Patent US4622271A successfully refreshed from Google Patents.
US4622271A
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US
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Magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1985-04-19
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Granted: 1986-11-11
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Expires: 2005-04-19
Abstract
Abstract A magnetic recording medium is described, comprising a support having provided thereon a thin magnetic metal vapor deposition film, said film being provided by evaporating a magnetic metal material from an evaporation source to generate a vapor flow and directing the vapor flow to contact a moving support at an inclined angle, and having a curved and inclined column structure formed by continuously altering the incident angle of said vapor flow on the moving support from a high degree (θ max ) to a low degree (θ min ), and a non-magnetic metal vapor deposition film provided on the magnetic metal film, said non-magnetic metal film being provided by continuously altering the incident angle of vapor flow of the non-magnetic metal material to the moving support on which the magnetic metal film is formed between a high degree (θ max' ) and a low degree (θ min' ).
Inventors
- 👤 Yoshihiro Arai
- 👤 Ryuji Shirahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:32
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/225; C23C14/226; G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/72; G11B5/84; G11B5/85; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/1291; Y10T428/12917; Y10T428/12944; Y10T428/12951; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
146 words
A magnetic recording medium comprising a support having provided thereon a thin magnetic metal vapor deposition film, said film being provided by evaporating a magnetic metal material from an evaporation source to generate a vapor flow and directing the vapor flow to contact a moving support at an inclined angle, and having a curved and inclined column structure formed by continuously altering the incident angle of said vapor flow on the moving support from a high degree (θ max ) to a low degree (θ min ), and a non-magnetic metal vapor deposition film provided on the magnetic metal film, said non-magnetic metal film being provided by continuously altering the incident angle of vapor flow of the non-magnetic metal material to the moving support on which the magnetic metal film is formed between a high degree (θ max' ) and a low degree (θ min' ).
Claim 2
Dependent Claim
146 words
A magnetic recording medium comprising a support having provided thereon a thin magnetic metal vapor deposition film, said film being provided by evaporating a magnetic metal material from an evaporation source to generate a vapor flow and directing the vapor flow to contact a moving support at an inclined angle, and having a curved and inclined column structure formed by continuously altering the incident angle of said vapor flow on the moving support from a high degree (θ max ) to a low degree (θ min ), and a non-magnetic metal vapor deposition film provided on the magnetic metal film, said non-magnetic metal film being provided by continuously altering the incident angle of vapor flow of the non-magnetic metal material to the moving support on which the magnetic metal film is formed between a high degree (θ max' ) and a low degree (θ min' ).
Claim 3
Dependent Claim
31 words
A magnetic recording medium as in claim 1, wherein the incident angle of vapor flow forming the non-magnetic metal film is continuously altered from a low degree to a high degree.
Claim 4
Dependent Claim
31 words
A magnetic recording medium as in claim 1, wherein the incident angle of vapor flow forming the non-magnetic metal film is continuously altered from a high degree to a low degree.
Claim 5
Dependent Claim
24 words
A magnetic recording medium as in claim 1, wherein the non-magnetic metal material comprises at least one of Cr, Ti, Sn, Cu and Al.
Claim 6
Dependent Claim
25 words
A magnetic recording medium as in claim 1, wherein the incident angle of vapor flow of the non-magnetic metal material is from 25° to 90°.
Claim 7
Dependent Claim
42 words
A magnetic recording medium as in claim 1, wherein the maximum incident angles (θ max and θ max' ) are each from 50° to 90°, and the minimum incident angles (θ min and θ min' ) are each from 25° to 70°.
Claim 8
Dependent Claim
42 words
A magnetic recording medium as in claim 2, wherein the maximum incident angles (θ max and θ max' ) are each from 50° to 90°, and the minimum incident angles (θ min and θ min' ) are each from 25° to 75°.
Claim 9
Dependent Claim
42 words
A magnetic recording medium as in claim 3, wherein the maximum incident angles (θ max and θ max' ) are each from 50° to 90°, and the minimum incident angles (θ min and θ min' ) are each from 25° to 75°.
Claim 10
Dependent Claim
42 words
A magnetic recording medium as in claim 4, wherein the maximum incident angles (θ max and θ max' ) are each from 50° to 90°, and the minimum incident angles (θ min and θ min' ) are each from 25° to 75°.
Claim 11
Dependent Claim
42 words
A magnetic recording medium as in claim 1, wherein the thickness of the magnetic metal vapor deposition film is from 0.05 μm to 2.0 μm, and the thickness of the non-magnetic metal vapor deposition film is from 0.005 μm to 0.02 μm.
Claim 12
Dependent Claim
42 words
A magnetic recording medium as in claim 2, wherein the thickness of the magnetic metal vapor deposition film is from 0.05 μm to 2.0 μm, and the thickness of the non-magnetic metal vapor deposition film is from 0.005 μm to 0.02 μm.
Claim 13
Dependent Claim
42 words
A magnetic recording medium as in claim 3, wherein the thickness of the magnetic metal vapor deposition film is from 0.05 μm to 2.0 μm, and the thickness of the non-magnetic metal vapor deposition film is from 0.005 μm to 0.02 μm.
Claim 14
Dependent Claim
42 words
A magnetic recording medium as in claim 4, wherein the thickness of the magnetic metal vapor deposition film is from 0.05 μm to 2.0 μm, and the thickness of the non-magnetic metal vapor deposition film is from 0.005 μm to 0.02 μm.
Claim 15
Dependent Claim
42 words
A magnetic recording medium as in claim 5, wherein the thickness of the magnetic metal vapor deposition film is from 0.05 μm to 2.0 μm, and the thickness of the non-magnetic metal vapor deposition film is from 0.005 μm to 0.02 μm.
Claim 16
Dependent Claim
42 words
A magnetic recording medium as in claim 6, wherein the thickness of the magnetic metal vapor deposition film is from 0.05 μm to 2.0 μm, and the thickness of the non-magnetic metal vapor deposition film is from 0.005 μm to 0.02 μm.
Claim 17
Dependent Claim
42 words
A magnetic recording medium as in claim 7, wherein the thickness of the magnetic metal vapor deposition film is from 0.05 μm to 2.0 μm, and the thickness of the non-magnetic metal vapor deposition film is from 0.005 μm to 0.02 μm.
Claim 18
Dependent Claim
42 words
A magnetic recording medium as in claim 8, wherein the thickness of the magnetic metal vapor deposition film is from 0.05 μm to 2.0 μm, and the thickness of the non-magnetic metal vapor deposition film is from 0.005 μm to 0.02 μm.
Claim 19
Dependent Claim
24 words
A magnetic recording medium as in claim 2, wherein the non-magnetic metal material comprises at least one of Cr, Ti, Sn, Cu and Al.
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) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |