EP0152064A2
Expired / Lapsed
EP
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Thin film magnetic head and manufacturing method thereof
Assignee: Hitachi Ltd
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Filing: 1985-02-07
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Granted: —
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Expires: 2005-02-07
Abstract
Abstract In a thin film magnetic head (10) including a substrate (1) comprising a non-magnetic material, magnetic cores (2, 3) comprising magnetic thin films formed on the substrate so as to form a ring-shaped magnetic circuit, a non-magnetic gap material (5) located at a part of the magnetic cores so as to form a head gap, and windings (7) wound around the magnetic cores so as to have linkage with the magnetic circuit, a non-magnetic pattern material (8) for defining the value of the gap depth (Gd) is provided on at least a gap depth side portion within a region surrounded by the magnetic circuit of the magnetic cores on the substrate.
Inventors
- 👤 Mitsuo Abe
- 👤 Katsuo Konishi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 19:14
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3163; G11B5/3103; G11B5/3106
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
120 words
A thin film magnetic head (10) comprising: a substrate (1) of a non-magnetic material; magnetic cores (2, 3) made of magnetic thin films formed on said substrate, said magnetic cores forming a ring-shaped magnetic circuit; a non-magnetic gap material (5) for forming a head gap of said magnetic cores; windings (7) having linkage with said magnetic circuit of said magnetic cores; a non-magnetic pattern material (8) provided on said non-magnetic substrate for the purpose of defining a gap depth (Gd), said non-magnetic pattern material being at least disposed within a region surrounded by said magnetic circuit of said magnetic cores, and said non-magnetic pattern material being disposed at the side of the head gap depth formed by said non-magnetic material.
Claim 2
Dependent Claim
120 words
A thin film magnetic head (10) comprising: a substrate (1) of a non-magnetic material; magnetic cores (2, 3) made of magnetic thin films formed on said substrate, said magnetic cores forming a ring-shaped magnetic circuit; a non-magnetic gap material (5) for forming a head gap of said magnetic cores; windings (7) having linkage with said magnetic circuit of said magnetic cores; a non-magnetic pattern material (8) provided on said non-magnetic substrate for the purpose of defining a gap depth (Gd), said non-magnetic pattern material being at least disposed within a region surrounded by said magnetic circuit of said magnetic cores, and said non-magnetic pattern material being disposed at the side of the head gap depth formed by said non-magnetic material.
Claim 3
Dependent Claim
74 words
A thin film magnetic head (10) according to Claim 1, wherein said non-magnetic pattern material is so shaped as-to have two boundaries (ℓ 1 , ℓ 2 ) which make an acute angle and which approach the front face of said magnetic core, and wherein a winding hole (6) throughing said non-magnetic pattern material to pass through said windings is provided far from the front face of said magnetic core beyond said two boundaries.
Claim 4
Dependent Claim
20 words
A thin film magnetic head (10) according to Claim 2, wherein the shape of said non-magnetic pattern material is trapezoidal.
Claim 5
Dependent Claim
54 words
A thin film magnetic head (10) according to Claim 2, wherein said non-magnetic pattern material includes a second boundary (12) forming a gap depth defining face, said second boundary (12) jointing said boundaries (ℓ 1 , Q 2 ), said second boundary being near and parallel to the front face of said magnetic core.
Claim 6
Dependent Claim
28 words
A thin film magnetic head (10) according to Claim 4, wherein the length of said second boundary (12) for defining said gap depth does not exceed 100 µm.
Claim 7
Dependent Claim
143 words
A thin film magnetic head (10) according to Claim 2, wherein said magnetic cores include: first and second head cores (2a, 3) forming a first magnetic circuit so as to surround a first gap material (5a) of said non-magnetic material and the first gap depth defining material (8c) of said non-magnetic pattern material; and the third and fourth head cores (2b, 3) forming the second magnetic circuit so as to surround the second gap material (5b) of said non-magnetic material and the second gap depth defining material (8d) of said non-magnetic pattern material, and wherein the first and second winding holes (6a, 6b) respectively for passing through the first and second coils (7a, 7b) of said windings are provided through said first gap depth defining material and said non-magnetic substrate and through said second gap depth defining material and said non-magnetic substrate, respectively.
Claim 8
Dependent Claim
44 words
A thin film magnetic head (10) according to Claim 6, wherein each of said first and second gap depth defining materials has two boundaries which make an acute angle and which approach the front face of said first, second, third and fourth head cores.
Claim 9
Dependent Claim
20 words
A thin film magnetic head (10) according to Claim 7, wherein the shape of said non-magnetic pattern material is trapezoidal.
Claim 10
Dependent Claim
47 words
A thin film magnetic head (10) according to Claim 7, wherein each of said first and second gap depth defining materials has a second boundary (12) which crosses said and which forms a gap depth defining face nearly parallel to the front face of said head core.
Claim 11
Dependent Claim
25 words
A thin film magnetic head (10) according to Claim 9, wherein the length of said gap depth defining boundary (12) does not exceed 100 µm.
Claim 12
Dependent Claim
102 words
A thin film magnetic head (10) according to Claim 1, wherein said magnetic cores include: the first and second front cores (2, 3) having front portions which confront each other with said non-magnetic material (gap material) therebetween and having rear portions which are open-circuited by said non-magnetic pattern material; and a rear core (9) for magnetically coupling the rear portions of said front cores, and wherein said windings comprise a thin film coil which surrounds at least one joint portion where said rear core is jointed respectively to said first and second front cores and which has linkage with said joint portions.
Claim 13
Dependent Claim
20 words
A thin film magnetic head (10) according to Claim 11, wherein the shape of said non-magnetic pattern material is trapezoidal.
Claim 14
Dependent Claim
49 words
A thin film magnetic head (10) according to Claim 7, wherein each of said first and second gap depth defining materials has a second boundary (12) which crosses said two boundaries and which forms a gap depth defining face nearly parallel to the front face of said head core.
Claim 15
Dependent Claim
26 words
A thin film magnetic head (10) according to Claim 9, wherein the length of said gap depth defining second boundary (12) does not exceed 100 µm.
Claim 16
Dependent Claim
243 words
A thin film magnetic head (10) according to Claim 1, wherein said magnetic cores include: the first and second front cores (2a, 3) having front portions which confront each other with the first gap material of said non-magnetic material between and having rear portions which are open-circuited by the first pattern material of said non-magnetic pattern material; the first rear core which magnetically couples rear portions of said first and second front cores and which constitutes the first magnetic circuit in conjunction with said first and second front cores; the third and fourth front cores (2b, 3) having front portions which confront each other with the second gap material of said non-magnetic material between and having rear portions which are open-circuited by the second pattern material of said non-magnetic pattern material; and the second rear core which magnetically couples rear portions of said third and fourth front cores and which constitutes the second magnetic circuit in conjunction with said third and fourth front cores, and wherein said windings comprise the first and second thin film coils (lla, Ilb), the first thin film coil surrounds the first joint portion where said first rear core is jointed to said first and second front cores and has linkage with said first joint portion, and the second thin film coil surrounds the second joint portion where said second rear core is jointed to said third and fourth front cores and has linkage with said second joint portion.
Claim 17
Dependent Claim
20 words
A thin film magnetic head (10) according to Claim 15, wherein the shape of said non-magnetic pattern material is trapezoidal.
Claim 18
Dependent Claim
48 words
A thin film magnetic head (10) according to Claim 15, wherein each of said first and second gap depth defining materials has a second boundary (12) which crosses said boundaries and which forms a gap depth. defining face nearly parallel to the front face of said head core.
Claim 19
Dependent Claim
26 words
A thin film magnetic head (10) according to Claim 15, wherein the length of said gap depth defining second boundary (12) does not exceed 100 µm.
Claim 20
Dependent Claim
43 words
A thin film magnetic head (10) according to Claim 1, further comprising a non-magnetic pattern material (8a) for preventing the magnetic thin film from peeling off, said non-magnetic pattern material being disposed outside said magnetic circuit so as to surround said magnetic cores.
Claim 21
Dependent Claim
22 words
A thin film magnetic head according to Claim 1, wherein said non-magnetic gap material (5) is made of Si 0 2 .
Claim 22
Dependent Claim
19 words
A thin film magnetic head according to Claim 1, wherein said non-magnetic pattern material (8) is made of Al.
Claim 23
Independent Claim
176 words
A method for manufacturing a thin film magnetic head comprising steps of: forming a non-magnetic pattern material (8) for defining the gap depth on a non-magnetic substrate (1); forming a magnetic thin film (2') over the entire surface of said non-magnetic substrate, excepting said gap depth defining non-magnetic pattern material; removing half of said magnetic thin film so as to expose the face on the gap line of said non-magnetic pattern material and forming a head gap face (4); forming a non-magnetic material (gap material) on said head gap face of said magnetic thin film as a head gap; forming another magnetic thin film (3) on the place of said non-magnetic substrate, wherefrom said half of said magnetic thin film has been removed, so as to cover said gap material and a face of said non-magnetic pattern material located on the gap line; forming a winding hole (6) through said non-magnetic pattern and said non-magnetic substrate; and applying cylindrical abrasion to a front face comprising said non-magnetic substrate, said magnetic thin film, and said gap material.
Claim 24
Independent Claim
176 words
A method for manufacturing a thin film magnetic head comprising steps of: forming a non-magnetic pattern material (8) for defining the gap depth on a non-magnetic substrate (1); forming a magnetic thin film (2') over the entire surface of said non-magnetic substrate, excepting said gap depth defining non-magnetic pattern material; removing half of said magnetic thin film so as to expose the face on the gap line of said non-magnetic pattern material and forming a head gap face (4); forming a non-magnetic material (gap material) on said head gap face of said magnetic thin film as a head gap; forming another magnetic thin film (3) on the place of said non-magnetic substrate, wherefrom said half of said magnetic thin film has been removed, so as to cover said gap material and a face of said non-magnetic pattern material located on the gap line; forming a winding hole (6) through said non-magnetic pattern and said non-magnetic substrate; and applying cylindrical abrasion to a front face comprising said non-magnetic substrate, said magnetic thin film, and said gap material.
Claim 25
Dependent Claim
20 words
A method for manufacturing a thin film magnetic head according to Claim 22, wherein said non-magnetic pattern material comprises aluminum.
Claim 26
Independent Claim
201 words
A method for manufacturing a thin film magnetic head comprising steps of: forming a non-magnetic pattern material (8) modeling a magnetic core (front core) in negative form on a non-magnetic substrate (1); forming a magnetic core (2') comprising a magnetic film into a concave portion resultant from said pattern material; forming a gap face (4) and an L-shaped magnetic core (2) by removing half of said magnetic core (2'); forming a gap material (5) on said gap face of said magnetic core and forming an I-shaped magnetic core (3) comprising a magnetic thin film into a space wherefrom said half of said magnetic core has been removed; forming a thin film spiral coil (11) on an insulating film so as to surround rear portions of said L-shaped and I-shaped magnetic cores (2, 3), said insulating film being disposed on upper surfaces of said non-magnetic pattern material and said L-shaped and I-shaped magnetic cores; forming a rear magnetic core (9) after forming another insulating film provided on said spiral coil, between the rear portion of said L-shaped magnetic core (2) and the rear portion of said I-shaped magnetic core (3); and applying cylindrical abrasion to a front face of said magnetic core.
Claim 27
Independent Claim
201 words
A method for manufacturing a thin film magnetic head comprising steps of: forming a non-magnetic pattern material (8) modeling a magnetic core (front core) in negative form on a non-magnetic substrate (1); forming a magnetic core (2') comprising a magnetic film into a concave portion resultant from said pattern material; forming a gap face (4) and an L-shaped magnetic core (2) by removing half of said magnetic core (2'); forming a gap material (5) on said gap face of said magnetic core and forming an I-shaped magnetic core (3) comprising a magnetic thin film into a space wherefrom said half of said magnetic core has been removed; forming a thin film spiral coil (11) on an insulating film so as to surround rear portions of said L-shaped and I-shaped magnetic cores (2, 3), said insulating film being disposed on upper surfaces of said non-magnetic pattern material and said L-shaped and I-shaped magnetic cores; forming a rear magnetic core (9) after forming another insulating film provided on said spiral coil, between the rear portion of said L-shaped magnetic core (2) and the rear portion of said I-shaped magnetic core (3); and applying cylindrical abrasion to a front face of said magnetic core.
Claim 28
Dependent Claim
20 words
A method for manufacturing a thin film magnetic head according to Claim 24, wherein said non-magnetic pattern material comprises aluminum.
References Cited (Backward Citations)
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