface, wherein a distance between the at least two substantially parallel plane surfaces is at least equal to a predetermined track width; fixing a first of the at least two substantially parallel plane surfaces into part of one plane surface of a non-magnetic substrate, so that the one lateral surface meets with the one plane surface of the substrate, wherein said one plane surface has a remaining part onto which said first half core is not fixed; depositing a magnetic insulator to a substantially uniform thickness onto a second of the at least two substantially parallel plane surfaces onto said one lateral surface, and onto the remaining part of said one plane surface of the substrate, thereby forming a gap spacer film to serve as a gap spacer; depositing a second material, which is the same as the material from which the first half core is formed, to a substantially uniform thickness to a part of the magnetic insulator that is on the second of the at least two substantially parallel plane surfaces, and depositing said second material onto a part of the magnetic insulator that is on said one lateral surface, thereby forming a second half core having a thickness that is at least equal to the predetermined track width; and removing, from regions near and along sliding contact surfaces of said first half core and said second half core which contact surfaces are adapted to be in sliding contact with a magnetic recording tape, said part of the magnetic insulator that is on the second of the at least two substantially parallel plane surfaces, and removing, from said regions, that part of the second material that is on said part of the magnetic insulator that is on the second of the at least two substantially parallel plane surfaces, so that the first half core, part of the magnetic insulator that is on the said one lateral surface that part of the second material which is on the part of the magnetic isulator that is on said one lateral surface, and said remaining part of said one plane surface of the substrate constitute a pair of cores for a magnetic head.
Claim 2
Independent Claim
395 words
A method for manufacturing a magnetic head, the method comprising the steps of: forming, from a material block, a first half core having at least two substantially parallel plane surfaces and one lateral surface, wherein a distance between the at least two substantially parallel plane surfaces is at least equal to a predetermined track width; fixing a first of the at least two substantially parallel plane surfaces into part of one plane surface of a non-magnetic substrate, so that the one lateral surface meets with the one plane surface of the substrate, wherein said one plane surface has a remaining part onto which said first half core is not fixed; depositing a magnetic insulator to a substantially uniform thickness onto a second of the at least two substantially parallel plane surfaces onto said one lateral surface, and onto the remaining part of said one plane surface of the substrate, thereby forming a gap spacer film to serve as a gap spacer; depositing a second material, which is the same as the material from which the first half core is formed, to a substantially uniform thickness to a part of the magnetic insulator that is on the second of the at least two substantially parallel plane surfaces, and depositing said second material onto a part of the magnetic insulator that is on said one lateral surface, thereby forming a second half core having a thickness that is at least equal to the predetermined track width; and removing, from regions near and along sliding contact surfaces of said first half core and said second half core which contact surfaces are adapted to be in sliding contact with a magnetic recording tape, said part of the magnetic insulator that is on the second of the at least two substantially parallel plane surfaces, and removing, from said regions, that part of the second material that is on said part of the magnetic insulator that is on the second of the at least two substantially parallel plane surfaces, so that the first half core, part of the magnetic insulator that is on the said one lateral surface that part of the second material which is on the part of the magnetic isulator that is on said one lateral surface, and said remaining part of said one plane surface of the substrate constitute a pair of cores for a magnetic head.
Claim 3
Dependent Claim
30 words
The method according to claim 1, wherein said first and second half cores are formed from a material selected from the group consisting of Sendust, permalloy and amorphous magnetic material.
Claim 4
Dependent Claim
26 words
The method according to claim 2, wherein said one lateral surface is inclined at an acute angle relative to said one plane surface of the substrate.
Claim 5
Dependent Claim
30 words
The method according to claim 2, wherein said first half core is fixed to said part of said one plane surface of the substrate by means of an adhesive agent.
Claim 6
Dependent Claim
26 words
The method according to claim 2, wherein said magnetic insulator is formed from a material selected from the group consisting of silicon dioxide, chromium and copper.
Claim 7
Dependent Claim
19 words
The method according to claim 5, wherein said magnetic insulator and said second half core are deposited by sputtering.
Claim 8
Dependent Claim
20 words
The method according to claim 5, wherein said magnetic insulator and said second half core are deposited by vacuum evaporation.
Claim 9
Dependent Claim
19 words
The method acording to claim 5, wherein said magnetic insulator and said second half core are deposited by electrodeposition.
Claim 10
Dependent Claim
44 words
The method according to claim 1, wherein said fixing step is preceded by a step of forming in said remaining portion of said one plane surface of the substrate an opening through which a conducting line to form a coil is to be passed.
Claim 11
Dependent Claim
83 words
The method according to claim 1, wherein said part of the magnetic insulator that is on the second of the at least two substantially parallel plane surfaces, and said part of the second material that is on said part of the magnetic insulator that is on the second of the at least two substantially parallel plane surface are removed only from regions near and along sliding contact surfaces of said pair of cores to be in sliding contact with a magnetic recording tape.
Claim 12
Dependent Claim
25 words
The method according to claim 1, wherein said one lateral surface is inclined at an acute angle to said one plane surface of the substrate.
Claim 13
Dependent Claim
30 words
The method according to claim 1, wherein said first half core is fixed to said part of said one plane surface of the substrate by means of an adhesive agent.
Claim 14
Dependent Claim
26 words
The method according to claim 1, wherein said magnetic insulator is formed from a material selected from the group consisting of silicon dioxide, chromium and copper.
References Cited (Backward Citations)
US3751803A
Cited
JPS5274321A
Cited
JPS5545196A
Cited
JPS55135321A
Cited
JPS5671814A
Cited
JPS5788517A
Cited
JPS5868213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |