Patent US3859664A successfully refreshed from Google Patents.
US3859664A
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Batch fabricated thin-film transducers having a common pole with tunnel erase poles and a plurality of read/write poles
Assignee: Bull HN Information Systems Italia SpA
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Filing: 1973-07-09
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Granted: 1975-01-07
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Expires: 1993-07-09
Abstract
Abstract A plurality of thin film transducers are batch fabricated in two rows with a continuous pole which is common to both rows of transducers extending through all of the transducers. One row of transducers includes individual read/write poles which are mounted on one side of the common pole. The second row of transducers has a plurality of tunnel erase poles mounted on the other side of the common pole. Each adjacent pair of read/write transducers has a single common connection terminal or ''''shared terminal'''' mounted between them. The tunnel erase poles eliminate any signals which may be recorded in the space between the read/write transducers.
Inventors
- 👤 William R Chynoweth
- 👤 Wolfgang Kayser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:55
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/02; G11B5/027; G11B5/03; G11B5/29
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
306 words
A multitrack recording head having a plurality of transducers for use with a moveable magnetic medium, said recording head comprising: a substrate; a common magnetic pole; a plurality of magnetic read/write poles, said read/write poles being mounted in a row on said substrate with a space between each of said read/write poles, said common pole being mounted adjacent to each of said read/write poles, with each of said read/write poles being in a series magnetic relation with a portion of said common pole; a plurality of read/write conductors, each of said read/write conductors being inductively coupled to a portion of said common pole and to a corresponding one of said read/write poles, each of said read/write conductors being mounted between a portion of said common pole and the corresponding one of said read/write poles; a magnetic material, a portion of said material being connected between said common pole and a corresponding one of each of said read/write poles to form a plurality of read/write transducers each having a gap defined by said read/write conductor adjacent said magnetic medium; a plurality of erase poles, said erase poles being mounted in a row adjacent said common pole with said common pole between said row of erase poles and sAid row of read/write poles, said erase poles being spaced so that each portion of the magnetic medium which moves past the space between the read/write poles, moves past a corresponding one of said erase poles; an erase conductor, said erase conductor being mounted between said common pole and each of said erase poles; and a magnetic substance, a portion of said substance being connected between said common pole and a corresponding one of each of said erase poles to form a plurality of erase transducers each having a gap defined by said erase conductor adjacent to said magnetic medium.
Claim 2
Dependent Claim
306 words
A multitrack recording head having a plurality of transducers for use with a moveable magnetic medium, said recording head comprising: a substrate; a common magnetic pole; a plurality of magnetic read/write poles, said read/write poles being mounted in a row on said substrate with a space between each of said read/write poles, said common pole being mounted adjacent to each of said read/write poles, with each of said read/write poles being in a series magnetic relation with a portion of said common pole; a plurality of read/write conductors, each of said read/write conductors being inductively coupled to a portion of said common pole and to a corresponding one of said read/write poles, each of said read/write conductors being mounted between a portion of said common pole and the corresponding one of said read/write poles; a magnetic material, a portion of said material being connected between said common pole and a corresponding one of each of said read/write poles to form a plurality of read/write transducers each having a gap defined by said read/write conductor adjacent said magnetic medium; a plurality of erase poles, said erase poles being mounted in a row adjacent said common pole with said common pole between said row of erase poles and sAid row of read/write poles, said erase poles being spaced so that each portion of the magnetic medium which moves past the space between the read/write poles, moves past a corresponding one of said erase poles; an erase conductor, said erase conductor being mounted between said common pole and each of said erase poles; and a magnetic substance, a portion of said substance being connected between said common pole and a corresponding one of each of said erase poles to form a plurality of erase transducers each having a gap defined by said erase conductor adjacent to said magnetic medium.
Claim 3
Dependent Claim
38 words
A multitrack recording head as defined in claim 1 wherein: said read/write poles are mounted to record data in a plurality of tracks on said medium; and said erase poles are mounted to erase areas between said tracks.
Claim 4
Dependent Claim
103 words
A multitrack recording head as defined in claim 1 including: a plurality of connection terminals, a first of said connection terminals being connected to a first end of a first of said read/write conductors, a second end of said first read/write conductor and a first end of a second read/write conductor being connected to a second of said connection terminals, a second end of said second read/write conductor and a first end of a third read/write conductor being connected to a third of said connection terminals, a fourth of said connection terminals being connected to a second end of said third read/write conductor.
Claim 5
Dependent Claim
42 words
A multitrack recording head as defined in claim 1 wherein: said erase conductor is formed to be adjacent said medium in the area adjacent to said erase poles and said erase conductor is spaced away from said medium between said erase poles.
Claim 6
Dependent Claim
318 words
A multitrack recording head having a plurality of transducers for use with a movable magnetic medium, said recording head comprising: a substrate; a common magnetic pole; a plurality of magnetic read/write poles, said read/write poles being mounted in a row on said substrate with a space between each of said read/write poles, said common pole being mounted adjacent to each of said read/write poles, with each of said read/write poles being in a series magnetic relation with a portion of said common pole; a plurality of read/write conductors, each of said read/write conductors being inductively coupled to a portion of said common pole and to a corresponding one of said read/write poles, each of said read/write conductors being mounted between a portion of said common pole and the corresponding one of said read/write poles; a magnetic material, a portion of said material being connected between said common pole and a corresponding one of each of said read/write poles to form a plurality of read/write transducers each having a front gap defined by said read/write conductor adjacent said magnetic medium and having a back gap spaced away from said magnetic medium; a plurality of erase poles, said erase poles being mounted in a row adjacent said common pole with said common pole betweem said row of erase poles and said row of read/write poles, said erase poles being spaced so that each portion of the magnetic medium which moves past the space between the read/write poles, moves past a corresponding one of said erase poles; an erase conductor, said erase conductor being mounted between said common pole and each of said erase poles; and a magnetic substance, a portion of said substance being connected between said common pole and a corresponding one of each of said erase poles to form a plurality of erase transducers each having a gap defined by said erase conductor adjacent to said magnetic medium.
Claim 7
Dependent Claim
318 words
A multitrack recording head having a plurality of transducers for use with a movable magnetic medium, said recording head comprising: a substrate; a common magnetic pole; a plurality of magnetic read/write poles, said read/write poles being mounted in a row on said substrate with a space between each of said read/write poles, said common pole being mounted adjacent to each of said read/write poles, with each of said read/write poles being in a series magnetic relation with a portion of said common pole; a plurality of read/write conductors, each of said read/write conductors being inductively coupled to a portion of said common pole and to a corresponding one of said read/write poles, each of said read/write conductors being mounted between a portion of said common pole and the corresponding one of said read/write poles; a magnetic material, a portion of said material being connected between said common pole and a corresponding one of each of said read/write poles to form a plurality of read/write transducers each having a front gap defined by said read/write conductor adjacent said magnetic medium and having a back gap spaced away from said magnetic medium; a plurality of erase poles, said erase poles being mounted in a row adjacent said common pole with said common pole betweem said row of erase poles and said row of read/write poles, said erase poles being spaced so that each portion of the magnetic medium which moves past the space between the read/write poles, moves past a corresponding one of said erase poles; an erase conductor, said erase conductor being mounted between said common pole and each of said erase poles; and a magnetic substance, a portion of said substance being connected between said common pole and a corresponding one of each of said erase poles to form a plurality of erase transducers each having a gap defined by said erase conductor adjacent to said magnetic medium.
Claim 8
Dependent Claim
55 words
A multitrack recording head as defined in claim 5 wherein: said magnetic substance between said common pole and each of said erase poles forms a plurality of erase transducers each having a front gap defined by said erase conductor adjacent to said magnetic medium and having a back gap spaced away from said magnetic medium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |