US3827083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head wherein an erasing head is perpendicular to a record-reproduce gap
Assignee: Canon Inc
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Filing: 1972-08-30
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Granted: 1974-07-30
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Expires: 1992-08-30
Abstract
Abstract A magnetic head comprises a magnetic record or magnetic recordreproduce head core for forming a magnetized track, and an erase head core secured to the magnetic record-reproduce head core for forming erased tracks along the upper and lower marginal edges of the recorded track formed by the magnetic record or recordreproduce head core. The magnetic record or magnetic recordreproduce head core has at least one effective gap. The erase head core has its erase head gaps formed by the outer edges adjacent said effective gap portion of said magnetic record or magnetic record-reproduce head core and chip members of magnetic anisotropy opposedly disposed through said magnetic record or magnetic record-reproduce core.
Inventors
- 👤 I Hosaka
- 👤 Y Yokota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:52
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/133; G11B5/265
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
173 words
A cross type magnetic head comprising: a magnetic record-reproduce head provided with one effective gap for forming a record-reproduce track on a recording medium and having a first core member provided with a record-reproduce coil wound therearound; and an erasing head provided with two erasing gaps each extending perpendicularly to said effective gap to limit said recordreproduce track at both sides thereof, and formed of said first core member, chip members of magnetic anisotropy and a second core member provided with an erasing coil wound therearound and in abutment with said chip member at least at a portion thereof, said chip members being so disposed adjacent both sides of said first core member that hard magnetizable directions thereof are substantially parallel to the respective abutting surface thereof to said erasing gaps; the ends of said first core member and said chip members being disposed to contact with a sliding surface of the recording medium, while the ends of said second core member being disposed away from the sliding surface of said recording medium.
Claim 2
Dependent Claim
173 words
A cross type magnetic head comprising: a magnetic record-reproduce head provided with one effective gap for forming a record-reproduce track on a recording medium and having a first core member provided with a record-reproduce coil wound therearound; and an erasing head provided with two erasing gaps each extending perpendicularly to said effective gap to limit said recordreproduce track at both sides thereof, and formed of said first core member, chip members of magnetic anisotropy and a second core member provided with an erasing coil wound therearound and in abutment with said chip member at least at a portion thereof, said chip members being so disposed adjacent both sides of said first core member that hard magnetizable directions thereof are substantially parallel to the respective abutting surface thereof to said erasing gaps; the ends of said first core member and said chip members being disposed to contact with a sliding surface of the recording medium, while the ends of said second core member being disposed away from the sliding surface of said recording medium.
Claim 3
Dependent Claim
29 words
A cross type magnetic head according to claim 1, wherein said chip members have respective easily magnetizable directions substantially perpendicular to the abutting surfaces thereof to said erasing gaps.
Claim 4
Dependent Claim
22 words
A cross type magnetic head according to claim 1, wherein single crystal ferrite is used as the material for said chip members.
Claim 5
Dependent Claim
22 words
A cross type magnetic head according to claim 1, wherein siNgle crystal sendust is used as the material for said chip members.
Claim 6
Dependent Claim
22 words
A cross type magnetic head according to claim 1, wherein single crystal ferroxplana is used as the material for said chip members.
Claim 7
Dependent Claim
192 words
A cross type magnetic head comprising: a magnetic record-reproduce head provided with one effective gap for forming a record-reproduce track on a recording medium and having a first core member provided with a record-reproduce coil wound therearound; and an erasing head provided with two erasing gaps each extending perpendicularly to said effective gap to limit said record-reproduce track at both sides thereof, and formed of said first core member, chip members of magnetic anisotropy and a second core member provided with an erasing coil wound therearound and cooperating with said first core member to support said chip member therebetween, said chip members being so disposed adjacent both sides of said first core member that hard magnetizable directions thereof are substantially parallel to the respective abutting surface thereof to said erasing gaps and that easily magnetizable directions thereof are substantially perpendicular to the respective abutting surface thereof to said erasing gaps; the ends of said first core member and said chip members being disposed to contact with a sliding surface of the recording medium, while the ends of said second core member being disposed away from the sliding surface of said recording medium.
Claim 8
Dependent Claim
192 words
A cross type magnetic head comprising: a magnetic record-reproduce head provided with one effective gap for forming a record-reproduce track on a recording medium and having a first core member provided with a record-reproduce coil wound therearound; and an erasing head provided with two erasing gaps each extending perpendicularly to said effective gap to limit said record-reproduce track at both sides thereof, and formed of said first core member, chip members of magnetic anisotropy and a second core member provided with an erasing coil wound therearound and cooperating with said first core member to support said chip member therebetween, said chip members being so disposed adjacent both sides of said first core member that hard magnetizable directions thereof are substantially parallel to the respective abutting surface thereof to said erasing gaps and that easily magnetizable directions thereof are substantially perpendicular to the respective abutting surface thereof to said erasing gaps; the ends of said first core member and said chip members being disposed to contact with a sliding surface of the recording medium, while the ends of said second core member being disposed away from the sliding surface of said recording medium.
Claim 9
Dependent Claim
201 words
A cross type magnetic head comprising: a magnetic record-reproduce head provided with one effective gap for forming a record-reproduce track on a recording medium and having a first core member provided with a record-reproduce coil wound therearound; and an erasing head provided with two erasing gaps each extending perpendicularly to said effective gap to limit said record-reproduce track at both sides thereof and formed of, said first core member, chip members of magnetic anisotropy which are so disposed adjacent both sides of said first core member that hard magnetizable directions thereof are substantially parallel to the respective abutting surface thereof to said erasing gaps and that easily magnetizable directions thereof are substantially perpendicular to the respective abutting surface thereof to said erasing gaps, and a second core member provided with an erasing coil wound therearound and supporting said first core member, the ends of said second core member being in abutment with the rear ends of said chip members; the ends of said first core member and said chip members being disposed to contact with a sliding surface of the recording medium, while the ends of said second core member being disposed away from the sliding surface of said recording medium.
Claim 10
Dependent Claim
201 words
A cross type magnetic head comprising: a magnetic record-reproduce head provided with one effective gap for forming a record-reproduce track on a recording medium and having a first core member provided with a record-reproduce coil wound therearound; and an erasing head provided with two erasing gaps each extending perpendicularly to said effective gap to limit said record-reproduce track at both sides thereof and formed of, said first core member, chip members of magnetic anisotropy which are so disposed adjacent both sides of said first core member that hard magnetizable directions thereof are substantially parallel to the respective abutting surface thereof to said erasing gaps and that easily magnetizable directions thereof are substantially perpendicular to the respective abutting surface thereof to said erasing gaps, and a second core member provided with an erasing coil wound therearound and supporting said first core member, the ends of said second core member being in abutment with the rear ends of said chip members; the ends of said first core member and said chip members being disposed to contact with a sliding surface of the recording medium, while the ends of said second core member being disposed away from the sliding surface of said recording 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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |