US4890378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing a magnetic head core having a magnetic film
Assignee: Canon Inc
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Filing: 1988-08-19
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Granted: 1990-01-02
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Expires: 2008-08-19
Abstract
Abstract A magnetic head in which a first magnetic film made of a material of high saturation magnetic flux density is deposited on the surface of a block made of a high permeability material and which contains a groove for winding. A nonmagnetic film made of a nonmagnetic material and serving as a magnetic gap is formed on the first magnetic film; and a second magnetic film made of a material of high saturation magnetic flux density is further formed on the nonmagnetic film. A reinforcing block is arranged on the second magnetic film and has a nonmagnetic material portion exposed to a slide surface of a recording medium. The high permeability material block, the first magnetic film and the second magnetic film together constitute a magnetic core, and the second magnetic film is bonded with the reinforcing block.
Inventors
- 👤 Takashi Suzuki
- 👤 Toshio Yamanaka
- 👤 Hiroyuki Suzuki
- 👤 Tsuyoshi Orikasa
- 👤 Takeshi Sawada
- 👤 Makoto Kameyama
- 👤 Kiyozumi Niizuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:40
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/1875; G11B5/1877; G11B5/1878; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49043; Y10T29/49055; Y10T29/49057; Y10T29/49067
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
219 words
A manufacturing method of a magnetic head core, comprising: (a) a first step of forming a groove for a winding in one surface of a magnetic block which is made of a first magnetic material of high permeability; (b) a second step of depositing a first magnetic film made of a second magnetic material of high saturation magnetic flux density on the surface of the magnetic block on which the groove is formed; (c) a third step of depositing a nonmagnetic film made of a nonmagnetic material for serving as a magnetic gap on the first magnetic film deposited on the surface of the magnetic block; (d) a fourth step of depositing a second magnetic film made of the second magnetic material on the nonmagnetic film deposited on the first magnetic film; (e) a fifth step of bonding a reinforcing block with the second magnetic film deposited on the nonmagnetic film, the reinforcing block including a nonmagnetic exposure portion, and said fifth step follows said fourth step; and (f) a sixth step of forming a magnetic head core which includes the magnetic block, the first magnetic film, the nonmagnetic film, the second magnetic film and the reinforcing block, so that the nonmagnetic exposure portion exposes to a sliding face for sliding a recording medium of the magnetic head core.
Claim 2
Dependent Claim
219 words
A manufacturing method of a magnetic head core, comprising: (a) a first step of forming a groove for a winding in one surface of a magnetic block which is made of a first magnetic material of high permeability; (b) a second step of depositing a first magnetic film made of a second magnetic material of high saturation magnetic flux density on the surface of the magnetic block on which the groove is formed; (c) a third step of depositing a nonmagnetic film made of a nonmagnetic material for serving as a magnetic gap on the first magnetic film deposited on the surface of the magnetic block; (d) a fourth step of depositing a second magnetic film made of the second magnetic material on the nonmagnetic film deposited on the first magnetic film; (e) a fifth step of bonding a reinforcing block with the second magnetic film deposited on the nonmagnetic film, the reinforcing block including a nonmagnetic exposure portion, and said fifth step follows said fourth step; and (f) a sixth step of forming a magnetic head core which includes the magnetic block, the first magnetic film, the nonmagnetic film, the second magnetic film and the reinforcing block, so that the nonmagnetic exposure portion exposes to a sliding face for sliding a recording medium of the magnetic head core.
Claim 3
Dependent Claim
16 words
A method according to claim 1, wherein the magnetic block consists of an oxide magnetic material.
Claim 4
Dependent Claim
20 words
A method according to claim 1, wherein both of the first and second magnetic films are made of magnetic alloy.
Claim 5
Dependent Claim
54 words
A method according to claim 1, wherein the reinforcing block includes a first portion formed from a nonmagnetic material and a second portion formed from a magnetic material, and the first portion is arranged on a side of the sliding surface and the second portion is arranged on another side of the sliding surface.
Claim 6
Dependent Claim
17 words
A method according to claim 1, wherein the reinforcing block is formed from only a nonmagnetic material.
Claim 7
Dependent Claim
34 words
A method according to claim 1, wherein the first magnetic film is deposited on only an adjacent portion to the sliding surface on the surface of the magnetic block where the groove is formed.
Claim 8
Dependent Claim
34 words
A method according to claim 1, wherein the first magnetic film is deposited on a portion excluding the inside of the groove on the surface of the magnetic block where the groove is formed.
Claim 9
Dependent Claim
26 words
A method according to claim 1, wherein the first magnetic film is deposited on the whole surface of the magnetic block where the groove is formed.
Claim 10
Dependent Claim
33 words
A method according to claim 1, wherein on the sliding surface, at least a part of the boundary between the magnetic block and the first magnetic film is parallel with the nonmagnetic film.
Claim 11
Dependent Claim
17 words
A method according to claim 9, wherein the thickness of the first and second magnetic films differ.
Claim 12
Dependent Claim
217 words
A manufacturing method of a magnetic head core, comprising: (a) a first step of forming a first surface on a magnetic block which is made of a first magnetic material of high permeability; (b) a second step of depositing a first magnetic film made of a second magnetic material of high saturation magnetic flux density on the first surface; (c) a third step of forming a second surface arranged to be oblique to the first surface on the first magnetic film; (d) a fourth step of depositing a nonmagnetic film made of a nonmagnetic material for serving as a magnetic gap on the second surface; (e) a fifth step of depositing a second magnetic film made of the second magnetic material on the nonmagnetic film deposited on the second surface; (f) a sixth step of bonding a reinforcing block with the second magnetic film deposited on the nonmagnetic film, the reinforcing block including a nonmagnetic exposure portion, and said sixth step follows said fifth step; and (g) a seventh step of forming a magnetic head core which includes the magnetic block, the first magnetic film, the nonmagnetic film, the second magnetic film and the reinforcing block, so that the nonmagnetic exposure portion exposes to a sliding surface for sliding a recording medium of the magnetic head core.
Claim 13
Dependent Claim
217 words
A manufacturing method of a magnetic head core, comprising: (a) a first step of forming a first surface on a magnetic block which is made of a first magnetic material of high permeability; (b) a second step of depositing a first magnetic film made of a second magnetic material of high saturation magnetic flux density on the first surface; (c) a third step of forming a second surface arranged to be oblique to the first surface on the first magnetic film; (d) a fourth step of depositing a nonmagnetic film made of a nonmagnetic material for serving as a magnetic gap on the second surface; (e) a fifth step of depositing a second magnetic film made of the second magnetic material on the nonmagnetic film deposited on the second surface; (f) a sixth step of bonding a reinforcing block with the second magnetic film deposited on the nonmagnetic film, the reinforcing block including a nonmagnetic exposure portion, and said sixth step follows said fifth step; and (g) a seventh step of forming a magnetic head core which includes the magnetic block, the first magnetic film, the nonmagnetic film, the second magnetic film and the reinforcing block, so that the nonmagnetic exposure portion exposes to a sliding surface for sliding a recording medium of the magnetic head core.
Claim 14
Dependent Claim
26 words
A method according to claim 11, wherein on the sliding surface, the first and second surfaces are straight lines which are not parallel with each other.
Claim 15
Dependent Claim
25 words
A method according to claim 11, wherein on the sliding surface, the first surface is a curve and the second surface is a straight line.
Claim 16
Dependent Claim
226 words
A manufacturing method of a magnetic head core, comprising; (a) a first step of forming a groove for winding in one surface of a magnetic block which is made of a first magnetic material of high permeability; (b) a second step of depositing a first magnetic film made of a second magnetic material of high saturation magnetic flux density on a portion excluding the inside of the groove on the surface of the magnetic block where the groove is formed; (c) a third step of depositing a nonmagnetic film made of a nonmagnetic material for serving as a magnetic gap on the first magnetic film deposited on the surface of the magnetic block; (d) a fourth step of depositing a second magnetic film made of the second magnetic material on the nonmagnetic film deposited on the first magnetic film; (e) a fifth step of bonding a reinforcing block with the second magnetic film deposited on the nonmagnetic film, the reinforcing block including a nonmagnetic exposure portion, and said fifth step follows said fourth step; and (f) a sixth step of forming a magnetic head core which includes the magnetic block, the first magnetic film, the nonmagnetic film, the second magnetic film and the reinforcing block, so that the nonmagnetic exposure portion exposes to a sliding surface for sliding a recording medium of said magnetic head core.
Claim 17
Dependent Claim
226 words
A manufacturing method of a magnetic head core, comprising; (a) a first step of forming a groove for winding in one surface of a magnetic block which is made of a first magnetic material of high permeability; (b) a second step of depositing a first magnetic film made of a second magnetic material of high saturation magnetic flux density on a portion excluding the inside of the groove on the surface of the magnetic block where the groove is formed; (c) a third step of depositing a nonmagnetic film made of a nonmagnetic material for serving as a magnetic gap on the first magnetic film deposited on the surface of the magnetic block; (d) a fourth step of depositing a second magnetic film made of the second magnetic material on the nonmagnetic film deposited on the first magnetic film; (e) a fifth step of bonding a reinforcing block with the second magnetic film deposited on the nonmagnetic film, the reinforcing block including a nonmagnetic exposure portion, and said fifth step follows said fourth step; and (f) a sixth step of forming a magnetic head core which includes the magnetic block, the first magnetic film, the nonmagnetic film, the second magnetic film and the reinforcing block, so that the nonmagnetic exposure portion exposes to a sliding surface for sliding a recording medium of said magnetic head core.
Claim 18
Dependent Claim
33 words
A method according to claim 14, wherein on the sliding surface, at least a part of the boundary between the magnetic block and the first magnetic film is parallel with the nonmagnetic film.
Claim 19
Dependent Claim
17 words
A method according to claim 15, wherein the thickness of the first and second magnetic films differ.
Claim 20
Dependent Claim
28 words
A method according to claim 14, wherein on the sliding surface, the boundary between the first magnetic film and the magnetic block is oblique to the nonmagnetic film.
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) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |