US4501225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making a magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1984-03-15
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Granted: 1985-02-26
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Expires: 2004-03-15
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 of 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
2026-10-30 01:33
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: 9
Claim 1
Independent Claim
83 words
An apparatus for making a magnetic recording medium at least comprising, in a vacuum, a means for heating and evaporating a deposition material, a hearth for containing said deposition material, a pair of guide rollers located at different heights above said hearth, and a fixed curved guiding means having a curved surface which is convex downwardly and capable of slidably guiding a flexible substrate moved in contact therewith between said pair of guide rollers, said fixed curved guiding means being provided with oscillators.
Claim 2
Independent Claim
83 words
An apparatus for making a magnetic recording medium at least comprising, in a vacuum, a means for heating and evaporating a deposition material, a hearth for containing said deposition material, a pair of guide rollers located at different heights above said hearth, and a fixed curved guiding means having a curved surface which is convex downwardly and capable of slidably guiding a flexible substrate moved in contact therewith between said pair of guide rollers, said fixed curved guiding means being provided with oscillators.
Claim 3
Dependent Claim
24 words
An apparatus as defined in claim 1 wherein the inside of the body of said fixed curved guiding means communicates with a coolant source.
Claim 4
Dependent Claim
21 words
An apparatus as defined in claim 2 further comprising an ion beam converging means for converging the flow of ionized vapor.
Claim 5
Dependent Claim
25 words
An apparatus as defined in claim 1 wherein the curved surface of said fixed curved guiding means has a surface roughness of 25S or less.
Claim 6
Dependent Claim
23 words
An apparatus as defined in claim 1 wherein the curved surface of said fixed curved guiding means is covered with a lubricant layer.
Claim 7
Dependent Claim
23 words
An apparatus as defined in claim 1 further comprising an ionization enhancing means for ionizing the flow of vapor of said deposition material.
Claim 8
Independent Claim
102 words
An apparatus for making a magnetic recording medium at least comprising, in a vacuum, a means for heating and evaporating a deposition material, a hearth for containing said deposition material, a pair of guide rollers located at different heights above said hearth, and a fixed curved guiding means having a body with a curved surface which is convex downwardly and capable of slidably guiding a flexible substrate moved in contact therewith between said pair of guide rollers, the inside of said body of said fixed curved guiding means communicating with a coolant surface, said fixed curved guiding means being provided with oscillators.
Claim 9
Independent Claim
102 words
An apparatus for making a magnetic recording medium at least comprising, in a vacuum, a means for heating and evaporating a deposition material, a hearth for containing said deposition material, a pair of guide rollers located at different heights above said hearth, and a fixed curved guiding means having a body with a curved surface which is convex downwardly and capable of slidably guiding a flexible substrate moved in contact therewith between said pair of guide rollers, the inside of said body of said fixed curved guiding means communicating with a coolant surface, said fixed curved guiding means being provided with oscillators.
References Cited (Backward Citations)
US4220117A
Cited
JPS54125006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |