EP0138580A2
Expired / Lapsed
EP
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Alloy magnetic recording head
Assignee: Panasonic Holdings Corp
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Filing: 1984-10-11
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Granted: —
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Expires: 2004-10-11
Abstract
Abstract An iron-aluminum-silicon (Fe-Ai-Si) series magnetic alloy magnetic head and a manufacturing method therefor. The magnetic head includes front gap forming surfaces which serve as the magnetic tape transportation surfaces and comprise a non-magnetic ceramic films and glass films, and rear gap forming surfaces aiming at junction at the portion reverse to the tape transportation side and comprising either the same materials at the front gap or silver-copper series alloy films. The manufacturing method forms by means of sputtering non-magnetic ceramic films at the front gap forming surfaces of the core pieces and either non-magnetic ceramic films or silver-copper series alloy films at the rear gap forming surfaces, in some cases implanting ion onto the films, and allowing the cores to abut against each other, so that the cores are subjected to heat treatment in a non-oxidizing atmospher less than or more than atmospheric pressure and at a temperature higher than the softening point of the glass and the liquid phase appearance temperature of the silver-copper series alloy.
Inventors
- 👤 Masaki Aoki
- 👤 Masayuki Sakai
- 👤 Hideo Torii
- 👤 Hideyuki Okinaka
- 👤 Hozumi Hirota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 06:19
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/23; G11B5/147; G11B5/1475; G11B5/232; G11B5/235
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
68 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head having narrow gaps of a laterally joining type through gap formating materials and formed of an iron (Fe)-Aluminum (Al)-Silicon (Si) alloy core material and having a front gap including a magnetic gap at a side of the surface on which a tape is transported, and having a rear gap aiming at junction and provided width reversely to said tape transportation surface.
Claim 2
Dependent Claim
68 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head having narrow gaps of a laterally joining type through gap formating materials and formed of an iron (Fe)-Aluminum (Al)-Silicon (Si) alloy core material and having a front gap including a magnetic gap at a side of the surface on which a tape is transported, and having a rear gap aiming at junction and provided width reversely to said tape transportation surface.
Claim 3
Dependent Claim
27 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 1, characterized in that said front gap is formed by a ceramic layer and a glass layer.
Claim 4
Dependent Claim
39 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 2, characterized in that said ceramic layer for said front gap comprises one of zirconium oxide (Zr0 2 ), magnesium oxide (MgO) and spinel (MgO·Al 2 O 3 ).
Claim 5
Dependent Claim
31 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 2, characterized in that glass used as said glass films contains more than 10 per cent quartz (Si 0 2 ).
Claim 6
Dependent Claim
27 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 1, characterized in that said rear gap is formed by a ceramic layer and a glass layer.
Claim 7
Dependent Claim
39 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 5, characterized in that said ceramic layer for said rear gap comprises one of zirconium oxide (ZrO 2 ), magnesium oxide (MgO) and spinel (MgO·Al 2 O 3 ).
Claim 8
Dependent Claim
30 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 5, characterized in that glass used as said glass films contains more than 10 per cent quartz (Si0 2 ).
Claim 9
Dependent Claim
33 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 1, characterized in that said rear gap is formed by one of alloys of silver-copper (Ag-Cu), silver-copper-indium (Ag-Cu-In), silver-copper-tin (Ag-Cu-Sn) and silver-copper-palladium (Ag-Cu-Pd).
Claim 10
Dependent Claim
34 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 8, characterized in that said silver-copper (Ag-Cu) alloy for said rear gap is composed of Ag of 72 wt.% and Cu of 28 wt.%.
Claim 11
Dependent Claim
37 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 8, characterized in that said Ag-Cu series alloy is composed of silver (Ag) of 60 wt.%, copper (Cu) of 27 wt.% and indium (In) of 13 wt.%.
Claim 12
Dependent Claim
41 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 8, characterized in that said silver-copper (Ag-Cu) alloy for said rear gap is composed of silver (Ag) of 60 wt.%, copper (Cu) of 27 wt.% and tin (Sn) of 13 wt.%.
Claim 13
Dependent Claim
42 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 8, characterized in that said silver-copper (Ag-Cu) series alloy for said rear gap is composed of silver (Ag) of 68 wt.%, copper (Cu) of 27 wt.% and palladium (Pd) of 5 wt.%.
Claim 14
Dependent Claim
34 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 4, characterized in that said glass layer for said front gap comprises an alloy of lead oxide-sodium oxide-silicon oxide (PbO-Na 2 O-SiO 2 ).
Claim 15
Dependent Claim
39 words
An iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy head according to claim 13, characterized in that said lead oxide-sodium oxide-silicon oxide (PbO-Na 2 O-SiO 2 ) series glass'for said front gap is composed of Si0 2 of 20 to 80 wt.%.
Claim 16
Dependent Claim
154 words
A manufacturing method for an iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy magnetic head of a laterally abutting type and comprising an non-aluminum-silicon alloy core material and having a front gap with a magnetic gap at a side of the surface on which a magnetic tape is transported and a rear gap aiming at junction and positioned widthwise reversely to said tape transportation surface, said method characterized in that a magnetic gap is formed by providing non-magnetic ceramic films on gap forming surfaces at a pair of iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy core pieces respectively and glass films on said ceramic films respectively, so that thereafter said pair of the magnetic alloy core pieces are subjected to the pressurization and heat treatment in condition of keeping said glass films abutting against each other and at a temperature higher than the softening point of said glass in use and said abutting films are applied with diffused junction.
Claim 17
Dependent Claim
154 words
A manufacturing method for an iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy magnetic head of a laterally abutting type and comprising an non-aluminum-silicon alloy core material and having a front gap with a magnetic gap at a side of the surface on which a magnetic tape is transported and a rear gap aiming at junction and positioned widthwise reversely to said tape transportation surface, said method characterized in that a magnetic gap is formed by providing non-magnetic ceramic films on gap forming surfaces at a pair of iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy core pieces respectively and glass films on said ceramic films respectively, so that thereafter said pair of the magnetic alloy core pieces are subjected to the pressurization and heat treatment in condition of keeping said glass films abutting against each other and at a temperature higher than the softening point of said glass in use and said abutting films are applied with diffused junction.
Claim 18
Dependent Claim
189 words
A manufacturing method for an iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy magnetic head of a laterally abutting type and comprising an iron-aluminum-silicon series magnetic core material and having a front gap as a magnetic gap at a side of the surface on which a magnetic tape is transported and a rear gap aiming at junction and provided widthwise reversely to said tape transportation surface, said method characterized in that a non-magnetic ceramic film is formed at the front gap forming surface of each of said lateral iron-aluminum-silicon alloy cores by means of sputtering, glass films are formed onto said ceramic films respectively, silver-copper series alloy films are formed at said rear gap surfaces at said lateral iron-aluminum-silicon alloy cores, and thereafter said lateral iron-aluminum-silicon series magnetic cores are subjected to heat treatment in condition of abutting at the same kinds of said gap forming surfaces against each other and in a non-oxidizing atmosphere under one atmospheric pressure and at a temperature exceeding that of appearance of liquid phase of said silver-copper-indium series alloy, so that said lateral core blocks are subjected to diffused junction to thereby form said magnetic gap.
Claim 19
Dependent Claim
189 words
A manufacturing method for an iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy magnetic head of a laterally abutting type and comprising an iron-aluminum-silicon series magnetic core material and having a front gap as a magnetic gap at a side of the surface on which a magnetic tape is transported and a rear gap aiming at junction and provided widthwise reversely to said tape transportation surface, said method characterized in that a non-magnetic ceramic film is formed at the front gap forming surface of each of said lateral iron-aluminum-silicon alloy cores by means of sputtering, glass films are formed onto said ceramic films respectively, silver-copper series alloy films are formed at said rear gap surfaces at said lateral iron-aluminum-silicon alloy cores, and thereafter said lateral iron-aluminum-silicon series magnetic cores are subjected to heat treatment in condition of abutting at the same kinds of said gap forming surfaces against each other and in a non-oxidizing atmosphere under one atmospheric pressure and at a temperature exceeding that of appearance of liquid phase of said silver-copper-indium series alloy, so that said lateral core blocks are subjected to diffused junction to thereby form said magnetic gap.
Claim 20
Dependent Claim
184 words
A manufacturing method for an iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy magnetic head of a laterally abutting type and comprising an iron-aluminum-silicon series magnetic core material and having a front gap as a magnetic gap at a side of the surface on which a magnetic tape is transported and a rear gap aiming at junction and provided widthwise reversely to said tape transportation surfaces, said method characterized in that a non-magnetic ceramic film is formed at the front gap forming surface of each of said lateral iron-aluminum-silicon alloy cores by means of sputtering, glass films are formed onto said ceramic films respectively, silver-copper series alloy films are formed at said rear gap surfaces at said lateral iron-aluminum-silicon alloy cores, and thereafter said lateral cores are subjected to hot isostatic pressing (HIP) in condition of abutting at the same kinds of gap forming surfaces against each other and at a temperature higher than the softening point of glass and then a liquid phase appearance temperature of said silver-copper series alloy, so that lateral core blocks are subjected to diffused junction to thereby form said magnetic gap.
Claim 21
Dependent Claim
184 words
A manufacturing method for an iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy magnetic head of a laterally abutting type and comprising an iron-aluminum-silicon series magnetic core material and having a front gap as a magnetic gap at a side of the surface on which a magnetic tape is transported and a rear gap aiming at junction and provided widthwise reversely to said tape transportation surfaces, said method characterized in that a non-magnetic ceramic film is formed at the front gap forming surface of each of said lateral iron-aluminum-silicon alloy cores by means of sputtering, glass films are formed onto said ceramic films respectively, silver-copper series alloy films are formed at said rear gap surfaces at said lateral iron-aluminum-silicon alloy cores, and thereafter said lateral cores are subjected to hot isostatic pressing (HIP) in condition of abutting at the same kinds of gap forming surfaces against each other and at a temperature higher than the softening point of glass and then a liquid phase appearance temperature of said silver-copper series alloy, so that lateral core blocks are subjected to diffused junction to thereby form said magnetic gap.
Claim 22
Dependent Claim
197 words
A manufacturing method for an iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy magnetic head of a laterally abutting type and comprising cores of iron-aluminum-silicon magnetic alloy material and having a front gap with a magnetic gap at a side of the surface on which a magnetic tape is transported and a rear gap aiming at junction of said head and provided widthwise reversely to said tape transportation surface, said method characterized in that non-magnetic ceramic films are formed at said gap forming surfaces (front gap portion) of said cores respectively, glass films are formed on said ceramic films respectively, silver brazing films comprising silver-copper series alloys are formed at said junction surfaces (rear gap portion) respectively, thereafter ion comprising one of nitrogen and argon is implanted into said gap forming surfaces and junction surfaces, a pair of said cores abut against each other so that said gap forming surfaces and junction surfaces are opposite to each other, said pair or cores are subjected to heat. treatment in condition of temperature higher than the softening point of glass and than a temperature of liquid phase appearance of said silver brazing material and then are fixed, thereby forming said magnetic gap.
Claim 23
Dependent Claim
197 words
A manufacturing method for an iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy magnetic head of a laterally abutting type and comprising cores of iron-aluminum-silicon magnetic alloy material and having a front gap with a magnetic gap at a side of the surface on which a magnetic tape is transported and a rear gap aiming at junction of said head and provided widthwise reversely to said tape transportation surface, said method characterized in that non-magnetic ceramic films are formed at said gap forming surfaces (front gap portion) of said cores respectively, glass films are formed on said ceramic films respectively, silver brazing films comprising silver-copper series alloys are formed at said junction surfaces (rear gap portion) respectively, thereafter ion comprising one of nitrogen and argon is implanted into said gap forming surfaces and junction surfaces, a pair of said cores abut against each other so that said gap forming surfaces and junction surfaces are opposite to each other, said pair or cores are subjected to heat. treatment in condition of temperature higher than the softening point of glass and than a temperature of liquid phase appearance of said silver brazing material and then are fixed, thereby forming said magnetic gap.
Claim 24
Dependent Claim
52 words
A manufacturing method for an iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy magnetic head according to claim 18, characterized in that accelerating voltage for ion when said nitrogen ion is implanted into said films is 10 to 200 kV and an amount of ion implantation is 10 13 to 10 17 ion/cm 2 .
Claim 25
Dependent Claim
56 words
A manufacturing method for an iron-aluminum-silicon (Fe-Al-Si) series magnetic alloy magnetic head according to claim 18, characterized in that accelerating voltage for ion when said argon ion is implanted into said films is 15 to 200 kV and an amount of ion implantation is 1 0 13 to 10 17 2 ion / cm 2 .
References Cited (Backward Citations)
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