Patent US4403002A successfully refreshed from Google Patents.
US4403002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum evaporating apparatus
Assignee: Fujifilm Holdings Corp
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Filing: 1982-11-23
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Granted: 1983-09-06
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Expires: 2002-11-23
Abstract
Abstract A method and apparatus for vacuum evaporating magnetic material onto a base. Cylindrical cans are disposed parallel to one another and rotated either in the same or opposite directions. A tape-shaped base is wound around the cans passing from an upper vacuum chamber to a lower vacuum chamber. A vacuum evaporation source is positioned in the lower chamber and directed to the tape-shaped base in a predetermined area on both sides of a gap between the cans or a line contact area between the cans.
Inventors
- 👤 Goro Akashi
- 👤 Ryuji Shirahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:06
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/56; C23C14/562; G; G11; G11B; G11B5/00; G11B5/84; G11B5/851; H; H01; H01F; H01F41/00; H01F41/14; H01F41/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A method for vacuum evaporation onto a tape-shaped base comprising the steps of: providing at least two parallel cylindrical cans with a narrow gap between said cans to maintain a vacuum degree difference between upper and lower sides of the cans; providing a vacuum around said cans wherein a higher vacuum is provided below said cans than above said cans; rotating said cans in the same direction so as to transfer the tape-shaped base through said gap; and vacuum evaporating a vapor material into said gap and depositing it onto said tape-shaped base solely in a predetermined area on both sides of said gap as said tape-shaped base passes therethrough.
Claim 2
Independent Claim
110 words
A method for vacuum evaporation onto a tape-shaped base comprising the steps of: providing at least two parallel cylindrical cans with a narrow gap between said cans to maintain a vacuum degree difference between upper and lower sides of the cans; providing a vacuum around said cans wherein a higher vacuum is provided below said cans than above said cans; rotating said cans in the same direction so as to transfer the tape-shaped base through said gap; and vacuum evaporating a vapor material into said gap and depositing it onto said tape-shaped base solely in a predetermined area on both sides of said gap as said tape-shaped base passes therethrough.
Claim 3
Dependent Claim
29 words
The method of claim 1 further comprising the steps of providing at least one guide roller at a position above and between said cans for guiding said tape-shaped base.
Claim 4
Dependent Claim
28 words
The method of claim 1 further comprising the step of providing shielding means for preventing vapor material from reaching said tape-shaped base other than in said predetermined area.
Claim 5
Dependent Claim
36 words
The method of claim 1 wherein the step of vacuum evaporation comprises oblique evaporation by positioning masks relative to said cans to block vapor material from reaching said tape-shaped base other than in said predetermined area.
Claim 6
Dependent Claim
27 words
The method of claim 1 further comprising the step of depositing vapor material simultaneously on plural portions of said tape-shaped base as it passes through said gap.
Claim 7
Independent Claim
95 words
A method for vacuum evaporation onto a tape-shaped base comprising the steps of: providing at least two parallel cylindrical cans in contact with each other; providing a vacuum around said cans; rotating said cans in opposite directions so as to transfer said tape-shaped base through a contact area of said cans; vacuum evaporating a vapor material in said contact area and onto said tape-shaped base in a predetermined area on both sides of said contact area; and providing shielding means for preventing vapor material from reaching said tape-shaped base other than in said predetermined area.
Claim 8
Independent Claim
95 words
A method for vacuum evaporation onto a tape-shaped base comprising the steps of: providing at least two parallel cylindrical cans in contact with each other; providing a vacuum around said cans; rotating said cans in opposite directions so as to transfer said tape-shaped base through a contact area of said cans; vacuum evaporating a vapor material in said contact area and onto said tape-shaped base in a predetermined area on both sides of said contact area; and providing shielding means for preventing vapor material from reaching said tape-shaped base other than in said predetermined area.
Claim 9
Dependent Claim
18 words
The method of claim 6 wherein a higher vacuum is provided below said cans than above said cans.
Claim 10
Dependent Claim
29 words
The method of claim 6 further comprising the steps of providing at least one guide roller at a position above and between said cans for guiding said tape-shaped base.
Claim 11
Dependent Claim
29 words
The method of claim 6 wherein said contact area is a zone of line contact formed by disposing said two parallel cylindrical cans in line contact with each other.
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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |