US4967299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin-film magnetic head with a plurality of transducers
Assignee: Hitachi Ltd
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Filing: 1988-06-23
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Granted: 1990-10-30
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Expires: 2008-06-23
Abstract
Abstract A thin-film magnetic head has a first ferrite block on which a plurality of transducing elements are aligned on a predetermined surface, and a second ferrite block bonded to the first ferrite block, and has multi-track capabilities in accordance with the transducing elements. Eithr bonding surface of the first and second ferrite block is formed with an insulating film layer, the entire bonding surface is coated with an adhesive or formed with a plurality of recesses to be externally filled with the adhesive, and the adhesive is filled in gaps defined by the recesses and the surface of the opposed ferrite block. Thus, since the bonding portions of the first and second ferrite blocks are distributed over a wide region, the bonding strength can be largely increased, the transducing gap lengths are uniformly maintained, and the transducing element characteristic is not affected by the aging of the adhesive thereby improving the reliability of the magnetic head.
Inventors
- 👤 Takahiro Katoh
- 👤 Tooru Takeura
- 👤 Masayoshi Waki
- 👤 Yoshiki Hagiwara
- 👤 Kazuyoshi Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:35
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/31; G11B5/3163; G11B5/3103
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
A thin-film magnetic head having multi-track capability comprising: a first ferrite block including a plurality of transducing elements formed atop a predetermined surface thereof; and a second ferrite block, to be bonded to the predetermined surface of the first ferrite block; wherein either bonding surface of the first and second ferrite blocks includes an insulating film layer, and wherein a plurality of recesses, to be coated or externally fed with an adhesive, are formed on any entire bonding surface of the first and second ferrite blocks in such a manner that the adhesive is filled in gaps which are formed by the recesses and an opposing ferrite block surface.
Claim 2
Dependent Claim
109 words
A thin-film magnetic head having multi-track capability comprising: a first ferrite block including a plurality of transducing elements formed atop a predetermined surface thereof; and a second ferrite block, to be bonded to the predetermined surface of the first ferrite block; wherein either bonding surface of the first and second ferrite blocks includes an insulating film layer, and wherein a plurality of recesses, to be coated or externally fed with an adhesive, are formed on any entire bonding surface of the first and second ferrite blocks in such a manner that the adhesive is filled in gaps which are formed by the recesses and an opposing ferrite block surface.
Claim 3
Dependent Claim
26 words
The thin-film magnetic head as claimed in claim 1, wherein said plurality of recesses are formed in a shape relative to that of said transducing elements.
Claim 4
Dependent Claim
79 words
The thin-film magnetic head as claimed in claim 2, wherein said plurality of transducing elements are deposited on the surface of said first ferrite block, said insulating film layer is so deposited as to cover said plurality of transducing elements, said plurality of recesses being indispensably formed in the insulating film in response to the shapes of said plurality of transducing elements, and the adhesive is filled in said gaps defined by said recesses and said second ferrite block.
Claim 5
Dependent Claim
44 words
The thin-film magnetic head as claimed in claim 3, wherein a plurality of other recesses are disposed adjacent to said ones of aid plurality of recesses, and are formed on the right and left regions extended in the aligning direction of said transducing elements.
Claim 6
Dependent Claim
67 words
The thin-film magnetic head as claimed in claim 2, wherein said insulating film layer is formed on the surface of said first ferrite block, said plurality of transducing elements are deposited in a plurality of grooves formed on said insulating film layer, and said gaps are defined by ones of said plurality of recesses associated with said transducing elements and the surface of said second ferrite block.
Claim 7
Dependent Claim
54 words
The thin-film magnetic head as claimed in claim 5, wherein a plurality of other recesses are disposed adjacent to the ones of said plurality of recesses defined by said plurality of transducing elements on said first ferrite block, being formed on right and left regions extended in an aligning direction of said transducing elements.
Claim 8
Dependent Claim
35 words
The thin-film magnetic head as claimed in claim 6, wherein said plurality of other recesses are formed substantially the same as said ones of said plurality of recesses defined by said plurality of transducing elements.
Claim 9
Dependent Claim
47 words
The thin-film magnetic head as claimed in any of claims 1 to 7, wherein a depth of each of said plurality of recesses is determined in accordance with a viscosity of the adhesive so that the adhesive can flow in the plurality of recesses by capillary action.
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) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |