US4713710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact multiple magnetic head apparatus
Assignee: Sony Corp
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Filing: 1985-06-21
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Granted: 1987-12-15
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Expires: 2005-06-21
Abstract
Abstract The present invention is to construct a combination magnetic head apparatus in which thin film type magnetic head element portions, circuits and circuit parts accompanying therewith are mounted on first and second magnetic shield plates to thereby construct a recording head and a reproducing head and both the magnetic shield plates are bonded together at the back surfaces thereof with the result that the apparatus can be made small in size, the assembling thereof can be simplified and the accuracy thereof can be improved.
Inventors
- 👤 Yutaka Soda
- 👤 Hideko Imamura
- 👤 Hiroyuki Uchida
- 👤 Tetsuo Sekiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:32
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/265; G11B5/2651; G11B5/10; G11B5/11; G11B5/115; G11B5/187; G11B5/1871; G11B5/3103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 words
A combination magnetic head apparatus characterized in that a recording head portion in which on one surface of a first magnetic shield plate there are located a recording magnetic head element portion, a recording integrated circuit and a capacitor and a reproducing head portion in which on one surface of a second magnetic shield plate there are located a reproducing magnetic head element portion, a reproducing integrated circuit and a capacitor are bonded together on the other surfaces of said first and second magnetic shield plates and the overall arrangement thereof is incorporated into a shield case, wherein said recording magnetic head element portion includes a thin film magnetic head element formed on a magnetic substrate bonded to said first magnetic shield plate, a protective substrate is bonded thereto so as to cover the same, said reproducing magnetic head element portion includes a thin film magnetic head element formed on a substrate bonded to said second magnetic shield plate, a protective substrate is bonded thereto so as to cover the same, said recording head portion and said reproducing head portion are respectively provided with magnetic medium contact surfaces by cylindrical polishing around a polishing center displaced from an extension of the depth directions of the magnetic gaps.
Claim 2
Dependent Claim
207 words
A combination magnetic head apparatus characterized in that a recording head portion in which on one surface of a first magnetic shield plate there are located a recording magnetic head element portion, a recording integrated circuit and a capacitor and a reproducing head portion in which on one surface of a second magnetic shield plate there are located a reproducing magnetic head element portion, a reproducing integrated circuit and a capacitor are bonded together on the other surfaces of said first and second magnetic shield plates and the overall arrangement thereof is incorporated into a shield case, wherein said recording magnetic head element portion includes a thin film magnetic head element formed on a magnetic substrate bonded to said first magnetic shield plate, a protective substrate is bonded thereto so as to cover the same, said reproducing magnetic head element portion includes a thin film magnetic head element formed on a substrate bonded to said second magnetic shield plate, a protective substrate is bonded thereto so as to cover the same, said recording head portion and said reproducing head portion are respectively provided with magnetic medium contact surfaces by cylindrical polishing around a polishing center displaced from an extension of the depth directions of the magnetic gaps.
References Cited (Backward Citations)
GB1339091A
Cited
US4494160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |