US4422106A
Expired / Lapsed
US
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Magnetic transcription-recording method
Assignee: Toshiba Corp
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Filing: 1980-07-01
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Granted: 1983-12-20
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Expires: 2000-07-01
Abstract
Abstract A magnetic transcription-recording method, in which the magnetic material layer (5) of a magnetic recording medium (4) is brought into contact with the magnetic material layer (2) of a master recording medium (1) having information signals such as audio signals or video signals recorded therein in a concave-convex pattern, and a magnetic field is applied to the master recording medium (1) and the magnetic recording medium (4) so as to transcribe and record magnetically the information signals in the magnetic material layer (5) of the magnetic recording medium (4), characterized in that the information signals are recorded at a high density in a concave-convex pattern in the magnetic material layer (2) of the master recording medium (1).
Inventors
- 👤 Norikazu Sawazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/86; G11B5/865; B; B82; B82Y; B82Y10/00; G11B5/74; G11B5/743
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
A magnetic transcription-recording method, in which a magnetic material layer of a magnetic recording mdium is brought into contact with the magnetic material layer of a master recording medium having information signals recorded therein in a pattern of projections, and a magnetic field is applied to the master recording medium and the magnetic recording medium so as to transcribe and record magnetically the information signals in the magnetic material layer of the magnetic recording medium, wherein said magnetic field includes an AC magnetic field and a DC magnetic field, said AC magnetic field is applied in a direction perpendicular to an oriented direction of said magnetic material layer of said magnetic recording medium, and said DC magnetic field is applied in said oriented direction.
Claim 2
Dependent Claim
124 words
A magnetic transcription-recording method, in which a magnetic material layer of a magnetic recording mdium is brought into contact with the magnetic material layer of a master recording medium having information signals recorded therein in a pattern of projections, and a magnetic field is applied to the master recording medium and the magnetic recording medium so as to transcribe and record magnetically the information signals in the magnetic material layer of the magnetic recording medium, wherein said magnetic field includes an AC magnetic field and a DC magnetic field, said AC magnetic field is applied in a direction perpendicular to an oriented direction of said magnetic material layer of said magnetic recording medium, and said DC magnetic field is applied in said oriented direction.
Claim 3
Dependent Claim
35 words
A magnetic transcription-recording method according to claim 1, wherein said magnetic material layer of said magnetic recording medium is oriented in the thickness direction, and said DC magnetic field is applied in the thickness direction.
Claim 4
Dependent Claim
35 words
A magnetic transcription-recording method according to claim 2, wherein said magnetic material layer of said magnetic recording medium is oriented in the thickness direction, and said DC magnetic field is applied in the thickness direction.
Claim 5
Dependent Claim
38 words
A magnetic transcription-recording method according to claim 2, wherein said magnetic material layer of said magnetic recording medium is uniformly magnetized in advance in the direction opposite to that achieved by the magnetization by the DC magnetic field.
Claim 6
Dependent Claim
46 words
A magnetic transcription-recording method according to claim 1, wherein said magnetic material layer of said magnetic recording medium is oriented in a direction perpendicular to the thickness direction, and said DC magnetic field is applied in said oriented direction of the last mentioned magnetic material layer.
Claim 7
Dependent Claim
35 words
A magnetic transcription-recording method according to claim 5, wherein said magnetic material layer of said magnetic recording medium is oriented in the thickness direction, and said DC magnetic field is applied in the thickness direction.
Claim 8
Dependent Claim
38 words
A magnetic transcription-recording method according to claim 5, wherein said magnetic material layer of said magnetic recording medium is uniformly magnetized in advance in the direction opposite to that achieved by the magnetization by the DC magnetic field.
Claim 9
Dependent Claim
37 words
A magnetic transcription-recording method according to claim 1, wherein said AC magnetic field is applied earlier to the master recording medium and magnetic recording medium, is gradually attenuated, and is extinguished earlier than the DC magnetic field.
Claim 10
Dependent Claim
38 words
A magnetic transcription-recording method according to claim 1, wherein said magnetic material layer of said magnetic recording medium is uniformly magnetized in advance in the direction opposite to that achieved by the magnetization by the DC magnetic field.
References Cited (Backward Citations)
US2894798A
Cited
US3554798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |