US4843486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-element magnetic head and method of fabricating the same
Assignee: Hitachi Ltd
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Filing: 1987-04-03
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Granted: 1989-06-27
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Expires: 2007-04-03
Abstract
Abstract A method of fabricating a multi-element magnetic head core is provided in which a plurality of first grooves are formed in a surface of a magnetic block to form a plurality of magnetic circuits, a plurality of second grooves are formed in this surface in directions perpendicular to the first grooves to separate the magnetic circuits from each other, the first and second grooves are filled with a non-magnetic material, the magnetic block is then cut along lines parallel to the second grooves to obtain a plurality of core blocks, and a third groove is formed in each core block from a side wall thereof to isolate the magnetic circuits completely from each other. According to this method, the number of fabrication steps required for forming a multi-element magnetic head core can be reduced, and moreover a multiplicity of magnetic head cores can be formed at the same time.
Inventors
- 👤 Toshikane Yoshimatsu
- 👤 Yoshiki Hagiwara
- 👤 Yoshikazu Tsuji
- 👤 Kazuhiro Momata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:28
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17; G11B5/29; G11B5/295; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048; Y10T29/49053; Y10T29/49055
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
240 words
A method of fabricating a multi-element magnetic head core necessary for forming a multi-element magnetic head having a plurality of magnetic circuits which are isolated from each other by a non-magnetic material, comprising the steps of: preparing a block made of a magnetic material; forming a plurality of first grooves parallel to each other in a surface of said block to form head portions of the magnetic circuits, a predetermined track width of the multi-element magnetic head being delimited by adjacent ones of said first grooves; forming a plurality of second grooves in said surface of said block in directions orthogonal to said first grooves to define the length of said magnetic circuits in a recording-medium travel direction; filling said first grooves and said second grooves with a non-magnetic material; cutting said block along lines, each of which exists between adjacent second grooves and is substantially parallel to the second grooves, to obtain a plurality of core blocks of the multi-element magnetic head having the same shape; and forming a third groove in each core block from that surface thereof which is perpendicular to the surface having the first grooves and the second groove therein and which surface is parallel and proximate to the second groove, so that the magnetic circuits whose head portions are formed by said first grooves are separated from each other by said non-magnetic material with which said first grooves and said second groove are filled.
Claim 2
Independent Claim
240 words
A method of fabricating a multi-element magnetic head core necessary for forming a multi-element magnetic head having a plurality of magnetic circuits which are isolated from each other by a non-magnetic material, comprising the steps of: preparing a block made of a magnetic material; forming a plurality of first grooves parallel to each other in a surface of said block to form head portions of the magnetic circuits, a predetermined track width of the multi-element magnetic head being delimited by adjacent ones of said first grooves; forming a plurality of second grooves in said surface of said block in directions orthogonal to said first grooves to define the length of said magnetic circuits in a recording-medium travel direction; filling said first grooves and said second grooves with a non-magnetic material; cutting said block along lines, each of which exists between adjacent second grooves and is substantially parallel to the second grooves, to obtain a plurality of core blocks of the multi-element magnetic head having the same shape; and forming a third groove in each core block from that surface thereof which is perpendicular to the surface having the first grooves and the second groove therein and which surface is parallel and proximate to the second groove, so that the magnetic circuits whose head portions are formed by said first grooves are separated from each other by said non-magnetic material with which said first grooves and said second groove are filled.
Claim 3
Dependent Claim
20 words
A method of fabricating a multi-element magnetic head core as claimed in claim 1, wherein said non-magnetic material is glass.
Claim 4
Dependent Claim
42 words
A method of fabricating a multi-element magnetic head core as claimed in claim 2, wherein cutting planes of each core block is ground and polished so that each core block has a predetermined length in a direction parallel to the first grooves.
Claim 5
Independent Claim
286 words
A method of fabricating a multi-element magnetic head having a plurality of magnetic circuits which are isolated from each other by a non-magnetic material, comprising the steps of: preparing a block made of a magnetic material; forming a plurality of first grooves parallel to each other in a surface of said block to form head portions of the magnetic circuits, a predetermined track width of the multi-element magnetic head being delimited by adjacent ones of said first grooves; forming a plurality of second grooves in said surface of said block in directions orthogonal to said first grooves to define the length of said magnetic circuits in a recording-medium travel direction; filling said first grooves and said second grooves with a non-magnetc material; cutting said block along lines, each of which exists between adjacent second grooves and is substantially parallel to the second grooves to obtain a plurality of core blocks of the multi-element magnetic head having the same shape; forming a third groove in one of said core blocks from that surface of the core block which is perpendicular to the surface having the first grooves and the second groove therein and which surface is parallel and proximate to the second groove so that end portions of the magnetic circuits whose had portions are formed by said first grooves are separated from each other by said non-magnetic material with which said first grooves and said second groove are filled, thereby forming a first magnetic head core; forming a plurality of winding patterns on a substrate which is made of a magnetic material, through an insulating layer to form a second magnetic head core; and bonding said first magnetic head core to said second magnetic head core.
Claim 6
Independent Claim
286 words
A method of fabricating a multi-element magnetic head having a plurality of magnetic circuits which are isolated from each other by a non-magnetic material, comprising the steps of: preparing a block made of a magnetic material; forming a plurality of first grooves parallel to each other in a surface of said block to form head portions of the magnetic circuits, a predetermined track width of the multi-element magnetic head being delimited by adjacent ones of said first grooves; forming a plurality of second grooves in said surface of said block in directions orthogonal to said first grooves to define the length of said magnetic circuits in a recording-medium travel direction; filling said first grooves and said second grooves with a non-magnetc material; cutting said block along lines, each of which exists between adjacent second grooves and is substantially parallel to the second grooves to obtain a plurality of core blocks of the multi-element magnetic head having the same shape; forming a third groove in one of said core blocks from that surface of the core block which is perpendicular to the surface having the first grooves and the second groove therein and which surface is parallel and proximate to the second groove so that end portions of the magnetic circuits whose had portions are formed by said first grooves are separated from each other by said non-magnetic material with which said first grooves and said second groove are filled, thereby forming a first magnetic head core; forming a plurality of winding patterns on a substrate which is made of a magnetic material, through an insulating layer to form a second magnetic head core; and bonding said first magnetic head core to said second magnetic head core.
Claim 7
Dependent Claim
180 words
A multi-element magnetic head core having a plurality of magnetic circuits, wherein a plurality of first grooves adjacent ones of which delimit a predetermined track width of a multi-element magnetic head are formed parallel to each other in a surface of a block which is made of a magnetic material, and are filled with a non-magnetic material to form head portions of the magnetic circuits and to separate said head portions from each other, wherein a second groove is formed in said surface of said block in a direction perpendicular to said first grooves and is filled with said non-magnetic material to define the length of said magnetic circuits in a recording-medium running direction, and wherein a third groove is formed in said block from that surface thereof which is perpendicular to the surface having said first grooves and said second groove therein and which surface is parallel and proximate to the second groove to separate end portions of said magnetic circuits from each other by said non-magnetic material with which said first grooves and said second groove are filled.
Claim 8
Dependent Claim
180 words
A multi-element magnetic head core having a plurality of magnetic circuits, wherein a plurality of first grooves adjacent ones of which delimit a predetermined track width of a multi-element magnetic head are formed parallel to each other in a surface of a block which is made of a magnetic material, and are filled with a non-magnetic material to form head portions of the magnetic circuits and to separate said head portions from each other, wherein a second groove is formed in said surface of said block in a direction perpendicular to said first grooves and is filled with said non-magnetic material to define the length of said magnetic circuits in a recording-medium running direction, and wherein a third groove is formed in said block from that surface thereof which is perpendicular to the surface having said first grooves and said second groove therein and which surface is parallel and proximate to the second groove to separate end portions of said magnetic circuits from each other by said non-magnetic material with which said first grooves and said second groove are filled.
Claim 9
Dependent Claim
15 words
A multi-element magnetic head core according to claim 5, wherein said non-magnetic material is glass.
Claim 10
Dependent Claim
227 words
A multi-element magnetic head having a plurality of magnetic-conversion parts, comprising: a first magnetic head core having a structure that a plurality of first grooves adjacent ones of which delimit a predetermined track width of the multi-element magnetic head are formed parallel to each other in a surface of a block which is made of a magnetic material, and are filled with a non-magnetic material to form head portions of a plurality of magnetic circuits and to separate said head portions from each other, a second groove is formed in said surface of said block in a direction perpendicular to said first grooves and is filled with said non-magnetic material to define the length of said magnetic circuits in a recording-medium running direction, and a third groove is formed in said block from that surface thereof which is perpendicular to the surface having said first grooves and said second groove therein and which surface is parallel and proximate to the second groove to separate end portions of said magnetic circuits from each other by said non-magnetic material with which said first grooves and said second groove are filled; and a second magnetic head core bonded to said first magnetic head core and having a structure that a plurality of winding patterns are formed on a substrate which is made of a magnetic material, through an insulating layer.
Claim 11
Dependent Claim
227 words
A multi-element magnetic head having a plurality of magnetic-conversion parts, comprising: a first magnetic head core having a structure that a plurality of first grooves adjacent ones of which delimit a predetermined track width of the multi-element magnetic head are formed parallel to each other in a surface of a block which is made of a magnetic material, and are filled with a non-magnetic material to form head portions of a plurality of magnetic circuits and to separate said head portions from each other, a second groove is formed in said surface of said block in a direction perpendicular to said first grooves and is filled with said non-magnetic material to define the length of said magnetic circuits in a recording-medium running direction, and a third groove is formed in said block from that surface thereof which is perpendicular to the surface having said first grooves and said second groove therein and which surface is parallel and proximate to the second groove to separate end portions of said magnetic circuits from each other by said non-magnetic material with which said first grooves and said second groove are filled; and a second magnetic head core bonded to said first magnetic head core and having a structure that a plurality of winding patterns are formed on a substrate which is made of a magnetic material, through an insulating layer.
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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |