Patent US4384968A successfully refreshed from Google Patents.
US4451501A
Expired / Lapsed
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Method of making a magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1982-04-15
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Granted: 1984-05-29
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Expires: 2002-04-15
Abstract
Abstract A magnetic metal deposition material contained in a hearth is heated and evaporated in a vacuum to form a flow of vapor, which is then ionized and converged toward a predetermined deposition surface of a flexible substrate. The flexible substrate is moved obliquely downwardly along a convex course by sliding contact with the curved surface a fixed curved guiding body between a pair of guide rollers located at different heights above the hearth. The fixed curved guiding body communicates with a coolant source for cooling the substrate moving in contact therewith and may be provided with oscillators. Thus a thin film of the magnetic metal is deposited on the convex surface of the substrate.
Inventors
- 👤 Makoto Nagao
- 👤 Akira Nahara
- 👤 Goro Akashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:42
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/56; C23C14/562; C23C14/24; G; G11; G11B; G11B5/00; G11B5/84; G11B5/851
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A method of making a magnetic recording medium comprising, in a vacuum, moving a flexible substrate obliquely downwardly along a convex course in sliding contact with a curved surface of a fixed curved, finely oscillating guiding means in such a manner that said flexible substrate intersects a flow of vapor obtained by heating and evaporating a magnetic metal deposition material, passing a coolant inside said fixed curved guiding means to cool said flexible substrate, thereby forming a thin film of said magnetic metal on the convex surface of said substrate.
Claim 2
Independent Claim
90 words
A method of making a magnetic recording medium comprising, in a vacuum, moving a flexible substrate obliquely downwardly along a convex course in sliding contact with a curved surface of a fixed curved, finely oscillating guiding means in such a manner that said flexible substrate intersects a flow of vapor obtained by heating and evaporating a magnetic metal deposition material, passing a coolant inside said fixed curved guiding means to cool said flexible substrate, thereby forming a thin film of said magnetic metal on the convex surface of said substrate.
Claim 3
Dependent Claim
19 words
A method as defined in claim 1 wherein said flow of vapor is ionized by an ionization enhancing means.
Claim 4
Dependent Claim
22 words
A method as defined in claim 2 wherein said flow of ionized vapor is then converged by an ion beam converging means.
Claim 5
Dependent Claim
19 words
A method as defined in claim 1 wherein said flexible substrate is moved by a pair of guide rollers.
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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |