US3744040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head construction
Assignee: NORTRONICS CO
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Filing: 1972-02-16
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Granted: 1973-07-03
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Expires: 1992-02-16
Abstract
Abstract A read-after-write magnetic head with closely spaced, parallel read and write gaps is disclosed. A magnetic circuit comprising a pair of core pieces is provided for each gap. A coil is mounted on the outer core piece of each pair and each outer core piece is held in a core piece holder which extends over substantially all of the outer core piece except for a core piece tip in order to reduce flux leakage between circuits. Both of the inner core pieces for each gap are held in place by a center core piece holder of unitary construction. Two shields are located within the center core piece holder and are shaped to cooperate with the magnetic head housing to complete flux paths surrounding each of the read and write portions of the head.
Inventors
- 👤 A Kronfeld
- 👤 A Honegger
- 👤 W Schrepfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
266 words
A magnetic head having closely spaced, parallel write and read gaps, comprising: a. first and second generally U-shaped separate and unconnected core pieces mounted in first and second core holders; b. a center core holder constructed from a single piece of nonmagnetic metal and having oppositely facing, parallel sides; c. first and second separate and unconnected center core pieces mounted in said center core holder sides, each center core piece abutting a corresponding U-shaped core piece to provide a read or write gap therebetween and to complete magnetic read and write circuits; d. read and write coils mounted on said U-shaped core pieces; e. means including a magnetic shield outer casing for holding said center core holder between and in contact with said first and second core holders; f. permeable center shield means mounted in slot means within said center core holder, said shield means being between and planar with said center core holder sides for reducing leakage flux between said read and write circuits; and g. said permeable center shield means including a first generally U-shaped shield mounted in a first slot in said slot means for cooperation with said outer casing in completing a flux circuit around said read circuit and a second oppositely facing generally U-shaped sHield mounted in a second slot in said slot means for cooperation with said outer casing in completing a flux circuit around said write circuit, said first and second shields having side portions thereof extending from each of said first and second slots in said slot means along said outer casing toward said center core holder sides.
Claim 2
Dependent Claim
266 words
A magnetic head having closely spaced, parallel write and read gaps, comprising: a. first and second generally U-shaped separate and unconnected core pieces mounted in first and second core holders; b. a center core holder constructed from a single piece of nonmagnetic metal and having oppositely facing, parallel sides; c. first and second separate and unconnected center core pieces mounted in said center core holder sides, each center core piece abutting a corresponding U-shaped core piece to provide a read or write gap therebetween and to complete magnetic read and write circuits; d. read and write coils mounted on said U-shaped core pieces; e. means including a magnetic shield outer casing for holding said center core holder between and in contact with said first and second core holders; f. permeable center shield means mounted in slot means within said center core holder, said shield means being between and planar with said center core holder sides for reducing leakage flux between said read and write circuits; and g. said permeable center shield means including a first generally U-shaped shield mounted in a first slot in said slot means for cooperation with said outer casing in completing a flux circuit around said read circuit and a second oppositely facing generally U-shaped sHield mounted in a second slot in said slot means for cooperation with said outer casing in completing a flux circuit around said write circuit, said first and second shields having side portions thereof extending from each of said first and second slots in said slot means along said outer casing toward said center core holder sides.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |