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US4964007A
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Crystallized glass-bonded amorphous metal magnetic film-non-magnetic substrate magnetic head
Assignee: Panasonic Holdings Corp
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Filing: 1989-05-05
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Granted: 1990-10-16
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Expires: 2009-05-05
Abstract
Abstract A magnetic head having head core constituted by a magnetic material sandwiched on both sides thereof by a substrate material and the magnetic material and the substrate materials are bonded by crystallized glass containing crystals such as gahnite, willemite or the like.
Inventors
- 👤 Mitsuo Satomi
- 👤 Nobuyuki Kaminaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:03
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3109; G11B5/313; G11B5/10; G11B5/105; G11B5/147; G11B5/1475; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49043; Y10T29/49048; Y10T29/49055; Y10T29/49057
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
242 words
A magnetic head, comprising: at least four layers disposed in a layer-to-layer connected sandwich arrangement, each layer having two opposite faces and an outer peripheral edge, a length and width extending generally parallel to said faces thereof and a thickness extending generally perpendicular to said faces thereof; said layers including, in series, a first non-magnetic substrate layer, an amorphous metallic magnetic film layer, a crystallized glass layer, and a second non-magnetic substrate layer; said crystallized glass layer bonding said amorphous metallic magnetic film layer to said second non-magnetic substrate layer; corresponding portions of each said outer peripheral edge of said four layers collectively providing a tape running surface; said amorphous metallic magnetic film layer being divided into two laterally adjacent portions providing a gap extending completely through the thickness of said amorphous metallic magnetic film layer, said gap intersecting said outer peripheral edge of said amorphous metallic film layer whereby said tape running surface includes said gap; said amorphous metallic magnetic film layer having a crystallizing temperature; said crystallized glass layer being made of a glass which has an amorphous state from which it is crystallizable; said glass having, when in said amorphous state, a softening temperature which is lower than said crystallizing temperature of said amorphous metallic magnetic film layer, and said glass having, when in a crystallized state, a melting point which is higher than said softening temperature; said crystallized glass layer having a thickness of 0.1 to 10 μm.
Claim 2
Dependent Claim
242 words
A magnetic head, comprising: at least four layers disposed in a layer-to-layer connected sandwich arrangement, each layer having two opposite faces and an outer peripheral edge, a length and width extending generally parallel to said faces thereof and a thickness extending generally perpendicular to said faces thereof; said layers including, in series, a first non-magnetic substrate layer, an amorphous metallic magnetic film layer, a crystallized glass layer, and a second non-magnetic substrate layer; said crystallized glass layer bonding said amorphous metallic magnetic film layer to said second non-magnetic substrate layer; corresponding portions of each said outer peripheral edge of said four layers collectively providing a tape running surface; said amorphous metallic magnetic film layer being divided into two laterally adjacent portions providing a gap extending completely through the thickness of said amorphous metallic magnetic film layer, said gap intersecting said outer peripheral edge of said amorphous metallic film layer whereby said tape running surface includes said gap; said amorphous metallic magnetic film layer having a crystallizing temperature; said crystallized glass layer being made of a glass which has an amorphous state from which it is crystallizable; said glass having, when in said amorphous state, a softening temperature which is lower than said crystallizing temperature of said amorphous metallic magnetic film layer, and said glass having, when in a crystallized state, a melting point which is higher than said softening temperature; said crystallized glass layer having a thickness of 0.1 to 10 μm.
Claim 3
Dependent Claim
19 words
The magnetic head of claim 1, wherein: said amorphous metallic magnetic film layer is made of a metal-metal alloy.
Claim 4
Dependent Claim
176 words
The magnetic head of claim 2, wherein: said amorphous metallic magnetic film layer is made of one of a metal-metal alloy and a metal-metalloid alloy in which: said metal-metal alloy has the general formula Co-M, in which M is at least one metal selected from the group consisting of Nb, Ti, Ta, Zr and W; and said metal-metalloid alloy contains at least one metal selected from the group consisting of Co, Fe and Ni and at least one metalloid selected from Si, B, C and P; and said crystallized glass is containing crystals of at least one mineral selected from the group consisting of β-eucryptite (Li 2 O.Al 2 O 3 .2SiO 2 ), β-spodumene (Li 2 O.Al 2 O 3 .4SiO2), quartz (SiO 2 ), lithium metasilicate (Li 2 O.SiO 2 ), lithium disilicate (Li 2 O.2SiO 2 ), rutile (TiO 2 ), corodierite (2MgO.2Al 2 O 3 .5SiO 2 ), gahnite (ZnO.Al 2 O 3 ), willemite (2ZnO.SiO 2 ), fluorine-contained phlogopite {NaMg 3 (Si 3 AlO 10 )F 2 }, and the like.
References Cited (Backward Citations)
US3615758A
Cited
US3577634A
Cited
US3639701A
Cited
SU853661A1
Cited
JPS55108922A
Cited
US4422117A
Cited
JPS57179926A
Cited
JPS5812120A
Cited
EP0106321A2
Cited
WO1984003167A1
Cited
US4841401A
Cited
US4602307A
Cited
US4755898A
Cited
JPS60170008A
Cited
JPS60187908A
Cited
US4847983A
Cited
US4794483A
Cited
US4816949A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
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